HD 10697

HD 10697 (109 Piscium)

HD 10697 is a Sunlike star in the constellation Pisces around which has been found an object that is either a large exoplanet or a brown dwarf. The discovery of the companion object was announced in 2000.


HD 10697, also known as 109 Piscium, is a yellow subgiant star with a higher metallicity than that of the Sun. Its companion, HD 10697 b has mass at least 6 times that of Jupiter and perhaps as great as 38 times the mass of Jupiter. The latter estimate is based on preliminary astrometric measurements suggesting an orbital inclination of 170° (i.e., almost face-on as seen from Earth).


Host star
Distance 106 light-years (30.6 pc)
Spectral type G5 IV
Apparent magnitude 6.29
Position R.A. 01h 44m 55.82s;
Dec. +20° 04' 59.34?
Other catalog designations 109 Pisces, HIP 8159, Gl 72, HR 508, BD+19°282

Mass (Jupiter=1) > 6.12
Semimajor axis 2.13 AU (320 million km, 198 million miles)
Orbital period 1,077.9 days
Eccentricity 0.11
Discovery 2000, SFSU Planet Search
Method of discovery radial velocity



1. S. Vogt, G. W. Marcy, R. P. Butler, K. Apps (2000). "Six New Planets from the Keck Precision Velocity Survey". Astrophysical Journal, 536: 902–914.
2. I. Han, D. C. Black, G. Gatewood (2001). "Preliminary Astrometric Masses for Proposed Extrasolar Planetary Companions". Astrophysical Journal, 548: L57–L60.