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NGC 189

Coordinates: Sky map 00h 39m 36s, +61° 04′ 00″
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NGC 189
NGC 189 from DSS
Observation data (J2000 epoch)
Right ascension0h 39m 28.8s[1]
Declination+61° 6m 54s[1]
Distance4,200 ly (1,300 pc)[1]
Apparent magnitude (V)8.8[2]
Apparent dimensions (V)0.120°[1]
Physical characteristics
Estimated age510 Myr[1]
Other designationsCr 462, C 0036+608, OCL 301
Associations
ConstellationCassiopeia
See also: Open cluster, List of open clusters

NGC 189 is an open cluster in the Cassiopeia constellation. It was discovered by Caroline Herschel on 27 September 1783, and independently rediscovered by John Herschel on 27 October 1829.[3]

NGC 189 orbits the Milky Way on a nearly circular orbit with an eccentricity of 0.053 and an orbital period of 231,000 years. It enters the solar circle at parts of its orbit, and is part of the thin disk of the Milky Way.[4]

References

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  1. ^ a b c d e Kharchenko, N. V.; et al. (2013). "Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters". Astronomy & Astrophysics. 558: A53. arXiv:1308.5822. Bibcode:2013A&A...558A..53K. doi:10.1051/0004-6361/201322302. S2CID 118548517.
  2. ^ "NGC 189". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 February 2021.
  3. ^ Seligman, Courtney. "New General Catalogue objects: NGC 150 – 199". cseligman.com. Retrieved 12 February 2021.
  4. ^ Yontan, Talar; Bilir, Selçuk; Çakmak, Hikmet; Raúl, Michel; Banks, Timothy; Soydugan, Esin; Canbay, Remziye; Taşdemir, Seval (2023). "CCD UBV and Gaia DR3 based analysis of NGC 189, NGC 1758 and NGC 7762 open clusters". Advances in Space Research. 72 (4): 1454–1473. arXiv:2304.04294. Bibcode:2023AdSpR..72.1454Y. doi:10.1016/j.asr.2023.04.015.
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