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]
| 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 |
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]
References
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