Movatterモバイル変換

[0]ホーム
URL:

Jump to content
WikipediaThe Free Encyclopedia
Search

HD 221287 b

Coordinates:Sky map23h 31m 20.3389s, −58° 12′ 35.038″
From Wikipedia, the free encyclopedia
Exoplanet in the constellation Tucana
HD 221287 b / Pipitea
Discovery
Discovered byDominique Naef [fr]et al.[1]
Discovery site Chile
Discovery dateMarch 5, 2007
HARPS
Orbital characteristics
Apastron1.35 AU (202,000,000 km)
Periastron1.15 AU (172,000,000 km)
1.25 ± 0.04 AU (187,000,000 ± 6,000,000 km)
Eccentricity0.08 ± 0.11
456.1 ± 6.5d
1.2487y
2,453,263 ± 100
98 ± 72
Semi-amplitude71 ± 13
StarHD 221287
Physical characteristics
Mass>3.12 ± 0.78MJ
(992ME)

HD 221287 b, also known asPipitea, is anexoplanet that orbitsHD 221287, approximately 173light years away in theconstellation ofTucana. This planet hasmass >3.12 MJ (>992 M🜨) and orbits in ahabitable zone at 1.25AUs (6.06μpc) from the star, taking 1.25 years to orbit at 29.9km/s around the star.Dominique Naef [fr] discovered this planet in early 2007 by usingHARPSspectrograph located inChile.[1]

Based on a probable 10−4 fraction of the planet mass as a satellite,[2] the planet can have aMars-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 theCook Islands in theIAU's 2019NameExoWorlds 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

[edit]
Further information:Luminosity andClimate model § Zero-dimensional models

From Luminosity and distance irridance can be calculated:[note 1]

Planet DistanceInsolation (W/m2)% of Earth's
Earth's Aphelion Flux1321.54496.74%
HD 221287 bApastron flux1,351.05098.90%
Earth's Average Flux[note 2]1366.079100.00%
Earth's Perihelion Flux1412.903103.43%
HD 221287 bAverage flux[note 3]1,575.865115.36%
HD 221287 bPeriastron flux1,861.844136.29%
Venus' Aphelion Flux2585.411188.72%
Venus' Average Flux2620.693191.30%
Venus' Perihelion Flux2656.70193.93%

See also

[edit]

Notes

[edit]
  1. ^FromL=4πR2σTeff4{\displaystyle {\begin{smallmatrix}L=4\pi R^{2}\sigma T_{\rm {eff}}^{4}\end{smallmatrix}}}, whereL{\displaystyle {\begin{smallmatrix}L\end{smallmatrix}}} is the luminosity,R{\displaystyle {\begin{smallmatrix}R\end{smallmatrix}}} is the radius,Teff{\displaystyle {\begin{smallmatrix}T_{\rm {eff}}\end{smallmatrix}}} is the effective surface temperature andσ{\displaystyle {\begin{smallmatrix}\sigma \end{smallmatrix}}} is theStefan–Boltzmann constant.
  2. ^Earth'sSolar Constant.
  3. ^fp=(1.80245×3.0572×1025)((1.25−(1.25×0.08))×149597870700)2{\displaystyle f_{p}={\frac {(1.80245\times 3.0572\times 10^{25})}{((1.25-(1.25\times 0.08))\times 149597870700)^{2}}}}

References

[edit]
  1. ^abNaef, 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.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". Archived fromthe original on 2017-12-01. Retrieved2013-06-23.
  4. ^"Approved names (§ Cook Islands)".Name Exo Worlds.IAU. Retrieved19 December 2019.

External links

[edit]


Stars
Bayer
Variable
HR
HD
Other
Exoplanets
Star
clusters
NGC
Other
Nebulae
Galaxies
NGC
Other


Stub icon

This extrasolar-planet-related article is astub. You can help Wikipedia byexpanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_221287_b&oldid=1276066363"
Categories:
Hidden categories:
[8]ページ先頭
©2009-2025 Movatter.jp