Caroline's Cluster (NGC 2360)

NGC 2360
NGC 2360: Section of DSS2 [147]


Caroline Herschel discovered this open cluster on 26 February 1783 with her small refractor. This was her first deep-sky discovery, although the cluster was listed as number two in her discovery log. M 93 was the first. Her brother William immediately verified it with his 6.2-inch reflector. About eight months later William started to sweep the sky using his 18.7-inch reflecting telescope, where Caroline almost exclusively assisted his observations. [364] On 4 February 1784 he classified the cluster as seventh class (pretty much compressed clusters of large or small stars) with the designation VII 12. He remarked: «A beautiful cluster of pretty compressed stars near 1/2 degree diameter. C. H.» [463] Dreyer later listed this cluster as NGC 2360 in his «New General Catalogue» [313]

Physical Properties

Based on Gaia DR2 proper motion data, there were 332 cluster members identified. The logarithmic age was determined to 8.95±0.05 (891 million years) and the distance to 982±132 parsec. [240]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Designation NGC 2360
Type OCL (II2m)
Right Ascension (J2000.0) 07h 17m 43.1s
Declination (J2000.0) -15° 38' 29"
Diameter 14 arcmin
Visual magnitude 7.2 mag
Metric Distance 1.887 kpc
Dreyer Description Cl, vL, Ri, pC, st 9…12
Identification, Remarks OCL 589

Finder Chart

The open cluster NGC 2360 is located in the constellation Canis Maior. The best time for observation is in the months from November through February.

Finder Chart Caroline's Cluster (NGC 2360)
Caroline's Cluster (NGC 2360) in constellation Canis Maior. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

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