Key parameters at a glance

A radius of 14.57 Earth radii
A mass of 718.30 Earth masses
Surface gravity around 3.38 g
An orbital period of 2.725 days
Semi-major axis 0.0417 AU
Distance from Earth 4,562.38 light-years
Earth Similarity Index 0.352
Travel time at Voyager 1 speed 80,457,596 years

CoRoT-21 b Planet Profile

Physical Specs

Radius

14.57 R⊕

Radius (Jupiter)

1.300 R♃

Mass

718.30 M⊕

Mass (Jupiter)

2.260 M♃

Density

1.36 g/cm³

Surface Gravity

3.38 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.352

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Transit

Facility CoRoT

Telescope 0.27 m CoRoT Telescope

Size rank in cohort

Rank by radius

#270of 1771

top 15.2%

This planet

14.57R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HATS-16 b 14.57 R⊕ WASP-135 b 14.57 R⊕ K2-132 b 14.57 R⊕

Metric	Earth	CoRoT-21 b	Jupiter
Radius (R⊕)	1.00	14.57	11.21
Mass (M⊕)	1.00	718.30	317.83
Density (g/cm³)	5.51	1.36	1.33
Surface Gravity (g)	1.00	3.38	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	718.296 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 280420719

Gaia DR2

Gaia DR2 3107471240236703104

Gaia DR3

Gaia DR3 3107471240236703104

System

CoRoT-21

Percentile among Gas Giant cohort

Radius 14.572 R⊕ · percentile 84 / cohort 1771

Mass 718.296 M⊕ · percentile 58 / cohort 1747

Orbital period 2.72 d · percentile 13 / cohort 1533

Distance 1,398.83 pc · percentile 89 / cohort 1759

ESI 0.352 · percentile 72 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.725 days

Semi-major axis

0.0417 AU

Eccentricity

0.000

Inclination

86.80 °

Year Length

A year here lasts approximately 2.72 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0417 AU.

Transit Fingerprint

Duration

4.760 h

Impact parameter b

0.250

Rp / R★

0.067000

Transit midpoint (BJD)

2,454,399.0282

Extended Orbital Architecture

Planet / star radius ratio

0.067000

Semi-major axis / stellar radius

4.600

Impact parameter (b)

0.250

RV semi-amplitude (K)

274.000 m/s

Transit mid-time (BJD)

2,454,399.0282

Angular separation (arcsec)

0.02980

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.352

0 = alien, 1 = Earth-identical

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

P Auml Tzold et al. 2012

Instrument

CoRoT CCD Array

Publication

2012-09

Observation locale

Space

Host System: CoRoT-21

Spectral Class

F-type yellow-white

Effective Temperature

6,200 K — hotter than the Sun (5,778 K)

Estimated Age

4.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.950 R☉

Stellar Mass

1.290 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

3.700 dex

Stellar density

0.255 g/cm³

Systemic radial velocity

101.00 km/s

Rotational v·sin i

11.00 km/s

Metallicity ratio

[Fe/H]

Distance

1,398.83 parsec

Light-years 4,562.38 ly

V-band magnitude

16.06 mag

Voyager-speed travel 80,457,596 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.715 mas

Total Proper Motion

11.717 mas/yr

PM Right Ascension

-11.58 mas/yr

PM Declination

1.80 mas/yr

Galactic Cartesian (pc)

x = -0.192 · y = 0.981 · z = -0.005

Equatorial (J2000)

RA 101.05262° · Dec -0.29915°

Galactic ℓ, b

212.374° · -1.744°

Ecliptic λ, β

102.042° · -23.277°

HTM-20 index

5608695