HD 221287

HD 221287
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Tucana
Right ascension 23h 31m 20.339s
Declination −58° 12′ 35.04″
Apparent magnitude (V) +7.82
Absolute magnitude (V)+4.20
Distance172.5 ly
(52.9 pc)
Spectral typeF7V
Other designations
CD-58°8579, HIP 116084, SAO 247912
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

HD 221287 is a yellow-white main-sequence star approximately 173 light years away in the constellation of Tucana. It has an apparent magnitude of 7.82 and absolute magnitude of 4.20. This star is also named HIP 116084.

Planetary system

On March 5, 2007, the astronomer Dominique Naef used the HARPS spectrograph to uncover HD 221287 b (among others).[1] Using the amplitude from observations with HARPS, he calculated a minimum mass of 3.12 times that of Jupiter, making this a superjovian. This planet orbits 25% further from the star than Earth to the Sun with a low eccentricity.

Stability analysis reveals that the orbits of Earth sized planets in HD 221287 b's Trojan points, located 60 degrees ahead and behind the planet in its orbit, would be stable for long periods of time.[2]

The HD 221287 planetary system[1]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >3.09 ± 0.79 MJ 1.25 ± 0.04 456.1 ± 6.5 0.08 ± 0.11 — —

See also

References

  1. 1 2 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:0704.0917Freely accessible. Bibcode:2007A&A...470..721N. doi:10.1051/0004-6361:20077361.
  2. ↑ R. Schwarz; R. Dvorak; Á. Süli; B. Érdi (November 2007). "Survey of the stability region of hypothetical habitable Trojan planets" (PDF). Astronomy and Astrophysics. 474 (3): 1023–1029. Bibcode:2007A&A...474.1023S. doi:10.1051/0004-6361:20077994.

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


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