Astronomy:TOI-755
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Short description: Star
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 star |
| Spectral type | G5V[citation needed] |
| Astrometry | |
| 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 |
| Distance | 345.1 ± 0.6 ly (105.8 ± 0.2 pc) |
| Details[2] | |
| Mass | 0.997±0.08 M☉ |
| Radius | 0.968 R☉ |
| Luminosity | 0.928[3] L☉ |
| Surface gravity (log g) | 4.46 cgs |
| Temperature | 5,732 K |
| Rotation | 20.8 d |
| Rotational velocity (v sin i) | 1.74 km/s |
| Age | 4.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
Characteristics
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]
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Osborn, H. P.; Armstrong, D. J.; Adibekyan, V.; Collins, K. A.; Delgado-Mena, E.; Howell, S. B.; Hellier, C.; King, G. W. et al. (2021), "A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113", Monthly Notices of the Royal Astronomical Society, doi:10.1093/mnras/stab182, Bibcode: 2021MNRAS.tmp..240O
- ↑ 3.0 3.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
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