# COROT-1b

Extrasolar planet Parent star Orbital elements List of extrasolar planets Size comparison of COROT-1b with Jupiter. Star COROT-1[2] Constellation Monoceros Right ascension (α) 6h 48m 19.17s[3] Declination (δ) −3° 06′ 07.78″[3] Distance 1,560 ly (480 pc) Spectral type G0V[2][3] Semimajor axis (a) 0.025±0.001[4] AU Eccentricity (e) ~0[3] Orbital period (P) 1.5089557±0.0000064[3] d (36.214936 h) Inclination (i) 85.1±0.5[3]° Time of transit (Tt) 2454159.4532±0.0001[3] JD Mass (m) 1.03±0.12[3] MJ Radius (r) 1.49±0.08[3] RJ Density (ρ) 380±50[3] kg m−3 Bond Albedo (Ab) <0.08 Surface gravity (g) 11.5[5] m/s² Temperature (T) 1,898±50[3] Discovery date 1 May 2007 Discoverer(s) Barge et al. Discovery method Transit Other detection methods Radial velocity, Reflection/emission modulations Discovery site France Discovery status Confirmed CoRoT-Exo-1b Database references Extrasolar Planets Encyclopaedia data SIMBAD data Exoplanet Archive data Open Exoplanet Catalogue data

COROT-1b[2] (previously named COROT-Exo-1b)[1] is an extrasolar planet approximately 1,560 light-years away in the constellation of Monoceros. The planet was discovered orbiting the yellow dwarf star COROT-1 in May 2007. The planet was the first discovery by the French-led COROT Mission.

## Detection and discovery

Artist's impression of COROT-1b passing in front of its parent star.

The planet was announced by the COROT mission (a CNES project with European Space Agency participation). The planet is a large hot Jupiter, about 1.49 times the radius of Jupiter and approximately 1.03 times as massive, based on ground observations of the star. Its large size is due to its low density combined with the intense heating of its parent star causing the outer layers of the atmosphere to bloat.

## Observation of phases

In May 2009 COROT-1b became the first extrasolar planet for which optical (as opposed to infrared) observations of phases were reported.[6] These observations suggest that there is not significant heat transfer between the (tidally locked) night and day sides of the planet.[7]

5. ^ Calculated using Newtonian gravity: $\textstyle g=\frac{GM}{R^2}$