Messier 25

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Open cluster in Sagittarius

title: "Messier 25" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["open-clusters", "orion–cygnus-arm", "sagittarius-(constellation)", "messier-objects", "ic-objects", "astronomical-objects-discovered-in-1745"] description: "Open cluster in Sagittarius" topic_path: "general/open-clusters" source: "https://en.wikipedia.org/wiki/Messier_25" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Open cluster in Sagittarius ::

::data[format=table title="Infobox open cluster"]

FieldValue
nameMessier 25
image[[Image:M025.jpg
captionOpen cluster Messier 25 in Sagittarius
epochJ2000.0
ra
dec
dist_ly620 pc
appmag_v4.6
size_v
mass_msol
radius_ly2 pc
age
namesMessier 25, IC 4725, Cr 382, C 1828–192, Mel 204
::

| name = Messier 25 | image = [[Image:M025.jpg|250px]] | caption = Open cluster Messier 25 in Sagittarius | epoch = J2000.0 | ra = | dec = | dist_ly = 620 pc | appmag_v = 4.6 | size_v = | mass_msol = | radius_ly = 2 pc | age = | notes = | names = Messier 25, IC 4725, Cr 382, C 1828–192, Mel 204

Messier 25, also known as IC 4725, is an open cluster of stars in the southern constellation of Sagittarius. The first recorded observation of this cluster was made by Philippe Loys de Chéseaux in 1745 and it was included in Charles Messier's list of nebulous objects in 1764. The cluster is located near some obscuring features, with a dark lane passing near the center.

M25 is at a distance of about 620 pc away from Earth and is 67.6 million years old. The spatial dimension of this cluster is about 4 pc across. It has an estimated mass of , of which about 24% is interstellar matter. A Delta Cephei type variable star designated U Sagittarii is a member of this cluster, as are two red giants, one of which is a binary system.

New research indicates M25 may constitute a ternary star cluster together with NGC 6716 and Collinder 394.

References

| title=Astrometry of the Open Cluster M25 | last1=Tadross | first1=A. L. | last2=Marie | first2=M. A. | last3=Osman | first3=A. I. | last4=Hassan | first4=S. M. | journal=Astrophysics and Space Science | postscript=. | volume=282 | issue=4 | pages=607–623 | year=2002 | doi=10.1023/A:1021137115870 | bibcode=2002Ap&SS.282..607T | s2cid=117960833 }}

| title=Illustrated Guide to Astronomical Wonders: From Novice to Master Observer | series=DIY science | postscript=. | first1=Robert | last1=Thompson | first2=Barbara | last2=Thompson | publisher=O'Reilly Media, Inc. | year=2007 | isbn=978-0596526856 | page=408 | url=https://books.google.com/books?id=ymt9nj_uPhwC&pg=PA408 }}

| last1=Wu | first1=Zhen-Yu | last2=Zhou | first2=Xu | last3=Ma | first3=Jun | last4=Du | first4=Cui-Hua | title=The orbits of open clusters in the Galaxy | journal=Monthly Notices of the Royal Astronomical Society | volume=399 | issue=4 | pages=2146–2164 | date=November 2009 | arxiv=0909.3737 | bibcode=2009MNRAS.399.2146W | doi=10.1111/j.1365-2966.2009.15416.x | doi-access=free | s2cid=6066790 | postscript=. }}

| last1=Kharchenko | first1=N. V. | last2=Piskunov | first2=A. E. | last3=Röser | first3=S. | last4=Schilbach | first4=E. | last5=Scholz | first5=R.-D. | display-authors=1 | title=Astrophysical parameters of Galactic open clusters | journal=Astronomy and Astrophysics | volume=438 | issue=3 | pages=1163–1173 | year=2005 | bibcode=2005A&A...438.1163K | arxiv=astro-ph/0501674 | doi=10.1051/0004-6361:20042523 | s2cid=9079873 | postscript=. }}

| title=Cepheids in Galactic Clusters. VIII. a Reinvestigation of U SGR in M25 (= IC 4725) | last1=Wampler | first1=J. | last2=Pesch | first2=Peter | last3=Hiltner | first3=W. A. | last4=Kraft | first4=Robert P. | journal=Astrophysical Journal | display-authors=1 | volume=133 | page=895 | date=May 1961 | postscript=. | doi=10.1086/147092 | bibcode=1961ApJ...133..895W | doi-access=free }}

| title=Membership of cepheids and red giants in 8 open clusters : NGC 129, 6067, 6087, 6649, 6664, IC 4725, LY 6, RU 79 | last1=Mermilliod | first1=J. C. | last2=Mayor | first2=M. | last3=Burki | first3=G. | display-authors=1 | journal=Astronomy and Astrophysics Supplement Series | volume=70 | pages=389–407 | date=September 1987 | bibcode=1987A&AS...70..389M | postscript=. }}

| title=The Galactic Cluster M25 | last1=Landolt | first1=Arlo U. | postscript=. | journal=Astrophysical Journal Supplement | volume=8 | page=352 | date=February 1964 | doi=10.1086/190093 | bibcode=1964ApJS....8..352L | doi-access=free }}

| title=A Rare Cepheid-hosting Open Cluster Triad in Sagittarius | last1=Majaess | first1=D. | last2=Turner | first2=D. | last3=Usenko | first3=I. | display-authors=1 | journal=Research Notes of the AAS | volume=8 | issue=8 | pages=205 | date=August 2024 | doi=10.3847/2515-5172/ad7139 | bibcode=2024RNAAS...8..205M | doi-access=free | postscript=. }}

References

  1. "Messier 25".
  2. "IC 4725".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

open-clustersorion–cygnus-armsagittarius-(constellation)messier-objectsic-objectsastronomical-objects-discovered-in-1745