HAT-P-9 b
Sign in to saveAlso known as Alef
HAT-P-9b, formally named Alef, is an exoplanet approximately 1500 light years away in the constellation Auriga. This planet was found by the 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.
Astronomical data · SIMBAD
- Object type
- Pl
- Distance
- 1,508 light-years
- Coordinates
- RA 110.1686° · Dec 37.1407°
via SIMBAD · CDS Strasbourg
Key facts
- Planet.name
- HAT-P-9b / Alef
- Planet.image
- HAT-P-9b Art.png
- Planet.caption
- An artist's impression of HAT-P-9b.
- Planet.discoverer
- Shporer et al.
- Planet.discovery_site
- Cambridge, Massachusetts
- Planet.discovered
- June 26, 2008
- Planet.discovery_method
- Transit (SuperWASP)
- Planet.apsis
- astron
- Planet.eccentricity
- ~0.0012
- Planet.period
- 3.92289 ± 0.00004 d
- Planet.star
- HAT-P-9
- Planet.mean_radius
- 1.4 ± 0.06
- Planet.mass
- 0.78 ± 0.09
- Planet.surface_grav
- 1.05 g
via Wikipedia infobox
Exoplanet data
- Host star
- HAT-P-9
- Discovered
- 2008
- Discovered by
- HATNet
- Orbital period
- 3.92 days
- Radius
- 15.61 × Earth
- Mass
- 238.05 × Earth
- Equilibrium temp
- 1540 K
- Distance
- 455.20 pc
via NASA Exoplanet Archive
Wikidata facts
- Constellation
- Auriga
- Parent body
- HAT-P-9
- Radius
- 1.4
- Mass
- 0.67
- Orbital period
- 3.92281131
- Image
- Exoplanet Comparison HAT-P-9 b.png
Show 17 more facts
- Commons category
- HAT-P-9 b
- orbital eccentricity
- 0.08
- catalog code
- TIC 371234684b
- time of discovery or invention
- 2009-01-00
- right ascension
- 110.16856766787458
- declination
- 37.14065077992389
- epoch
- J2000.0
- name
- Alef
- semi-major axis of an orbit
- 0.053
- orbital inclination
- 86.4
- M sin i
- 0.748
- discovery method
- transit method
- angular distance
- 0.00011
- right ascension component of proper motion
- -9.630
- declination component of proper motion
- -13.043
- parallax
- 2.1687
- argument of periapsis
- 152
via Wikidata · CC0
~1 min read
Encyclopedic overview
2 sectionsContents
- References
- External links
HAT-P-9b, formally named Alef, is an exoplanet approximately 1500 light years away in the constellation Auriga. This planet was found by the 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.
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°.
Excerpted from Wikipedia’s “HAT-P-9 b” article, available under the CC BY-SA 4.0 licence.