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]
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]