  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 28m 51.61448s [1] |
| Declination | −17° 48′ 49.2693″ [1] |
| Apparent magnitude (V) | +4.78 [2] (4.97 + 6.88) [3] |
| Characteristics | |
| Spectral type | F2 IV [2] + G1 [4] |
| Astrometry | |
| Radial velocity (Rv) | +18.4 [5] km/s |
| Proper motion (μ) |
RA: −14.98
[1]
mas/
yr Dec.: −7.29 [1] mas/ yr |
| Parallax (π) | 33.04 ± 0.46 mas [1] |
| Distance | 99 ± 1
ly (30.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 2.52 + 4.56 [4] |
| Orbit [3] | |
| Period (P) | 278 yr |
| Semi-major axis (a) | 1.877″ |
| Eccentricity (e) | 0.91 |
| Inclination (i) | 113.3° |
| Longitude of the node (Ω) | 162.0° |
| Periastron epoch (T) | 1965.0 |
|
Argument of periastron (ω) (secondary) | 144.5° |
| Details [6] | |
| ρ Cap A | |
| Mass | 1.52±0.04 M☉ |
| Radius | 1.3 [2] R☉ |
| Luminosity | 9 [7] L☉ |
| Surface gravity (log g) | 4.02±0.03 cgs |
| Temperature | 6,911±63 K |
| Metallicity [Fe/H] | −0.20±0.05 dex |
| Rotational velocity (v sin i) | 87.7 [8] km/s |
| Age | 1.74±0.15 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | ρ Cap |
| ρ Cap A | |
| ρ Cap B | |
| ARICNS | ρ Cap A |
| ρ Cap B | |
Rho Capricorni (ρ Cap, ρ Capricorni) is a binary star [3] in the constellation Capricornus. Sometimes, this star is called by the name Bos, meaning the cow in Latin. [10] In Chinese, 牛宿 (Niú Su), meaning Ox (asterism), refers to an asterism consisting of β Capricorni, α2 Capricorni, ξ2 Capricorni, π Capricorni, ο Capricorni and ρ Capricorni. [11] Consequently, the Chinese name for ρ Capricorni itself is 牛宿六 (Niú Su liù, English: the Sixth Star of Ox.) [12]
This system is visible to the naked eye with a combined apparent visual magnitude of +4.78. [2] The pair orbit each other with a period of 278 years and an eccentricity of 0.91. [3] Based upon an annual parallax shift of 33.04 mas as seen from the Earth, [1] the system is located about 99 light years from the Sun. It is a thin disk population [6] star system that made its closest approach to the Sun about 1.6 million years ago when it came within 12.49 ly (3.830 pc). [13]
The primary member, component A, is a yellow-white hued, F-type subgiant with an apparent magnitude of 4.97 [3] and a stellar classification of F2 IV. [2] This star has 1.5 [6] times the mass of the Sun and 1.3 times the Sun's radius. It is radiating 9 times [7] as much luminosity of the Sun from its outer atmosphere at an effective temperature of 6,911 K. [6] The companion, component B, has a visual magnitude of 6.88. [3] The mass ratio is 0.539, meaning the secondary is only 53.9% as massive as the primary. [14]
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 e Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode: 1990A&AS...85.1015M.
- ^ a b c d e f Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, retrieved 2017-05-12
- ^ a b Cvetkovic, Z.; Ninkovic, S. (June 2010), "On the Component Masses of Visual Binaries", Serbian Astronomical Journal, 180 (180): 71–80, Bibcode: 2010SerAJ.180...71C, doi: 10.2298/SAJ1080071C.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode: 1953GCRV..C......0W.
- ^ a b c d Ramírez, I.; et al. (September 2012), "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets", The Astrophysical Journal, 756 (1): 46, arXiv: 1207.0499, Bibcode: 2012ApJ...756...46R, doi: 10.1088/0004-637X/756/1/46, S2CID 119199829.
- ^ a b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode: 2009A&A...493.1099S, doi: 10.1051/0004-6361:200810377[ permanent dead link]
- ^ "rho Cap -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-12.
- ^ "Bos", constellationsofwords.com, retrieved 2017-05-12.
- ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 13 日
- ^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv: 1412.3648, Bibcode: 2015A&A...575A..35B, doi: 10.1051/0004-6361/201425221, S2CID 59039482, A35.
- ^ Makarov, Valeri V.; Fabricius, Claus (2021). "Astrometric Mass Ratios of 248 Long-period Binary Stars Resolved in Hipparcos and Gaia EDR3". The Astronomical Journal. 162 (6): 260. arXiv: 2109.11951. Bibcode: 2021AJ....162..260M. doi: 10.3847/1538-3881/ac2ee0. S2CID 237635330.
