HD 2638

HD 2638
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 00h 29m 59.87s[1]
Declination –05° 45 50.4[1]
Apparent magnitude (V) 9.8
Characteristics
Spectral type G5V
Astrometry
Proper motion (μ) RA: –105.63 ± 1.74[1] mas/yr
Dec.: –223.46 ± 1.0[1] mas/yr
Parallax (π)20.03 ± 1.49[1] mas
Distance160 ± 10 ly
(50 ± 4 pc)
Details
Mass0.90 ± 0.10[2] M
Radius0.80 ± 0.09[2] R
Luminosity0.43[2] L
Surface gravity (log g)4.38 ± 0.19[2] cgs
Temperature5,236 ± 70[2] K
Metallicity [Fe/H]0.22 ± 0.05[2] dex
Other designations
BD-06°82, HD 2638, HIP 2350
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

HD 2638 is a dim 10th magnitude star in the constellation of Cetus. It is a yellow dwarf and similar to our Sun. A small telescope is required to view the star.

Planetary system

In 2005 the discovery of an extrasolar planet HD 2638 b orbiting the star was announced by the Geneva Extrasolar Planet Search Team.[3]

The HD 2638 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >0.48 MJ 0.044 3.4442 ± 0.0002 0

See also

References

  1. 1 2 3 4 5 van Leeuwen, F. (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. Vizier catalog entry
  2. 1 2 3 4 5 6 Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290.
  3. 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: 00h 29m 59.87s, −05° 45′ 50.41″


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