Astronomy:HD 110113

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Short description: Star
HD 110113
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas/yr
Dec.: −13.766[2] mas/yr
Parallax (π)9.4499 ± 0.0158[2] mas
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. 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 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, doi:10.1093/mnras/stab182, Bibcode2021MNRAS.502.4842O 
  4. 4.0 4.1 Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy, University of Michigan 2. Bibcode1978mcts.book.....H. 
  5. "HD 110113". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+110113.