Planet KOI-1257 b

Detailed information about planet KOI-1257 b and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name
KOI-1257 b
Planet Status
Confirmed
Discovered in
2014
Publication
Status
Published in a refereed paper
Update
2021-02-05
Mass
1.45 ( +0.35 -0.35 ) MJ
Mass*sin(i)
—
Semi-Major Axis
0.382 ( ± 0.006 ) AU
Orbital Period
86.647661 ( ± 3.4e-05 ) day
Eccentricity
0.772 ( ± 0.045 )
Angular distance
—
ω
141.3 ( ± 17.0 ) deg
Tperi
—
Radius
0.94 ( +0.12 -0.12 ) RJ
Inclination
89.66 ( +0.38 -0.24 ) deg
Detection Method
Primary Transit
Mass Meas. Method
—
Radius Meas. Method
—
Primary transit
2455006.79454 ( ± 0.0004 ) JD
Secondary transit
—
λ
74.0 ( +46.0 -32.0 ) deg
Impact Parameter b
—
Time Vr=0
—
Velocity Semiamplitude K
—
Calculated temperature
511.0 K
Measured temperature
—
Hottest point longitude
—
Geometric albedo
—
Surface gravity log(g/gH)
—
Alternate Names
KOI-1257 b, 2MASS J19245404+4455385 b, K01257.01, KIC 8751933 b, KOI-1257 A b, KOI-1257.01, Kepler-420 b, WISE J192454.01+445538.5 b
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
KOI-1257
Distance
900.0 ( ± 110.0 ) pc
Spectral type
G5 V
Apparent magnitude V
—
Apparent magnitude I
—
Apparent magnitude J
—
Apparent magnitude H
—
Apparent magnitude K
—
Mass
0.99 ( ± 0.05 ) MSun
Age
9.3 ( ± 3.0 ) Gyr
Effective temperature
5520.0 ( ± 80.0 ) K
Radius
1.13 ( ± 0.14 ) RSun
Metallicity [Fe/H]
0.27 ( ± 0.09 )
Detected Disc
—
Magnetic Field
—
RA2000
19:24:54.0
Dec2000
+44:55:38.6
Alternate Names
KOI-1257, 2MASS J19245404+4455385, KIC 8751933, KOI-1257 A, Kepler-420, WISE J192454.01+445538.5

The star KOI-1257 A is a member of a binary system with orbital peiod 3430 ± 1200 d, a semi-major axis 5.3 ± 1.3 AU, an eccentricity 0.31 and an inclination 18 185 deg. (Santerne et al. 2014)

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