HAT-P-4 b
Sign in to saveHAT-P-4b is a confirmed extrasolar planet orbiting the star HAT-P-4 over 1000 light years away in Boötes constellation. It was discovered by transit on October 2, 2007, which looks for slight dimming of stars caused by planets that passed in front of them. It is the fourth planet discovered by the HATNet Project. It is also called BD+36 2593b, TYC 2569-01599-1b, 2MASS J15195792+3613467b, SAO 64638b.
Astronomical data · SIMBAD
- Object type
- Pl
- Distance
- 1,050 light-years
- Coordinates
- RA 229.9913° · Dec 36.2296°
via SIMBAD · CDS Strasbourg
Key facts
- Planet.name
- HAT-P-4b
- Planet.image
- Exoplanet Comparison HAT-P-4 b.png
- Planet.caption
- Size comparison of HAT-P-4b with Jupiter.
- Planet.discoverer
- Kovacs et al.
- Planet.discovery_site
- Mass.,
- Planet.discovered
- Oct 2, 2007
- Planet.discovery_method
- transit
- Planet.apsis
- astron
- Planet.semimajor
- AU
- Planet.period
- d
- Planet.inclination
- 89.9
- Planet.star
- HAT-P-4
- Planet.mean_radius
- 1.28
via Wikipedia infobox
Exoplanet data
- Host star
- HAT-P-4
- Discovered
- 2007
- Discovered by
- HATNet
- Orbital period
- 3.06 days
- Radius
- 14.28 × Earth
- Mass
- 213.25 × Earth
- Equilibrium temp
- 1686 K
- Distance
- 320.45 pc
via NASA Exoplanet Archive
Wikidata facts
- Instance of
- star
- Constellation
- Boötes
- Parent body
- HAT-P-4
- Radius
- 1.27
- Mass
- 0.651
- Orbital period
- 3.0565114
- Image
- HAT-P-4-transit.jpg
Show 16 more facts
- orbital inclination
- 89.67
- catalog code
- TIC 138294130b
- Commons category
- HAT-P-4 b
- time of discovery or invention
- 2007-11-00
- right ascension
- 229.99133557140706
- declination
- 36.22964943825889
- epoch
- J2000.0
- discovery method
- transit method
- semi-major axis of an orbit
- 0.0446
- angular distance
- 0.000144
- orbital eccentricity
- 0.0073
- right ascension component of proper motion
- -21.661
- declination component of proper motion
- -24.250
- parallax
- 3.0919
- M sin i
- 0.655
- argument of periapsis
- 97.4
Sources (1)
via Wikidata · CC0
~1 min read
Encyclopedic overview
2 sectionsContents
- References
- External links
HAT-P-4b is a confirmed extrasolar planet orbiting the star HAT-P-4 over 1000 light years away in Boötes constellation. It was discovered by transit on October 2, 2007, which looks for slight dimming of stars caused by planets that passed in front of them. It is the fourth planet discovered by the HATNet Project. It is also called BD+36 2593b, TYC 2569-01599-1b, 2MASS J15195792+3613467b, SAO 64638b.
It is a hot Jupiter with 68% the mass and 127% the radius of Jupiter, and 41% the density of water (31% of Jupiter). Since the inclination is known by transit observation, the true mass is known. The secondary eclipse where the planet passes behind the star was detected by the Spitzer Space Telescope leading to the discovery that the planet has inefficient heat transfer from its day to night side.
Excerpted from Wikipedia’s “HAT-P-4 b” article, available under the CC BY-SA 4.0 licence.