Omicron Arietis

Omicron Arietis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension 02h 44m 32.97317s[1]
Declination +15° 18′ 42.7085″[1]
Apparent magnitude (V) +5.78[2]
Characteristics
Spectral type B9 Vn[3]
U−B color index −0.21[4]
B−V color index −0.01[4]
Astrometry
Radial velocity (Rv)−2.4±3.3[5] km/s
Proper motion (μ) RA: +3.25[1] mas/yr
Dec.: −14.87[1] mas/yr
Parallax (π)5.49 ± 0.32 mas[1]
Distance590 ± 30 ly
(180 ± 10 pc)
Absolute magnitude (MV)−0.51[6]
Details
Mass3.45±0.09[7] M☉
Radius3.1[8] R☉
Luminosity248[7] L☉
Temperature10,715[7] K
Rotational velocity (v sin i)225[9] km/s
Age286[10] Myr
Other designations
ο Ari, 37 Arietis, BD+14° 457, HD 17036, HIP 12803, HR 809, SAO 93082[11]
Database references
SIMBADdata

Omicron Arietis, Latinised from ο Arietis, is the Bayer designation for a single,[2] blue-white-hued star in the northern constellation of Aries. It has an apparent visual magnitude of +5.78,[2] which means it is dimly visible to the naked eye. Based upon an annual parallax shift of 5.49 mas as seen from Earth,[1] it is located roughly 590 light-years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.22 due to interstellar dust.[10]

This is a B-type main-sequence star with a stellar classification of B9 Vn.[3] The 'n' suffix indicates that it has nebulous absorption lines in its spectrum, which are caused by the Doppler effect and rapid rotation. Indeed, it has a projected rotational velocity of 225 km/s.[9] The star has an estimated 3.45[7] times the mass of the Sun and about 3.1[8] times the Sun's radius. It is radiating energy from its photosphere at 248 times the Sun's luminosity with an effective temperature of 10,715 K.[7]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1972 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Crawford1963 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).