Delta1 Canis Minoris

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

Delta1 Canis Minoris
Delta1 canis minoris.png
Star map of the 25 brightest stars in Canis Minor. Delta1 Canis Minoris is circled.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Minor
Right ascension  07h 32m 05.94912s[1]
Declination +01° 54′ 52.1263″[1]
Apparent magnitude (V) +5.25[2]
Spectral type F0 V[3] or F0 III[4]
U−B color index +0.20[2]
B−V color index +0.22[2]
Radial velocity (Rv)+29.1±2.8[5] km/s
Proper motion (μ) RA: −1.64[1] mas/yr
Dec.: −1.10[1] mas/yr
Parallax (π)4.29 ± 0.27[1] mas
Distance760 ± 50 ly
(230 ± 10 pc)
Absolute magnitude (MV)−1.59[6]
Luminosity319[7] L
Surface gravity (log g)3.64±0.09[8] cgs
Temperature7,623±86[8] K
Metallicity [Fe/H]+0.15±0.05[8] dex
Rotational velocity (v sin i)50[9] km/s
Other designations
δ1 CMi, 7 CMi, BD+02° 1691, FK5 2587, GC 10085, HD 59881, HIP 36641, HR 2880, SAO 115581[10]
Database references

Delta1 Canis Minoris, Latinized from δ1 Canis Minoris, is a solitary,[11] yellow-white hued star in the constellation Canis Minor, it is faintly visible to the naked eye with an apparent visual magnitude of +5.25.[2] Based upon an annual parallax shift of 4.29 mas as seen from Earth,[1] this star is located roughly 760 light years from the Sun.

Houk and Swift (1999) list a stellar classification of F0 V[3] for Delta1 Canis Minoris, indicating it is an F-type main-sequence star. However, Cowley et al. (1969) gave it a class of F0 III, which would suggest it is instead an evolved giant star.[4] The spectrum displays a higher than solar metallicity – a term indicating the abundance of elements other than hydrogen and helium compared to the Sun; the star is spinning with a projected rotational velocity of 50[9] km/s and is radiating 319[7] times the Sun's luminosity from its photosphere at an effective temperature of 7,623 K.[8]


  1. ^ a b c d e f 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 d 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 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  4. ^ 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.
  5. ^ 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, A61.
  6. ^ 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.
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. ^ a b c d Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: 25, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, A165.
  9. ^ a b Jasniewicz, G.; et al. (July 2006), "Lithium abundances for early F stars: new observational constraints for the Li dilution", Astronomy and Astrophysics, 453 (2): 717–722, Bibcode:2006A&A...453..717J, doi:10.1051/0004-6361:20054421.
  10. ^ "del01 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-03.
  11. ^ 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.

External links[edit]