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NGC 7790 is a young open cluster[1] of stars located some 10,800[2] light years away from Earth in the northern constellation of Cassiopeia. At this distance, the light from the cluster has undergone extinction from interstellar gas and dust equal to E(B – V ) = 0.51 magnitude in the UBV photometric system. NGC 7790 has a Trumpler class rating of II2m[2] and the estimated age is 60–80 million years.[3] It contains three cepheid variables: CEa Cas, CEb Cas, and CF Cas.[2]
| NGC 7790 | |
|---|---|
 NGC 7790 (taken from Stellarium) Credit: Roberto Mura | |
| Observation data (J2000.0 epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 23h 58m 24.2s[1] |
| Declination | +61° 12′ 30″[1] |
| Distance | 10.76 ± 0.75 kly (3.30 ± 0.23 kpc)[2] |
| Apparent magnitude (V) | 8.5 |
| Apparent dimensions (V) | 7′.4[2] diameter |
| Physical characteristics | |
| Estimated age | 60–80[3] Myr |
| Other designations | Cr 461 |
This cluster is on an orbit through the Milky Way galaxy that has an eccentricity of 0.22 ± 0.07 and a period of (225.0 ± 27.1) million years. It will come as close as 20.2 ± 3.9 kly (6.2 ± 1.2 kpc) to, and as distant as 31.6 ± 2.9 kly (9.7 ± 0.9 kpc) from, the Galactic Center. The maximum distance reached above (or below) the galactic plane is 0.78 ± 1.30 kly (0.24 ± 0.40 kpc). On average, it will cross the galactic plane every (35.7 ± 13.0) million years.[4]
References
- Revised New General Catalogue and Index Catalogue, Wolfgang Steinicke, February 2009, retrieved 2013-07-01.
{{citation}}: External link in|publisher= - Gupta, A. C.; et al. (September 2000), "A complete photometric study of the open cluster NGC 7790 containing Cepheid variables", Astronomy and Astrophysics Supplement, 145 (3): 365–375, Bibcode:2000A&AS..145..365G, doi:10.1051/aas:2000247.
- Davidge, T. J. (December 2012), "The Young Open Clusters King 12, NGC 7788, and NGC 7790: Pre-main-sequence Stars and Extended Stellar Halos", The Astrophysical Journal, 761 (2): 155, arXiv:1211.6398, Bibcode:2012ApJ...761..155D, doi:10.1088/0004-637X/761/2/155.
- Wu, Zhen-Yu; et al. (November 2009), "The orbits of open clusters in the Galaxy", Monthly Notices of the Royal Astronomical Society, 399 (4): 2146–2164, arXiv:0909.3737, Bibcode:2009MNRAS.399.2146W, doi:10.1111/j.1365-2966.2009.15416.x.
External links
Media related to NGC 7790 at Wikimedia Commons- NGC 7790 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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 | This star cluster–related article is a stub. You can help Wikipedia by expanding it. |
На других языках
[de] NGC 7790
NGC 7790 ist ein offener Sternhaufen vom Typ III2p im Sternbild Kassiopeia am Nordsternhimmel. Er ist rund 9600 Lichtjahre vom Sonnensystem entfernt, hat einen Durchmesser von etwa 14 Lichtjahren und ist ungefähr 55 Millionen Jahre alt.- [en] NGC 7790
[ru] NGC 7790
NGC 7790 (другое обозначение — OCL 276) — рассеянное скопление в созвездии Кассиопея.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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