Astronomy:HD 75063

From HandWiki
HD 75063
Observation data
Equinox J2000.0]] (ICRS)
Constellation Vela
Right ascension  08h 46m 01.64391s[1]
Declination −46° 02′ 29.5042″[1]
Apparent magnitude (V) 3.87[2]
Spectral type A1III[3] or A0 II[4]
B−V color index 0.015±0.029[2]
Radial velocity (Rv)+23.2±0.3[2] km/s
Proper motion (μ) RA: −12.82[1] mas/yr
Dec.: +4.23[1] mas/yr
Parallax (π)1.76 ± 0.14[1] mas
Distance1,900 ± 100 ly
(570 ± 50 pc)
Absolute magnitude (MV)−4.89[2]
Mass8.6±0.3[5] M
Radius4.5[6] R
Luminosity8,669.71[2] L
Temperature8,023[7] K
Rotational velocity (v sin i)30[8] km/s
Age30.6±2.6[5] Myr
Other designations
a Vel, CD–45°4517, HD 75063, HIP 43023, HR 3487, SAO 220422[9]
Database references

HD 75063 is a single[10] star in the southern constellation of Vela. It has the Bayer designation of a Velorum, while HD 75063 is the identifier from the Henry Draper catalogue. This is a naked eye star with an apparent visual magnitude of 3.87[2] and has a white hue. The star is located at a distance of approximately 1,900 light years from the Sun based on parallax measurements and has an absolute magnitude of −4.89.[2] It is drifting further away with a radial velocity of +23 km/s.[2]

This object has been stellar classifications of A1III[3] and A0 II,[4] matching a massive A-type giant or bright giant star, respectively. It is an estimated 31[5] million years old and is spinning with a projected rotational velocity of 30 km/s.[8] The star has 8.6[5] times the mass of the Sun and around 4.5[6] times the Sun's radius. The star is radiating 8,670[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,023 K.[7]


  1. 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode2007A&A...474..653V.  Vizier catalog entry
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Levato, O. H. (August 1972). "Rotational Velocities and Spectral Types of Some A-Type Stars". Publications of the Astronomical Society of the Pacific 84 (500): 584. doi:10.1086/129336. Bibcode1972PASP...84..584L. 
  4. 4.0 4.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 2. Ann Arbor: Dept. of Astronomy, University of Michigan. 
  5. 5.0 5.1 5.2 5.3 Tetzlaff, N. et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode2011MNRAS.410..190T. 
  6. 6.0 6.1 Pasinetti Fracassini, L. E. et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics 367 (2): 521–524. doi:10.1051/0004-6361:20000451. Bibcode2001A&A...367..521P. 
  7. 7.0 7.1 McDonald, I. et al. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427: 343. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode2012MNRAS.427..343M. 
  8. 8.0 8.1 Royer, F. et al. (May 2002). "Rotational velocities of A-type stars II. Measurement of vsini in the northern hemisphere". Astronomy & Astrophysics 393: 897-912. Bibcode2002A&A...393..897R. 
  9. "a Vel". SIMBAD. Centre de données astronomiques de Strasbourg. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode2008MNRAS.389..869E.