Key parameters at a glance
- A radius of 14.20 Earth radii
- A mass of 172.58 Earth masses
- Surface gravity around 0.86 g
- An orbital period of 2,965.000 days
- Semi-major axis 2.9210 AU
- Distance from Earth 51.93 light-years
- Earth Similarity Index 0.259
- Travel time at Voyager 1 speed 915,744 years
GJ 9773 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#334of 1771
top 18.8%
This planet
14.20R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | GJ 9773 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.20 | 11.21 |
| Mass (M⊕) | 1.00 | 172.58 | 317.83 |
| Density (g/cm³) | 5.51 | 0.33 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.86 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 172.581 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 109638
TIC
TIC 468309671
Gaia DR2
Gaia DR2 2723557788822526720
Gaia DR3
Gaia DR3 2723557788822526720
System
GJ 9773
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 8.12 Earth years on a mildly elliptical path at a mean orbital distance of 2.9210 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
15.110 m/s
Transit mid-time (BJD)
2,459,362.0000
Long. of periastron (ω)
99.00°
Angular separation (arcsec)
183.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.259
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Morales et al. 2025Instrument
CARMENES
Publication
2025-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at Calar Alto Observatory (8 shown).
Host System: GJ 9773
Spectral Class
M-type red dwarf
Effective Temperature
3,528 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.362 R☉
Stellar Mass
0.358 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.847 dex
Stellar density
9.548 g/cm³
Rotational v·sin i
2.00 km/s
Rotation period
56.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 8 bands
Astrometric Data
Parallax
62.781 mas
Total Proper Motion
678.873 mas/yr
PM Right Ascension
106.80 mas/yr
PM Declination
-670.42 mas/yr
Galactic Cartesian (pc)
x = 0.882 · y = -0.447 · z = 0.149
Equatorial (J2000)
RA 333.15023° · Dec 8.55034°
Galactic ℓ, b
70.112° · -37.536°
Ecliptic λ, β
338.322° · 18.305°
HTM-20 index
1650008810
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