109 Piscium

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**109 Piscium**
Observation data Epoch J2000.0
Constellation	Pisces
Right ascension	01^h 44^m 55.8246^s
Declination	+20° 04′ 59.338″
Apparent magnitude (V)	6.292
Spectral Characteristics
Spectral type	G5IV
U-B color index	0.23
B-V color index	0.720
Variable type	none
Astrometry
Proper motion (μ)	RA: -45.05 mas/yr Dec.: -105.39 mas/yr
Parallax (π)	30.71 ± 0.81 mas
Distance	106 ly (30.6 pc)
Absolute magnitude (M_V)	3.72
Physical Characteristics
Mass	1.10 M_☉
Radius	? R_☉
Luminosity	? L_☉
Temperature	? K
Metallicity	[Fe/H]=+0.15
Rotation	?
Age	? years
Other designations
HD 10697, HIP 8159, Gl 72, HR 508, BD+19°282

109 Piscium is a yellow subgiant star located about 106 light years away in the constellation Pisces. It has a similar mass to our Sun, and has a higher abundance of iron.

In 2000 an extrasolar planet was detected around this star.

1 109 Piscium b
2 See also
3 References
4 External links

[edit] 109 Piscium b

**109 Piscium b^[1]**
Orbital elements
Extrasolar planet		Lists of extrasolar planets
Semimajor axis	(a)	2.16±0.12 AU
Eccentricity	(e)	0.1023±0.0096
Orbital period	(P)	1076.4±2.4 d
Inclination	(i)	?°
Longitude of periastron	(ω)	108.9±8.2°
Time of periastron	(τ)	2,450,396±29 JD
Physical characteristics
Mass	(m)	>6.38±0.53 M_J
Radius	(r)	? R_J
Density	(ρ)	? kg/m³
Temperature	(T)	? K
Discovery information
Discovery date		2000
Discoverer(s)		Vogt et al.
Detection method		Radial velocity
Discovery status		Confirmed

109 Piscium b is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is at least 6.12 times the mass of Jupiter and is likely to be a gas giant. As is typical for long-period planets discovered around other stars, it has an orbital eccentricity greater than that of Jupiter.

The discoverers estimate its effective temperature as 264 K from solar heating, but it could be at least 10-20 K warmer because of internal heating^[2].

Preliminary astrometric measurements suggest that the orbital inclination is 170.3°^[3], yielding an object mass of 38 times that of Jupiter. If these results are confirmed, this would mean that the object is a brown dwarf.