XO-4b is an
extrasolar planet approximately 956
light year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...
s away in the
constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
The origins of the e ...
of
Lynx
A lynx is a type of wild cat.
Lynx may also refer to:
Astronomy
* Lynx (constellation)
* Lynx (Chinese astronomy)
* Lynx X-ray Observatory, a NASA-funded mission concept for a next-generation X-ray space observatory
Places Canada
* Lynx, Ontar ...
. This planet was found by the
transit method by McCullough in May 2008. The planet has mass and radius . This planet orbits very close to the
F-type parent star, as it is typical for transiting planets, classing this planet as
Hot Jupiter.
Orbit
It takes only 4.125 days (or 99 hours) to orbit at a distance of 8.3
gigameter
The following are examples of orders of magnitude for different lengths.
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Overview
Detailed list
To help compare different orders of magnitude, the following list describes various lengths between 1.6 \times 10^ metres and 10 ...
s (0.0555
AU) away from the star.
The study in 2012, utilizing a
Rossiter–McLaughlin effect, have determined the planetary orbit is strongly misaligned with the equatorial plane of the star, misalignment equal to -46.7°.
Naming
The planet XO-4b is named Hämarik. The name was selected in the
NameExoWorlds campaign by
Estonia, during the 100th anniversary of the
IAU. Hämarik is Estonian for dusk, and was named for a character in a folk tale written by
Friedrich Robert Faehlmann.
See also
*
XO Telescope
References
External links
*
Hot Jupiters
Lynx (constellation)
Transiting exoplanets
Giant planets
Exoplanets discovered in 2008
Exoplanets with proper names
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