Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Grus |
Right ascension | 23h 26m 36.57748s [1] |
Declination | −52° 43′ 17.7656″ [1] |
Apparent magnitude (V) | 5.52 [2] |
Characteristics | |
Spectral type | F4 V [3] + M3/M4 [4] |
B−V color index | +0.40 [2] |
Variable type | δ Sct [5] |
Astrometry | |
Proper motion (μ) |
RA: +34.52
[1]
mas/
yr Dec.: +130.66 [1] mas/ yr |
Parallax (π) | 32.50 ± 0.37 mas [1] |
Distance | 100 ± 1
ly (30.8 ± 0.4 pc) |
Absolute magnitude (MV) | 3.01 [6] |
Details | |
ο Gru A | |
Mass | 1.31 [7] M☉ |
Surface gravity (log g) | 4.19 [7] cgs |
Temperature | 6,763±230 [7] K |
Metallicity [Fe/H] | –0.10 [3] dex |
Rotational velocity (v sin i) | 20.4±0.3 [6] km/s |
Age | 1.026 [7] Gyr |
ο Gru B | |
Mass | 0.3 [4] M☉ |
Age | 1.1 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ο Gruis, Latinised as Omicron Gruis, is a binary or triple star [4] system in the southern constellation of Grus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.52. [2] Based upon an annual parallax shift of 32.50 mas as seen from the Earth, [1] the system is located 100 light years from the Sun.
The pair form a close spectroscopic binary system with a physical separation of about 14.9 astronomical units. [4] The primary component is an F-type main sequence star with a stellar classification of F4 V, [3] a star that is currently fusing its core hydrogen. It is a probable delta scuti variable showing periodicities of 4.7 and 5.5 cycles per day with amplitudes of 0.014 and 0.011 magnitudes, respectively. [5] The secondary companion is a red dwarf with a mass of about 0.3 solar, suggesting a class of M3/M4. [4] Ehrenreich et al. (2010) noted the detection of a tertiary companion that is not causing the detected radial velocity shifts which would make this a triple star system. [4]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Grus |
Right ascension | 23h 26m 36.57748s [1] |
Declination | −52° 43′ 17.7656″ [1] |
Apparent magnitude (V) | 5.52 [2] |
Characteristics | |
Spectral type | F4 V [3] + M3/M4 [4] |
B−V color index | +0.40 [2] |
Variable type | δ Sct [5] |
Astrometry | |
Proper motion (μ) |
RA: +34.52
[1]
mas/
yr Dec.: +130.66 [1] mas/ yr |
Parallax (π) | 32.50 ± 0.37 mas [1] |
Distance | 100 ± 1
ly (30.8 ± 0.4 pc) |
Absolute magnitude (MV) | 3.01 [6] |
Details | |
ο Gru A | |
Mass | 1.31 [7] M☉ |
Surface gravity (log g) | 4.19 [7] cgs |
Temperature | 6,763±230 [7] K |
Metallicity [Fe/H] | –0.10 [3] dex |
Rotational velocity (v sin i) | 20.4±0.3 [6] km/s |
Age | 1.026 [7] Gyr |
ο Gru B | |
Mass | 0.3 [4] M☉ |
Age | 1.1 [4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
ο Gruis, Latinised as Omicron Gruis, is a binary or triple star [4] system in the southern constellation of Grus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.52. [2] Based upon an annual parallax shift of 32.50 mas as seen from the Earth, [1] the system is located 100 light years from the Sun.
The pair form a close spectroscopic binary system with a physical separation of about 14.9 astronomical units. [4] The primary component is an F-type main sequence star with a stellar classification of F4 V, [3] a star that is currently fusing its core hydrogen. It is a probable delta scuti variable showing periodicities of 4.7 and 5.5 cycles per day with amplitudes of 0.014 and 0.011 magnitudes, respectively. [5] The secondary companion is a red dwarf with a mass of about 0.3 solar, suggesting a class of M3/M4. [4] Ehrenreich et al. (2010) noted the detection of a tertiary companion that is not causing the detected radial velocity shifts which would make this a triple star system. [4]