Our Beautiful Universe - Photos and Videos

AI Thread Summary
The discussion focuses on sharing the beauty of the Universe through photos, videos, and animations, emphasizing the aesthetic appeal of space alongside scientific information. Participants are encouraged to post clips and images that comply with mainstream scientific guidelines, avoiding fringe theories. Notable contributions include time-lapse videos from the ISS and clips related to NASA missions, such as the Dawn and New Horizons projects. The thread also highlights the emotional impact of experiencing the vastness of space through visual media. Overall, it celebrates the intersection of art and science in showcasing the wonders of the Universe.
  • #1,501
Flame Nebula (NGC 2024):

Flame_620x620.jpg


This one is noisier than the last one mostly because I only did 10 minutes of exposures (10x1min) instead of an hour, and also it's a much dimmer nebula than the last one so I was shooting 1 minute exposures instead of 30 seconds, and I was shooting at 4x the ISO sensitivity... 6400iso instead of 1600iso and I was shooting from a light polluted area (moonless bortle 6) - the other one was shot from the same location. This was on a 2180mm focal f/14.5 telescope as was the other.

view in WorldWideTelescope

4258184.png


4258184-1.png


4258184-2.png


5973724.jpeg


5973724-1.jpeg
 
Last edited:
  • Like
Likes DennisN and collinsmark
Astronomy news on Phys.org
  • #1,502
Is anybody shooting the comet C2021/A1 (Leonard)? It has entered telescope magnitude range and is performing better than estimates.

My skies are completely cursed, was waiting for this one since a long time :headbang:
 
  • #1,503
DennisN said:
It's been cloudy here for weeks now, and I was tired of seeing the grey skies.

Finally I had a breakthrough...

A detail of Grey's Nebula (NGC #808080) in the constellation Greyhound. Since the amount of noise was so low there was no need to stack images. And the color reproduction is natural, no edits have been done.

Detail of Grey's Nebula (NGC #808080) (ISO 200, 1/160s exposure)
01 - Grey Clouds.jpg


The gear and the sky:
02 - Grey Gear.jpg
 
Last edited:
  • Haha
  • Like
Likes collinsmark, berkeman, Keith_McClary and 2 others
  • #1,504
DennisN said:
Finally I had a breakthrough...
Well done. Seems like a reflection nebula, hard to conclude from spectroscopy. I read somewhere that experts have theorized that the major constituents could be molecular Nitrogen, Oxygen and water vapor.
 
  • #1,505
:smile:o_O:woot:
 
  • #1,506
818C0FA7-AD74-4612-A07D-317EBA45F529.jpeg
 
  • #1,508
ClearOutside.com is my go-to for astro-forecasts. Works like a charm. Green means it's a "go" for astrophotography. It also shows whether the moon is up at a glance (which for me is to be avoided for deep-sky astrophotography), gives the bortle rating, and if you click on the days it shows a whole host of other info like winds, temperatures, ISS flyovers, and warns you if you'll be risking dew formation if the outside temperature will be very close to the dew point (which I ignored once and my cameras were soaking at the end of the night-- I was wiping down the lenses every 20 minutes).
 
Last edited:
  • Like
  • Informative
Likes DennisN and collinsmark
  • #1,509
Wind gusts are predicted to be 18mph tonight with 10mph sustained so it's a no-go despite the clear conditions... but I did manage to test my scope this afternoon on some Eagles in lieu of the Eagle Nebula as the sun was going down...

C72A30DD-4F5E-4052-B413-816465D4290D.jpeg
 
Last edited:
  • Wow
  • Love
Likes DennisN, Keith_McClary and collinsmark
  • #1,510
Summer milky way over the scouts camp in Czechia.

Sony A7 + Samyang 18/2.8 + Sky Watcher Star Adventurer
Foreground: panorama from 5 images, every is median form 3 photos
Sky: Panorama from 4 photos
Software: Photoshop, PixInsight, PTGui

My website: www.ondrejbruha.com
Tábor 2 (1).jpg
 
  • Like
Likes Keith_McClary, Devin-M, DennisN and 2 others
  • #1,511
Devin-M said:
ClearOutside.com is my go-to for astro-forecasts. Works like a charm. Green means it's a "go" for astrophotography. It also shows whether the moon is up at a glance (which for me is to be avoided for deep-sky astrophotography), gives the bortle rating, and if you click on the days it shows a whole host of other info like winds, temperatures, ISS flyovers, and warns you if you'll be risking dew formation if the outside temperature will be very close to the dew point (which I ignored once and my cameras were soaking at the end of the night-- I was wiping down the lenses every 20 minutes).
I hear you.

