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Kepler-87
Observation data
Epoch J2000.0      Equinox J2000.0
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]

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 — —
d (unconfirmed) — 0.0628 5.83393857±2.241 0 — —
e (unconfirmed) — 0.0836 8.9772888±0.0001451 0 — —

References

  1. ^ "Kepler-87 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
  2. ^ "The Extrasolar Planet Encyclopaedia — Kepler-87b". Extrasolar Planets Encyclopaedia. 1995. Retrieved 10 September 2023.
  3. ^ "The Extrasolar Planet Encyclopaedia — Kepler-87c". Extrasolar Planets Encyclopaedia. 1995. Retrieved 10 September 2023.


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