K2-187

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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
Distance313.7 pc
Details
Mass0.966999 +0.025227
−0.024169
[1] M
Radius0.894913 +0.041087
−0.025505
[1] R
Temperature5477 ± 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
SIMBADdata

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[edit]

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] [3]
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[edit]

  1. ^ a b c d "K2-187 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-03-05.
  2. ^ a b c d e http://outer.space.dtu.dk/awm/images/validationpaper.pdf
  3. ^ https://arxiv.org/abs/1810.04074