Astronomy - Measuring Distance, Size, and Luminosity (18 of 30) Absolute Magnitude

[@THEASTRONERS]

Best teacher , and the best channel to learn astronomy

[@sunetamendis5262]

Great video. Oddly satisfying to watch this...

[@theworldofspace8620]

i wanted to learn how to calculate the magnitude of a star and now I know, thanks for the explanation.....Beautifull explanation

[@MichelvanBiezen]

Happy to help

[@homo_spider5607]

Sir, my favourite subject is history and I start reading astrophysics recently. I find your video easy to understand. Thanks

[@MichelvanBiezen]

You are most welcome

[@manisky9026]

Teacher Mattersssssss... Thank you for the awesome explaination.

[@MichelvanBiezen]

Glad it was helpful!

[@manisky9026]

@@MichelvanBiezen Thank You :)

[@ezasuddy4558]

Where do you get the number 2.512 from when doing the brightness difference calculations? Great video btw 👍🏻

[@MichelvanBiezen]

That number was chosen (not by me) so that 2.512^5 = 100 by design.

[@alexiapickens3428]

How do you find the flux ratio if you are only given the magnitude of one star? Im trying to solve this question and am very confused. If we have a two identical stars and one is twice as far, and the close stars apparent magnitude is +5 how do we know the magnitude of the other star? I don't understand how I should find the flux ratio if I'm only given one apparent magnitude. The apparent visible magnitude of the closer star is +5. What is the apparent visible magnitude of the more distant star?

[@MichelvanBiezen]

They are identical stars so they have the same absolute brightness. If one is twice as far, the intensity will be 1/4. Then you take 2.512^m = 4 (for the close one being 4 time brighter). Take the ln of both sides and you get m ln(2.512) = ln (4) solve for m and you get 1.5 That means the far star has an apparent magnitude of 5 - 1.5 = 3.5

[@barcan8371]

great video!

[@mustyndusty8277]

Thanks! Don’t stop!

[@ms.minchin6277]

Honestly a life saver!!

[@lelouchvibritannia3440]

What is v band magnitude?

[@MrDscrow]

Great videos! Thanks for the refresher :)

[@yugo7731]

this is so helpfull thanks :-)

[@MichelvanBiezen]

Glad it was helpful!

[@AudreyHerrera97]

i love u

[@MichelvanBiezen]

We are glad you like our videos! 🙂

[@baraaamer9869]

but...lunar magnitude......w.ist..in this..all....