Eta Canis Minoris

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Eta Canis Minoris
Eta canis minoris diagram.png
Star map of the 25 brightest stars in Canis Minor. Eta Canis Minoris is circled.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Minor
Right ascension  07h 28m 02.07527s[1]
Declination +06° 56′ 31.0897″[1]
Apparent magnitude (V) 5.25[2] + 11.1[3]
Spectral type F0 III[3]
U−B color index +0.17[2]
B−V color index +0.22[2]
Radial velocity (Rv)+17.2[4] km/s
Proper motion (μ) RA: −2.955 ± 0.231[5] mas/yr
Dec.: −43.624 ± 0.197[5] mas/yr
Parallax (π)10.2691 ± 0.1452[5] mas
Distance318 ± 4 ly
(97 ± 1 pc)
Absolute magnitude (MV)0.1[6]
η CMi A
Mass2.16[4] M
Luminosity57.5[4] L
Surface gravity (log g)3.66[7] cgs
Temperature7,505±66[4] K
Rotational velocity (v sin i)54[8] km/s
Age818[7] Myr
Other designations
η CMi, 5 CMi, BD+07° 1729, GC 9970, HD 58923, HIP 36265, HR 2851, SAO 115477, ADS 6101, CCDM 07280+0657[9]
Database references

Eta Canis Minoris (η CMi, η Canis Minoris) is a binary star[3] system in the equatorial constellation of Canis Minor. It is approximately 318 light years from Earth.

The primary component, η Canis Minoris A, is a yellow-white F-type giant with an apparent magnitude of +5.24. Its companion, η Canis Minoris B, is an eleventh magnitude star located 4 arcseconds from the primary, though is actually around 440 AU from the main star and takes around 5000 years to orbit it.[10]


  1. ^ a b 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.
  2. ^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. ^ a b c 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.
  4. ^ a b c d Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88.
  5. ^ a b c 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.
  6. ^ Jaschek, C.; Gomez, A. E. (1998), "The absolute magnitude of the early type MK standards from HIPPARCOS parallaxes", Astronomy and Astrophysics, 330 (619–625), Bibcode:1998A&A...330..619J.
  7. ^ 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.
  8. ^ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943.
  9. ^ "eta CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-31.
  10. ^ Kaler, Jim, "Eta and Delta-1 CMi", Stars, University of Illinois, retrieved 2017-09-01.