HD 104304

Binary star in the constellation Virgo From Wikipedia, the free encyclopedia

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,[3] 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.[2] The primary component has a stellar classification of G8 IV,[4] 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.[5]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
HD 104304
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo[1]
Right ascension 12h 00m 44.461s[2]
Declination −10° 26 46.06[2]
Apparent magnitude (V) 5.54[3]
Characteristics
Spectral type G8 IV[4] + M4V[5]
U−B color index +0.43[3]
B−V color index +0.76[3]
Astrometry
Radial velocity (Rv)0.14±0.14[2] km/s
Proper motion (μ) RA: +82.841 mas/yr[2]
Dec.: −482.807 mas/yr[2]
Parallax (π)78.7565±0.1206 mas[2]
Distance41.41 ± 0.06 ly
(12.70 ± 0.02 pc)
Absolute magnitude (MV)5.15±0.009[6]
Orbit[5]
Period (P)48.5 yr
Semi-major axis (a)10.4 AU
Eccentricity (e)0.29
Inclination (i)35°
Details
A
Mass0.98[7] M
Radius1.01[7] R
Surface gravity (log g)4.43[7] cgs
Temperature5,538[4] K
Metallicity [Fe/H]0.18[8] dex
Rotational velocity (v sin i)4.5[9] km/s
Age8.48[7] Gyr
B
Mass0.21+0.03
−0.02
[5] M
Other designations
BD−09°3413, GJ 454, HD 104304, HIP 58576, HR 4587, SAO 157041, G 24 G. Virginis, LTT 4476[10]
Database references
SIMBADdata
Close

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.[5][11] 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.[5][12] 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.[5]

References

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