HD 221287 b

HD 221287 b
Exoplanet List of exoplanets
Parent star
Star HD 221287
Constellation Tucana
Right ascension (α) 23h 31m 20.3389s
Declination (δ) –58° 12 35.038
Distance172.502 ly
(52.889 pc)
Spectral type F7V
Orbital elements
Semi-major axis(a) 1.25 ± 0.04 AU
Periastron (q) 1.15 AU
Apastron (Q) 1.35 AU
Eccentricity (e) 0.08 ± 0.11
Orbital period(P) 456.1 ± 6.5 d
(1.2487 y)
Argument of
periastron
(ω) 98 ± 72°
Time of periastron (T0) 2,453,263 ± 100 JD
Semi-amplitude (K) 71 ± 13 m/s
Physical characteristics
Mass(m)>3.12 ± 0.78 MJ
(992 M)
Discovery information
Discovery date March 5, 2007
Discoverer(s) Naef et al.[1]
Discovery method HARPS
Discovery site  Chile
Discovery status Published[1]

HD 221287 b is an exoplanet approximately 173 light years away in the constellation of Tucana. This planet has mass >3.12 MJ (>992 M) and orbits in a habitable zone at 1.25 AUs (6.06 μpc) from the star, taking 1.25 years to orbit at 29.9 km/s around the star. Naef discovered this planet in early 2007 by using HARPS spectrograph located in Chile.[1]

Based on a probable 10−4 fraction of the planet mass as a satellite,[2] the planet can have a Mars-sized moon with habitable surface.[3] On the other hand, this mass can be distributed into many small satellites as well.

See also

References

  1. 1 2 3 Naef, M.; et al. (2007). "The HARPS search for southern extra-solar planets IX. Exoplanets orbiting HD 100777 , HD 190647 , and HD 221287". Astronomy and Astrophysics. 470 (2): 721–726. arXiv:0704.0917. Bibcode:2007A&A...470..721N. doi:10.1051/0004-6361:20077361.
  2. Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834-839.
  3. The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds
  • "Notes for planet HD 221287 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21.

Coordinates: 23h 31m 20.3389s, −58° 12′ 35.038″

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