NGC 2324
| NGC 2324 | |
|---|---|
 Pan-STARRS image of NGC 2324 | |
| Observation data (J2000 epoch) | |
| Right ascension | 07h 04m 07.9s[1] |
| Declination | +01° 02′ 46″[1] |
| Distance | 13.63 ± 0.78 kly (4.18 ± 0.24 kpc)[2] |
| Apparent magnitude (V) | 8.4[3] |
| Apparent dimensions (V) | 8′[3] |
| Physical characteristics | |
| Estimated age | 790±150[2] |
| Other designations | NGC 2324, C 0701+011, Melotte 59[4] |
| Associations | |
| Constellation | Monoceros[3] |
NGC 2324 is a well-studied[2] open cluster of stars in the equatorial constellation of Monoceros.[3] It is a faint aggregation that can be viewed using a moderate-sized telescope, looking to the northwest of the star Delta Monocerotis near the constellation border with Canis Minor.[5] The cluster was discovered on December 27, 1786 by German-British astronomer William Herschel.[6] It has an apparent visual magnitude of 8.4 and an angular size of 8′.[3] NGC 2324 is located at a distance of approximately 13,600 ly from the Sun.[2]
This cluster lies 35° from the galactic anticenter,[7] and is currently 37,900 light-years (11.61 kpc) from the Galactic Center[8] beyond the Perseus spiral arm. 852 high probability member stars have been identified. It has an estimated radius of 35.7 ± 2.1 ly and a tidal radius of 43.5 ly. Isochrone fitting provides an estimated age of 790 million years. The cluster has achieved dynamic equilibrium and has an estimated dissociation time of 382 million years from now.[2]
Fourteen giant star candidates have been studied in NGC 2324, of which nine were confirmed as members.[9] One blue straggler star has been identified.[10] 29 suspected variable stars have been spotted in the field of NGC 2324.[11]
References
[edit]- 1 2 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.
- 1 2 3 4 5 Raj, Cyrus; et al. (July 2026), "Stellar Dynamics and Evolution of the Intermediate-Age Open Clusters NGC 2266 and NGC 2324", eprint arXiv, arXiv:2607.24614, Bibcode:2026arXiv260724614R.
- 1 2 3 4 5 Finlay, Warren H. (2014), Concise Catalogue of Deep-Sky Objects, The Patrick Moore Practical Astronomy Series (2nd ed.), Springer Cham, p. 201, doi:10.1007/978-3-319-03170-5, ISBN 978-3-319-03169-9.
- ↑ "NGC 2324". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2026-10-06.
- ↑ O'Meara, Stephen James (2007), Herschel 400 Observing Guide, Cambridge University Press, pp. 56–57, ISBN 978-0-521-85893-9.
- ↑ Seligman, Courtney, "NGC Objects: NGC 2300 - 2349", Celestial Atlas, retrieved 2026-10-06.
- ↑ Cuffey, James (July 1941), "The Galactic Clusters Messier 46, Messier 50, and NGC 2324", Astrophysical Journal, 94: 55, Bibcode:1941ApJ....94...55C, doi:10.1086/144312.
- ↑ Netopil, Martin; et al. (January 2022), "The Galactic metallicity gradient shown by open clusters in the light of radial migration", Monthly Notices of the Royal Astronomical Society, 509 (1): 421–439, arXiv:2110.11893, Bibcode:2022MNRAS.509..421N, doi:10.1093/mnras/stab2961.
- ↑ Mermilliod, J.-C.; et al. (August 2001), "Red giants in open clusters. IX. NGC 2324, 2818, 3960 and 6259", Astronomy and Astrophysics, 375: 30–39, Bibcode:2001A&A...375...30M, doi:10.1051/0004-6361:20010845.
- ↑ Rain, M. J.; et al. (June 2021), "A new, Gaia-based, catalogue of blue straggler stars in open clusters", Astronomy & Astrophysics, 650, id. A67, arXiv:2103.06004, Bibcode:2021A&A...650A..67R, doi:10.1051/0004-6361/202040072.
- ↑ Aiad, A. (1986), "Suspected photovisual variables in the field of NGC 2324", Bulletin of the Faculty of Science, Cairo University, 54: 745–750, Bibcode:1986BFSCU..54..745A.
Further reading
[edit]- Tautvaišienė, Gražina; et al. (October 2016), "CNO abundances and carbon isotope ratios in evolved stars of the open clusters NGC 2324, NGC 2477, and NGC 3960", Astronomy & Astrophysics, 595, id. A16, arXiv:1608.08398, Bibcode:2016A&A...595A..16T, doi:10.1051/0004-6361/201629273.
- Bragaglia, A.; et al. (March 2008), "Old open clusters as key tracers of Galactic chemical evolution. II. Iron and elemental abundances in NGC 2324, NGC 2477 NGC 2660, NGC 3960, and Berkeley 32", Astronomy and Astrophysics, 480 (1): 79–90, Bibcode:2008A&A...480...79B, doi:10.1051/0004-6361:20077904.
- Marshall, J. L.; et al. (October 2005), "Survey for Transiting Extrasolar Planets in Stellar Systems. II. Spectrophotometry and Metallicities of Open Clusters", The Astronomical Journal, 130 (4): 1916–1928, arXiv:astro-ph/0506738, Bibcode:2005AJ....130.1916M, doi:10.1086/432685.
- Piatti, A. E.; et al. (May 2004), "The relatively young, metal-poor and distant open cluster NGC 2324", Astronomy and Astrophysics, 418: 979–988, Bibcode:2004A&A...418..979P, doi:10.1051/0004-6361:20041015-1.
- Kyeong, Jae-Mann; et al. (December 2001), "UBVI CCD Photometry of Open Cluster NGC 2324", Journal of the Korean Astronomical Society, 34 (3): 143–147, Bibcode:2001JKAS...34..143K, doi:10.5303/JKAS.2001.34.3.143.
- Marie, M. (February 1993), "Astrometry of the open cluster NGC 2324", Astrophysics and Space Science, 201 (1): 71–77, Bibcode:1993Ap&SS.201...71M, doi:10.1007/BF00626975.
