K2-288

K2-288
Observation data; Epoch J2000 Equinox J2000
Constellation	Taurus
Right ascension	03h 41m 46.43s
Declination	+18° 16′ 08.0″
Characteristics
Spectral type	M2 V + M3 V
Orbit
Primary	K2-288 A
Companion	K2-288 B
Semi-major axis (a)	55 AU
Details
K2-288 A
Mass	0.52±0.02 M☉
Radius	0.45±0.03 R☉
Surface gravity (log g)	4.85±0.03 cgs
Temperature	3584±205 K
Metallicity [Fe/H]	−0.29±0.09 dex
K2-288 B
Mass	0.33±0.02 M☉
Radius	0.32±0.03 R☉
Surface gravity (log g)	4.96±0.02 cgs
Temperature	3341±276 K
Metallicity [Fe/H]	−0.21±0.09 dex
Database references
SIMBAD	data

K2-288 is a binary star system consisting of two red dwarfs. The companion star, K2-288B, is known to host a single planet, K2-288Bb.

Planetary System

In January 2019, it was announced that a team of citizen scientists had discovered a planet orbiting K2-288B.^[2]

The K2-288 planetary system^[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	—	0.164 ± 0.03	31.393463+0.000067 −0.000069	—	89.81+0.13 −0.17°	1.90 ± 0.3 $R$ _🜨

Observation data Epoch J2000 Equinox J2000
Constellation	Taurus^[1]
Right ascension	03^h 41^m 46.43^s^[2]
Declination	+18° 16′ 08.0″^[2]
Characteristics
Spectral type	M2 V^[2] + M3 V^[2]
Orbit^[2]
Primary	K2-288 A
Companion	K2-288 B
Semi-major axis (a)	55 AU
Details^[2]
K2-288 A
Mass	0.52±0.02 `M`_☉
Radius	0.45±0.03 `R`_☉
Surface gravity (log g)	4.85±0.03 cgs
Temperature	3584±205 K
Metallicity [Fe/H]	−0.29±0.09 dex
K2-288 B
Mass	0.33±0.02 `M`_☉
Radius	0.32±0.03 `R`_☉
Surface gravity (log g)	4.96±0.02 cgs
Temperature	3341±276 K
Metallicity [Fe/H]	−0.21±0.09 dex
Database references
SIMBAD	data