HD 108874

Starbox begin
name=HD 108874 Starbox observe
epoch=2000
constell=Coma Berenices
ra=RA|12|30|26.8829
dec=DEC|+22|52|47.383
spectral=G5V
appmag_v=8.76 Starbox character
class=G5 V
b-v=0.764
u-b=
v-r=0.4
r-i=0.4
variable=”None”Starbox astrometry
radial_v=-30.7
prop_mo_ra=-45.05
prop_mo_dec=-105.39
parallax=14.59
p_error=1.24
absmag_v=3.72Starbox detail
mass=1
radius=1.22
luminosity=1.14
temperature=5407
metal= [Fe/H] =+0.14
rotation=37.82 days
age=7.26 Giga- Starbox catalog
names=BD+23°2466, HIP 61028, SAO 82344Starbox reference
Simbad=HD+108874
ARICNS=

HD 108874 is a yellow dwarf star (spectral type G5 V) in the constellation of Coma Berenices. It is 223 light years from Earth and has two extrasolar planets that are possibly in a 4:1 orbital resonance.

Star

HD 108874 is 2.7 billion years older than our Sun. The star has a temperature of 5407 K and luminosity 1.14 solar. It has metallicity 1.38 times solar, meaning this star has greater iron abundance relative to hydrogen and helium. It has mass about the same as the Sun, but the radius is 22% greater.

Planetary system

In 2002, the jovian planet HD 108874 b was discovered in the United States by Paul Butler, Geoffrey Marcy, Steven Vogt, and Debra Fischer. This planet receives the insolation most similar to Earth than any extrasolar planets. In 2005, further observations revealed this star has another jovian planet orbiting further out, designated as HD 108874 c. Those two planets are in a 4:1 orbital resonance. This means if HD 108874 b orbits the star four times, then HD 108874 c orbits only once, because the orbital period for planet c is four times longer than planet b.

PlanetboxOrbit
exoplanet = b
mass = >1.36 ± 0.13
period = 395.4 ± 2.5
semimajor = 1.051 ± 0.02
eccentricity = 0.07 ± 0.04PlanetboxOrbit
exoplanet = c
mass = >1.018 ± 0.3
period = 1605.8 ± 88
semimajor = 2.68 ± 0.25
eccentricity = 0.25 ± 0.07

See also

* List of stars with confirmed extrasolar planets

External links

*
*
* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona