HAT-P-6b
Extrasolar planet in the Andromeda constellation
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HAT-P-6b is a transiting extrasolar planet discovered by Noyes et al. on October 15, 2007.[2] It is located approximately 910 light-years away[4] in the constellation of Andromeda, orbiting the star HAT-P-6. This hot Jupiter planet orbits with a semi-major axis of about 0.05 AU, and takes 92 hours, 28 minutes, 17 seconds to orbit the star.[2] It has true mass of 5.7% greater than Jupiter and a radius 33% greater than Jupiter, corresponding to a density of 0.583 g/cm3, which is less than water.[1]
Size comparison of HAT-P-6b with Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | Noyes et al. |
| Discovery date | October 15, 2007 |
| transit | |
| Orbital characteristics | |
| 0.05239+0.00080 −0.00082 AU[1] | |
| Eccentricity | <0.044[1] |
| 3.852985±0.000005[2] d | |
| Inclination | 166±10 °[3] |
| Star | HAT-P-6 |
| Physical characteristics | |
| 1.33 ± 0.06 RJ[2] | |
| Mass | 1.106+0.039 −0.040[1] MJ |
Mean density | 0.583 g/cm3[1] |
The planet HAT-P-6b is named Nachtwacht. The name was selected in the NameExoWorlds campaign by the Netherlands, during the 100th anniversary of the IAU, after Rembrandt's painting The Night Watch.[5][6]
The sky projected angle between stellar and orbital axis is roughly 166°, making it one of the few planets that is in a retrograde orbit around its parent star.[3] Observations made by Spitzer Space Telescope shows that the planet atmosphere has a weak temperature inversion, or no inversion at all, depending on how strong is the stellar chromospheric activity.[7]
