HD 217107 is a Sun-like star in the constellation Pisces around which has been found an exoplanet slightly more massive than Jupiter in an extraordinarily small orbit of significant eccentricity.¹

 

Host star
distance	121 light-years (37 pc)
spectral type	G8 IV
apparent magnitude	6.16
temperature	5,090 °C (5,360 K)
luminosity (Sun=1)	1.32
mass (Sun=1)	1.02
position	RA 22h 58m 16s, Dec -02° 23' 42"

 

Planet
mass (Jupiter=1)	1.28
semi-major axis	0.074 AU (11.1 million km, 6.9 million mi)
orbital period	7.11 days
eccentricity	0.14
discovery	1998, Marcy et al, SFSU Planet Search, Lick and Keck Obs.
method	radial velocity

 

Reference

1. Fischer, D., Marcy, G., Butler, P., Vogt, S., and Apps, K. "Planetary Companions Around Two Solar Type Stars: HD 195019 and HD 217107," Publications of the Astronomical Society of the Pacific, 111, 50 (1999).