HD 104304
| 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] | |
| Absolute magnitude (MV) | 5.15±0.009[5] | |
Inclination (i) | 35° | |
| Details | ||
| A | ||
Gyr | ||
| B | ||
| Mass | 0.21+0.03 −0.02[4] M☉ | |
LTT 4476[9] | ||
| Database references | ||
| SIMBAD | data | |
HD 104304 (24 G. Virginis) 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]
References
- ^ .
- ^ Bibcode:1966CoLPL...4...99J
- ^ S2CID 119476992
- ^ S2CID 54984741
- S2CID 119187733.
- ^ S2CID 18775378.
- Bibcode:1972MmRAS..77...55H
- ]
- ^ "HD 104304". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-11.
- S2CID 118459054.
- ^ Schneider, Jean, "Star : HD 104304", Extrasolar Planets Encyclopaedia, archived from the original on November 13, 2007, retrieved 2011-12-21
