KELT-10

KELT-10, also known as CD−47°12635, is a sun-like star in the southern constellation Telescopium. It has an apparent magnitude of 10.62,^[3] making it readily visible in telescopes, but not to the naked eye. Parallax measurements from the Gaia spacecraft place the star at a distance of 617 light years;^[2] it is currently receding with a radial velocity of 31.6 km/s.^[5]

KELT-10

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Telescopium[1]
Right ascension	18h 58m 11.6095s[2]
Declination	−47° 00′ 11.664″[2]
Apparent magnitude (V)	+10.62[3]
Characteristics
Spectral type	G0 V[4]
B−V color index	+0.72[3]
Variable type	PT
Astrometry
Radial velocity (Rv)	31.61±1.29[5] km/s
Proper motion (μ)	RA: +1.464 mas/yr[2] Dec.: −15.600 mas/yr[2]
Parallax (π)	5.2834±0.0174 mas[2]
Distance	617 ± 2 ly (189.3 ± 0.6 pc)
Details[4]
Mass	1.07+0.12 −0.15[6] M☉
Radius	1.21+0.05 −0.03 R☉
Luminosity	1.40±0.02[5] L☉
Surface gravity (log g)	4.32+0.02 −0.03 cgs
Temperature	5,948±74 K
Metallicity [Fe/H]	+0.1±0.1 dex
Age	4.5±0.7 Gyr
Other designations
CD−47°12635, KELT-10, TIC 269217040, Gaia DR2 6710517793025165696
Database references
SIMBAD	data

KELT-10 has a stellar classification of G0 V,^[4] indicating that it is a yellow dwarf like the Sun. However, the object is 7% more massive^[6] and 21% larger.^[4] It is also slightly hotter, with an effective temperature of 5,948 K^[4] compared to the Sun's of 5,778 K. The star has a similar age, with an age of 4.5 billion years^[4] and more luminous, having a luminosity 40% greater.^[5] KELT-10's iron abundance is 123% that of the Sun,^[4] consistent with a planetary host. However, this amount is poorly constrained.

Planetary System

In 2015, a "hot Jupiter" orbiting the star was discovered by the KELT-South telescope. KELT-10b orbits at a distance 10 time closer than Mercury orbits the Sun, and is bloated due to its orbit.

The KELT-10 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.68±0.04 MJ	0.052±0.001	4.1662739±0.0000063	0 (assumed)	88.61+0.86 −0.74°	1.4±0.1 RJ