HD 110113

HD 110113
Observation data
Epoch J2000.0      Equinox ICRS
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
Distance345.1 ± 0.6 ly
(105.8 ± 0.2 pc)
Details
Mass0.997±0.08 M☉
Radius0.968 R☉
Luminosity0.91 L☉
Surface gravity (log g)4.46±0.05 cgs
Temperature5,732±16 K
Metallicity [Fe/H]−0.004 dex
Rotation20.8±1.2 d
Rotational velocity (v sin i)1.74 km/s
Age4.0 Gyr
Other designations
CD−43°7805, HD 110113, HIP 61820, PPM 317672, TOI-755
Database references
SIMBADdata

HD 110113, also known as TOI-755, is a star with a pair of orbiting exoplanets in the constellation Centaurus. With an apparent visual magnitude of 10.063, 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. A planetary system was discovered orbiting this star in 2021.

The spectrum of HD 110113 presents as a G-type main-sequence star, or yellow dwarf, with a stellar classification of G8V. 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.

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.

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		 — — —

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644
  2. 1 2 3 4 5 6 7 8 9 10 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 Osborn, H. P.; et al. (2021), "A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113", Monthly Notices of the Royal Astronomical Society, 502 (4): 4842–4857, arXiv:2101.04745, Bibcode:2021MNRAS.502.4842O, doi:10.1093/mnras/stab182
  4. 1 2 Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy, University of Michigan. 2. Bibcode:1978mcts.book.....H.
  5. ↑ "HD 110113". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-12-22.