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 M
J (>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 .
Based on a probable 10 fraction of the planet mass as a satellite, the planet can have a Mars -sized moon with habitable surface. 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."
Insolation data for HD 221287 b
From Luminosity and distance irridance can be calculated:
Planet Distance
Insolation (W/m)% of Earth's
Earth's Aphelion Flux
1321.544
96.74%
HD 221287 b Apastron flux1,351.050
98.90%
Earth's Average Flux
1366.079
100.00%
Earth's Perihelion Flux
1412.903
103.43%
HD 221287 b Average flux 1,575.865
115.36%
HD 221287 b Periastron flux1,861.844
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
L
=
4
π
R
2
σ
T
e
f
f
4
{\displaystyle {\begin{smallmatrix}L=4\pi R^{2}\sigma T_{\rm {eff}}^{4}\end{smallmatrix}}}
L
{\displaystyle {\begin{smallmatrix}L\end{smallmatrix}}}
R
{\displaystyle {\begin{smallmatrix}R\end{smallmatrix}}}
T
e
f
f
{\displaystyle {\begin{smallmatrix}T_{\rm {eff}}\end{smallmatrix}}}
σ
{\displaystyle {\begin{smallmatrix}\sigma \end{smallmatrix}}}
Stefan–Boltzmann constant .
^ Earth's Solar Constant.
^
f
p
=
(
1.80245
×
3.0572
×
10
25
)
(
(
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
External links
