HD 110113

HD 110113
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	12h 40m 08.781s
Declination	−44° 18′ 43.27″
Apparent magnitude (V)	10.063
Characteristics
Evolutionary stage	main-sequence
Spectral type	G8V
B−V color index	0.697±0.041
Astrometry
Radial velocity (Rv)	17.46 km/s
Proper motion (μ)	RA: −3.723 mas/yr ; Dec.: −13.766 mas/yr
Parallax (π)	9.4499 ± 0.0158 mas
Distance	345.1 ± 0.6 ly ; (105.8 ± 0.2 pc)
Details
Mass	0.997±0.08 M☉
Radius	0.968 R☉
Luminosity	0.91 L☉
Surface gravity (log g)	4.46±0.05 cgs
Temperature	5,732±16 K
Metallicity [Fe/H]	−0.004 dex
Rotation	20.8±1.2 d
Rotational velocity (v sin i)	1.74 km/s
Age	4.0 Gyr
Other designations
	CD−43°7805, HD 110113, HIP 61820, PPM 317672, TOI-755
Database references
SIMBAD	data

HD 110113, also known as TOI-755, is a star with a pair of orbiting exoplanets in the Centaurus constellation. With an apparent visual magnitude of 10.063,^[3] it is much too faint to be viewed with the naked eye. The system is located at a distance from the Solar System of about 346.5 light-years (106.2 parsecs). It is drifting further away with a heliocentric radial velocity of 17 km/s.^[2] A planetary system was discovered orbiting this star in 2021.^[3]

The spectrum of HD 110113 presents as a G-type main-sequence star, or yellow dwarf, with a stellar classification of G8V.^[4] It has an estimated age of four billion years and is spinning slowly with a rotation period of 20.8 days. The star is considered a solar analog, having nearly the same mass and size as the Sun. It radiating 91% of the Sun's luminosity from its photosphere at an effective temperature of 5,732 K. The star displays rotationally-modulated variability that is indicative of star spots.^[3]

Planetary system

The two candidate planets orbiting TOI-755 – TOI-755b and TOI-755c – were announced in 2021. TOI-755b's temperature is over 1,570 K (1,300 °C) and TOI-755c's temperature is cooler at around 1,260 K (990 °C), which means they are Hot Neptunes.^[3]

The HD 110113 planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	4.54 ± 0.64 $M$ _🜨	0.035	2.541^+0.0005 _−0.001	—	—	2.05 ± 0.12 $R$ _🜨
c	10.49 ± 1.2 $M$ _🜨	0.068^+0.001 _−0.002	6.744^+0.008 _−0.009	—	—	—