NGC 2360 - Misplaced Pages

Open cluster in the constellation Canis Major

NGC 2360
SDSS
Observation data (J2000 epoch)
Right ascension	07 17 43
Declination	−15° 38′ 29″
Apparent magnitude (V)	7.2
Apparent dimensions (V)	13′
Physical characteristics
Other designations	Caroline's Cluster, Caldwell 58, Cr 134, Mel 64
Associations
Constellation	Canis Major
See also: Open cluster, List of open clusters

NGC 2360 (also known as Caroline's Cluster or Caldwell 58) is an open cluster in the constellation Canis Major. It was discovered on 26 February 1783 by Caroline Herschel, who described it as a "beautiful cluster of pretty compressed stars near 1/2 degree in diameter". Her notes were overlooked until her brother William included the cluster in his 1786 catalogue of 1000 clusters and nebulae and acknowledged her as the discoverer. The cluster lies 3.5 degrees east of Gamma Canis Majoris and less than one degree northwest of the eclipsing binary star R Canis Majoris; it has a combined apparent magnitude of 7.2. It is 13 arc minutes in diameter. By the western edge of the cluster is the unrelated star, 5.5-magnitude HD 56405.

American astronomer Olin J. Eggen surveyed the cluster in 1968, concluding that the brightest star in the field, magnitude-8.96 HD 56847, is likely to lie in the field and not a true member of the cluster. He also identified one or possibly two blue stragglers. These are unexpectedly hot and luminous stars that appear younger than surrounding stars, and have likely developed by sucking matter off companion stars. Four are now recognised to be in the cluster. By analysing the masses of the smallest stars that have evolved into red giants—namely, stars of 1.8 or 1.9 solar masses—Swiss astronomers Jean-Claude Mermilliod and Michel Mayor were able to date the age of the cluster at 2.2 billion years. The cluster has a diameter of around 15 light-years and is located 3700 light-years from Earth.

Sirius and M41 (lower right), M50 (upper left), and NGC 2360 (lower left)

Notes

^ "Results for NGC 2360". NGC/IC Project Database. Archived from the original on 2012-05-20. Retrieved 2010-12-03.
^ "SEDS Online NGC Database". Results for NGC 2360. Retrieved 2010-12-03.
^ "NGC 2360". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-12-03.
^ Hoskin, Michael (2005). "Caroline Herschel as observer" (PDF). Journal for the History of Astronomy. 36 (4): 373–406. Bibcode:2005JHA....36..373H. doi:10.1177/002182860503600402. S2CID 118428465.
^ O'Meara, Stephen James (2002). The Caldwell Objects. Cambridge University Press. pp. 231–33. ISBN 978-0-521-82796-6.
Streicher, Magda (April 2006). "Caroline Herschel's Deepsky Discoveries" (PDF). Deepsky Delights. The Astronomical Society of Southern Africa. pp. 234–36. Retrieved 16 March 2014.
Eggen, Olin J. (1968). "The Intermediate-Age Cluster NGC 2360" (PDF). The Astrophysical Journal. 152: 83–87. Bibcode:1968ApJ...152...83E. doi:10.1086/149526.
Fellman, Megan (17 October 2011). "Astronomers Explain 'Blue Stragglers'". News. Evanston, Illinois: Northwestern University. Retrieved 18 March 2014.
Ahumada, J. A.; Lapasset, E. (2007). "New catalogue of blue stragglers in open clusters". Astronomy and Astrophysics. 463 (2): 789–97. Bibcode:2007A&A...463..789A. doi:10.1051/0004-6361:20054590.
Mermilliod, Jean-Claude; Mayor, Michel (1990). "Red Giants in Open Clusters. III – Binarity and Stellar Evolution in Five Intermediate-age Clusters: NGC 2360, 2423, 5822, 6811, and IC 4756" (PDF). Astronomy and Astrophysics. 273 (1): 61–72. Bibcode:1990A&A...237...61M.

External links

NGC 2360 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Astronomical catalogs
NGC	NGC 2355 NGC 2356 NGC 2357 NGC 2358 NGC 2359 NGC 2360 NGC 2361 NGC 2362 NGC 2363 NGC 2364 NGC 2365
Caldwell	C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67
Collinder	Collinder 119 Collinder 120 Collinder 121 Collinder 122 Collinder 123 Collinder 124 Collinder 125 Collinder 126 Collinder 127

v t e New General Catalogue 2000 to 2499
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Astronomical catalog List of NGC objects 2001–3000

New General Catalogue 2000 to 2499

v t e Caldwell catalogue
List	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109
See also	Messier Catalogue Catalogue of Nebulae and Clusters of Stars New General Catalogue Index Catalogue Revised New General Catalogue Herschel 400 Catalogue
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Constellation of Canis Major

Stars

Bayer	α (Sirius) β (Mirzam) γ (Muliphein) δ (Wezen) ε (Adhara) ζ (Furud) η (Aludra) θ ι κ λ μ ν ν ν ξ ξ ο ο π σ (Unurgunite) τ ω
Flamsteed	10 11 12 15 17 26 27 29
Variable	R W Z UW VY CX EZ FN FS FY LS NR V352
HR	2225 2318 2437 2447 2450 2758 2764 2766 2812
HD	43162 43197 (Amadioha) 45184 45364 47186 54879
Other	RX J0720.4−3125 WASP-64 (Atakoraka) WISE 0713−2917 WR 7

Exoplanets	ν Canis Majoris b HD 47536 b c HD 47186 b c HD 45364 b c HD 43197 b

Star
clusters

NGC	NGC 2204 NGC 2354 NGC 2360 NGC 2362 NGC 2374
Other	Gaia 1 Messier 41

Nebulae	NGC 2359 NGC 2361 Sh2-297

Galaxies

NGC	2207 2217 2227 2280 2283 2293
Other	Canis Major Overdensity IC 2163

Astronomical events	SN 1999ec SN 2003H