Key parameters at a glance

A radius of 2.67 Earth radii
A mass of 7.60 Earth masses
Surface gravity around 1.07 g
An orbital period of 48.135 days
Semi-major axis 0.1939 AU
Distance from Earth 65.85 light-years
Earth Similarity Index 0.680
Travel time at Voyager 1 speed 1,161,298 years
Almost certainly tidally locked to its host star given the close orbit

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 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
GJ 3293 e	Super-Earth	1.63	3.28	13.254	—	2017
GJ 3293 b	Neptune-like	5.19	23.54	30.599	—	2015
GJ 3293 d this	Sub-Neptune	2.67	7.60	48.135	—	2017
GJ 3293 c	Neptune-like	4.87	21.09	122.620	—	2015

GJ 3293 d Planet Profile

Physical Specs

Radius

2.67 R⊕

Radius (Jupiter)

0.238 R♃

Mass

7.60 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.19 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.680

HZ Position Habitable

Controversial No

Discovery

Year 2017

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#904of 1978

top 45.7%

This planet

2.67R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-357 c 2.67 R⊕ Kepler-96 b 2.67 R⊕ K2-26 b 2.67 R⊕

Metric	Earth	GJ 3293 d	Jupiter
Radius (R⊕)	1.00	2.67	11.21
Mass (M⊕)	1.00	7.60	317.83
Density (g/cm³)	5.51	2.19	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	0.59	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	7.600 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 Sub-Neptune cohort

Radius 2.670 R⊕ · percentile 53 / cohort 1978

Mass 7.600 M⊕ · percentile 49 / cohort 1978

Orbital period 48.13 d · percentile 85 / cohort 1946

Distance 20.19 pc · percentile 4 / cohort 1975

ESI 0.680 · percentile 91 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

48.135 days

Semi-major axis

0.1939 AU

Eccentricity

0.120

Inclination

— °

Year Length

A year here lasts approximately 48.13 Earth days (13.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1939 AU.

Eq. Temperature

—

Insolation (S⊕)

0.59

Earth = 1.00

Earth Similarity (ESI)

0.680

0 = alien, 1 = Earth-identical

Within the conservative habitable zone. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Astudillo Defru et al. 2017

Instrument

HARPS Spectrograph

Publication

2017-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at La Silla Observatory (12 shown).

GJ 273 c · Rocky Terrestrial Ross 128 b · Rocky Terrestrial GJ 3138 b · Rocky Terrestrial GJ 3323 c · Super-Earth GJ 3323 b · Rocky Terrestrial GJ 273 b · Super-Earth GJ 3293 e · Super-Earth YZ Cet d · Rocky Terrestrial GJ 3138 c · Super-Earth YZ Cet c · Rocky Terrestrial YZ Cet b · Rocky Terrestrial GJ 3138 d · Sub-Neptune

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]

Distance

20.19 parsec

Light-years 65.85 ly

V-band magnitude

11.95 mag

Voyager-speed travel 1,161,298 yr

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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