Delta3 Canis Minoris

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Delta3 Canis Minoris
Delta3 canis minoris diagram.png
Star map of the 25 brightest stars in Canis Minor. Delta3 Canis Minoris is circled.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Minor
Right ascension 07h 34m 15.89238s[1]
Declination +03° 22′ 18.1956″[1]
Apparent magnitude (V) +5.81[2]
Spectral type B9 V[3]
U−B color index −0.09[2]
B−V color index −0.02[2]
Radial velocity (Rv)33.8±2.9[4] km/s
Proper motion (μ) RA: −2.87[1] mas/yr
Dec.: −6.33[1] mas/yr
Parallax (π)5.67 ± 0.34[1] mas
Distance580 ± 30 ly
(180 ± 10 pc)
Absolute magnitude (MV)+0.77[5]
Mass3.16±0.09[6] M
Radius2.1[7] R
Luminosity175[6] L
Temperature9,908[6] K
Rotational velocity (v sin i)259[6] km/s
Other designations
δ3 CMi, 9 CMi, BD+03° 1719, GC 10128, HD 60357, HIP 36812, HR 2901, SAO 115644, CCDM 07343+0322[8]
Database references

Delta3 Canis Minoris3 Canis Minoris) is a solitary,[9] white-hued star in the equatorial constellation of Canis Minor. Based upon an annual parallax shift of 5.67 mas as seen from Earth,[1] this star is located around 580 light years from the Sun. At that distance, the visual magnitude of these stars is diminished by an extinction of 0.15 due to interstellar dust.[5] With an apparent visual magnitude of +5.81,[2] it is just bright enough to be faintly visible to the naked eye.

This is an B-type main-sequence star with a stellar classification of B9 V.[3] It is about 93.7%±2.9% of the way through its main sequence lifetime and is spinning rapidly with a projected rotational velocity of 259 km/s.[6] The star has an estimated 3.16[6] times the mass of the Sun and about 2.1[7] times the Sun's radius. It is radiating 175 times the Sun's luminosity from its photosphere at an effective temperature of 9,908 K.[6]


  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.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (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. ^ 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.
  5. ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
  6. ^ a b c d e f g 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.
  7. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. ^ "del03 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-03.
  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.