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| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 28m 51.61448s [1] |
| Declination | −17° 48′ 49.2693″ [1] |
| Apparent magnitude (V) | +4.78 [2] (4.97 + 6.88) [3] |
| Characteristics | |
| Spectral type | F2 IV [2] + G1 [4] |
| Astrometry | |
| Radial velocity (Rv) | +18.4 [5] km/s |
| Proper motion (μ) |
RA: −14.98
[1]
mas/
yr Dec.: −7.29 [1] mas/ yr |
| Parallax (π) | 33.04 ± 0.46 mas [1] |
| Distance | 99 ± 1
ly (30.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 2.52 + 4.56 [4] |
| Orbit [3] | |
| Period (P) | 278 yr |
| Semi-major axis (a) | 1.877″ |
| Eccentricity (e) | 0.91 |
| Inclination (i) | 113.3° |
| Longitude of the node (Ω) | 162.0° |
| Periastron epoch (T) | 1965.0 |
|
Argument of periastron (ω) (secondary) | 144.5° |
| Details [6] | |
| ρ Cap A | |
| Mass | 1.52±0.04 M☉ |
| Radius | 1.3 [2] R☉ |
| Luminosity | 9 [7] L☉ |
| Surface gravity (log g) | 4.02±0.03 cgs |
| Temperature | 6,911±63 K |
| Metallicity [Fe/H] | −0.20±0.05 dex |
| Rotational velocity (v sin i) | 87.7 [8] km/s |
| Age | 1.74±0.15 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | ρ Cap |
| ρ Cap A | |
| ρ Cap B | |
| ARICNS | ρ Cap A |
| ρ Cap B | |
Rho Capricorni (ρ Cap, ρ Capricorni) is a binary star [3] in the constellation Capricornus. Sometimes, this star is called by the name Bos, meaning the cow in Latin. [10] In Chinese, 牛宿 (Niú Su), meaning Ox (asterism), refers to an asterism consisting of β Capricorni, α2 Capricorni, ξ2 Capricorni, π Capricorni, ο Capricorni and ρ Capricorni. [11] Consequently, the Chinese name for ρ Capricorni itself is 牛宿六 (Niú Su liù, English: the Sixth Star of Ox.) [12]
This system is visible to the naked eye with a combined apparent visual magnitude of +4.78. [2] The pair orbit each other with a period of 278 years and an eccentricity of 0.91. [3] Based upon an annual parallax shift of 33.04 mas as seen from the Earth, [1] the system is located about 99 light years from the Sun. It is a thin disk population [6] star system that made its closest approach to the Sun about 1.6 million years ago when it came within 12.49 ly (3.830 pc). [13]
The primary member, component A, is a yellow-white hued, F-type subgiant with an apparent magnitude of 4.97 [3] and a stellar classification of F2 IV. [2] This star has 1.5 [6] times the mass of the Sun and 1.3 times the Sun's radius. It is radiating 9 times [7] as much luminosity of the Sun from its outer atmosphere at an effective temperature of 6,911 K. [6] The companion, component B, has a visual magnitude of 6.88. [3] The mass ratio is 0.539, meaning the secondary is only 53.9% as massive as the primary. [14]
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 e Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode: 1990A&AS...85.1015M.
- ^ a b c d e f Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, retrieved 2017-05-12
- ^ a b Cvetkovic, Z.; Ninkovic, S. (June 2010), "On the Component Masses of Visual Binaries", Serbian Astronomical Journal, 180 (180): 71–80, Bibcode: 2010SerAJ.180...71C, doi: 10.2298/SAJ1080071C.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode: 1953GCRV..C......0W.
- ^ a b c d Ramírez, I.; et al. (September 2012), "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets", The Astrophysical Journal, 756 (1): 46, arXiv: 1207.0499, Bibcode: 2012ApJ...756...46R, doi: 10.1088/0004-637X/756/1/46, S2CID 119199829.
- ^ a b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode: 2009A&A...493.1099S, doi: 10.1051/0004-6361:200810377[ permanent dead link]
- ^ "rho Cap -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-12.
- ^ "Bos", constellationsofwords.com, retrieved 2017-05-12.
- ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 13 日
- ^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv: 1412.3648, Bibcode: 2015A&A...575A..35B, doi: 10.1051/0004-6361/201425221, S2CID 59039482, A35.
- ^ Makarov, Valeri V.; Fabricius, Claus (2021). "Astrometric Mass Ratios of 248 Long-period Binary Stars Resolved in Hipparcos and Gaia EDR3". The Astronomical Journal. 162 (6): 260. arXiv: 2109.11951. Bibcode: 2021AJ....162..260M. doi: 10.3847/1538-3881/ac2ee0. S2CID 237635330.
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