Astronomy:Kepler-87

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Short description: Star in Cygnus
Kepler-87
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 51m 40.04s
Declination +46° 57′ 54.41″
Apparent magnitude (V) 15


Characteristics
Spectral type G4IV
Variable type planetary transit
Astrometry
Proper motion (μ) RA: -4.43279 ±0.0341821 mas/yr
Dec.: -0.932606 ±0.0402233 mas/yr
Parallax (π)0.782544 ± 0.0176347 mas
Details
Mass1.01 M
Radius1.49669 R
Luminosity0.3260445 L
Temperature5692 ± 60.7121 K
Metallicity [Fe/H]0.0562149±0.0587866 dex
Age7.24+1.50
−1.56
 years
Other designations
KOI-1574, 2MASS J19514005+4657544, KIC 10028792, WISE J195140.04+465754.4

Kepler-87 is a star slightly more massive than the Sun and it is nearing the end of its main-sequence period.[1]

Planetary system

Kepler-87 hosts four planets, two confirmed (Kepler-87b,[2] Kepler-87c[3] and two unconfirmed (Kepler-87d, Kepler-87e). It is the farthest system from the Sun with two unconfirmed planet candidates at 4021 light-years.[citation needed]

Template:Orbitbox planet hypotheticalTemplate:Orbitbox planet hypothetical
The Kepler-87 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 1.02+0.16
−0.16
 MJ
0.481+0.026
−0.028
114.73635+0.00015
−0.00015
0.036±0.009
c 0.02+0.003
−0.003
 MJ
0.676+0.037
−0.04
191.2318+0.0015
−0.0015
0.039±0.012

References