Key parameters at a glance

A radius of 2.63 Earth radii
A mass of 7.40 Earth masses
Surface gravity around 1.07 g
An orbital period of 3.651 days
Semi-major axis 0.0260 AU
Distance from Earth 33.44 light-years
Earth Similarity Index 0.686
Travel time at Voyager 1 speed 589,699 years
Almost certainly tidally locked to its host star given the close orbit

GJ 1265 b Planet Profile

Physical Specs

Radius

2.63 R⊕

Radius (Jupiter)

0.234 R♃

Mass

7.40 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.24 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.686

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#969of 1978

top 48.9%

This planet

2.63R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1241 b 2.63 R⊕ GJ 3473 c 2.63 R⊕ Kepler-319 c 2.63 R⊕

Metric	Earth	GJ 1265 b	Jupiter
Radius (R⊕)	1.00	2.63	11.21
Mass (M⊕)	1.00	7.40	317.83
Density (g/cm³)	5.51	2.24	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	7.400 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 471012766

Gaia DR2

Gaia DR2 6825822095663585536

Gaia DR3

Gaia DR3 6825822095663585536

System

GJ 1265

Percentile among Sub-Neptune cohort

Radius 2.630 R⊕ · percentile 50 / cohort 1978

Mass 7.400 M⊕ · percentile 46 / cohort 1978

Orbital period 3.65 d · percentile 7 / cohort 1946

Distance 10.25 pc · percentile 2 / cohort 1975

ESI 0.686 · percentile 91 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.651 days

Semi-major axis

0.0260 AU

Eccentricity

0.040

Inclination

— °

Year Length

A year here lasts approximately 3.65 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0260 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.686

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Luque et al. 2018

Instrument

CARMENES

Publication

2018-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at Calar Alto Observatory (2 shown).

GJ 3779 b · Sub-Neptune HD 180617 b · Sub-Neptune

Host System: GJ 1265

Spectral Class

M-type red dwarf

Effective Temperature

3,236 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.192 R☉

Stellar Mass

0.178 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

5.090 dex

Systemic radial velocity

-24.30 km/s

Rotational v·sin i

2.00 km/s

Rotation period

70.00 days

Metallicity ratio

[Fe/H]

Distance

10.25 parsec

Light-years 33.44 ly

V-band magnitude

14.01 mag

Voyager-speed travel 589,699 yr

Multi-band Host Photometry — 9 bands

Astrometric Data

Parallax

97.509 mas

Total Proper Motion

909.991 mas/yr

PM Right Ascension

856.89 mas/yr

PM Declination

-306.31 mas/yr

Galactic Cartesian (pc)

x = 0.852 · y = -0.426 · z = -0.304

Equatorial (J2000)

RA 333.43247° · Dec -17.68706°

Galactic ℓ, b

39.080° · -52.514°

Ecliptic λ, β

329.007° · -6.272°

HTM-20 index

-1941051363