There's an amazing number of things which have an influence, which I wasn't aware of until I started myself (e.g. weather, light pollution, the Moon (presence and phase), wind, temperature).

Recently I have planned some new potential good sites near me, where I can at best get down to Bortle 3.

And there are two interesting Bortle 2 sites reasonably near me, the two Danish islands Mön and Bornholm.

I find Mön particularly interesting since it's very sparsely populated, and I can reach it without taking any ship. There's also supposed to be very nice nature scenery there, e.g. Möns Klint. I am thinking about maybe going camping there for a week or two next spring or summer, and drive around the small island to take nature photos in the day, and doing astrophotography in the night. All depending on the weather, of course. :smile:
 
  • Like
Likes Devin-M and collinsmark
  • #1,512
Wave interference effects on star light after passing between the slits of a bahtinov focusing mask...

IMG-8283_bahtinov_crop_620x620.jpg


IMG-8283_bahtinov_full_spike_620x620.jpg

271514BE-CDF0-48D3-88E2-C6F4F3DCED19.jpeg
 
  • Like
Likes DennisN and collinsmark
  • #1,513
I took this picture last night of "Casper the Friendly Ghost Nebula" also known as Messier 78 in moonless bortle 2 conditions near Shingletown, California, USA. It's a reflection nebula with a radius of about 5 light years and a distance of about 1350 light years from Earth in the constellation of Orion.

This noisy image is a result of under-exposure (both of the individual frames and the overall total exposure time of all the frames combined) and overzealous histogram stretching (twice) in Adobe Lightroom. The individual frames were 90 seconds long and I ended up with about 40 of them (I think only about 26 were good enough to stack) or about 1 hour exposure total on a 2180mm f/14.5 scope (Meade LX85 M6 1800mm f/12 Maksutov Cassegrain) at 6400iso with a Nikon D800 DSLR at prime focus & Star Adventurer 2i Pro tracker.

view in WorldWideTelescope

Casper_M78_620x620_double_stretched.jpg


4267934.png


4267934-1.png


4267934-2.png


5985929-1.jpeg


5985929.jpeg


76A97E85-5772-49A6-BCB4-A2BE32C5EE02.jpeg


795AA8B3-BF04-4F61-A4C3-FE8E67D6CD3C.jpeg
 
Last edited:
  • Like
Likes DennisN, Keith_McClary and collinsmark
  • #1,515
Keith_McClary said:
Is there any place that analyses this data over time so we could look up which locations have how many hours of good conditions per year?
I don't know of any. That would be nice though.

Maybe one alternative method is to look up where the nearest big observatory is. There's a good chance that if somebody put a big observatory there, they probably researched the viability of the location.

Better yet, find a contact a local astronomy club. There's a good chance they might even have unique access to darker sky locations. For example, here in San Diego there's the SDAA that has access to a location out in the desert, well away from the marine layer, in the middle of nowhere, where the sky is dark and the weather is usually favorable. (I've never been out there yet due to laziness, but it's there.)
 
  • Like
  • Informative
Likes Keith_McClary, PhysicoRaj and DennisN
  • #1,516
Keith_McClary said:
Is there any place that analyses this data over time so we could look up which locations have how many hours of good conditions per year?
I found this (Sunniest Cities in the World):

https://assets3.thrillist.com/v1/image/2832143

Top 3 areas are Arizona, Egypt and Chile…

There’s also this map of Europe and the US…

OrJunPB.png
 
Last edited:
  • Informative
  • Like
Likes Keith_McClary, collinsmark and DennisN
  • #1,517
The Phantom Galaxy (M74) in the constellation Pisces. The galaxy is about 32 million light years away. Imaged from my back patio. Total integration time: 59.78 hours. Bortle Class 7 skies (maybe 8).

Phantom2021FinalSmall.jpg

Figure 1. Phantom Galaxy (Messier 74)

I started the first night of imaging by warming up some fish tacos in the back of the fridge that were about to go bad. I also cooked up a batch of off-brand fishsticks to go with the half-empty bottle of tarter sauce that's been in the fridge since the before times. This will become important later.

