Making The Best of Light Polluted Skys

  • Context: High School 
  • Thread starter Thread starter Stratosphere
  • Start date Start date
  • Tags Tags
    Light
Click For Summary

Discussion Overview

The discussion revolves around observing celestial objects from areas with significant light pollution, specifically focusing on the visibility of stars, galaxies, and planets using binoculars and the potential use of a telescope. Participants share their experiences and suggestions for viewing astronomical objects under challenging conditions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant expresses concern about the visibility of celestial objects from a light-polluted area, particularly regarding 4-6.5 magnitude objects with 20x80 binoculars.
  • Another participant suggests that under heavy light pollution, only certain objects like the Orion Nebula and the central part of the Andromeda Galaxy may be visible, while also recommending observing from darker locations.
  • It is noted that after spending time in a dark location, the eyes may adjust to see more stars despite the light pollution.
  • Some participants mention that viewing planets like Saturn and Jupiter may not be significantly affected by light pollution, and that they can appear bright and detailed through binoculars.
  • There is a discussion about the limitations of telescopes in light-polluted areas, with some suggesting that the increased size of the telescope may not yield significantly better views of faint objects compared to binoculars.
  • One participant shares their experience with viewing the Pleiades and expresses difficulty in locating the Andromeda Galaxy during certain times of the year.
  • Another participant describes how Saturn may appear through binoculars, noting that it could be seen as a small disk with some rings visible, depending on the steadiness of the binoculars.

Areas of Agreement / Disagreement

Participants generally agree that light pollution significantly impacts the visibility of celestial objects, particularly fainter ones. However, there are differing opinions on the extent to which telescopes can improve viewing experiences in such conditions, and no consensus is reached on the best strategies for observing specific objects.

Contextual Notes

Participants mention various factors that could influence viewing conditions, such as the time of night, the position of celestial objects in the sky, and the need for dark-adapted eyes. Limitations related to the visibility of certain objects at different times of the year are also noted.

Stratosphere
Messages
373
Reaction score
0
I live in a very light polluted part of the country (NE) and I am unable to see any stars near the horizon but a lot of stars actual show up at around zenith, are there any ways for me to get good looks at things that are from 4-6.5 magnitude with only 20x80 binoculars? I am saving up for a telescope which i hope to buy in the next few months but will i even be able to see anything with such bad light pollution?
 
Astronomy news on Phys.org
Stratosphere said:
I live in a very light polluted part of the country (NE) and I am unable to see any stars near the horizon but a lot of stars actual show up at around zenith, are there any ways for me to get good looks at things that are from 4-6.5 magnitude with only 20x80 binoculars? I am saving up for a telescope which i hope to buy in the next few months but will i even be able to see anything with such bad light pollution?

By "good looks at things from 4-6.5 magnitude" I assume you mean galaxies, nebulae, and the like (because stars are easily visible at these magnitudes through your binoculars). I regret to inform you that if your skies are as light polluted as you say, the most you will probably be able to see is the Orion Nebula, and probably the central part of the Andromeda Galaxy (This will look nothing like a galaxy. Fair warning).

If you're only limited by binoculars, if you have a car it could be worth it to take a drive out to the country to get better looks at some astronomical objects. You can see the light pollution situation at:
http://www.cleardarksky.com/csk/

Which also gives a relatively accurate assessment of seeing, humidity, and other conditions.
Try, as much as possible, to observe from a location where there are no local lights (shining in your eyes, or even near you). After 10-20 minutes in such conditions your eyes will start to see many more stars despite no change in the overall light pollution.
Other things you might try viewing include open star clusters (particularly, start with the pleaides), and it doesn't hurt to try a globular cluster either (but don't expect much).

There's not much you can do about the pollution with binocs except get to a locally dark site or travel out the the country.

