Key parameters at a glance
- A radius of 13.90 Earth radii
- A mass of 276.51 Earth masses
- Surface gravity around 1.43 g
- An orbital period of 996.000 days
- Semi-major axis 2.1530 AU
- Distance from Earth 64.61 light-years
- Earth Similarity Index 0.297
- Travel time at Voyager 1 speed 1,139,430 years
1 sibling around 7 CMa
7 CMa c 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 | Gas Giant | 13.40 | 587.99 | 735.100 | — | 2011 |
| 7 CMa c this | Gas Giant | 13.90 | 276.51 | 996.000 | — | 2019 |
7 CMa c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#456of 1771
top 25.7%
This planet
13.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | 7 CMa c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.90 | 11.21 |
| Mass (M⊕) | 1.00 | 276.51 | 317.83 |
| Density (g/cm³) | 5.51 | 0.57 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.43 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 276.512 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 276.512 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
HD
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
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 2.73 Earth years on a nearly circular orbit at a mean orbital distance of 2.1530 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.297
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Luque et al. 2019Instrument
Multiple Instruments
Publication
2019-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at Multiple Observatories (8 shown).
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]
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
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