Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Lupus |
Right ascension | 14h 51m 38.30289s [1] |
Declination | −43° 34′ 31.2965″ [1] |
Apparent magnitude (V) | 4.323 [2] (4.84 + 5.27) [3] |
Characteristics | |
Spectral type | B5 IV [3] |
U−B color index | −0.620 [2] |
B−V color index | −0.159 [2] |
Astrometry | |
Radial velocity (Rv) | +7.30±0.74 [4] km/s |
Proper motion (μ) |
RA: −25.20
[1]
mas/
yr Dec.: −27.13 [1] mas/ yr |
Parallax (π) | 8.07 ± 0.59 mas [1] |
Distance | 400 ± 30
ly (124 ± 9 pc) |
Absolute magnitude (MV) | −1.2±0.3 [5] |
Details | |
Mass | 5.7±0.2 [5] M☉ |
Radius | 3.5 [5] R☉ |
Luminosity | 1,260 [5] L☉ |
Surface gravity (log g) | 4.1±0.1 [5] cgs |
Temperature | 18,000 [6] K |
Rotational velocity (v sin i) | 25 [6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Omicron Lupi (ο Lup) is a binary star [3] in the southern constellation of Lupus. It is a visible to the naked eye with a combined apparent visual magnitude of 4.323. [2] Based upon an annual parallax shift of 8.07 mas as seen from Earth, [1] it is located around 400 light-years from the Sun, give or take 30 light-years. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.13±0.01 due to interstellar dust. [5] It is a member of the Upper Centaurus–Lupus [8] subgroup of the nearby Scorpius–Centaurus association. [6]
This is a visual binary star system with the components having an angular separation of 0.1 arcsecond. [8] The primary, component A, is a magnitude 4.84 B-type subgiant star with a stellar classification of B5 V. [3] It displays radial velocity variations indicating it has an unseen second companion orbiting at a separation of at least 17 AU with a period of 27 years or more. [6] The spectrum of the primary displays a Zeeman effect indicating a magnetic field with a strength ranging from −94 to 677 G. [6] The visible companion, component B, has a visual magnitude of 5.27. [3]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Lupus |
Right ascension | 14h 51m 38.30289s [1] |
Declination | −43° 34′ 31.2965″ [1] |
Apparent magnitude (V) | 4.323 [2] (4.84 + 5.27) [3] |
Characteristics | |
Spectral type | B5 IV [3] |
U−B color index | −0.620 [2] |
B−V color index | −0.159 [2] |
Astrometry | |
Radial velocity (Rv) | +7.30±0.74 [4] km/s |
Proper motion (μ) |
RA: −25.20
[1]
mas/
yr Dec.: −27.13 [1] mas/ yr |
Parallax (π) | 8.07 ± 0.59 mas [1] |
Distance | 400 ± 30
ly (124 ± 9 pc) |
Absolute magnitude (MV) | −1.2±0.3 [5] |
Details | |
Mass | 5.7±0.2 [5] M☉ |
Radius | 3.5 [5] R☉ |
Luminosity | 1,260 [5] L☉ |
Surface gravity (log g) | 4.1±0.1 [5] cgs |
Temperature | 18,000 [6] K |
Rotational velocity (v sin i) | 25 [6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Omicron Lupi (ο Lup) is a binary star [3] in the southern constellation of Lupus. It is a visible to the naked eye with a combined apparent visual magnitude of 4.323. [2] Based upon an annual parallax shift of 8.07 mas as seen from Earth, [1] it is located around 400 light-years from the Sun, give or take 30 light-years. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.13±0.01 due to interstellar dust. [5] It is a member of the Upper Centaurus–Lupus [8] subgroup of the nearby Scorpius–Centaurus association. [6]
This is a visual binary star system with the components having an angular separation of 0.1 arcsecond. [8] The primary, component A, is a magnitude 4.84 B-type subgiant star with a stellar classification of B5 V. [3] It displays radial velocity variations indicating it has an unseen second companion orbiting at a separation of at least 17 AU with a period of 27 years or more. [6] The spectrum of the primary displays a Zeeman effect indicating a magnetic field with a strength ranging from −94 to 677 G. [6] The visible companion, component B, has a visual magnitude of 5.27. [3]