CoRoT-7
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros[1] |
| Right ascension | 06h 43m 49.4688s[2] |
| Declination | −01° 03′ 46.817″[2] |
| Apparent magnitude (V) | 11.668[1] |
| Characteristics | |
| CoRoT-7A | |
| Spectral type | G9V[1] |
| CoRoT-7B | |
| Spectral type | M4V[3] |
| Astrometry | |
| Radial velocity (Rv) | +31.174 ± 0.0086[1] km/s |
| Proper motion (μ) | RA: 10.984[2] mas/yr Dec.: -0.040[2] mas/yr |
| Parallax (π) | 6.2676 ± 0.0139[2] mas |
| Distance | 520 ± 1 ly (159.6 ± 0.4 pc) |
| Absolute magnitude (MV) | 5.78[1] |
| Position (relative to CoRoT-7A)[3] | |
| Component | CoRoT-7B |
| Epoch of observation | 2021 |
| Angular distance | 75.7″ |
| Observed separation (projected) | 12160 AU |
| Details | |
| CoRoT-7A | |
| Mass | 0.91 ± 0.03[1] M☉ |
| Radius | 0.82 ± 0.04[1] R☉ |
| Surface gravity (log g) | 4.47 ± 0.10[1] cgs |
| Temperature | 5250 ± 60[1] K |
| Metallicity | [M/H] = 0.12 ± 0.06[1] |
| Rotation | ~23 days[4] |
| Rotational velocity (v sin i) | <3.5[1] km/s |
| Age | (1.2–2.3) × 109[1] years |
| CoRoT-7B | |
| Mass | 0.23[3] M☉ |
| Other designations | |
2MASS J06434947-0103468, TYC 4799-1733-1, GSC 04799-01733 | |
| CoRoT-7A: Gaia EDR3 3107267177757848576 | |
| CoRoT-7B: Gaia EDR3 3107267212116737792 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Coordinates: 
06h 43m 49.0s, −01° 03′ 46.0″
CoRoT-7 (TYC 4799-1733-1) is a binary star system. The primary, CoRoT-7A is a G-type main sequence star, slightly smaller, cooler, and younger than the Sun. It has an apparent magnitude of 11.67, fainter than Proxima Centauri (mag. 11.05), the nearest star to the Sun. This star is approximately 520 light-years away from the Solar System[2] in the constellation Monoceros (the Unicorn).[5]
The comoving companion CoRoT-7B was discovered in 2021. It is a red dwarf star.[3]
Location and properties[]
The star is located in the LRa01 field of view of the CoRoT spacecraft. It is about 500 light years from Earth. According to the project website, this field is in the Monoceros constellation.[5] Published data[6] lists the stellar properties as being a G9V yellow dwarf with a temperature of 5250 K, a radius of about 82% of the Sun and a mass of about 91% of the Sun.[1] But other sources have listed it as a (K0V) orange dwarf.[7] The metallicity is 0.12 ± 0.06. The star is estimated to be about 150 parsecs away and with an age in the range 1.2 – 2.3 billion years, is younger than our own star which has an age of 4.6 billion years.[1] The rotation period of the star, inferred by the lightcurve obtained by CoRoT, is around 23 days.
Planetary system[]
The primary star is orbited by the super-Earth exoplanets CoRoT-7b and CoRoT-7c, both discovered in 2009.[4] The existence of a possible third planet CoRoT-7d, detected in a published study,[8] remains unconfirmed and dubious.[9] The discovery of the inner planet was made using the transit method by the CoRoT program. CoRoT-7b is notable for its relatively small size, compared to other exoplanets known at the time.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | from 2.3 to 8.5 M
|