HD 110113
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus[1]
Right ascension 12h 40m 08.781s[2]
Declination −44° 18′ 43.27″[2]
Apparent magnitude (V) 10.063[3]
Characteristics
Evolutionary stage main-sequence
Spectral type G8V[4]
B−V color index 0.697±0.041[1]
Astrometry
Radial velocity (Rv)17.46[2] km/s
Proper motion (μ) RA: −3.723 mas/yr[2]
Dec.: −13.766 mas/yr[2]
Parallax (π)9.4499 ± 0.0158 mas[2]
Distance345.1 ± 0.6 ly
(105.8 ± 0.2 pc)
Details
Mass0.997±0.08[3] M☉
Radius0.968[3] R☉
Luminosity0.91[2] L☉
Surface gravity (log g)4.46±0.05[3] cgs
Temperature5,732±16[3] K
Metallicity [Fe/H]−0.004[2] dex
Rotation20.8±1.2 d[3]
Rotational velocity (v sin i)1.74[3] km/s
Age4.0[3] Gyr
Other designations
CD−43°7805, HD 110113, HIP 61820, PPM 317672, TOI-755[5]
Database references
SIMBADdata

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		 — — —

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 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.
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