// Workers AI · dad joke modeWhat did Upsilon1 Centauri say? You psilon me.
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| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 13h 58m 40.75s[2] |
| Declination | −44° 48′ 12.9″[2] |
| Apparent magnitude (V) | +3.87[1] |
| Characteristics | |
| Spectral type | B2 IV/V[3] |
| B−V color index | −0.208±0.011[1] |
| Astrometry | |
| Radial velocity (Rv) | +9.2±1.4[4] km/s |
| Proper motion (μ) | RA: −27.51±0.15 mas/yr[2] Dec.: −22.44±0.13 mas/yr[2] |
| Parallax (π) | 7.63±0.16 mas[2] |
| Distance | 427 ± 9 ly (131 ± 3 pc) |
| Absolute magnitude (MV) | −1.72[1] |
| Details | |
| Mass | 7.9±0.1[5] M☉ |
| Radius | 3.74±0.34[6] R☉ |
| Luminosity | 1,884[1] 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 | |
| υ1 Cen, CD−44°9010, FK5 3112, HD 121790, HIP 68282, HR 5249, SAO 224585[7] | |
| Database references | |
| SIMBAD | data |
Upsilon1 Centauri is a single[8] star in the southern constellation of Centaurus. Its name is a Bayer designation that is Latinized from υ1 Centauri, and abbreviated Upsilon1 Cen or υ1 Cen. This star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.87.[1] The distance to this object is approximately 427 light years based on parallax,[2] 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.[1]
The stellar classification of this object is B2 IV/V,[1] 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[1] times the luminosity of the Sun from its photosphere at an effective temperature of 21,411 K.[6]
References
[edit]- 1 2 3 4 5 6 7 8 9 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 XHIP record for this object at VizieR.
- 1 2 3 4 5 6 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. Vizier catalog entry
- ↑ Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
- 1 2 3 4 Jilinski, E.; et al. (March 2006), "Radial velocity measurements of B stars in the Scorpius–Centaurus association", Astronomy and Astrophysics, 448 (3): 1001–1006, arXiv:astro-ph/0601643, Bibcode:2006A&A...448.1001J, doi:10.1051/0004-6361:20041614, S2CID 17818058.
- 1 2 3 4 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- 1 2 3 4 5 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, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
- ↑ "ups01 Oph", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2019-10-21
- ↑ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
