Astronomy:HD 104304
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas/yr Dec.: −482.807[2] mas/yr |
| Parallax (π) | 78.7565 ± 0.1206[2] mas |
| Distance | 41.41 ± 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 astronomical unit|AU |
| Eccentricity (e) | 0.29 |
| Inclination (i) | 35° |
| Details | |
| A | |
| Mass | 0.98[7] M☉ |
| Radius | 1.01[7] R☉ |
| Surface gravity (log g) | 4.43[7] cgs |
| Temperature | 5,538[4] K |
| Metallicity [Fe/H] | 0.18[8] dex |
| Rotational velocity (v sin i) | 4.5[9] km/s |
| Age | 8.48[7] Gyr |
| B | |
| Mass | 0.21+0.03 −0.02[5] M☉ |
| Other designations | |
| 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,[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]
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 |♃|J}}}}}} and separated by at least 3.9 au can be ruled out.[5]
References
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 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
- ↑ 4.0 4.1 4.2 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Schnupp, C. et al. (June 2010), "Discovery of a stellar companion to the nearby solar-analogue HD 104304", Astronomy and Astrophysics 516: A21, doi:10.1051/0004-6361/201014740, Bibcode: 2010A&A...516A..21S
- ↑ Park, Sunkyung et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal 146 (4): 73, doi:10.1088/0004-6256/146/4/73, Bibcode: 2013AJ....146...73P.
- ↑ 7.0 7.1 7.2 7.3 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. doi:10.1086/509763. Bibcode: 2007ApJS..168..297T.
- ↑ 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, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2
- ↑ "HD 104304". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+104304.
- ↑ 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, doi:10.1086/656481, Bibcode: 2010PASP..122.1195T.
- ↑ Schneider, Jean, Star : HD 104304, http://exoplanet.eu/star.php?st=HD+104304, retrieved 2011-12-21
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