Astronomy:1 Canis Minoris
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Canis Minor |
| Right ascension | 07h 24m 58.17971s[1] |
| Declination | +11° 40′ 10.2843″[1] |
| Apparent magnitude (V) | 5.37[2] |
| Characteristics | |
| Spectral type | A5 IV[3] or A4 V[4] |
| B−V color index | 0.105±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.0±4.2[2] km/s |
| Proper motion (μ) | RA: −15.263[1] mas/yr Dec.: −15.625[1] mas/yr |
| Parallax (π) | 11.3473 ± 0.1958[1] mas |
| Distance | 287 ± 5 ly (88 ± 2 pc) |
| Absolute magnitude (MV) | 0.44[2] |
| Details | |
| Mass | 2.15[5] M☉ |
| Radius | 4.6[6] R☉ |
| Luminosity | 66.3+3.8 −3.6[7] L☉ |
| Surface gravity (log g) | 3.87[5] cgs |
| Temperature | 8,374±285[5] K |
| Rotational velocity (v sin i) | 159[7] km/s |
| Age | 716[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Canis Minoris is a single[9] star in the equatorial constellation of Canis Minor, located about 287 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.37.[2] The radial velocity of this object is poorly constrained at −1.0±4.2 km/s.[2]
Cowley et al. (1969) listed a stellar classification of A5 IV[3] for 1 Canis Minoris, matching an A-type subgiant star that has exhausted the hydrogen at its core and is evolving into a giant. However, Gray and Garrison (1989) catalogued it as an A-type main-sequence star with a class of A4 V.[4] The Hipparcos team used a class of A3 Vn,[2] where the 'n' indicates "nebulous" lines due to rapid rotation.
This star is estimated to be 716[5] million years old and is at or near the end of its main sequence lifetime.[7] It has a high rate of spin, showing a projected rotational velocity of 159 km/s.[7] The star has more than double[5] the mass of the Sun with about 4.6[6] times the Sun's radius. It is radiating 66[7] times the Sun's luminosity from its photosphere at an effective temperature of 8,374 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 4.0 4.1 Gray, R. O.; Garrison, R. F. (July 1989), "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement 70: 623, doi:10.1086/191349, Bibcode: 1989ApJS...70..623G.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 6.0 6.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 7.0 7.1 7.2 7.3 7.4 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "1 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=1+CMi.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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