The Phantom Galaxy (M74) is arguably called the "phantom" because it is perhaps the most difficult of the Messier objects for amateur astronomers to observe, due to its low surface brightness.

A few hours into the first night of imaging, my gastrointestinal system started making all sorts of noises. There were high pitched screeches, baritone groans, and even some falsetto squawks. It was like an opera going on in there!

Equipment:
Meade 10" LX200-ACF on a equatorial wedge
Optec Lepus 0.62x focal reducer
Astronomik RGB filters
Astronomik Ha filter
Optolong L-Pro filter
ZWO ASI1600MM-COOL monochrome camera

Software:
Nighttime Imaging 'N' Astronomy (N.I.N.A.)
PixInsight
Topaz Labs Denoise AI
GNU Image Manipulation Program (GIMP)

Before the first night was over, my digestive tract released several gaseous, ethereal, fish taco phantoms into the realm of the living. Although mostly invisible, they made their presence known and continued to linger around for what seemed like forever.

With the Phantom Galaxy's (M74's) low surface brightness, it took about 13 clearish nights to get this image. You might think that with nearly 60 hours of integration time, that it would turn out better. But keep in mind that I'm imaging from Bortle Class 7 (maybe 8) skies, and that's not even counting the neighborhood glare, of which there's plenty.

Here is an image of the telescope struggling with the Phantom Galaxy (M74). That glow in the sky isn't twilight: this snapshot was taken around 10 PM (22:00), roughly.

PXL_20211111_054352364.NIGHT.jpg

Figure 2. Telescope struggling with all the light pollution

The "Little Phantoms," as I came to call them, continued to hang around as the nights passed. They would float around and play games and curiously inspect the telescope. Inquisitive little things, they were. I think by the end, they quite interested in astronomy, and even offered to help out, in whatever strange way they could.

Integration:
L-Pro: 28.85 hours
R: 7.46 hours
G: 8.55 hours
B: 5.78 hours
Ha: 9.15 hours
Total: 59.78 hours

By the end of the imaging, I encouraged the Little Phantoms go out into the world on their own. They grow up so fast! They were reluctant at first. Then I put in a Star Wars movie, Episode I (the one where Anakin was a kid), and that seemed to convince them. We agreed that they are always welcome to come back to visit anytime in future seasons, particularly when the Phantom Galaxy (M74) is revisited. And we'll always have the fish tacos.
 
Last edited:
  • Like
  • Haha
Likes Andy Resnick, DennisN and Devin-M
  • #1,518
Stunning results! I love how you captured the very faint outer regions and the red h-alpha regions. Great work.

Edit: It's funny you posted this today as I had started to consider asking how you were coming along with this project...
 
  • Like
Likes collinsmark
  • #1,519
I see what appears to be quite a few background galaxies / extended objects in there as well... it looks like about 4 of them in the upper right corner, one to the left of the bright star on the bottom right corner, one at the bottom in the center, and possibly another one on the far left side below the top left corner.
 
  • Like
Likes collinsmark
  • #1,520
collinsmark said:
Before the first night was over, my digestive tract released several gaseous, ethereal, fish taco phantoms into the realm of the living.
So it wasn't only light pollution you were fighting against. :smile:
 
  • Like
Likes collinsmark
  • #1,521
This is a single 10 minute exposure at 3200iso with no filters of the Wizard Nebula also known as NGC 7380 in Bortle 2 conditions... I shot this while waiting for Messier 78 to come above the horizon the other night, which was my primary target. Of the 12 or so 10 minute exposures I got this was the only one that came out with anything close to round stars, so I'm definitely butting up against the inherent limits of using a relatively cheap star tracker like the Star Adventurer 2i Pro... it's definitely not intended for 10 minute un-guided exposures at 2180mm focal length, so this picture is not very great but still not quite worthy of the trash-heap... I actually should have had the Ha filter inserted and this probably would have let me then composite just the nebulosity with some much shorter 30 second exposures I had gotten just for the RGB of the stars, but since I didn't put in the filter there's no way I can separate the nebulosity from the over-exposed stars in this picture and do a composite. In hindsight I should have recognized how badly these 10 minute exposures were coming out and cut my losses and swiveled to M78 much sooner and then I would have gotten a couple extra hours on that target which probably would have resulted in much less noise. After assessing these photos I think If I'm shooting straight RGB with no filters of a typical nebula in bortle 2 conditions, then 2 minutes per exposure at 6400iso seems like it may be the sweet spot when considering the weaknesses of the tracker on longer exposures, and the amount of noise to signal I get at 6400iso f/14.5.

