HAT-P-9b

Coordinates: Sky map 07h 20m 40.479s, +37° 08′ 26.17″
Source: Wikipedia, the free encyclopedia.
HAT-P-9b / Alef
SuperWASP)
Orbital characteristics
0.0528 ± 0.002 AU (7,900,000 ± 300,000 km)
Eccentricity~0.0012
3.92289 ± 0.00004 d
StarHAT-P-9
Physical characteristics
Mean radius
1.4 ± 0.06 RJ
Mass0.78 ± 0.09 MJ
Mean density
380 kg/m3 (640 lb/cu yd)
10.3 m/s2 (34 ft/s2)
1.05 g

HAT-P-9b, formally named Alef,

transit method on June 26, 2008. It has a mass 78% that of Jupiter and a radius 140% that of Jupiter. As with most transiting planets, this planet is a hot Jupiter, meaning this Jupiter-like planet orbits extremely close to its parent star, taking only 3.92 days to orbit.[2]

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 -16±8°.[3]

The name Alef was selected in the NameExoWorlds campaign by Israel, during the 100th anniversary of the IAU. Alef is the first letter in the Hebrew alphabet and also means bull.[1]

References

  1. ^ a b "Approved names". NameExoworlds. Retrieved 2020-01-02.
  2. S2CID 930937
    .
  3. S2CID 17174530

External links

Media related to HAT-P-9b at Wikimedia Commons



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