All Questions
Tagged with absolute-magnitude brightness
2 questions
2
votes
1
answer
273
views
What is the unit for 'magnitude' in terms of the Isophotal diameter of a galaxy?
Every site and AI and Google say that one way of measuring a galaxy's diameter is in terms of its isophotal diameter, using the blue D25 standard, using units of, "25 mag per arcsec2".
But ...
- 5,585
2
votes
1
answer
61
views
Standard definitions (ISO?) about subjects related to light emitted by stars
I'm a big fan of astrophysics and astronomy. However i'm quite confused by reading these last years plenty of books on the subject with various definitions (vocabulary) and notations for the same ...
- 233