| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 29m 52.97918s [1] |
| Declination | +78° 49′ 27.4282″ [1] |
| Apparent magnitude (V) | 5.50 [2] |
| Characteristics | |
| Spectral type | A3 V [3] |
| U−B color index | +0.07 [2] |
| B−V color index | +0.06 [2] |
| Astrometry | |
| Proper motion (μ) |
RA: +3.68
[1]
mas/
yr Dec.: −21.29 [1] mas/ yr |
| Parallax (π) | 13.31 ± 0.21 mas [1] |
| Distance | 245 ± 4
ly (75 ± 1 pc) |
| Absolute magnitude (MV) | +1.07 [4] |
| Details | |
| Mass | 2.23±0.03 [5] M☉ |
| Luminosity | 32 [4] L☉ |
| Surface gravity (log g) | 4.2 [6] cgs |
| Temperature | 8,511 [5] K |
| Rotational velocity (v sin i) | 133 [7] km/s |
| Age | 85 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho2 Cephei, Latinized from ρ2 Cephei, or simply ρ Cephei, is a solitary [9] star in the northern constellation of Cepheus. With an apparent visual magnitude of 5.50, [2] it is faintly visible to the naked eye, forming an optical pair with Rho1 Cephei. Based upon an annual parallax shift of 13.31 mas as seen from the Earth, [1] it is located about 245 light years from the Sun.
Rho2 Cephei is an A-type main sequence star with a stellar classification of A3 V, [3] estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s. [7] The effective temperature of its photosphere is 8,511 K and its bolometric luminosity, the total amount of radiation it emits at all wavelengths, is 32 L☉.
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 131–134, Bibcode: 1983A&AS...52..131O.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode: 1969AJ.....74..375C, doi: 10.1086/110819.
- ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv: 1604.06456. Bibcode: 2016AJ....152...40G. doi: 10.3847/0004-6256/152/2/40. S2CID 119179065.
- ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv: astro-ph/0610785, Bibcode: 2007A&A...463..671R, doi: 10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "rho Cep -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-05.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 29m 52.97918s [1] |
| Declination | +78° 49′ 27.4282″ [1] |
| Apparent magnitude (V) | 5.50 [2] |
| Characteristics | |
| Spectral type | A3 V [3] |
| U−B color index | +0.07 [2] |
| B−V color index | +0.06 [2] |
| Astrometry | |
| Proper motion (μ) |
RA: +3.68
[1]
mas/
yr Dec.: −21.29 [1] mas/ yr |
| Parallax (π) | 13.31 ± 0.21 mas [1] |
| Distance | 245 ± 4
ly (75 ± 1 pc) |
| Absolute magnitude (MV) | +1.07 [4] |
| Details | |
| Mass | 2.23±0.03 [5] M☉ |
| Luminosity | 32 [4] L☉ |
| Surface gravity (log g) | 4.2 [6] cgs |
| Temperature | 8,511 [5] K |
| Rotational velocity (v sin i) | 133 [7] km/s |
| Age | 85 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho2 Cephei, Latinized from ρ2 Cephei, or simply ρ Cephei, is a solitary [9] star in the northern constellation of Cepheus. With an apparent visual magnitude of 5.50, [2] it is faintly visible to the naked eye, forming an optical pair with Rho1 Cephei. Based upon an annual parallax shift of 13.31 mas as seen from the Earth, [1] it is located about 245 light years from the Sun.
Rho2 Cephei is an A-type main sequence star with a stellar classification of A3 V, [3] estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s. [7] The effective temperature of its photosphere is 8,511 K and its bolometric luminosity, the total amount of radiation it emits at all wavelengths, is 32 L☉.
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 131–134, Bibcode: 1983A&AS...52..131O.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode: 1969AJ.....74..375C, doi: 10.1086/110819.
- ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv: 1604.06456. Bibcode: 2016AJ....152...40G. doi: 10.3847/0004-6256/152/2/40. S2CID 119179065.
- ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv: astro-ph/0610785, Bibcode: 2007A&A...463..671R, doi: 10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "rho Cep -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-05.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.