HD 110113
HD 110113, also known as TOI-755, 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. A planetary system was discovered orbiting this star in 2021.[2]
| 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] |
| Characteristics | |
| Evolutionary stage | main-sequence |
| Spectral type | G8V[3] |
| Astrometry | |
| Radial velocity (Rv) | 17.46[1] km/s |
| Proper motion (μ) | RA: −3.723[1] mas/yr Dec.: −13.766[1] mas/yr |
| Parallax (π) | 9.4499 ± 0.0158 mas[1] |
| Distance | 345.1 ± 0.6 ly (105.8 ± 0.2 pc) |
| Details | |
| Mass | 0.997±0.08[2] M☉ |
| Radius | 0.968[2] R☉ |
| Luminosity | 0.91[1] L☉ |
| Surface gravity (log g) | 4.46[2] cgs |
| Temperature | 5,732[2] K |
| Metallicity [Fe/H] | −0.004[1] dex |
| Rotation | 20.8 d[2] |
| Rotational velocity (v sin i) | 1.74[2] km/s |
| Age | 4.0[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Characteristics
HD 110113 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]
| 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
- 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.
- 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, 502 (4): 4842–4857, arXiv:2101.04745, Bibcode:2021MNRAS.502.4842O, doi:10.1093/mnras/stab182
- 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.
2021 in space | ||
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| Space probe and telescope launches  |
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| Selected NEOs | ||
| Exoplanets |
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