Astronomy:Upsilon1 Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 58m 40.75s[1] |
| Declination | −44° 48′ 12.9″[1] |
| Apparent magnitude (V) | +3.87[2] |
| Characteristics | |
| Spectral type | B2 IV/V[3] |
| B−V color index | −0.208±0.011[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.2±1.4[4] km/s |
| Proper motion (μ) | RA: −27.51±0.15[1] mas/yr Dec.: −22.44±0.13[1] mas/yr |
| Parallax (π) | 7.63 ± 0.16[1] mas |
| Distance | 427 ± 9 ly (131 ± 3 pc) |
| Absolute magnitude (MV) | −1.72[2] |
| Details | |
| Mass | 7.9±0.1[5] M☉ |
| Radius | 3.74±0.34[6] R☉ |
| Luminosity | 1,884[2] L☉ |
| Surface gravity (log g) | 4.15±0.07[6] cgs |
| Temperature | 21,411±377[6] K |
| Rotational velocity (v sin i) | 124[4] km/s |
| Age | 13.0±2.0[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon1 Centauri, Latinized from υ1 Centauri, is a single[8] star in the southern constellation of Centaurus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.87.[2] The distance to this object is approximately 427 light years based on parallax,[1] and is receding with a radial velocity of +9 km/s.[4] It is a member of the Lower Centaurus Crux group of the Scorpius–Centaurus association.[2]
The stellar classification of this object is B2 IV/V,[2] matching a massive B-type star with a luminosity class displaying mixed traits of a main sequence and a subgiant star. It is 13[5] million years old and is spinning with a projected rotational velocity of 124 km/s.[4] The star has 7.9[5] times the mass of the Sun and 3.7[6] times the Sun's radius. It is radiating 1,884[2] times the luminosity of the Sun from its photosphere at an effective temperature of 21,411 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Hiltner, W. A. et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal 157: 313–326, doi:10.1086/150069, Bibcode: 1969ApJ...157..313H.
- ↑ 4.0 4.1 4.2 4.3 Jilinski, E. et al. (March 2006), "Radial velocity measurements of B stars in the Scorpius–Centaurus association", Astronomy and Astrophysics 448 (3): 1001–1006, doi:10.1051/0004-6361:20041614, Bibcode: 2006A&A...448.1001J.
- ↑ 5.0 5.1 5.2 5.3 Tetzlaff, N. et al. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 6.0 6.1 6.2 6.3 6.4 Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, doi:10.1086/427855, Bibcode: 2005AJ....129.1642F.
- ↑ "ups01 Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups01+Oph.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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