Kepler-87

Kepler-87

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cygnus[1]
Right ascension	19^h 51^m 40.0490^s[2]
Declination	+46° 57′ 54.425″[2]
Apparent magnitude (V)	15
Characteristics
Spectral type	G4IV
Variable type	planetary transit
Astrometry
Proper motion (μ)	RA: −4.382(19) mas/yr[2] Dec.: −0.821(20) mas/yr[2]
Parallax (π)	0.7803±0.0154 mas[2]
Distance	4,180 ± 80 ly (1,280 ± 30 pc)
Other designations
KOI-1574, 2MASS J19514005+4657544, KIC 10028792, WISE J195140.04+465754.4
Database references
SIMBAD	data
Exoplanet Archive	data

Kepler-87 is a star slightly more massive than the Sun and it is nearing the end of its main-sequence period.^[3]

Planetary system

Kepler-87 hosts four planets, two confirmed (Kepler-87b,^[4] Kepler-87c^[5] 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. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
3. "Kepler-87 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 10 September 2023.
4. "The Extrasolar Planet Encyclopaedia — Kepler-87b". Extrasolar Planets Encyclopaedia. 1995. Retrieved 10 September 2023.
5. "The Extrasolar Planet Encyclopaedia — Kepler-87c". Extrasolar Planets Encyclopaedia. 1995. Retrieved 10 September 2023.