1 Canis Minoris
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Canis Minor |
| Right ascension | 07h 24m 58.18002s[1] |
| Declination | +11° 40′ 10.2825″[1] |
| Apparent magnitude (V) | 5.37[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1][3] |
| Spectral type | A5 IV[4] or A4 V[5] |
| B−V color index | 0.105±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.0±4.2[2] km/s |
| Proper motion (μ) | RA: −15.574[1] mas/yr Dec.: −15.478[1] mas/yr |
| Parallax (π) | 10.9796±0.0959 mas[1] |
| Distance | 297 ± 3 ly (91.1 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.44[2] |
| Details | |
| Mass | 2.02[6] M☉ |
| Radius | 3.28[6] R☉ |
| Luminosity | 44[6] L☉ |
| Surface gravity (log g) | 3.71[6] cgs |
| Temperature | 8,222[6] K |
| Rotational velocity (v sin i) | 159[3] km/s |
| Age | 716[7] Myr |
| Other designations | |
| 1 CMi, BD+11°1578, GC 9891, HD 58187, HIP 35987, HR 2820, SAO 96871[8] | |
| 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[4] 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.[5] 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 million years old[7] and is at or near the end of its main sequence lifetime.[3] It has a high rate of spin, showing a projected rotational velocity of 159 km/s.[3] The star has more than double the mass of the Sun with about 3.3 times the Sun's radius.[6] It is radiating 44 times the Sun's luminosity from its photosphere at an effective temperature of 8,222 K.[6]
References
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g 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 c d Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b 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, Bibcode:1989ApJS...70..623G, doi:10.1086/191349.
- ^ a b c d e f g Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
- ^ a b 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "1 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-01.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.