A

David

Darling

HD 168443

HD 168443

HD 168443 is a Sun-like star in the constellation Serpens around which has been found a high-mass exoplanet (HD 168443 b) in a small orbit of very high eccentricity1 and a brown dwarf (HD 168443 c) in a larger orbit at the edge of the star's habitable zone.2

 

Host star
Distance 123.5 light-years (37.88 pc)
Spectral type G5IV
Apparent magnitude 6.92
Temperature 5,160 °C (5,430 K)
Luminosity (Sun=1) 2.1
Mass (Sun=1) 0.95
Position RA 18h 20m 04.11s; Dec. -09° 35' 34.6"


Planet: HD 168443 b
Mass (Jupiter=1) 7.2 ± 0.4
Semimajor axis 0.29 AU (43.5 million km, 27.0 million miles)
Orbital period 58.1 days
Eccentricity 0.53 ± 0.02
Discovery 1998, Marcy et al.
Method radial velocity

 

Brown dwarf: HD 168443 c
Mass (Jupiter=1) 34 ± 12
Semimajor axis 2.87 AU (430 million km, 267 million miles)
Orbital period 1740 ± 4 days
Eccentricity 0.228 ± 0.005
Discovery 2005, Marcy et al.
Method radial velocity

 


References

1. Marcy, G. W., Butler, R. P, Vogt, S. S., Fischer, D., and Liu, M. C. "Two New Planets in Eccentric Orbits," Astrophysical Journal, 520, 239 (1999).
2. Marcy, G., Butler, R., Vogt, S., Liu, M., Laughlin, G., Apps, K., Graham, J., Lloyd, J., Luhman, K., Jayawardhana, R. "Two Substellar Companions Orbiting HD 168443," Astrophysical Journal, 555, 418–425 (2005).