view in WorldWideTelescope

IMG-8341-2.jpg


4274015.png


4274015-1.png


4274015-2.png


collinsmark said:
The "Little Phantoms," as I came to call them, continued to hang around as the nights passed. They would float around and play games and curiously inspect the telescope. Inquisitive little things, they were. I think by the end, they quite interested in astronomy, and even offered to help out, in whatever strange way they could.
I get something similar when I image in the driveway, but instead of "Little Phantoms" they carry the ignominious title of "Dumpster Kittens..."

255B00B3-BE5F-4D94-8C7C-2061691D1C39.jpeg
 
Last edited:
  • Like
  • Love
Likes collinsmark and DennisN
  • #1,523
jupiter_final_800x620.jpg
 
  • Like
  • Wow
Likes Borg, DennisN and collinsmark
  • #1,524
:smile: :thumbup:
 
  • #1,526
Phantom Galaxy (M74), reprocessed. It's from the same data as my last post (post #1517), but with a little bit of improved PixInisight-fu.

Phantom2021ReprocessedFinal.jpg
 
  • Like
  • Love
Likes chemisttree, davenn, Keith_McClary and 2 others
  • #1,527
:thumbup: :smile:
 
  • #1,528
Finally got a break in the clouds- it's been over a month- so I made sure to maximize my imaging time, sleep be damned :)

Finishing up NGC 891 for the year: 800/8.0 lens, DX format, 4.8 hours @ ISO 64:

NGC_891-St-17580s-1.jpg


The fainter galaxies are starting to clearly appear- some structure is now visible (1:1 crop):

NGC_891-St-17580s-2.jpg


As NGC moves out of view, the Pleiades are rising- 800/8.0, FX format, only 3 hours (so far) @ ISO 64:

800mm_Pleiades-St-11368s-1.jpg


It's not obvious on the downscaled image, but stopping down the lens also produces great 'starburst' patterns:

1639581482099.png


And then Orion is ascending: 800/8.0, FX-ish format, 1 hour @ ISO 64:
800mm_Orion-St-3314s-1.jpg


The image is a little stretched because I wanted to also image NGC 1999, just visible at the bottom left (here, 1:1):

800mm_Orion-St-3314s-3.jpg


Meanwhile, I can still keep the Trapezium from blooming:

800mm_Orion-St-3314s-2.jpg


Last, a blast from the past- I found an ISS flyover time-lapse I took on 4/2/20, right as we went into lockdown; I had other matters on my mind at the time and forgot I even took this:



This was taken at 800/5.6, 1/2000 s shutter speed and ISO 640 (I think). When I image the Space Station, I begin by consulting this site and find out what the maximum magnitude will be. Then, once I get set up, I set the camera ISO according to a star that's about the same magnitude- the shutter speed must be fast to reduce motion blur, I've found 1/2000s works.
 
  • Like
  • Love
  • Wow
Likes TSny, pinball1970, chemisttree and 6 others
  • #1,529
:thumbup: :thumbup: :smile:
 
  • #1,530
Hi, watching your Pleiades, I remember my Pleidases attempt by CCD eyepiece camera with Newton 1000/200 mm. I attach both as illustration of zoom field difference. (on your image is marked cca my zoom view. o_O o_O :wideeyed:
 

Attachments

  • pleiades mark.jpg
    pleiades mark.jpg
    44.3 KB · Views: 104
  • Pleiady.jpg
    Pleiady.jpg
    2.9 KB · Views: 107
  • Like
Likes pinball1970 and DennisN
  • #1,531
Andy Resnick said:
This was taken at 800/5.6, 1/2000 s shutter speed and ISO 640 (I think). When I image the Space Station, I begin by consulting this site and find out what the maximum magnitude will be. Then, once I get set up, I set the camera ISO according to a star that's about the same magnitude- the shutter speed must be fast to reduce motion blur, I've found 1/2000s works.
The quality of your ISS video is stunning. Would you mind describing the mount and setup process you use for aiming?
 
