Astronomy:HD 221287 b
| Discovery | |
|---|---|
| Discovered by | Dominique Naef et al.[1] |
| Discovery site |  Chile |
| Discovery date | March 5, 2007 |
| HARPS | |
| Orbital characteristics | |
| astron|astron|helion}} | 1.35 AU (202,000,000 km) |
| astron|astron|helion}} | 1.15 AU (172,000,000 km) |
| 1.25 ± 0.04 AU (187,000,000 ± 6,000,000 km) | |
| Eccentricity | 0.08 ± 0.11 |
| Orbital period | 456.1 ± 6.5 d 1.2487 y |
| astron|astron|helion}} | 2,453,263 ± 100 |
| 98 ± 72 | |
| Semi-amplitude | 71 ± 13 |
| Star | HD 221287 |
| Physical characteristics | |
| Mass | >3.12 ± 0.78 |♃|J}}}}}} (992 M⊕) |
HD 221287 b, also known as Pipitea, is an exoplanet that orbits HD 221287, 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. Dominique 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.
It was named "Pipitea" by representatives of the Cook Islands in the IAU's 2019 NameExoWorlds contest, with the comment "Pipitea is a small, white and gold pearl found in Penrhyn lagoon in the northern group of the Cook Islands."[4]
Insolation data for HD 221287 b
From Luminosity and distance irridance can be calculated: [note 1]
| Planet Distance | Insolation (W/m2) | % of Earth's |
|---|---|---|
| Earth's Aphelion Flux | 1321.544 | 96.74% |
| HD 221287 b Apastron flux | 1,351.050 | 98.90% |
| Earth's Average Flux [note 2] | 1366.079 | 100.00% |
| Earth's Perihelion Flux | 1412.903 | 103.43% |
| HD 221287 b Average flux [note 3] | 1,575.865 | 115.36% |
| HD 221287 b Periastron flux | 1,861.844 | 136.29% |
| Venus' Aphelion Flux | 2585.411 | 188.72% |
| Venus' Average Flux | 2620.693 | 191.30% |
| Venus' Perihelion Flux | 2656.70 | 193.93% |
See also
Notes
- ↑ From [math]\displaystyle{ \begin{smallmatrix}L=4 \pi R^2 \sigma T_{\rm eff}^4 \end{smallmatrix} }[/math], where [math]\displaystyle{ \begin{smallmatrix}L \end{smallmatrix} }[/math] is the luminosity, [math]\displaystyle{ \begin{smallmatrix}R \end{smallmatrix} }[/math] is the radius, [math]\displaystyle{ \begin{smallmatrix}T_{\rm eff}\end{smallmatrix} }[/math] is the effective surface temperature and [math]\displaystyle{ \begin{smallmatrix}\sigma \end{smallmatrix} }[/math] is the Stefan–Boltzmann constant.
- ↑ Earth's Solar Constant.
- ↑ [math]\displaystyle{ f_p= \frac{ (1.80245\times 3.0572\times 10^{25})} { ( ( 1.25 - ( 1.25 \times 0.08 ) ) \times 149597870700 )^2 } }[/math]
References
- ↑ 1.0 1.1 Naef, D. 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. doi:10.1051/0004-6361:20077361. Bibcode: 2007A&A...470..721N. http://www.aanda.org/articles/aa/full/2007/29/aa7361-07/aa7361-07.html.
- ↑ Canup R.M., Ward W.R. (2006). A common mass scaling for satellite systems of gaseous planets. Nature, 441: 834-839.
- ↑ "The Habitable Exoplanets Catalog: Data of Potential Habitable Worlds". http://phl.upr.edu/projects/habitable-exoplanets-catalog/data.
- ↑ "Approved names (§ Cook Islands)". IAU. http://www.nameexoworlds.iau.org/final-results. Retrieved 19 December 2019.
External links
- "Notes for planet HD 221287 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/hd_221287_b--372/. Retrieved 2008-07-21.
Coordinates: 
23h 31m 20.3389s, −58° 12′ 35.038″
es:HD 221287#Sistema planetario
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