HD 27894

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
Distance143 ± 5 ly
(44 ± 2 pc)
Details
Mass0.86 ± 0.06[4] M☉
Surface gravity (log g)4.54 ± 0.05[4] cgs
Temperature4920 ± 45[4] K
Metallicity [Fe/H]+0.20[5] dex
Age7.7 ± 2.3[4] years
Other designations
CD-59 829, HD 27894, HIP 20277, LTT 1953.[3]

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 the discovery of an extrasolar planet orbiting the star.[6]

The HD 27894 planetary system[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. ↑ 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. ↑ 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
  3. ↑ 3.0 3.1 3.2 "LTT 1953 -- High proper-motion Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-02-05
  4. ↑ 4.0 4.1 4.2 4.3 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.
  5. ↑ 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
  6. ↑ 6.0 6.1 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″