Also, do not expect markedly different results with a telescope from what you achieve with binoculars. In heavily light polluted skies, the amount of skyglow increases with the size of your lens, so the effect almost cancels out the increased light from the source. Basically, size doesn't matter much for faint of objects you can see. (This isn't strictly true but it's a good approximation which appears to hold true from my experiences) So, with a telescope expect to be able to see what you already can see with the binoculars, but with greater resolution (planets will appear much crisper, you may be able to see more detail in the Orion nebula), but again, don't hold out for markedly better images from a telescope.

Sorry if this all sounds a little grim, but I have been the victim of horrible light pollution as well and am quite bitter about it!
 
Nabeshin said:
By "good looks at things from 4-6.5 magnitude" I assume you mean galaxies, nebulae, and the like (because stars are easily visible at these magnitudes through your binoculars). I regret to inform you that if your skies are as light polluted as you say, the most you will probably be able to see is the Orion Nebula, and probably the central part of the Andromeda Galaxy (This will look nothing like a galaxy. Fair warning).

If you're only limited by binoculars, if you have a car it could be worth it to take a drive out to the country to get better looks at some astronomical objects. You can see the light pollution situation at:
http://www.cleardarksky.com/csk/

Which also gives a relatively accurate assessment of seeing, humidity, and other conditions.
Try, as much as possible, to observe from a location where there are no local lights (shining in your eyes, or even near you). After 10-20 minutes in such conditions your eyes will start to see many more stars despite no change in the overall light pollution.
Other things you might try viewing include open star clusters (particularly, start with the pleaides), and it doesn't hurt to try a globular cluster either (but don't expect much).

There's not much you can do about the pollution with binocs except get to a locally dark site or travel out the the country.

Also, do not expect markedly different results with a telescope from what you achieve with binoculars. In heavily light polluted skies, the amount of skyglow increases with the size of your lens, so the effect almost cancels out the increased light from the source. Basically, size doesn't matter much for faint of objects you can see. (This isn't strictly true but it's a good approximation which appears to hold true from my experiences) So, with a telescope expect to be able to see what you already can see with the binoculars, but with greater resolution (planets will appear much crisper, you may be able to see more detail in the Orion nebula), but again, don't hold out for markedly better images from a telescope.

Sorry if this all sounds a little grim, but I have been the victim of horrible light pollution as well and am quite bitter about it!
I have already viewed Pleiades which was not great because around this time of year Pleiades is only visible low in the sky so I was only able to see the 7 main stars in it. I would have tried to view the andromeda galaxy but I can’t find it around this time of year. How would Saturn appear through 20x80 binoculars? I would assume that Saturn would still be quit bright if I was looking for it around 1 AM since light pollution drops off a bit after mid night.
 
Stratosphere said:
I have already viewed Pleiades which was not great because around this time of year Pleiades is only visible low in the sky so I was only able to see the 7 main stars in it. I would have tried to view the andromeda galaxy but I can’t find it around this time of year. How would Saturn appear through 20x80 binoculars? I would assume that Saturn would still be quit bright if I was looking for it around 1 AM since light pollution drops off a bit after mid night.

Your viewing of the planets won't really be diminished at all by light pollution, which is the good news. Saturn will appear as a small disk in your 20x80s, and you should be able to make out some of the rings if you have the binoculars steady, although the rings are seen nearly edge on right now. Probably you'll also be able to see a moon or two. Jupiter, when it's in the sky, will look nice too, and again, if you have steady binoculars you should be able to make out some detail in the cloud structure and the four gallilean moons.

The good news is, these objects appear much more spectacular in a good (even decent) telescope, because you get to make use of the increased aperture to magnify. The bad news is that planets are about the most impressive thing you can view from a heavily light polluted sky.

It might be a little late to catch M42, because if memory serves it sets not too long (few hours) after sundown, but it might be worth trying to glimpse.
 

Similar threads

  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 20 ·
Replies
20
Views
6K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 17 ·
Replies
17
Views
4K
  • · Replies 13 ·
Replies
13
Views
5K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K