58 Eridani
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 47m 36.29s[1] |
| Declination | –16° 56′ 04.0″[1] |
| Apparent magnitude (V) | 5.50 |
| Characteristics | |
| Spectral type | G3 V |
| U−B color index | 0.14 |
| B−V color index | 0.63 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | +16.8 km/s |
| Proper motion (μ) | RA: 130.04 ± 0.37[1] mas/yr Dec.: 169.27 ± 0.28[1] mas/yr |
| Parallax (π) | 75.32 ± 0.36[1] mas |
| Distance | 43.3 ± 0.2 ly (13.28 ± 0.06 pc) |
| Absolute magnitude (MV) | 5.01 |
| Details | |
| Mass | 0.96 M☉ |
| Radius | 0.96 R☉ |
| Luminosity | 0.96 L☉ |
| Temperature | 5,820 ± 5.7[2] K |
| Metallicity [Fe/H] | 0.00[3] dex |
| Rotation | 7.6 days[3] |
| Rotational velocity (v sin i) | 4 km/s |
| Age | 600[4] Myr |
| Other designations | |
58 Eridani is a main sequence star in the constellation Eridanus. It is considered a solar analogue,[5] which means it has similar physical properties to the Sun. The star has a relatively high proper motion across the sky, and it is located about 44 light years distant. It is a probable member of the IC 2391 moving group of stars that share a common motion through space.[3]
The X-ray emissions from this star's corona indicate an age of less than a billion (109) years,[6] compared to 4.6 billion for the Sun, so it is still relatively young for a star of its mass. Starspot activity has also been detected, which varies from year to year.
A circumstellar disc of dust particles has been detected in orbit around 58 Eridani.[7]
[edit] See also
[edit] References
- ^ a b c d e van Leeuwen, F. (2007), "HIP 22263", Hipparcos, the New Reduction, http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=22209, retrieved 2009-12-11
- ^ Kovtyukh et al. (2003), "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios", Astronomy and Astrophysics 411 (3): 559–564, arXiv:astro-ph/0308429, Bibcode 2003A&A...411..559K, doi:10.1051/0004-6361:20031378
- ^ a b c Maldonado, J. et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics 521: A12, Bibcode 2010A&A...521A..12M, doi:10.1051/0004-6361/201014948
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal 687 (2): 1264–1293, Bibcode 2008ApJ...687.1264M, doi:10.1086/591785
- ^ E.J. Gaidos, G.W. Henry, S.M. Henry (2000). "Spectroscopy and Photometry of Nearby Young Solar Analogs". Astronomical Journal 120 (2): 1006–1013. Bibcode 2000AJ....120.1006G. doi:10.1086/301488.
- ^ E.J. Gaidos, G. Gonzalez (2002). "Stellar Atmospheres of Nearby Young Solar Analogs". New Astronomy 7 (5): 211–226. arXiv:astro-ph/0203518. Bibcode 2002astro.ph..3518G. doi:10.1016/S1384-1076(02)00108-2.
- ^ E. Gaidos, C. Koresko (2004). "A Survey of 10-Micron Silicate Emission from Dust around Young Sun-Like Stars". New Astronomy 93 (1): 33–42. Bibcode 1999JRASC..93..122F. doi:10.1016/j.newast.2003.07.002.
[edit] External links
- "58 Eridani". SolStation. http://www.solstation.com/stars2/58eri.htm. Retrieved 2006-07-28.
- "Gl 177". ARICNS. 2006-06-06. http://www.ari.uni-heidelberg.de/aricns/cnspages/4c00400.htm. Retrieved 2006-06-08.[dead link]
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