Back HAT-P-8b Arabic HAT-P-8b Spanish HAT-P-8b ID HAT-P-8b Japanese HAT-P-8b Korean HAT-P-8b Portuguese HAT-P-8 b Russian HAT-P-8b Vietnamese HAT-P-8b Chinese
 Size comparison of HAT-P-8b with Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | HATNet Project |
| Discovery date | December 5, 2008 |
| Transit | |
| Orbital characteristics | |
| 0.04496+0.00046 −0.00045 AU | |
| Eccentricity | <0.0060[1] |
| 3.0763458±0.0000024[2] d | |
| Inclination | 87.5+1.9 −0.9 |
| Star | GSC 02757-01152 |
| Physical characteristics | |
| 1.334±0.013 RJ[3] | |
| Mass | 1.354±0.035[1] MJ |
HAT-P-8b is an extrasolar planet located approximately 720 light years away in the constellation of Pegasus, orbiting the 10th magnitude star GSC 02757-01152. This planet was discovered by transit on December 5, 2008. Despite the designation as HAT-P-8b, it is the 11th planet discovered by the HATNet Project. The mass of the planet is 50% more than Jupiter while the radius is also 50% more than Jupiter. The mass of this planet is exact since the inclination of the orbit is known, typical for transiting planets. This is a so-called “hot Jupiter” because this Jupiter-like gas giant planet orbits in a really close torch orbit around the star, making this planet extremely hot (in the order of a thousand kelvins). The distance from the star is roughly 20 times smaller than that of Earth from the Sun, which places the planet roughly 8 times closer to its star than Mercury is from the Sun. The “year” on this planet lasts only 3 days, 1 hour, 49 minutes, and 54 seconds, compared with Earth's 365 days, 6 hours, 9 minutes, and 10 seconds in a sidereal year.[4]
The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is mildly misaligned with the rotational axis of the star, misalignment equal to -17+9.2
−11.5°.[5]
- ^ a b Cite error: The named reference
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Mancini2013was invoked but never defined (see the help page). - ^ Cite error: The named reference
Wang2021was invoked but never defined (see the help page). - ^ Cite error: The named reference
Latham2009was invoked but never defined (see the help page). - ^ Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments", The Astrophysical Journal, 757 (1): 18, arXiv:1206.6105, Bibcode:2012ApJ...757...18A, doi:10.1088/0004-637X/757/1/18, S2CID 17174530
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