K2-187

K2-187[1]
Observation data; Epoch J2000 Equinox J2000
Constellation	Cancer
Right ascension	08h 50m 05.67s
Declination	+23° 11′ 33.36″
Apparent magnitude (V)	12.864 (Kepler magnitude)[2]
Characteristics
Spectral type	G
Astrometry
Proper motion (μ)	RA: -11.864 mas/yr ; Dec.: -30.702 mas/yr
Parallax (π)	2.9939 ± 0.0510[3] mas
Distance	1,090 ± 20 ly ; (334 ± 6 pc)
Details
Mass	0.966999 +0.025227; −0.024169[1] M☉
Radius	0.894913 +0.041087; −0.025505[1] R☉
Temperature	5477 ± 50[2] K
Metallicity [Fe/H]	+0.26 ± 0.08[2] dex
Other designations
	EPIC 212157262, K2-187, WISE J085005.65+231133.0, 2MASS J08500566+2311333
Database references
SIMBAD	data

K2-187, also known as EPIC 212157262, is a Sun-like star in K2 Campaign 5. It is very close in size and temperature to the Sun, and has a system of four confirmed exoplanets ranging between 1.4 R_⊕ and 3.2 R_⊕. The innermost planet takes just 18 hours to orbit its star, while the outermost planet orbits every 2 weeks.[2]

Planetary system

K2-187 has at least four orbiting exoplanets: two Super-Earths, one Hot Neptune, and one Mini-Neptune. All four planets are in near-resonances with each other and are far too hot for life.

The K2-187 planetary system[2][1] [4]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	—	0.016322	0.773981+0.000052 −0.000050	—	81.930168+5.825258 −11.735217°	1.30+0.13 −0.13 R_⊕
c	—	0.0391185	2.871788+0.000256 −0.000257	—	86.067367+2.836604 −6.998926°	1.80+0.14 −0.14 R_⊕
d	—	0.0718533	7.149079+0.000360 −0.000372	—	87.483206+1.886985 −3.903548°	3.17+0.18 −0.18 R_⊕
e	—	0.11036	13.608341+0.001661 −0.001580	—	88.970197+0.751147 −1.318388°	2.38+0.18 −0.18 R_⊕

References

"K2-187 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-03-05.
"Andrew W. Mayo" (PDF).
Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
Livingston, John H.; Crossfield, Ian J. M.; Petigura, Erik A.; Gonzales, Erica J.; Ciardi, David R.; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Henning, Thomas; Howard, Andrew W.; Isaacson, Howard; Fulton, Benjamin J.; Kosiarek, Molly; Schlieder, Joshua E.; Sinukoff, Evan; Tamura, Motohide (2018). "Sixty Validated Planets from K2 Campaigns 5–8". The Astronomical Journal. 156 (6): 277. arXiv:1810.04074. doi:10.3847/1538-3881/aae778. S2CID 119387939.

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[NasaExoplanetArchive-1] "K2-187 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-03-05.

[dtu.dk-2] "Andrew W. Mayo" (PDF).

[dr2-3] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[4] Livingston, John H.; Crossfield, Ian J. M.; Petigura, Erik A.; Gonzales, Erica J.; Ciardi, David R.; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Henning, Thomas; Howard, Andrew W.; Isaacson, Howard; Fulton, Benjamin J.; Kosiarek, Molly; Schlieder, Joshua E.; Sinukoff, Evan; Tamura, Motohide (2018). "Sixty Validated Planets from K2 Campaigns 5–8". The Astronomical Journal. 156 (6): 277. arXiv:1810.04074. doi:10.3847/1538-3881/aae778. S2CID 119387939.