HD 104304

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]
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]
Distance41.41 ± 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
Mass0.98[6] M☉
Radius1.01[6] R☉
Surface gravity (log g)4.43[6] cgs
Temperature5,538[3] K
Metallicity [Fe/H]0.18[7] dex
Rotational velocity (v sin i)4.5[8] km/s
Age8.48[6] Gyr
B
Mass0.21+0.03
−0.02[4] M☉
Other designations
BD−09°3413, GJ 454, HD 104304, HIP 58576, HR 4587, SAO 157041, G 24 G. Virginis, LTT 4476[9]
Database references
SIMBADdata

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]

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  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference aaa516 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference park2013 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference takeda was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference mras77_55 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa493_3_1099 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference tanner was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference epe was invoked but never defined (see the help page).