Talk:Distance modulus
Add topic | Distance modulus was a Natural sciences good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake. | |||||||||
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Failed GA
[edit]I've removed this from the list of GA self nominations for a few reasons. The article is rather short, it's basically a definition and examples. All references are tangential, merely verifying that the examples given are factual. How did the concept of the distance modulus arise? How did it become standard?
In the case of the LMC, this means that the supernova SN1987A, with a peak apparent magnitude of 2.8, had an absolute magnitude of -15.7 - fairly low by supernova standards. — How the reader supposed to understand that this follows? More importantly, is it germane to the article? Pagrashtak 00:12, 10 March 2006 (UTC)
Changing 'luminosity' to 'flux' or 'irradiance' in the inverse square law
[edit]As the luminosity of an object is an intrinsic property of it, it will not vary with distance to an observer. That is why it is confusing to state an inverse square law for luminosities. Instead, one should say that the flux or irradiance of the object adheres to the inverse square law, as the flux / irradiance *does* depend on the distance from which the source is observed. This is in accordance to Wikipedia's descriptions of luminosity and irradiance. (In astronomy, 'flux' is more common, although there does not seem to exist a page dedicated to flux in the astronomical sense.) — Preceding unsigned comment added by Martijn Oei (talk • contribs) 16:23, 3 October 2015 (UTC)
Relation to implied distance
[edit]If true, could we note somewhere that +5 on distance modulus implies 10 times further away ? Perhaps have a short table ? - Rod57 (talk) 19:25, 16 January 2017 (UTC)
Example of usage for galactic distances
[edit]Bonanos, Alceste Z. (2006). "Eclipsing Binaries: Tools for Calibrating the Extragalactic Distance Scale". Proceedings of the International Astronomical Union. 2. arXiv:astro-ph/0610923. doi:10.1017/S1743921307003845. gives a table of estimates of distance modulii for Andromeda galaxy, with the reddening values used. - Rod57 (talk) 19:40, 16 January 2017 (UTC)
Bolometric distance modulus
[edit]As the article stands now, it describes the bolometric distance modulus (where the absolute and apparent magnitudes are not limited to any wavelength/frequency range). Since this article is talking about "what is actually measured at a telescope" (from the "Usage" section) and any telescope observation also has a filter/band-pass, it is important to highlight this in the page for the reader. When we are observing only a portion of the spectrum through a filter, we need to account for K-correction (that at higher redshift, the observed filter covers a smaller portion of the restframe spectrum). There are two nice (related) articles on the K-correction for the distance modulus: https://arxiv.org/abs/astro-ph/0210394 and https://ui.adsabs.harvard.edu/abs/2007AJ....133..734B Mohammad Akhlaghi (talk) 21:31, 7 June 2025 (UTC)