HD 104304

HD 104304
Observation data; Epoch J2000 Equinox ICRS
Constellation	Virgo
Right ascension	12h 00m 44.461s
Declination	−10° 26′ 46.06″
Apparent magnitude (V)	5.54
Characteristics
Spectral type	G8 IV + M4V
U−B color index	+0.43
B−V color index	+0.76
Astrometry
Radial velocity (Rv)	0.14±0.14 km/s
Proper motion (μ)	RA: +82.841 mas/yr ; Dec.: −482.807 mas/yr
Parallax (π)	78.7565±0.1206 mas
Distance	41.41 ± 0.06 ly ; (12.70 ± 0.02 pc)
Absolute magnitude (MV)	5.15±0.009
Orbit
Period (P)	92.9+4.8; −4.2 yr
Semi-major axis (a)	22.85+0.87; −0.79 AU
Eccentricity (e)	0.400±0.025
Inclination (i)	25.93+0.68; −0.58°
Details
A
Mass	1.061±0.053 M☉
Radius	1.01 R☉
Surface gravity (log g)	4.43 cgs
Temperature	5,538 K
Metallicity [Fe/H]	0.18 dex
Rotational velocity (v sin i)	4.5 km/s
Age	8.48 Gyr
B
Mass	0.321+0.014; −0.013 M☉
Other designations
	24 G. Virginis, BD−09°3413, GJ 454, HD 104304, HIP 58576, HR 4587, SAO 157041, LTT 4476
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, 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. The primary component has a stellar classification of G8 IV, 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.

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. It has a mass of 0.321 M_☉ and spectral type of M4V although the spectrum has not been directly observed. The components orbit around the center of mass with a period of 92.9 years and an eccentricity of 0.400. Further measurement will be needed to determine whether the star has a planetary companion, but further companions with masses above 83 M_J and separated by at least 3.9 au can be ruled out.

References

↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
1 2 3 4 5 6 7 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
1 2 3 4 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
1 2 3 Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992
1 2 3 4 Schnupp, C.; et al. (June 2010), "Discovery of a stellar companion to the nearby solar-analogue HD 104304", Astronomy and Astrophysics, 516: A21, arXiv:1005.0620, Bibcode:2010A&A...516A..21S, doi:10.1051/0004-6361/201014740, S2CID 54984741
↑ Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal, 146 (4): 73, arXiv:1307.0592, Bibcode:2013AJ....146...73P, doi:10.1088/0004-6256/146/4/73, S2CID 119187733.
1 2 3 4 5 An, Qier; Brandt, Timothy D.; Brandt, G. Mirek; Venner, Alexander (October 2025), "Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and a Validation of Gaia Non-single-star Solutions", The Astrophysical Journal Supplement Series, 280 (2): 61, arXiv:2508.08374, Bibcode:2025ApJS..280...61A, doi:10.3847/1538-4365/adfa99, ISSN 0067-0049.
1 2 3 Takeda, Genya; et al. (2007). "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog". The Astrophysical Journal Supplement Series. 168 (2): 297. arXiv:astro-ph/0607235. Bibcode:2007ApJS..168..297T. doi:10.1086/509763. S2CID 18775378.
↑ Hearnshaw, J. B. (1972), "The abundances of the elements in the oldest disk stars", Memoirs of the Royal Astronomical Society, 77: 55, Bibcode:1972MmRAS..77...55H
↑ Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
↑ "HD 104304". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-11.
↑ Tanner, Angelle M.; et al. (2010), "A High-Contrast Imaging Survey of SIM Lite Planet Search Targets", Publications of the Astronomical Society of the Pacific, 122 (896): 1195, arXiv:1007.4315, Bibcode:2010PASP..122.1195T, doi:10.1086/656481, S2CID 118459054.

[xhip-1] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.

[GaiaDR2-2] 1 2 3 4 5 6 7 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[clpl4_99-3] 1 2 3 4 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J

[aj132_1_161-4] 1 2 3 Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992

[aaa516-5] 1 2 3 4 Schnupp, C.; et al. (June 2010), "Discovery of a stellar companion to the nearby solar-analogue HD 104304", Astronomy and Astrophysics, 516: A21, arXiv:1005.0620, Bibcode:2010A&A...516A..21S, doi:10.1051/0004-6361/201014740, S2CID 54984741

[park2013-6] Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal, 146 (4): 73, arXiv:1307.0592, Bibcode:2013AJ....146...73P, doi:10.1088/0004-6256/146/4/73, S2CID 119187733.

[An2025-7] 1 2 3 4 5 An, Qier; Brandt, Timothy D.; Brandt, G. Mirek; Venner, Alexander (October 2025), "Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and a Validation of Gaia Non-single-star Solutions", The Astrophysical Journal Supplement Series, 280 (2): 61, arXiv:2508.08374, Bibcode:2025ApJS..280...61A, doi:10.3847/1538-4365/adfa99, ISSN 0067-0049.

[takeda-8] 1 2 3 Takeda, Genya; et al. (2007). "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog". The Astrophysical Journal Supplement Series. 168 (2): 297. arXiv:astro-ph/0607235. Bibcode:2007ApJS..168..297T. doi:10.1086/509763. S2CID 18775378.

[mras77_55-9] Hearnshaw, J. B. (1972), "The abundances of the elements in the oldest disk stars", Memoirs of the Royal Astronomical Society, 77: 55, Bibcode:1972MmRAS..77...55H

[aaa493_3_1099-10] Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377

[SIMBAD-11] "HD 104304". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-11.

[tanner-12] Tanner, Angelle M.; et al. (2010), "A High-Contrast Imaging Survey of SIM Lite Planet Search Targets", Publications of the Astronomical Society of the Pacific, 122 (896): 1195, arXiv:1007.4315, Bibcode:2010PASP..122.1195T, doi:10.1086/656481, S2CID 118459054.