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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]

1 Canis Minoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas[1]
Distance287 ± 5 ly
(88 ± 2 pc)
Absolute magnitude (MV)0.44[2]
Details
Mass2.15[5] M☉
Radius4.6[6] R☉
Luminosity66.3+3.8
−3.6[7] L☉
Surface gravity (log g)3.87[5] cgs
Temperature8,374±285[5] K
Rotational velocity (v sin i)159[7] km/s
Age716[5] Myr
Other designations
1 CMi, BD+11°1578, GC 9891, HD 58187, HIP 35987, HR 2820, SAO 96871[8]
Database references
SIMBADdata

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. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  7. 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.
  8. "1 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-01.
  9. 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.

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