HD 223960

HD 223960
Observation data; Epoch J2000 Equinox J2000
Constellation	Cassiopeia
Right ascension	23h 53m 49.98300s
Declination	+60° 51′ 12.2438″
Characteristics
Evolutionary stage	blue supergiant
Spectral type	B9Ia
U−B color index	−0.050
B−V color index	+0.715
Variable type	α Cyg
Astrometry
Radial velocity (Rv)	−48.1 km/s
Proper motion (μ)	RA: −3.009 mas/yr ; Dec.: −2.205 mas/yr
Parallax (π)	0.3413±0.0147 mas
Distance	9,600 ± 400 ly ; (2,900 ± 100 pc)
Absolute magnitude (MV)	−6.9
Details
Mass	19.2 M☉
Radius	89 R☉
Luminosity	315,000+99,000; −75,000 L☉
Surface gravity (log g)	1.48±0.10 cgs
Temperature	10,700±200 K
Metallicity [Fe/H]	+0.02 dex
Rotational velocity (v sin i)	32 km/s
Other designations
	V819 Cassiopeiae, BD+60°2636, HD 223960, HIP 117830
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

↑ 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.
1 2 3 4 5 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.
1 2 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.
1 2 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.
1 2 3 4 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.
1 2 3 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.{{cite journal}}: CS1 maint: periodical has ISBN (link)
↑ "V819 Cas". International Variable Star Index. Retrieved 2025-03-13.

[xhip-1] 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.

[dr3-2] 1 2 3 4 5 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.

[iacob-3] 1 2 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.

[firnstein2012-4] 1 2 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.

[gcvs-5] 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.

[rv-6] Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.

[verdugo1999-7] 1 2 3 4 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.

[georgy2021-8] 1 2 3 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.

[simbad-9] "HD 223960". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-03-13.

[CDS-10] 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.{{cite journal}}: CS1 maint: periodical has ISBN (link)

[vsx-11] "V819 Cas". International Variable Star Index. Retrieved 2025-03-13.

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Observation data Epoch J2000 Equinox J2000
Constellation	Cassiopeia^[1]
Right ascension	23^h 53^m 49.98300^s^[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 (R_v)	−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 (M_V)	−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