  • #1,532
Devin-M said:
The quality of your ISS video is stunning. Would you mind describing the mount and setup process you use for aiming?
Thanks!

Acquiring these timelapses is all about the planning and less about the equipment- a 400/2.8 nikkor with a 2x tele is my lens, a Nikon D810 is my camera, and my tripod- a regular (center post-less) tripod- has a Wimberley gimbal head. By putting one leg of the tripod 'through' the other two, the tripod allows the camera to view straight up.

The setup is also straightforward- once I know the ISS path and maximum brightness (both available on the heavens-above URL), I set up in a field and practice-track the ISS a few times to get the choreography down. As I said earlier, I set the camera focus and ISO by imaging a star with the same brightness as the (maximum) for ISS.

Tracking is 'easy', once I sight the ISS. I do tend to lose tracking as ISS passes directly overhead, when I step around the tripod to reposition myself and take my eyes away from the viewer. Imaging is RAW, but be mindful of the data transfer rate- it's easy to get excited, take a bunch of photos and fill up the camera memory buffer early in the flyover, will then have to wait until the buffer clears while ISS is getting closer to prime imaging location. The good news is that the fast shutter speed required means I don't need a remote shutter release or other mirror-up vibration delay, I can just aim and shoot normally.

When I'm done, I have about 100 images to crop, center, and assemble into an AVI.

How does that sound?
 
  • Like
  • Informative
Likes chemisttree, Keith_McClary, Devin-M and 2 others
  • #1,533
I've just serviced one of my 400mm tele lenses myself (I had bought one which was in need of servicing). It was a bit scary, but after a while it was quite fun (I've learned quite a few things about servicing by watching good youtube videos on the topic1).

Anyway, yesterday I decided to try the lens on the Moon, even though it was not quite a clear sky.
And it was also the first time I used a connected intervalometer with the camera. Since my camera has Wifi I could to this before with an app on my phone (which is pretty cool), but I got fed up using the app because I found it a bit annoying, and my hands also got cold when fiddling with the phone :smile:. I can use the newly acquired intervalometer with my gloves on now, which is nice.

Here are the results:

51761215098_b36bc42e51_z.jpg


With some more contrast:

51761623964_8928e996f4_z.jpg


Gear: Sony A6000 and a Tokina RMC 400mm f/5.6 tele lens.
Settings: f/8, 1/1000 s exposure, ISO 1000.
Processing: Stack of the best 50% of a total of 165 photos.
Software used: PIPP, AutoStakkert and Photoshop.

In the future I'm thinking of trying to improve further by shooting at optimal conditions, and also take many more shots for the stacking. :smile:

I'm also on the lookout for a decent teleconverter (M42 mount) to increase the focal length so I can get closer to the target(s) in the future.

Edit:

1 Here's one good youtube video on servicing lenses:
ESSENTIAL Maintenance Tips For Vintage Lenses! (Zenography)
 
Last edited:
  • Like
  • Love
  • Wow
Likes Oldman too, pinball1970, chemisttree and 3 others
  • #1,534
very interesting!
 
  • #1,535
Hello ,just for fun.. Jupiter on early evening sky- Tenerife island (I never noticed Jupiter so bright before..)
Lot of succes and happy new year..
 

Attachments

  • Jupiter Tenerife2-min.jpg
    Jupiter Tenerife2-min.jpg
    39.9 KB · Views: 105
  • Jupiter Tenerife-min.jpg
    Jupiter Tenerife-min.jpg
    36.3 KB · Views: 97
  • Like
Likes pinball1970, Keith_McClary, collinsmark and 1 other person
  • #1,536
bruha said:
Hello ,just for fun.. Jupiter on early evening sky- Tenerife island (I never noticed Jupiter so bright before..)
Lot of succes and happy new year..
Cool!

bruha said:
Lot of succes and happy new year..
And the same to you!

By the way, The James Webb Telescope will be launched in less than thirty minutes! The launch can be seen live here.
 
