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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.

Planets

HD 108874 b

HD 108874 b is a gas giant discovered in 2003 that orbits in the star's habitable zone.

Of all 293 planets found so far (June/07) it has the most Earth-like insolation.

Using the following formulas, derived from Luminosity(watts) = 4pi·RaT = 4pi·df

the Average, Apastron, and Periastron heat received by this planet can be calculated:

R, Star Radius (km)

a, Stefan-Boltzmann constant (5.67051e-8)

T, Star Effective temperature °K

f, Irradiance, Solar Constant (W/m)

d, Semi-major axis (meters)

Periastron Flux:${\displaystyle f_{p}={\frac {((1.22\times 6.955\times 10^{8})^{2})\times (5.67051\times 10^{-8})\times (5407^{4}K)}{((1.051-(1.051\times 0.07))\times 149597876600m)^{2}}}}$

Average Flux: ${\displaystyle f_{p}={\frac {((1.22\times 6.955\times 10^{8})^{2})\times (5.67051\times 10^{-8})\times (5407^{4}K)}{1.051\times 149597876600m)^{2}}}}$

Apastron Flux: ${\displaystyle f_{p}={\frac {((1.22\times 6.955\times 10^{8})^{2})\times (5.67051\times 10^{-8})\times (5407^{4}K)}{((1.051+(1.051\times 0.07))\times 149597876600m)^{2}}}}$

Being that HD 108874 b is a gas giant 1.36 (+/-0.13) times the mass of Jupiter, and that it has the most Earth-like Insolation to date (12/2007), it has the best probablity of having habitable moons.

HD 108874 c

HD 108874 c is a gas giant discovered in 2005 which orbits beyond the star's habitable zone.

References

• Butler; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal. 582 (1): 455–466. doi:10.1086/344570. {{cite journal}}: Explicit use of et al. in: |author= (help)
• Vogt; et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal. 632 (1): 638–658. doi:10.1086/432901. {{cite journal}}: Explicit use of et al. in: |author= (help)

The Extrasolar Planets Encyclopedia:

http://exoplanet.eu/star.php?st=HD+108874

http://exoplanet.eu/planet.php?p1=HD+108874&p2=b

http://exoplanet.eu/planet.php?p1=HD+108874&p2=c

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