Key parameters at a glance
- A radius of 10.80 Earth radii
- A mass of 82.00 Earth masses
- Surface gravity around 0.70 g
- An orbital period of 600.100 days
- Semi-major axis 1.1120 AU
- Distance from Earth 33.85 light-years
- Earth Similarity Index 0.291
- Travel time at Voyager 1 speed 597,010 years
GJ 649 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1686of 1771
top 95.1%
This planet
10.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | GJ 649 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.80 | 11.21 |
| Mass (M⊕) | 1.00 | 82.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.36 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.70 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 82.000 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 83043
TIC
TIC 236743275
Gaia DR2
Gaia DR2 4572835535272064768
Gaia DR3
Gaia DR3 4572835535272627712
System
GJ 649
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.64 Earth years on a nearly circular orbit at a mean orbital distance of 1.1120 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
9.710 m/s
Transit mid-time (BJD)
2,459,045.4000
Long. of periastron (ω)
3.00°
Angular separation (arcsec)
107.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.291
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Johnson et al. 2010Instrument
HIRES Spectrometer
Publication
2010-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at W. M. Keck Observatory (12 shown).
Host System: GJ 649
Spectral Class
M-type red dwarf
Effective Temperature
3,734 K — cooler than the Sun (5,778 K)
Estimated Age
0.44 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.500 R☉
Stellar Mass
0.510 M☉
Metallicity [Fe/H]
-0.15
Extended Stellar Properties
Surface gravity (log g)
4.760 dex
Stellar density
5.260 g/cm³
Systemic radial velocity
3.57 km/s
Rotation period
24.89 days
Activity index (log R'HK)
-4.925
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
96.314 mas
Total Proper Motion
520.850 mas/yr
PM Right Ascension
-115.48 mas/yr
PM Declination
-507.89 mas/yr
Galactic Cartesian (pc)
x = -0.240 · y = -0.868 · z = 0.434
Equatorial (J2000)
RA 254.53632° · Dec 25.74197°
Galactic ℓ, b
46.521° · 35.337°
Ecliptic λ, β
248.938° · 48.057°
HTM-20 index
-215718926
Observation Record
Photometric series
1
RV measurements
1
Stellar spectra
2
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