  • Like
Likes collinsmark
  • #1,537
  • Like
  • Wow
Likes collinsmark, bruha, pinball1970 and 1 other person
  • #1,538
I saw this and had to copy it. I thought all you telescope guys would get a kick out of it. It's 6 half hours (I skipped a lot) but there is some interesting stuff. His kit calibration and comments about viewing Webb.
Easier to see than Hubble?
16.49 he points to Webb (a suggestion from a viewer as he is streaming)

 
  • #1,539
pinball1970 said:
16.49 he points to Webb (a suggestion from a viewer as he is streaming)
Very cool! Some time after the launch I wondered if any astrophotographer was trying to capture JWST. :smile:
 
  • Like
Likes pinball1970
  • #1,540
A new stack from the previous photosession...

This time a color composition of the stacked final image and the surrounding clouds and moonlight
(clouds & moonlight shot at f/8, 1/15s exposure and ISO 1000).

Full:
51778683248_b7e444d88d_c.jpg


Cropped:
51779324770_681e75d72c_c.jpg
 
  • Like
  • Love
Likes Oldman too, Keith_McClary, pinball1970 and 2 others
  • #1,541
Thor’s Helmet nebula (NGC 2359) in the constellation Canis Major, taken from my back patio. The emission nebula is approximately 12,000 light years away, and about 30 light years across. Total integration time: 27.83 hours, in Hubble palette narrowband.

ThorsHelmetFinal_800x612_forPF.jpg


Vikings did not wear horns or wings on their helmets -- well, not the practical helmets anyway. It’s possible, albeit uncertain, that there may have been winged or horned helmets used for ritualistic purposes in Viking age Scandinavia. The Oseberg Tapestry (dated to about 834AD) is a rare example that may depict a procession leader wearing what looks like a helmet with wings or horns; however, it’s difficult to interpret.

What is known from Viking mythology is that Thor had a piece of whetstone (sharpening stone) lodged in his skull. I’ll briefly, very briefly, summarize this story from Skáldskaparmál in the Prose Edda.

Odin met a giant named Hrungnir, who was made mostly (or at least partially) of stone. A spontaneous horse race ensued between the two on their horses from the land of giants to Asgard. Odin and his horse Sleipnir arrived at the gates of Asgard first. The gods invited Hrungnir into Val-hall for a drink. Apparently, there’s lots of drinking to do in Val-hall. Drinking, it seems, is a big part of what those in Asgard do. And while there, Hrungnir drank a lot. Like a whole lot. Then he became quite belligerent.

Before I continue, this is really starting to remind me of an escapade I had myself, many, many years ago. One afternoon I took a break from my studies and went to the neighborhood pub for a late lunch. There was a horse race playing on the old television in the corner. An acquaintance ordered some shots. Another friend ordered a round of ale. And when it was my turn, I ordered both. Apparently, there was a lot of drinking to be done in the pub. Drinking, it seems, is a big part of what people in the bar do.

Equipment:
10” Meade LX200-ACF on a equatorial wedge
Optec Lepus 0.62 focal reducer
Astronomik narrowband filters (SII, Ha, Oiii)
ZWO ASI1600MM-COOL monochrome camera

Hrungnir started mouthing off, boasting and bragging, and mostly being very unpleasant. Freya kept serving him drinks and the rest of the gods at the table tolerated his outbursts because the gods are quite hospitable. This continued for some time. But when rude brags and boasts turned to threats, the gods called Thor into the hall. Thor had had enough and escorted him out of Val-hall. Enraged, Hrungnir challenged Thor to a duel as soon as Hrungnir could return with a giant whetstone, his favorite weapon, and his shield. Thor gladly accepted.

In my case, I didn’t make any boasts or threats, but after all the yelling and singing and dancing on the tables (my hip was OK back then), the bar staff made it pretty clear that I had overstayed my welcome.

Software:
Nighttime Imaging ‘N’ Astronomy (N.I.N.A.)
PixInsight
Topaz Labs Denoise AI

At the duel, Thor threw his hammer, Mjölnir, at Hrungnir, and Hrungnir threw his whetstone at Thor. The two weapons met in mid-air with the whetstone shattering followed by Hrungnir’s head shattering by Mjölnir. Part of the whetstone hit the ground (from which all other whetstone’s come) and another shard of the whetstone lodged in Thor’s skull.

In my adventure, I didn’t battle a stone giant, but I did stub my toe and tripped, falling on the hard concrete of the sidewalk. There may have been a few small bits of gravel stuck in my scalp.

