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HD 223960
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 23h 53m 49.98300s[2] |
| Declination | +60° 51′ 12.2438″[2] |
| Characteristics | |
| Evolutionary stage | blue supergiant |
| Spectral type | B9Ia[3] |
| U−B color index | −0.050[4] |
| B−V color index | +0.715[4] |
| Variable type | α Cyg[5] |
| Astrometry | |
| Radial velocity (Rv) | −48.1[6] km/s |
| Proper motion (μ) | RA: −3.009 mas/yr[2] Dec.: −2.205 mas/yr[2] |
| Parallax (π) | 0.3413±0.0147 mas[2] |
| Distance | 9,600 ± 400 ly (2,900 ± 100 pc) |
| Absolute magnitude (MV) | −6.9[7] |
| Details | |
| Mass | 19.2[7] M☉ |
| Radius | 89[7] R☉ |
| Luminosity | 315,000+99,000 −75,000[8] L☉ |
| Surface gravity (log g) | 1.48±0.10[8] cgs |
| Temperature | 10,700±200[8] K |
| Metallicity [Fe/H] | +0.02[7] dex |
| Rotational velocity (v sin i) | 32[3] km/s |
| Other designations | |
| V819 Cassiopeiae, BD+60°2636, HD 223960, HIP 117830[9] | |
| Database references | |
| SIMBAD | data |
HD 223960 is a supergiant star in the northern constellation Cassiopeia. Its brightness varies slightly around apparent magnitude 7 which makes it hard to be seen by the naked eye even from dark skies. Parallax measurements by the Gaia spacecraft suggest a distance of around 9,600 light years.
HD 223960 is tentatively classified as an α Cygni variable; its brightness changes erratically by less than a tenth of a magnitude with a primary period of about two days.[11] It is a hot supergiant star with a luminosity several hundred thousand times higher than the Sun's.
References
[edit]- ^ Anderson, E.; Francis, Ch. (2012-05-01). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Negueruela, I.; Simón-Díaz, S.; De Burgos, A.; Casasbuenas, A.; Beck, P. G. (2024). "The IACOB project: XII. New grid of northern standards for the spectral classification of B-type stars". Astronomy and Astrophysics. 690. arXiv:2407.04163. Bibcode:2024A&A...690A.176N. doi:10.1051/0004-6361/202449298.
- ^ a b Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy and Astrophysics. 543: A80. arXiv:1207.0308. Bibcode:2012A&A...543A..80F. doi:10.1051/0004-6361/201219034.
- ^ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
- ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ a b c d Verdugo, E.; Talavera, A.; Gómez De Castro, A. I. (1999). "Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants". Astronomy and Astrophysics. 346: 819. Bibcode:1999A&A...346..819V.
- ^ a b c Georgy, Cyril; Saio, Hideyuki; Meynet, Georges (2021). "Blue supergiants as tests for stellar physics". Astronomy and Astrophysics. 650: A128. arXiv:2104.06278. Bibcode:2021A&A...650A.128G. doi:10.1051/0004-6361/202040105.
- ^ "HD 223960". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-03-13.
- ^ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997HIP...C......0E. ISBN 9290923997. Retrieved 15 March 2025.
- ^ "V819 Cas". International Variable Star Index. Retrieved 2025-03-13.
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