Astronomy:HD 74272

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HD 74272
Observation data
Equinox J2000.0]] (ICRS)
Constellation Vela
Right ascension  08h 41m 13.12966s[1]
Declination −47° 19′ 01.6610″[1]
Apparent magnitude (V) 4.74[2]
Spectral type A5 II[3]
B−V color index 0.137±0.029[2]
Radial velocity (Rv)+17.4±2.8[2] km/s
Proper motion (μ) RA: −8.228[1] mas/yr
Dec.: +10.051[1] mas/yr
Parallax (π)1.7639 ± 0.1441[1] mas
Distance1,800 ± 200 ly
(570 ± 50 pc)
Absolute magnitude (MV)−4.67[2]
Mass8.8±0.1[4] M
[1] R
Luminosity3,287±312[1] L
[1] K
Rotational velocity (v sin i)[5] km/s
Age29.8±3.4[4] Myr
Other designations
n Vel, CD−46°4448, FK5 2570, HD 74272, HIP 42624, HR 3452, SAO 220284[6]
Database references

HD 74272 is a star in the constellation Vela. It has the Bayer designation n Velorum, while HD 74272 is the identifier from the Henry Draper catalogue. This is a white hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.74.[2] It is located at a distance of approximately 1,800 light years from the Sun based on parallax.[1] The star is drifting further away with a radial velocity of +17 km/s.[2]

This is an aging, massive bright giant star with a stellar classification of A5 II.[3] It is an estimated 30 million years old with 8.8 times the mass of the Sun.[4] Having exhausted the supply of hydrogen at its core, it has expanded to around 33[1] times the radius of the Sun. The star is radiating 3,287[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 7,595 K.[1]


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 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 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, 
  4. 4.0 4.1 4.2 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 
  5. Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), 
  6. "n Vel". SIMBAD. Centre de données astronomiques de Strasbourg.