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HD 4208
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HD 4208 Observation data
Epoch J2000.0
Constellation Sculptor
Right ascension 0h 44m 26.65s
Declination -26° 30' 56.45"
Apparent magnitude (V) 7.79
Distance 106.6 ly
(32.70 pc)
Spectral type G5V
Other designations
CD-27°223, HIP 3479
HD 4208 is an 8th magnitude star in the constellation of Sculptor. Spectral type of the star G5 V. It is a yellow dwarf similar to our Sun, only slightly cooler and dimmer. It is not visible to the unaided eye, but with binoculars or small telescope it should be easy target.
In 2001 a planet was discovered orbiting the star.
[edit] HD 4208 b
HD 4208 b Extrasolar planet List of extrasolar planets
Orbital elements
Semimajor axis (a) 1.650±0.096 AU
Eccentricity (e) 0.052±0.040
Orbital period (P) 828.0±8.1 d
Angular distance (θ) 49 mas
Longitude of
periastron (ω) 345°
Time of periastron (T0) 2,451,040
±120 JD
Semi-Amplitude (K) 19.06±0.73 m/s
Physical characteristics
Mass (m) >0.804±0.073 MJ
Discovery information
Discovery date 2001
Discoverer(s) Vogt, Butler,
Marcy et al.
Detection method Radial velocity
Discovery status Published
The extrasolar planet, designated as HD 4208 b, was discovered by the California and Carnegie Planet Search team using the Keck telescope. The planet is probably somewhat less massive than Jupiter, although only its minimum mass is known. It orbits the star at a distance of 1.67 AU, slightly further than Mars orbits the Sun. Eccentricity is very low, meaning that the orbit is remarkably circular. Unfortunately, if the planet has any large moons, they are probably too cold to support life unless they have subsurface oceans like Jupiter's moon Europa is suspected to have.
[edit] References
* Vogt et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal 568: 552-562.
* Butler, R. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522. (web Preprint)
[edit] External links
* SIMBAD star entry, planet entry
* The Extrasolar Planets Encyclopaedia entry
* HD 4208 at Extrasolar Visions
* HD 4208 b at Extrasolar Visions
Sirius This main sequence star-related article is a stub. You can help Wikipedia by expanding it.
Retrieved from "http://en.wikipedia.org/wiki/HD_4208"
Categories: Extrasolar planets | HD and HDE objects | HIP objects | Sculptor constellation | Yellow dwarfs | Main sequence star stubs
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