Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 587.99 Earth masses
Surface gravity around 3.27 g
An orbital period of 735.100 days
Semi-major axis 1.7580 AU
Distance from Earth 64.61 light-years
Earth Similarity Index 0.360
Travel time at Voyager 1 speed 1,139,430 years

1 sibling around 7 CMa

7 CMa b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
7 CMa b this	Gas Giant	13.40	587.99	735.100	—	2011
7 CMa c	Gas Giant	13.90	276.51	996.000	—	2019

7 CMa b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.200 R♃

Mass

587.99 M⊕

Mass (Jupiter)

1.850 M♃

Density

1.34 g/cm³

Surface Gravity

3.27 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.360

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	7 CMa b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	587.99	317.83
Density (g/cm³)	5.51	1.34	1.33
Surface Gravity (g)	1.00	3.27	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	587.986 M⊕	Lower bound from radial-velocity fitting.
Computed mass	587.986 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD 47205

HIP

HIP 31592

TIC

TIC 48237215

Gaia DR2

Gaia DR2 2939555954747554176

Gaia DR3

Gaia DR3 2939555954755196160

System

7 CMa

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 587.986 M⊕ · percentile 53 / cohort 1747

Orbital period 735.10 d · percentile 73 / cohort 1533

Distance 19.81 pc · percentile 4 / cohort 1759

ESI 0.360 · percentile 73 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

735.100 days

Semi-major axis

1.7580 AU

Eccentricity

0.060

Inclination

90.00 °

Year Length

A year here lasts about 2.01 Earth years on a nearly circular orbit at a mean orbital distance of 1.7580 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.360

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Wittenmyer et al. 2011

Instrument

UCLES Spectrograph

Publication

2011-12

Observation locale

Ground

Host System: 7 CMa

Spectral Class

K-type orange

Effective Temperature

4,826 K — cooler than the Sun (5,778 K)

Estimated Age

4.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

4.870 R☉

Stellar Mass

1.340 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

3.190 dex

Rotational v·sin i

1.15 km/s

Metallicity ratio

[Fe/H]

Distance

19.81 parsec

Light-years 64.61 ly

V-band magnitude

3.95 mag

Voyager-speed travel 1,139,430 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

50.457 mas

Total Proper Motion

95.623 mas/yr

PM Right Ascension

61.99 mas/yr

PM Declination

-72.81 mas/yr

Galactic Cartesian (pc)

x = -0.150 · y = 0.932 · z = -0.330

Equatorial (J2000)

RA 99.17128° · Dec -19.25618°

Galactic ℓ, b

228.689° · -11.796°

Ecliptic λ, β

101.738° · -42.322°

HTM-20 index

-730676201

Similar Worlds

HD 93083 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 93.0 ly

Kepler-48 e

Gas Giant · K-type orange

Radius 13.40 R⊕ · 1,000.4 ly

HD 47366 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 275.1 ly

HIP 114933 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 331.9 ly

HD 114783 c

Gas Giant · K-type orange

Radius 13.40 R⊕ · 68.7 ly

HD 4732 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 178.7 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Anglo-Australian Telescope Mission K-type orange Hosts