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