Pi1 Columbae, Latinized from π1 Columbae, is a star in the southern constellation of Columba. With an apparent visual magnitude of 6.13,[2] it is a dim, white-hued star that is near the limit of visibility for the naked eye. It is located approximately 280 light years from the Sun based on parallax,[1] and has an absolute magnitude of +1.55.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 06m 41.03304s[1] |
| Declination | −42° 17′ 55.5846″[1] |
| Apparent magnitude (V) | 6.13[2] |
| Characteristics | |
| Spectral type | A2mA5-A9[3] |
| U−B color index | +0.11[2] |
| B−V color index | +0.25[2] |
| Astrometry | |
| Radial velocity (Rv) | 2.0±4.3[4] km/s |
| Proper motion (μ) | RA: −26.957[1] mas/yr Dec.: −5.880[1] mas/yr |
| Parallax (π) | 11.6365 ± 0.1653 mas[1] |
| Distance | 280 ± 4 ly (86 ± 1 pc) |
| Absolute magnitude (MV) | +1.55[5] |
| Details | |
| Radius | 2.49+0.15 −0.11[1] R☉ |
| Luminosity | 20.237+0.23 −0.33[1] L☉ |
| Temperature | 7,765+171 −228[1] K |
| Rotational velocity (v sin i) | 70[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an Am star with a stellar classification of A2mA5-A9.[3] It has 2.5 times the Sun's radius and shines with 20 times the luminosity of the Sun at an effective temperature of 7,765 K.[1] The star is spinning with a projected rotational velocity of 70 km/s.[6]
References
edit- ^ a b c d e f g h i j Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Feinstein, A. (1974), "Photoelectric UBVRI observations of AM stars", Astronomical Journal, 79: 1290, Bibcode:1974AJ.....79.1290F, doi:10.1086/111675.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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 Levato, O. H. (August 1972), "Rotational Velocities and Spectral Types of Some A-Type Stars", Publications of the Astronomical Society of the Pacific, 84 (500): 584, Bibcode:1972PASP...84..584L, doi:10.1086/129336
- ^ "pi01 Col". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
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