Table 1
Stellar properties of K2-138.
| Parameter | Value and uncertainty |
|---|---|
| Astrometry | |
| K2 campaign | 12(a) |
| EPIC | 245 950 175(a) |
| 2MASS ID | J23154776−1050590(b) |
| Gaia ID | DR2 2413596935442139520(c) |
| RA (J2000) | 23:15:47.77(c) |
| Dec (J2000) | −10:50:58.90(c) |
| μRA [mas yr−1] | − 1.02 ± 0.09(c) |
| μDEC [mas yr−1] | − 10.52 ± 0.09(c) |
| Parallax [mas] | 4.962 ± 0.065(d) |
| Distance [pc] | 201.66 ± 6.38(d) |
| Photometric magnitudes | |
| Kepler Kp | 12.069(a) |
| Gaia G | 12.0252 ± 0.0004(c) |
| Gaia BP | 12.4634 ± 0.0022(c) |
| Gaia RP | 11.4524 ± 0.0015(c) |
| Johnson B | 13.063 ± 0.051(e) |
| Johnson V | 12.217 ± 0.035(e) |
| Sloan g′ | 12.669 ± 0.262(e) |
| Sloan r′ | 11.962 ± 0.038(e) |
| Sloan i′ | 11.809 ± 0.209(e) |
| 2-MASS J | 10.756 ± 0.021(b) |
| 2-MASS H | 10.384 ± 0.021(b) |
| 2-MASS Ks | 10.305 ± 0.021(b) |
| WISE W1 | 10.274 ± 0.023(f) |
| WISE W2 | 10.332 ± 0.019(f) |
| WISE W3 | 10.279 ± 0.077(f) |
| Stellar parameters (adopted) | |
| Effective temperature Teff [K] | 5350 ± 80(g) |
| Surface gravity log g [cgs] | 4.52 ± 0.15(g) |
| Iron abundance [Fe/H] [dex] | 0.14 ± 0.10(g) |
| Metallicity [M/H] [dex] | 0.15 ± 0.04(g) |
| Rotational velocity υ sin i⋆ [km s−1 ] | 2.5 ± 1.0(g) |
| Macroturbulence υmacro [km s−1 ] | 1.9 ± 0.1(g) |
| Microturbulence υmicro [km s−1 ] | 0.90 ± 0.10(g) |
| Stellar age (gyrochronology) [Gyr] |  (g) |
| Spectral type | G8 |
Notes. (a) EXOFOP-K2: https://exofop.ipac.caltech.edu/k2/ (b) Two Micron All Sky Survey (2MASS). (c)Gaia DR2. (d)Schönrich et al. (2019). Distances for the Gaia RV set with corrected parallaxes (Version 1.0): http://doi.org/10.5281/zenodo.2557803 (e) AAVSO Photometric All-Sky Survey (APASS). (f)AllWISE. (g) Spectral analysis (Sect. 3.1).
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