Key parameters at a glance

A radius of 3.64 Earth radii
A mass of 12.90 Earth masses
Surface gravity around 0.97 g
An orbital period of 55.199 days
Semi-major axis 0.2430 AU
Distance from Earth 77.11 light-years
Earth Similarity Index 0.575
Travel time at Voyager 1 speed 1,359,912 years

HIP 107772 b Planet Profile

Physical Specs

Radius

3.64 R⊕

Radius (Jupiter)

0.325 R♃

Mass

12.90 M⊕

Mass (Jupiter)

0.041 M♃

Density

1.47 g/cm³

Surface Gravity

0.97 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.575

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#120of 1978

top 6.0%

This planet

3.64R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-565 b 3.64 R⊕ Kepler-1635 b 3.64 R⊕ Kepler-608 b 3.64 R⊕

Metric	Earth	HIP 107772 b	Jupiter
Radius (R⊕)	1.00	3.64	11.21
Mass (M⊕)	1.00	12.90	317.83
Density (g/cm³)	5.51	1.47	1.33
Surface Gravity (g)	1.00	0.97	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	12.900 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 107772

TIC

TIC 197602069

Gaia DR2

Gaia DR2 6572326052043362304

Gaia DR3

Gaia DR3 6572326052043362304

System

HIP 107772

Percentile among Sub-Neptune cohort

Radius 3.640 R⊕ · percentile 94 / cohort 1978

Mass 12.900 M⊕ · percentile 87 / cohort 1978

Orbital period 55.20 d · percentile 87 / cohort 1946

Distance 23.64 pc · percentile 6 / cohort 1975

ESI 0.575 · percentile 80 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

55.199 days

Semi-major axis

0.2430 AU

Eccentricity

0.180

Inclination

— °

Year Length

A year here lasts approximately 55.20 Earth days (15.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2430 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.575

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2020

Instrument

Multiple Instruments

Publication

2020-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2020 at Multiple Observatories (12 shown).

GJ 3473 c · Sub-Neptune HIP 38594 b · Sub-Neptune HD 216520 c · Sub-Neptune HD 216520 b · Sub-Neptune GJ 480 b · Sub-Neptune HIP 4845 b · Sub-Neptune HD 190007 b · Neptune-like GJ 687 c · Neptune-like GJ 2056 b · Neptune-like HD 238090 b · Sub-Neptune HIP 48714 b · Neptune-like HIP 38594 c · Neptune-like

Host System: HIP 107772

Spectral Class

M-type red dwarf

Effective Temperature

4,006 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.514 R☉

Stellar Mass

0.630 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.735 dex

Stellar density

4.949 g/cm³

Systemic radial velocity

-10.03 km/s

Distance

23.64 parsec

Light-years 77.11 ly

V-band magnitude

10.56 mag

Voyager-speed travel 1,359,912 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

42.266 mas

Total Proper Motion

337.807 mas/yr

PM Right Ascension

-244.82 mas/yr

PM Declination

232.76 mas/yr

Galactic Cartesian (pc)

x = 0.634 · y = -0.404 · z = -0.659

Equatorial (J2000)

RA 327.49771° · Dec -41.24404°

Galactic ℓ, b

0.053° · -50.426°

Ecliptic λ, β

315.051° · -26.369°

HTM-20 index

135661755