Delta3 Canis Minoris

Delta3 Canis Minoris, Latinized from δ3 Canis Minoris, is a solitary,[10] white-hued star in the equatorial constellation of Canis Minor. Based upon a parallax of 4.46 mas as seen from Gaia spacecraft in its repeated orbits around the sun, just beyond the earth this star is about 730 light years from the solar system. At that distance, the visual magnitude of these stars is diminished by an extinction of more than 0.15 due to interstellar dust.[6] With an apparent visual magnitude of +5.81,[2] it is just bright enough to be faintly visible to the naked eye.

For other stars with this Bayer designation, see δ Canis Minoris.
δ3 Canis Minoris
Location of δ3 Canis Minoris (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]
Characteristics
Spectral type B9 V[3]
U−B color index −0.09[2]
B−V color index −0.02[2]
Astrometry
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)4.4602 ± 0.1061[5] mas
Distance730 ± 20 ly
(224 ± 5 pc)
Absolute magnitude (MV)+0.77[6]
Details
Mass3.16±0.09[7] M☉
Radius2.1[8] R☉
Luminosity175[7] L☉
Temperature9,908[7] K
Rotational velocity (v sin i)259[7] km/s
Age310[6] Myr
Other designations
δ3 CMi, 9 CMi, BD+03°1719, GC 10128, HD 60357, HIP 36812, HR 2901, SAO 115644, CCDM 07343+0322[9]
Database references
SIMBADdata

This is a 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.[7] The star has an estimated 3.16[7] times the mass of the Sun and about 2.1[8] 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.[7]

References
  1. 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. 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. 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. 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. 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.
  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.
  8. 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.
  9. "del03 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-03.
  10. 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.
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