Recent content by Schmetterling

Ok, but in that table the values for "m" don't appear, only the fluxes :-s

How to calculate the visual magnitude of a star having only the flux of such star? The equation involves 2 magnitudes and 2 fluxes, corresponding to 2 objects a and b: ma-mb= -2.5log10\left( \frac{F_a}{F_b}\right) but I just have Fa and I have to obtain ma. Is it valid to take...

Oh, I have it!, I have it! other factors are eliminated leaving only masses quotint^4!

Thanks, I have the value of class. e- radius, r_e= 2.818e-15, rather I need right values for radii of proton and alpha particles, because those I found are... odd: r_p=2.1e-16 r_α=2.1e-15 How can be possible r_p<r_e?! Another founded value for r_p is 8.6e-16, and r_alpha =4r_p... I've tried to...

Wait... How to obtain m_p from r_p (or viceversa) if don't know density? I found already values for r_p and r_α, ~10^-16,-15 m, but I would like how to deduce them. Substitute p & α parameters into expression for r_e gives me radius ~10^-37!

Ohhh! You're right! I didn't consider that, only took the given value for σT...:blushing: Thanks!

Hello! I'm solving problems which come with their answers... but I get different results! Can you help me, please? The problem statement and equations are in the attached images. Homework Statement (Image) Also: U=energy in Joules β=v/c≈1 (relativ. particles) μ0=4π×10-7 Homework Equations...

It is good idea to write a list with my activities and dues. Organization, prioritizing & estimate times... Yes... I have trouble with that, though I'm trying to get organized. Almost always I underestimate how long it will take me to do things, time flies! :frown: Yes, I do so (both)...

Yes! Finally, I finished that hw! Thank you very much everybody! :-D

Yes, I think so. I changed date, now it is ok :-)

But it's supposed that the webpage gives the best date for observing! ¬¬ I have changed date, haha. And also, what objects' spectra could I obtain if weather conditions aren't good? Not M87, I guess...

Ohhhh! I know! If "Mdist." is a Moon distance, then "Mill." is Moon illumination! :approve: But, Mill = 80% at optimum observability? :-s

Of course! But IC3568 couldn't be observed due telescope's limits...

What is the meaning of "Mdist." and "Mill." at http://catserver.ing.iac.es/staralt/index.php webpage? And "The Nickel Telescope is available to the University of California astronomical community by subscription" --> isn't it available to any astronomer?

:-D Thank you very very very much! I will see the webpages right now!