Talk:Limiting magnitude

Latest comment: 1 year ago by StormBarn23 in topic Errors in section 'Calculating limiting magnitude'

Untitled

edit

For background limited observations, the limiting magnitude can be predicted from the derived zeropoints according to the formula (see McLean 1997):

mlim = zp-2.5log(S/N(nB/t)^1/2)

where: zp is the zeropoint magnitude (for 1 electron/sec), S/N is the requested signal-to-noise ratio, B is the background level (in electrons per second per pixel), t is the total on-source integration time and n is the number of pixels:

for point source: n = 3.1415 * (FWHM/pixel_size)^2 for extended source: n = (1/pixel_size)^2

Merge languages

edit

This page should be merged with Grenzgröße on the German wiki, but that one is linked to another language, and I can't figure out how to merge the two wikidata pages.Ckyba (talk) 10:57, 10 September 2014 (UTC)Reply

edit

Hello fellow Wikipedians,

I have just modified one external link on Limiting magnitude. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 00:50, 16 May 2017 (UTC)Reply

Errors in section 'Calculating limiting magnitude'

edit

Not only does this article need improved references, there are glaring errors. I have hidden Section 'Calculating limiting magnitude' until I can find son decent refs so I don't make the mistake of relying on my memory rather than reliable sources. Please, anyone, jump in here. — Neonorange (Phil) 06:09, 18 June 2021 (UTC)Reply

Below is likely a better source:

TELESCOPIC LIMITING MAGNITUDES

BRADLEY E. SCHAEFER

Publications of the Astronomical Society of the Pacific Vol. 102, No. 648 (February 1990), pp. 212-229 (18 pages) Published By: Astronomical Society of the Pacific

The complete article is behind a paywall at JSTOR, I will read the article this weekend and then try to improve the article. — Neonorange (Phil) 11:48, 18 June 2021 (UTC)Reply

I have added a new section on modelling limiting magnitude based on the 2014 MNRAS paper by Crumey - https://doi.org/10.1093/mnras/stu992 - which supersedes Schaefer's work and is cited in the most recent work on light pollution etc. StormBarn23 (talk) 17:00, 6 April 2023 (UTC)Reply
I've added another on telescopic limiting magnitudes, based on the same paper. StormBarn23 (talk) 10:16, 7 April 2023 (UTC)Reply