HD 221287 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 221287</td></tr><tr> <td colspan="2">Constellation</td> <td>Tucana</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>23h 31m 20.3389s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–58° 12′ 35.038″</td></tr><tr><td colspan="2">Distance</td><td>172.502 ly
(52.889 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F7V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.25 ± 0.04 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>1.15 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.35 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.08 ± 0.11</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>456.1 ± 6.5 d
(1.2487 y)</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>98 ± 72°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,453,263 ± 100 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>71 ± 13 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>3.12 ± 0.78 MJ
(992 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>March 5, 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Naef et al.[1]</td></tr><tr> <td colspan="2">Discovery method</td> <td>HARPS</td></tr><tr> <td colspan="2">Discovery site</td> <td>23x15px Chile</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</td></tr>

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 Edit

References Edit

  1. 1.0 1.1 1.2 (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.
  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

External links Edit

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

es:HD 221287#Sistema planetario

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