Astronomy:Pipitea (planet)

From HandWiki
Pipitea
Discovery
Discovered byNaef et al.[1]
Discovery site Chile
Discovery dateMarch 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)
Eccentricity0.08 ± 0.11
Orbital period456.1 ± 6.5 d
1.2487 y
astron|astron|helion}}2,453,263 ± 100
98 ± 72
Semi-amplitude71 ± 13
StarHD 221287
Physical characteristics
Mass>3.12 ± 0.78 ||J}}}}}}
(992 M)


Pipitea,[2] originally named HD 221287 b, is an exoplanet that orbits Poerava, 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,[3] the planet can have a Mars-sized moon with habitable surface.[4] On the other hand, this mass can be distributed into many small satellites as well.

The star was originally given the temporary designation "HD 221287 b" as the second object in the HD 221287 system before being officially 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."[2]

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

  1. 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.
  2. Earth's Solar Constant.
  3. [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

External links

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


es:HD 221287#Sistema planetario