Integration:
SII: 7.8 hours
Ha: 8.08 hours
Oiii: 11.95 hours
Total: 27.83 hours

In an effort to remove the whetstone, Thor sought out a sorceress called Groa, wife of Aurvandil the Bold. Thor had recently carried Aurvandil back from the land of the giants in a basket. It was very cold and Aurvandil’s toe had frozen off. Thor took Aurvandil's toe and threw it up into the heavens, where it became a star. Later, when Groa started her spells to remove the whetstone, Thor told her about meeting her husband, Aurvandil, and that he would be home soon. Groa was so overjoyed that her husband would be returning that she forgot all her spells. And thus, the whetstone in Thor’s skull would forever remain.

In my case, on my walk home, I was certainly in no condition to throw anything “up into the heavens,” but I did throw up right then and there.

Sources:
EDDA, Snorri Sturluson, translated by Anthony Faulkes, Published by Everyman 1987, Reissued 1992, 1995, pp. 77-80.
My personal story is unworthy to source.
 
  • Like
  • Love
Likes Oldman too, TSny, Devin-M and 4 others
  • #1,542
best rendering i’ve seen of a planetary collision…

 
  • Like
  • Wow
Likes TSny and pinball1970
  • #1,543
Devin-M said:
best rendering i’ve seen of a planetary collision…


Wow. Not much would survive that!
 
  • #1,544
Pleiades and California nebula.
-Sony A7 + Sony 50/1.8 + Sky Watcher Star Adventurer
-120x30s, f/2.8 iso 3200
-Photoshop and PixInsight
plejády kopie (1).jpg
 
  • Like
Likes Andy Resnick, DennisN, Devin-M and 1 other person
  • #1,545
Crescent moon tonight- hazy high clouds and very poor seeing conditions. 800/5.6 lens, 1/8s, ISO 400 (50% downsampled, original is 1750 x 1750 pixels):

DSC_4640.tiff (RGB)-1.jpg


And again, 1/8s ISO 8000:
DSC_4641.tiff (RGB).jpg
 
  • Like
Likes chemisttree, Devin-M, collinsmark and 2 others
  • #1,546
The Crab Nebula (M1) in the constellation Taurus, imaged from my back patio. The Crab Nebula is about 6,500 light years from Earth, and about 11 light years across. It is a supernova remnant and pulsar wind nebula. Its central star went supernova in the year 1054 (as seen from Earth) and was recorded by Chinese astronomers. What you’re seeing here is the result of the supernova and pulsar winds nearly 1000 years after the massive explosion. Imaged in Hubble pallet narrowband, total integration time: 15.6 hours.

Crab2021_SharpendFinal_SmallForPF.jpg


After weeks of cloudy skies and rain, I was feeling a little crabby. So, when the skies finally cleared, I decided to turn to big crab.

Equipment:
Meade 10” LX200-ACF on an equatorial wedge
Astronomik narrowband filters
ZWO ASI183MM monochrome camera

Software:
Nighttime Imaging ‘N’ Astronomy (N.I.N.A.)
PixInsight
Topaz Labs Denoise AI
Topaz Labs Sharpen AI

Integration:
All images binned 3x3
SII: 85x240sec (5.67 hours)
Ha: 84x240sec (5.60 hours)
Oiii: 65x240sec (4.33 hours)
Total integration time: 15.6 hours

Crab fun-facts:

The Crab Nebula (M1) is the first item in the Messier list [1].

The largest Earth-based crab is the Japanese Spider Crab, who’s body can grow up to 16 inches (40 cm) and who’s legs can grow up to 12.1 feet apart (3.7 m) [2]. You might think 12.1 feet is long for a crab, but that’s just peanuts compared to the Crab Nebula (M1).

There's a running joke among evolutionary biologists that given enough time, every (crustaceous) species will eventually become crab shaped [3].

"Crab people. Crab people. Taste like crab, talk like people.” [4]

The Chicago Bulls (basketball team) logo, when turned upside down, looks like a robot having intercourse with a crab [5].
EEcgzpiXsAIjKA0?format=jpg&name=360x360.jpg
EEcgzpjXoAAYZRt?format=jpg&name=360x360.jpg

I suspect – without evidence – that this is a subtle tribute to the Crab Nebula (M1) in the constellation Taurus, the bull. And robots. Sweet, sweet, crab lovin’ robots.

