HR 4587
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 00m 44.45136s[1] |
| Declination | –10° 26′ 45.6527″[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) | 0.4 km/s |
| Proper motion (μ) | RA: 141.75[1] mas/yr Dec.: -483.64[1] mas/yr |
| Parallax (π) | 78.35 ± 0.31[1] mas |
| Distance | 41.6 ± 0.2 ly (12.76 ± 0.05 pc) |
| Details | |
| Mass | 1.01/0.21+0.03 −0.02[4] M☉ |
| Surface gravity (log g) | 4.35[3] cgs |
| Temperature | 5,538[3] K |
| Metallicity [Fe/H] | 0.18[5] dex |
| Rotational velocity (v sin i) | 4.5[6] km/s |
| Age | 8.5[4] Gyr |
| Other designations | |
24 G. Virginis, GJ 454, BD-09°3413, LTT 4476, HD 104304, SAO 157041, HIP 58576. | |
HR 4587 (24 G. Virginis) is a binary star in the zodiac constellation Virgo. It has an apparent magnitude of 5.54, making it visible to the unaided eye under suitable viewing conditions. The stellar classification of G8 IV means that this is a subgiant star that has left the main sequence and has begun to evolve into a giant star. In 2007, a candidate planet was announced orbiting this star. This was updated in 2011 when the companion was found to be a star. It is believed to have a mass of 0.21 solar masses (83 Jupiters), an orbital period of 17,715 days with an eccentricity of 0.29.[4][7] Further measurement will be needed to determine whether the star has a planetary companion.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ↑ 2.0 2.1 2.2 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode:1966CoLPL...4...99J
- ↑ 3.0 3.1 3.2 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637
- ↑ 4.0 4.1 4.2 4.3 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
- ↑ 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.; Reiners, J. H. M. M.; Schmitt (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
- ↑ Schneider, Jean, "Star : HD 104304", Extrasolar Planets Encyclopaedia (CNRS/LUTH - Paris Observatory), retrieved 2011-12-21
External links
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