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
Mass0.89 ± 0.02[2] M☉
Radius0.8 ± 0.01[2] R☉
Luminosity0.407 ± 0.004[2] L☉
Surface gravity (log g)4.58 ± 0.02[2] cgs
Temperature5160 ± 24[2] K
Metallicity [Fe/H]0.12 ± 0.05[3] dex
Age1.9 ± 2.6[2] Gyr
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. HD 2638 is in a system with multiple stars, including at least HD 2567 and HD 2638 C. HD 2638 is 175.2 light-years (53.7parsec) from the Sun.[4]

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. The planet has a mass 0.48 of Jupiter and 152.6 the mass of Earth.[5]

The HD 2638 planetary system[5]
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 0.0407 — —

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 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  3. ↑ Tsantaki1, M.; Sousa, S. G.; Adibekyan, V. Zh.; Santos, N. C.; Mortier, A.; Israelian, G. (July 2013). "Deriving precise parameters for cool solar-type stars Optimizing the iron line list". Astronomy & Astrophysics. 555: 11. arXiv:1304.6639. Bibcode:2013A&A...555A.150T. doi:10.1051/0004-6361/201321103. A150.
  4. ↑ Open Exoplanet Catalogue, HD 2638
  5. 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. arXiv:1411.7048. Bibcode:2005A&A...439..367M. doi:10.1051/0004-6361:20052826.

Coordinates: 00h 29m 59.87s, −05° 45′ 50.41″


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