HD 27894
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Reticulum |
| Right ascension | 04h 20m 47.04716s[1] |
| Declination | –59° 24′ 39.0184″[1] |
| Apparent magnitude (V) | 9.42 |
| Characteristics | |
| Spectral type | K2 V[2] |
| U−B color index | +0.90[3] |
| B−V color index | +1.005[3] |
| Astrometry | |
| Proper motion (μ) | RA: +182.16[1] mas/yr Dec.: +271.77[1] mas/yr |
| Parallax (π) | 22.79 ± 0.85[1] mas |
| Distance | 143 ± 5 ly (44 ± 2 pc) |
| Details | |
| Mass | 0.86 ± 0.06[4] M☉ |
| Surface gravity (log g) | 4.54 ± 0.05[4] cgs |
| Temperature | 4920 ± 45[4] K |
| Metallicity [Fe/H] | +0.20[5] dex |
| Age | 7.7 ± 2.3[4] years |
| Other designations | |
HD 27894 is a 9th magnitude star located approximately 138 light years away in the constellation of Reticulum. It is an orange dwarf (spectral type K2V), a type dimmer and cooler than our Sun.
In 2005, the Geneva Extrasolar Planet Search Team announced some of the discoveries of an extrasolar planet orbiting the star.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.62 MJ | 0.122 | 17.991 ± 0.007 | 0.049 ± 0.008 | — | — |
See also
References
- 1 2 3 4 5 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
- ↑ Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
- 1 2 3 "LTT 1953 -- High proper-motion Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-02-05
- 1 2 3 4 Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056. See table 13.
- ↑ Sousa, S. G.; et al. (August 2008), "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes", Astronomy and Astrophysics 487 (1): 373–381, arXiv:0805.4826, Bibcode:2008A&A...487..373S, doi:10.1051/0004-6361:200809698
- 1 2 Moutou, C.; et al. (2005). "The HARPS search for southern extra-solar planets IV. Three close-in planets around HD 2638, HD 27894 and HD 63454". Astronomy and Astrophysics 439 (1): 367–373. Bibcode:2005A&A...439..367M. doi:10.1051/0004-6361:20052826.
External links
Coordinates: 
04h 20m 47.0473s, −59° 24′ 39.014″
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