Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 114.42 Earth masses
Surface gravity around 0.66 g
An orbital period of 57.435 days
Semi-major axis 0.2500 AU
Distance from Earth 76.23 light-years
Earth Similarity Index 0.253
Travel time at Voyager 1 speed 1,344,244 years

HIP 12961 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.180 R♃

Mass

114.42 M⊕

Mass (Jupiter)

0.360 M♃

Density

0.27 g/cm³

Surface Gravity

0.66 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.253

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HIP 12961 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	114.42	317.83
Density (g/cm³)	5.51	0.27	1.33
Surface Gravity (g)	1.00	0.66	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	114.419 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 12961

TIC

TIC 204614039

Gaia DR2

Gaia DR2 5077642283022422656

Gaia DR3

Gaia DR3 5077642283022422656

System

HIP 12961

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 114.419 M⊕ · percentile 7 / cohort 1747

Orbital period 57.44 d · percentile 51 / cohort 1533

Distance 23.37 pc · percentile 5 / cohort 1759

ESI 0.253 · percentile 45 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

57.435 days

Semi-major axis

0.2500 AU

Eccentricity

0.170

Inclination

— °

Year Length

A year here lasts approximately 57.44 Earth days (15.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.253

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Forveille et al. 2011

Instrument

HARPS Spectrograph

Publication

2011-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at La Silla Observatory (12 shown).

GJ 3634 b · Sub-Neptune HD 10180 f · Neptune-like HD 10180 e · Neptune-like GJ 676 A b · Gas Giant HD 204313 b · Gas Giant HD 28254 b · Gas Giant HD 1690 b · Gas Giant HD 10180 h · Neptune-like HD 113538 c · Gas Giant HD 25171 b · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant

Host System: HIP 12961

Spectral Class

M-type red dwarf

Effective Temperature

3,901 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.650 R☉

Stellar Mass

0.690 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

4.650 dex

Stellar density

3.029 g/cm³

Metallicity ratio

[Fe/H]

Distance

23.37 parsec

Light-years 76.23 ly

V-band magnitude

10.25 mag

Voyager-speed travel 1,344,244 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

42.759 mas

Total Proper Motion

326.883 mas/yr

PM Right Ascension

294.92 mas/yr

PM Declination

140.97 mas/yr

Galactic Cartesian (pc)

x = 0.687 · y = 0.612 · z = -0.392

Equatorial (J2000)

RA 41.68007° · Dec -23.08600°

Galactic ℓ, b

210.539° · -63.650°

Ecliptic λ, β

30.531° · -37.091°

HTM-20 index

-342072678

Similar Worlds

TOI-7149 b

Gas Giant · M-type red dwarf

Radius 13.20 R⊕ · 411.4 ly

GJ 876 b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 15.2 ly

GJ 317 b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 49.6 ly

GJ 463 b

Gas Giant · M-type red dwarf

Radius 13.10 R⊕ · 59.9 ly

GJ 896 A b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 20.4 ly

GJ 328 b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 66.9 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries La Silla Observatory Mission M-type red dwarf Hosts