It would probably make sense to move the Crab Nebula (M1) from the constellation Taurus to Cancer, but that would take a lot of effort.

Sea stars and sea crabs can be antagonistic, fighting over coral [6]. Space stars and space crabs might seem antagonistic, with the supernova explosion, pulsar winds, and all, but that's just for show.

Crabs make you do your laundry [7].

Sources:
[1] https://en.wikipedia.org/wiki/Messier_object
[2] https://en.wikipedia.org/wiki/Japanese_spider_crab
[3] https://www.popsci.com/story/animals/why-everything-becomes-crab-meme-carcinization/
[4] https://southpark.fandom.com/wiki/Crab_People
[5] https://mashable.com/article/chicago-bulls-robot-sex-with-crab-logo
[6] https://peerj.com/articles/574/
[7] https://www.cdc.gov/parasites/lice/pubic/treatment.html
 
Last edited:
  • Like
Likes TSny, DennisN, Bystander and 2 others
  • #1,547
"Houston, I had no problem!"
- a 400 mm tele lens and 2x teleconverter versus the Moon

I found an old M42 teleconverter (which doubles the focal length) which I won on an online auction for a very good price. The brand is "Expert" (the company Expert was founded by a Swede) but I think it was made by a Japanese third-party producer (there's a "Made In Japan" text on it).

Here's the teleconverter:
Expert Teleconverter.jpg


I've read online that the quality of teleconverters can vary greatly, and also read that some complain
about diminishing image quality when using one. Therefore my expectations was moderate, but I was
pleasantly surprised by the result I got when I took it out for test run on the Moon.

According to Stellarium, this is what a 400mm tele lens and a 2x teleconverter (i.e. a focal length of totally 800mm) would look like (the red frame is what the sensor would capture):

Stellarium Screenshot.jpg


And sure enough, that is pretty much what it looked like. Here one frame of the original photo sequence:

Moon Sample Shot.jpg

(it looks a bit dim to my eyes, so I'll probably use a higher ISO next time)And here's the final image after stacking (25% of the best of totally 200 photos, grayscale):

51813081847_edb1b29419_k.jpg


Pretty nice detail, and I was quite pleased. :smile:

Since there was much detail, I digitally magnified a part in the northern hemisphere, and identified some features and places (with the help of the page Moon mountains observing guide (space.com)):

Moon mountains observing guide (space.com) said:
Two major mountain ranges divide two other features of the lunar landscape.The Mare Serenitatis ("Sea of Serenity") is separated from the Mare Imbrium ("Sea of Showers") by the Montes Caucasus to the north and the Montes Apenninus to the south. Where these two meet is the prominent mountain Mons Hadley, named for British optician and instrument maker John Hadley (1682–1743). Apollo 15 landed here in July 1971.
(my coloring to match my magnified image below)

Moon Details 1b.jpg

(here's a link to the Apollo 15 landing site on Google Moon (the landing site is in the center of that map))

And here's another stacked photo from my session in color:

51814764255_a324050a93_k.jpg


And here's the gear (with an attached intervalometer):

Utrustning.jpg


Gear: Sony A6000, Tokina 400mm f/6.3, Expert 2x teleconverter
Settings: f/8, 1/1000s exposure, ISO 800
Processing: 200 photos taken, 25% of the best stacked with AutoStakkert
Software used: PIPP, AutoStakkert and postprocessing in Photoshop
 
  • Like
  • Informative
Likes TSny, chemisttree, Keith_McClary and 2 others
  • #1,548
Have you tried this with a green filter?
 
  • #1,549
chemisttree said:
Have you tried this with a green filter?
No, I haven't got one for this setup. But thanks for the reminder! :smile:
I have heard about green filters for the Moon, but I had forgotten about it.
Do you think it would improve the imaging?
 
  • #1,550
No way to tell but if the optics have been corrected to a particular color, green is usually it. Fraunhofer doublets are usually corrected that way. Not sure about the lens and focal doubler you are using.

Does the lens exhibit any chromatic abberation in daylight photos?
 

Similar threads

Replies
12
Views
3K
Replies
9
Views
2K
Replies
24
Views
3K
Replies
13
Views
2K
Replies
10
Views
3K
Back
Top