IC 361
{{Short description|Open cluster of stars in the constellation Camelopardalis}}
{{Infobox open cluster
| name = IC 361
| image = File:IC 361.jpg
| caption = Open star cluster IC 361 in the constellation Camelopardalis
| credit =
| epoch = J2000
| constellation = Camelopardalis
| dist_ly = {{cvt|3.22|±|0.07|kpc|ly|order=flip|lk=on}}
| dist_pc =
| size_v = {{val|6.0|ul=arcminute}}
| radius_ly = {{cvt|7.50|pc|ly|disp=out}}
| mass_msol = {{val|2459|491|fmt=commas}}
| notes =
}}
IC 361, also called Melotte 24 is an open cluster of stars in the constellation Camelopardalis. It was discovered by the British amateur astronomer William F. Denning on February 11, 1893. This cluster is located at a distance of {{convert|3.22|±|0.07|kpc|ly|disp=out|lk=on|abbr=off}} from the Sun. It is very faint with an apparent visual magnitude of 11.7, requiring a telescope to view. Because of its faintness, this cluster has been poorly studied. The cluster spans an angular size of {{val|6.0|ul=arcminute}}.
This intermediate–age cluster is located in or beyond the Perseus Arm of the Milky Way galaxy. It is situated near dark nebulae, resulting in significant levels of extinction due to interstellar dust. The cluster has a core radius of {{val|2.0|0.4|u=arcminute}} and a cluster radius of {{val|8.0|0.5|u=arcminute}}. At an estimated distance of {{val|3.22|u=kpc}} this corresponds to a physical core radius of {{cvt|1.87|pc|ly|disp=out}} and a cluster radius of {{cvt|7.50|pc|ly|disp=out}}. It has an estimated age of 759 million years. The cluster is mildly metal deficient, matching the metallicity gradient of the Milky Way.
Two candidate blue stragglers have been identified in this cluster.
References
{{reflist|refs=
| title=3D kinematics and age distribution of the open cluster population
| display-authors=1 | last1=Tarricq | first1=Y.
| last2=Soubiran | first2=C. | last3=Casamiquela | first3=L.
| last4=Cantat-Gaudin | first4=T. | last5=Chemin | first5=L.
| last6=Anders | first6=F. | last7=Antoja | first7=T.
| last8=Romero-Gómez | first8=M. | last9=Figueras | first9=F.
| last10=Jordi | first10=C. | last11=Bragaglia | first11=A.
| last12=Balaguer-Núñez | first12=L. | last13=Carrera | first13=R.
| last14=Castro-Ginard | first14=A. | last15=Moitinho | first15=A.
| last16=Ramos | first16=P. | last17=Bossini | first17=D.
| journal=Astronomy & Astrophysics
| volume=647 | at=id. A19 | date=March 2021
| doi=10.1051/0004-6361/202039388 | arxiv=2012.04017
| bibcode=2021A&A...647A..19T }}
| title=3,000 Deep-Sky Objects, An Annotated Catalogue
| first=Ted | last=Aranda | year=2011
| publisher=Springer New York | page=122
| isbn=9781441994196
| url=https://books.google.com/books?id=gc9oXfN3xYAC&pg=PA122 }}
| title=IC Objects: IC 350 - 399
| first=Courtney | last=Seligman
| work=Celestial Atlas
| url=https://cseligman.com/text/atlas/ic3a.htm#ic361
| access-date=2024-06-29 }}
| title=A near-infrared and UBVRI photometric analysis of the open cluster IC 361
| last=Joshi | first=Gireesh C.
| journal=Indian Journal of Physics
| volume=96 | issue=3 | pages=659–669 | date=March 2022
| doi=10.1007/s12648-021-02020-5 | arxiv=1901.02948
| bibcode=2022InJPh..96..659J }}
| title=IC 361, a distant intermediate-age cluster in Camelopardalis†
| display-authors=1 | last1=Zdanavičius | first1=Justas
| last2=Boyle | first2=Richard P. | last3=Vrba | first3=Frederick J.
| last4=Zdanavičius | first4=Kazimieras | last5=Bartašiūtė | first5=Stanislava
| work=Star clusters: basic galactic building blocks throughout time and space, Proceedings of the International Astronomical Union
| series=IAU Symposium
| volume=266 | pages=557–560 | date=January 2010
| doi=10.1017/S1743921309992080 | bibcode=2010IAUS..266..557Z }}
| title=Revisiting the mass of open clusters with Gaia data
| display-authors=1 | last1=Almeida | first1=Anderson
| last2=Monteiro | first2=Hektor | last3=Dias | first3=Wilton S.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=525 | issue=2 | pages=2315–2340 | date=October 2023
| doi=10.1093/mnras/stad2291 | doi-access=free
| arxiv=2307.15182
| bibcode=2023MNRAS.525.2315A }}
| title=IC 361 | access-date=2024-06-29
| mode=cs2 | postscript=. }}
| title=A new, Gaia-based, catalogue of blue straggler stars in open clusters
| display-authors=1 | last1=Rain | first1=M. J.
| last2=Ahumada | first2=J. A. | last3=Carraro | first3=G.
| journal=Astronomy & Astrophysics
| volume=650 | at=id. A67 | date=June 2021
| doi=10.1051/0004-6361/202040072 | arxiv=2103.06004
| bibcode=2021A&A...650A..67R }}
}}
Further reading
- {{citation | postscript=.
| title=Multicolor CCD Photometry of the Open Cluster IC 361
| display-authors=1 | last1=Zdanavičius | first1=J.
| last2=Bartašiūtė | first2=S. | last3=Boyle | first3=R. P.
| last4=Vrba | first4=F. J. | last5=Zdanavičius | first5=K.
| journal=Baltic Astronomy
| volume=19 | pages=63–94 | year=2010
| issue=1–2
| doi=10.1515/astro-2017-0413 | bibcode=2010BaltA..19...63Z | doi-access=free }}
- {{citation | postscript=.
| title=Preliminary photometry of the open cluster IC 361.
| last1=Piccirillo | first1=J. | last2=Stein | first2=W. L.
| journal=Astronomical Journal
| volume=83 | pages=971–974 | date=August 1978
| doi=10.1086/112277 | bibcode=1978AJ.....83..971P }}
- {{citation | postscript=.
| title=The cluster IC 361
| last=Shapley | first=H.
| journal=The Observatory
| volume=41 | pages=257 | date=June 1918
| bibcode=1918Obs....41..257S }}
{{Camelopardalis}}