NGC 6025 is an open cluster of stars in the southern constellation of Triangulum Australe, near the northern constellation border with Norma. It was discovered by Abbe Lacaille in 1751 during his expedition to the Cape of Good Hope.[4][5] The cluster is in the Caldwell catalogue as entry number 95,[2] and is located at a mean distance of 2,410 ly from the Sun.[1] NGC 6025 can be spotted with the naked eye,[6] but is better viewed with a set of large binoculars.[2] It has an apparent visual magnitude of 5.1 and spans an angular size of 15′.[2]
 NGC 6025 and the surrounding star field Credit: DECaPS | |
| Observation data (J2000 epoch) | |
|---|---|
| Right ascension | 16h 03m 07.0s[1] |
| Declination | −60° 25′ 48″[1] |
| Distance | 2,410 ly (739.0 pc)[1] |
| Apparent magnitude (V) | 5.1[2] |
| Apparent dimensions (V) | 15′[2] |
| Physical characteristics | |
| Estimated age | 40 to 69 Myr[3] |
| Other designations | Caldwell 95, Collinder 296, Melotte 139, Lacaille III.10, Dunlop 304 |
| Associations | |
| Constellation | Triangulum Australe |
The Trumpler class of this cluster is II3p, indicating, "a detached cluster with but little central condensation, composed of moderately bright and faint stars numbering less than 50."[7] The brightest cluster member is MQ Triangulum Australis, with a magnitude of 7.1.[2] This is a blue straggler with a stellar classification of B1Ve.[8] NGC 6025 is a moderately young cluster with an age between 40 and 69 Myr.[3] The cluster is metal-rich compared to the Sun; more so than the Hyades cluster.[9] Seven spectroscopic binary star systems have been identified.[10] Only one blue straggler has been found among the members, along with two Be candidates.[3]
References
edit- ^ a b c d Tarricq, Y.; et al. (March 2021). "3D kinematics and age distribution of the open cluster population". Astronomy & Astrophysics. 647. id. A19. arXiv:2012.04017. Bibcode:2021A&A...647A..19T. doi:10.1051/0004-6361/202039388.
- ^ a b c d e f Mobberley, Martin (2009). The Caldwell Objects and How to Observe Them. Springer New York. p. 198. ISBN 9781441903266.
- ^ a b c Aidelman, Y.; et al. (May 2015). "Open clusters. II. Fundamental parameters of B stars in Collinder 223, Hogg 16, NGC 2645, NGC 3114, and NGC 6025". Astronomy & Astrophysics. 577. id. A45. Bibcode:2015A&A...577A..45A. doi:10.1051/0004-6361/201425085.
- ^ Seligman, Courtney. "New General Catalog Objects: NGC 6000 - 6049". cseligman.com. Retrieved 2023-11-13.
- ^ Jones, K. G. (March 1969). "The search for the nebulae - VI". Journal of the British Astronomical Association. 79: 213–222. Bibcode:1969JBAA...79..213J.
- ^ Bakich, Michael E. (2010). 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. The Patrick Moore Practical Astronomy Series. Springer Science & Business Media. p. 186. ISBN 9781441917775.
- ^ Hogg, A. R. (1953). "Photometry of the galactic cluster NGC 6025". Monthly Notices of the Royal Astronomical Society. 113: 746. Bibcode:1953MNRAS.113..746H. doi:10.1093/mnras/113.6.746.
- ^ Grosso, M.; Levato, H. (October 2011). "Spectral morphology and rotation in the open cluster NGC 6025". Revista Mexicana de Astronomía y Astrofísica. 47: 255–259. Bibcode:2011RMxAA..47..255G.
- ^ Cameron, L. M. (June 1985). "Metallicities and distances of galactic clusters as determined from UBV-data. II. The metallicities and distances of 38 open clusters". Astronomy and Astrophysics. 147: 39–46. Bibcode:1985A&A...147...39C.
- ^ Levato, H.; et al. (August 2004). Allen, Christine; Scarfe, Colin (eds.). Spectroscopic binaries in southern open clusters. The Environment and Evolution of Double and Multiple Stars, Proceedings of IAU Colloquium 191, held 3-7 February, 2002 in Merida, Yucatan, Mexico. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias). Vol. 21. pp. 141–142. Bibcode:2004RMxAC..21..141L.
Further reading
edit- Paunzen, E.; et al. (April 2014). "Photoelectric search for peculiar stars in open clusters. XV. Feinstein 1, NGC 2168, NGC 2323, NGC 2437, NGC 2547, NGC 4103, NGC 6025, NGC 6633, Stock 2, and Trumpler 2". Astronomy & Astrophysics. 564. id. A42. arXiv:1403.3538. Bibcode:2014A&A...564A..42P. doi:10.1051/0004-6361/201423521.
- Kilambi, G. C. (December 1975). "Intermediate- and wide-band photometry of NGC 6025". Publications of the Astronomical Society of the Pacific. 87: 975–981. Bibcode:1975PASP...87..975K. doi:10.1086/129883.
- Feinstein, A. (December 1971). "The open cluster NGC 6025". Publications of the Astronomical Society of the Pacific. 83: 800. Bibcode:1971PASP...83..800F. doi:10.1086/129216.
External links
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Media related to NGC 6025 at Wikimedia Commons- NGC 6025 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
