Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 12h 40m 08.781s[1]
Declination −44° 18′ 43.27″[1]
Apparent magnitude (V) 10.063[2]
Evolutionary stage main-sequence star
Spectral type G5V[citation needed]
Radial velocity (Rv)17.13[3] km/s
Proper motion (μ) RA: −3.723[1] mas/yr
Dec.: −13.766[1] mas/yr
Parallax (π)9.4499 ± 0.0158[1] mas
Distance345.1 ± 0.6 ly
(105.8 ± 0.2 pc)
Mass0.997±0.08 M
Radius0.968 R
Luminosity0.928[3] L
Surface gravity (log g)4.46 cgs
Temperature5,732 K
Rotation20.8 d
Rotational velocity (v sin i)1.74 km/s
Age4.0 Gyr
Other designations
CD−43°7805, HD 110113, HIP 61820
Database references

TOI-755, also known as HD 110113, is a Sun-like star with a distance from the Solar System of about 346.5 light-years (106.2 parsecs) and located in the Centaurus constellation. The discovery by Osborn et al. was published at the Monthly Notices of the Royal Astronomical Society in 2021.[2]


TOI-755 has been classified as a G-type main-sequence star (yellow dwarf). It has a temperature of 5,730 kelvins (5,460 °C), and a solar mass of almost 1, similar to the Sun.[2]

Planetary system

The two planets that are orbiting TOI-755, TOI-755b and TOI-755c, were suspected since 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.[2]

The TOI-755 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 4.54 ± 0.64 M🜨 0.035 2.541+0.0005
2.05 ± 0.12 R🜨
c (unconfirmed) 10.49 ± 1.2 M🜨 0.068+0.001


  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. ^ a b c d e Osborn, H. P.; Armstrong, D. J.; Adibekyan, V.; Collins, K. A.; Delgado-Mena, E.; Howell, S. B.; Hellier, C.; King, G. W.; Lillo-Box, J.; Nielsen, L. D.; Otegi, J. F.; Santos, N. C.; Ziegler, C.; Anderson, D. R.; Briceño, C.; Burke, C.; Bayliss, D.; Barrado, D.; Bryant, E. M.; Brown, D J A.; Barros, S C C.; Bouchy, F.; Caldwell, D. A.; Conti, D. M.; Díaz, R. F.; Dragomir, D.; Deleuil, M.; Demangeon, O D S.; Dorn, C.; et al. (2021), "A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113", Monthly Notices of the Royal Astronomical Society, arXiv:2101.04745, Bibcode:2021MNRAS.tmp..240O, doi:10.1093/mnras/stab182
  3. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.