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] |
Distance | 470 ± 10 ly (143 ± 3 pc) |
Absolute magnitude (MV) | -0.87[6] |
Details | |
A | |
Mass | 3.42±0.11[3] M☉ |
Radius | 2.81[7] R☉ |
Luminosity | 268+72 −57[3] L☉ |
Temperature | 10,910±420[9] K |
Rotational velocity (v sin i) | 85±13[7] km/s |
B | |
Radius | 2.2[7] R☉ |
Rotational velocity (v sin i) | 180±29[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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]
GaiaDR2
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was invoked but never defined (see the help page).Howe2009
was invoked but never defined (see the help page).corbally1984
was invoked but never defined (see the help page).Zorec2009
was invoked but never defined (see the help page).SIMBAD
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