Talk:Messier 13

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This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Amarpreetd. Peer reviewers: Tiakortman.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 03:56, 17 January 2022 (UTC)

Untitled

Shouldn't the comment at the bottom of the page be, like, here?

• Wikipedia Project: Astronomical Objects

Re: Arecibo Message We read: "Even though the message was transmitted, M13 will no longer be in that location when it arrives".

Intelligent life on earth should consider this and direct the message into that future direction!  :-))

--Hans W (talk) 15:20, 9 August 2010 (UTC)

Are you sure? The distance to the cluster is 25,100 light years, so it will take that long to arrive. For the cluster to have shifted by 27 parsecs (84 ly) in that time, I think it would need to have a transverse velocity of:

${\begin{smallmatrix}{\frac {27\ {\text{pc}}\times (3.1\times 10^{13}\ {\text{km/pc}})}{(2.5\times 10^{4}\ {\text{years}})\times (3.2\times 10^{7}\ {\text{seconds/year}})}}\ \approx \ 1,000\ {\text{km/s}}\end{smallmatrix}}$

Hence it would need to be moving faster than the escape velocity for the Milky Way (~310 km/s). Regards, RJH (talk) 17:14, 14 January 2012 (UTC)

What would be the average distance between stars in the cluster? That would be an interesting Fact to mention in the article. 95.166.163.23 (talk) 13:46, 7 January 2012 (UTC)

It varies by distance from the core. The article could probably list a core density though. Regards, RJH (talk) 17:14, 14 January 2012 (UTC)

Local Group

I'm no expert, but M13's distance from us suggests it's in the Milky Way's Local Group. If so, this should be mentioned in the article. Perhaps M13 should also be added to the List of Milky Way's satellite galaxies. Cheers 203.1.252.5 (talk) 04:18, 11 June 2014 (UTC)

TOPIC:

Messier 13: http://earthsky.org/clusters-nebulae-galaxies/m13-finest-globular-cluster-in-northern-skies https://www.nasa.gov/feature/goddard/2017/messier-13-the-hercules-cluster https://www.space.com/12021-hercules-star-cluster-night-sky-m13-messier.html http://www.messier.seds.org/m/m013.html https://www.universetoday.com/31430/messier-13/Amarpreetd (talk) 23:03, 15 February 2018 (UTC)

Yes, I just added this point with 2 citations, and afterward I noticed your suggestion here. Let me know if all is well! I placed the extra info under "Characteristics". Culveyhouse (talk) 01:51, 23 November 2021 (UTC)

Arithmetic?

The caption in the image gives a radius of 84 light years but the first line of the "Characteristics" section says "About 145 light-years in diameter, M13 is composed of ...". While the profile is not sharp edged, surely the two figures need to be consistent for whatever boundary is being used. George Dishman (talk) 18:59, 27 February 2023 (UTC)