Open Access

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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