Omega Fornacis

Omega Fornacis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Fornax
Right ascension 2h 33m 50.70081s[1]
Declination –28° 13′ 56.3890″[1]
Apparent magnitude (V) 4.95 + 7.71[2]
Characteristics
A
Evolutionary stage main sequence[3]
Spectral type B9V[4]
U−B color index −0.13[5]
B−V color index −0.050±0.007[6]
R−I color index −0.07[5]
B
Spectral type A3V[7]
U−B color index +0.09[8]
B−V color index +0.17[8]
Astrometry
Radial velocity (Rv)+9.7±2.8[6] km/s
Proper motion (μ) RA: −13.290±0.243[1] mas/yr
Dec.: −5.532±0.305[1] mas/yr
Parallax (π)7.0025 ± 0.1527 mas[1]
Distance470 ± 10 ly
(143 ± 3 pc)
Absolute magnitude (MV)-0.87[6]
Details
A
Mass3.42±0.11[3] M☉
Radius2.81[7] R☉
Luminosity268+72
−57[3] L☉
Temperature10,910±420[9] K
Rotational velocity (v sin i)85±13[7] km/s
B
Radius2.2[7] R☉
Rotational velocity (v sin i)180±29[7] km/s
Other designations
ω For, CD–28°819, HD 16046, HIP 11918, HR 749, SAO 167882, CCDM J02338-2814AB, WDS J02338-2814[10]
Database references
SIMBADdata

Omega Fornacis, which is Latinized from ω Fornacis, is a wide binary star[11] system in the southern constellation of Fornax. It has a blue-white hue and is faintly visible to the naked eye as a fifth-magnitude star.[6] The system lies at a distance of approximately 470 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +10 km/s.[6]

The dual nature of this system was discovered in 1836 by John Herschel. As of 2013, the two components had an angular separation of 11.0″ along a position angle of 246°.[2] This corresponds to a projected separation of 1,520 AU.[7]

The magnitude 4.95[2] primary, designated component A, is a chemically peculiar[3] B-type main-sequence star with a stellar classification of B9V[4] It has 3.4[3] times the Sun's mass and is radiating around 268[3] times the luminosity of the Sun from its photosphere at an effective temperature of 10,910 K.[9] Component B, the magnitude 7.71[2] secondary, is an A-type main-sequence star with a class of A3V.[7] It is smaller than the primary, but has a higher projected rotational velocity.[7]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f g h Cite error: The named reference Howe2009 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference corbally1984 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Zorec2009 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).