Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 00m 44.461s [1] |
Declination | –10° 26′ 46.06″ [1] |
Apparent magnitude (V) | 5.54 [2] |
Characteristics | |
Spectral type | G8 IV [3] + M4V [4] |
U−B color index | +0.43 [2] |
B−V color index | +0.76 [2] |
Astrometry | |
Radial velocity (Rv) | 0.14±0.14 [1] km/s |
Proper motion (μ) |
RA: 82.841
mas/
yr
[1] Dec.: −482.807 mas/ yr [1] |
Parallax (π) | 78.7565 ± 0.1206 mas [1] |
Distance | 41.41 ± 0.06
ly (12.70 ± 0.02 pc) |
Absolute magnitude (MV) | 5.15±0.009 [5] |
Orbit [4] | |
Period (P) | 48.5 yr |
Semi-major axis (a) | 10.4 AU |
Eccentricity (e) | 0.29 |
Inclination (i) | 35° |
Details | |
A | |
Mass | 0.98 [6] M☉ |
Radius | 1.01 [6] R☉ |
Surface gravity (log g) | 4.43 [6] cgs |
Temperature | 5,538 [3] K |
Metallicity [Fe/H] | 0.18 [7] dex |
Rotational velocity (v sin i) | 4.5 [8] km/s |
Age | 8.48 [6] Gyr |
B | |
Mass | 0.21+0.03 −0.02 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
HD 104304 (24 G. Virginis) is a binary star system in the zodiac constellation Virgo. It has a combined apparent visual magnitude of 5.54, [2] making it visible to the unaided eye under suitable viewing conditions. The system is located at a distance of 41 light-years from the Sun based on parallax measurements. [1] The primary component has a stellar classification of G8 IV, [3] which means that this is a subgiant star that has left the main sequence and has begun to evolve into a giant star. The secondary is a faint red dwarf star with a class of M4V. [4]
In 2007, a candidate planet was announced orbiting the primary. This was updated in 2010 when two independent papers announced the discovery of a common proper motion companion red dwarf. [4] [10] It is believed to have a mass of 0.21 M☉ and spectral type of M4V although the spectrum has not been directly observed. The most likely orbit has a period of 48.5 years and an eccentricity of 0.29. [4] [11] Further measurement will be needed to determine whether the star has a planetary companion, but further companions with masses above 83 MJ and separated by at least 3.9 au can be ruled out. [4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Virgo |
Right ascension | 12h 00m 44.461s [1] |
Declination | –10° 26′ 46.06″ [1] |
Apparent magnitude (V) | 5.54 [2] |
Characteristics | |
Spectral type | G8 IV [3] + M4V [4] |
U−B color index | +0.43 [2] |
B−V color index | +0.76 [2] |
Astrometry | |
Radial velocity (Rv) | 0.14±0.14 [1] km/s |
Proper motion (μ) |
RA: 82.841
mas/
yr
[1] Dec.: −482.807 mas/ yr [1] |
Parallax (π) | 78.7565 ± 0.1206 mas [1] |
Distance | 41.41 ± 0.06
ly (12.70 ± 0.02 pc) |
Absolute magnitude (MV) | 5.15±0.009 [5] |
Orbit [4] | |
Period (P) | 48.5 yr |
Semi-major axis (a) | 10.4 AU |
Eccentricity (e) | 0.29 |
Inclination (i) | 35° |
Details | |
A | |
Mass | 0.98 [6] M☉ |
Radius | 1.01 [6] R☉ |
Surface gravity (log g) | 4.43 [6] cgs |
Temperature | 5,538 [3] K |
Metallicity [Fe/H] | 0.18 [7] dex |
Rotational velocity (v sin i) | 4.5 [8] km/s |
Age | 8.48 [6] Gyr |
B | |
Mass | 0.21+0.03 −0.02 [4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
HD 104304 (24 G. Virginis) is a binary star system in the zodiac constellation Virgo. It has a combined apparent visual magnitude of 5.54, [2] making it visible to the unaided eye under suitable viewing conditions. The system is located at a distance of 41 light-years from the Sun based on parallax measurements. [1] The primary component has a stellar classification of G8 IV, [3] which means that this is a subgiant star that has left the main sequence and has begun to evolve into a giant star. The secondary is a faint red dwarf star with a class of M4V. [4]
In 2007, a candidate planet was announced orbiting the primary. This was updated in 2010 when two independent papers announced the discovery of a common proper motion companion red dwarf. [4] [10] It is believed to have a mass of 0.21 M☉ and spectral type of M4V although the spectrum has not been directly observed. The most likely orbit has a period of 48.5 years and an eccentricity of 0.29. [4] [11] Further measurement will be needed to determine whether the star has a planetary companion, but further companions with masses above 83 MJ and separated by at least 3.9 au can be ruled out. [4]