Planet 51 Peg c

Detailed information about planet 51 Peg c and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name
51 Peg c
Planet Status
Confirmed
Discovered in
2011
Publication
Status
Published in a refereed paper
Update
2024-09-01
Mass
70.0 ( +70.0 -40.0 ) MJ
Mass*sin(i)
—
Semi-Major Axis
44.0 AU
Orbital Period
—
Eccentricity
—
Angular distance
—
ω
—
Tperi
—
Radius
—
Inclination
—
Detection Method
Imaging, Astrometry
Mass Meas. Method
Astrometry
Radius Meas. Method
—
Primary transit
—
Secondary transit
—
λ
—
Impact Parameter b
—
Time Vr=0
—
Velocity Semiamplitude K
—
Calculated temperature
—
Measured temperature
—
Hottest point longitude
—
Geometric albedo
—
Surface gravity log(g/gH)
—
Alternate Names
—
Data Source Type Result Value Result Figure Notes Reference
Molecule Data Source Type Result Value Result Figure Notes Reference

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Star

Name
51 Peg
Distance
15.4614 ( ± 0.0297 ) pc
Spectral type
G2IV-V
Apparent magnitude V
5.49
Apparent magnitude I
—
Apparent magnitude J
—
Apparent magnitude H
—
Apparent magnitude K
—
Mass
1.03 ( ± 0.126 ) MSun
Age
4.0 ( ± 2.5 ) Gyr
Effective temperature
5758.0 ( ± 110.623 ) K
Radius
1.176 ( ± 0.051 ) RSun
Metallicity [Fe/H]
0.18 ( ± 0.1 )
Detected Disc
—
Magnetic Field
—
RA2000
22:57:27.0
Dec2000
+20:46:07.0
Alternate Names
HD 217014

Roberts et al. (2011) reported a visual companion at a projected separation of 2.87 arcseconds, about 44-45 AUs. Kervella et al. (2019) estimate a mass of m ≈ 70-40+70 MJup, compatible with an early T-type brown dwarf. The visual companion may be gravitationally bound to 51 Peg, although further characterization is needed to confirm this.

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