K2-58

K2-58 (also designated as EPIC 206026904) is a G-type main-sequence star in the constellation of Aquarius, approximately 596 light-years from the Solar System. The star is metal-rich, having 155% of the Solar abundance of elements heavier than helium.^[6] The star is located in a region where a hypothetical observer in the K2-58 system can see Venus transiting the Sun.^[9]

K2-58

Observation data Epoch J2000      Equinox J2000
Constellation	Aquarius[1]
Right ascension	22h 15m 17.2365s[2]
Declination	−14° 02′ 59.313″[2]
Apparent magnitude (V)	12.13
Characteristics
Evolutionary stage	Main sequence
Spectral type	K0[3]
Astrometry
Radial velocity (Rv)	6.48±0.42[2] km/s
Proper motion (μ)	RA: 4.67±0.02 mas/yr[2] Dec.: -11.11±0.02 mas/yr[2]
Parallax (π)	5.4932±0.0194 mas[2]
Distance	594 ± 2 ly (182.0 ± 0.6 pc)
Details
Mass	0.858+0.022 −0.027[4] M☉
Radius	0.803+0.034 −0.020[4] R☉
Luminosity	0.57[5] L☉
Surface gravity (log g)	4.5[6] cgs
Temperature	5,038[6] K
Metallicity [Fe/H]	0.25[6] dex
Rotational velocity (v sin i)	2.2±0.5[6] km/s
Age	5.1+3.1 −2.6[7] Gyr
Other designations
EPIC 206026904, 2MASS J22151722-1402593, Gaia DR3 2599975224481836672[8]
Database references
SIMBAD	data

Planetary system

The planetary system has three confirmed exoplanets, named K2-58 b, K2-58 c, and K2-58 d,^[10][11][12] discovered in 2016.^[13]

The K2-58 planetary system^[13][4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
K2-58c	—	0.0350	2.53726	—	86.1+2.8 −7.3°	1.62 R🜨
K2-58b	—	0.0692	7.05254	—	88.9+0.8 −1.6°	2.68 R🜨
K2-58d	—	0.1517	22.8827	—	89.43+0.41 −0.81°	1.71 R🜨