Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 8.40 Earth masses
Surface gravity around 1.05 g
An orbital period of 3.698 days
Semi-major axis 0.0460 AU
Distance from Earth 521.54 light-years
Earth Similarity Index 0.660
Travel time at Voyager 1 speed 9,197,411 years

Context from the literature

CoRoT-7c is an extrasolar planet which orbits the G-type main sequence star CoRoT-7, located approximately 489 light years away in the constellation Monoceros. It is either a super-Earth or a Neptune-like planet, orbiting at 0.046 AU from the star, taking 3.7 days or 89 hours to make one round trip around the star.

Excerpted from Wikipedia · full article

2 siblings around CoRoT-7

CoRoT-7 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
CoRoT-7 b	Super-Earth	1.68	4.08	0.854	1,756	2009
CoRoT-7 c this	Sub-Neptune	2.83	8.40	3.698	—	2009
CoRoT-7 d	Neptune-like	4.31	17.14	8.966	—	2022

CoRoT-7 c Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.253 R♃

Mass

8.40 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.04 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.660

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility CoRoT

Telescope 0.27 m CoRoT Telescope

Size rank in cohort

Rank by radius

#703of 1978

top 35.5%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-1099 b 2.83 R⊕

Metric	Earth	CoRoT-7 c	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	8.40	317.83
Density (g/cm³)	5.51	2.04	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.400 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 280304863

Gaia DR2

Gaia DR2 3107267177757848576

Gaia DR3

Gaia DR3 3107267177757848576

System

CoRoT-7

Percentile among Sub-Neptune cohort

Radius 2.830 R⊕ · percentile 64 / cohort 1978

Mass 8.400 M⊕ · percentile 58 / cohort 1978

Orbital period 3.70 d · percentile 7 / cohort 1946

Distance 159.91 pc · percentile 26 / cohort 1975

ESI 0.660 · percentile 89 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.698 days

Semi-major axis

0.0460 AU

Eccentricity

0.000

Inclination

80.00 °

Year Length

A year here lasts approximately 3.70 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0460 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

4.000 m/s

Transit mid-time (BJD)

2,454,445.0000

Long. of periastron (ω)

180.00°

Angular separation (arcsec)

0.28800

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.660

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Queloz et al. 2009

Instrument

CoRoT CCD Array

Publication

2009-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2009 at CoRoT (4 shown).

CoRoT-9 b · Gas Giant CoRoT-6 b · Gas Giant CoRoT-7 b · Super-Earth CoRoT-5 b · Gas Giant

Host System: CoRoT-7

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,256 K — cooler than the Sun (5,778 K)

Estimated Age

1.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.864 R☉

Stellar Mass

0.899 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.519 dex

Stellar density

1.963 g/cm³

Systemic radial velocity

31.17 km/s

Rotational v·sin i

3.50 km/s

Metallicity ratio

[M/H]

Distance

159.91 parsec

Light-years 521.54 ly

V-band magnitude

11.73 mag

Voyager-speed travel 9,197,411 yr

Multi-band Host Photometry — 13 bands

Astrometric Data

Parallax

6.225 mas

Total Proper Motion

10.961 mas/yr

PM Right Ascension

10.96 mas/yr

PM Declination

-0.11 mas/yr

Galactic Cartesian (pc)

x = -0.190 · y = 0.982 · z = -0.019

Equatorial (J2000)

RA 100.95617° · Dec -1.06301°

Galactic ℓ, b

213.010° · -2.179°

Ecliptic λ, β

102.006° · -24.047°

HTM-20 index

155434600

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