Key parameters at a glance
- A radius of 4.87 Earth radii
- A mass of 21.09 Earth masses
- Surface gravity around 0.89 g
- An orbital period of 122.620 days
- Semi-major axis 0.3618 AU
- Distance from Earth 65.85 light-years
- Earth Similarity Index 0.484
- Travel time at Voyager 1 speed 1,161,298 years
Context from the literature
GJ 3293 is a star in the constellation of Eridanus, that is orbited by four planets, two of which are located within the star's habitable zone. It is located at the celestial coordinates: Right Ascension 04h 28m 35.71911s, Declination −25° 10′ 09.2979″. With an apparent visual magnitude of 11.96, this star is too faint to be seen with the naked eye. It can be viewed with a telescope having an aperture of at least 4 in (10 cm). The estimated distance to GJ 3293 is 65.9 light-years, based on its stellar parallax. GJ 3293 is significantly smaller and cooler than the Sun.
Excerpted from Wikipedia · full article
3 siblings around GJ 3293
GJ 3293 c shares its host star with 3 other confirmed planets. Side-by-side measurements below.
GJ 3293 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#403of 574
top 70.0%
This planet
4.87R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | GJ 3293 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.87 | 11.21 |
| Mass (M⊕) | 1.00 | 21.09 | 317.83 |
| Density (g/cm³) | 5.51 | 1.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.89 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.17 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 21.090 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 178872239
Gaia DR2
Gaia DR2 4893118771316702720
Gaia DR3
Gaia DR3 4893118771316702720
System
GJ 3293
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 122.62 Earth days (33.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3618 AU.
Eq. Temperature
—
Insolation (S⊕)
0.17
Earth = 1.00
Earth Similarity (ESI)
0.484
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Astudillo Defru et al. 2015Instrument
HARPS Spectrograph
Publication
2015-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2015 at La Silla Observatory (10 shown).
Host System: GJ 3293
Spectral Class
M-type red dwarf
Effective Temperature
3,466 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.404 R☉
Stellar Mass
0.420 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.781 dex
Stellar density
6.900 g/cm³
Systemic radial velocity
13.30 km/s
Rotation period
41.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
49.500 mas
Total Proper Motion
492.254 mas/yr
PM Right Ascension
-81.43 mas/yr
PM Declination
-485.47 mas/yr
Galactic Cartesian (pc)
x = 0.351 · y = 0.834 · z = -0.425
Equatorial (J2000)
RA 67.14844° · Dec -25.17134°
Galactic ℓ, b
223.541° · -41.613°
Ecliptic λ, β
59.468° · -46.218°
HTM-20 index
-540982232
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