Key parameters at a glance

A radius of 3.89 Earth radii
A mass of 14.40 Earth masses
Surface gravity around 0.95 g
An orbital period of 34.150 days
Semi-major axis 0.1760 AU
Distance from Earth 68.81 light-years
Earth Similarity Index 0.553
Travel time at Voyager 1 speed 1,213,472 years
Almost certainly tidally locked to its host star given the close orbit

HIP 4845 b Planet Profile

Physical Specs

Radius

3.89 R⊕

Radius (Jupiter)

0.347 R♃

Mass

14.40 M⊕

Mass (Jupiter)

0.045 M♃

Density

1.34 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.553

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#28of 1978

top 1.4%

This planet

3.89R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 42618 b 3.89 R⊕ TOI-942 b 3.89 R⊕ HD 20003 c 3.89 R⊕

Metric	Earth	HIP 4845 b	Jupiter
Radius (R⊕)	1.00	3.89	11.21
Mass (M⊕)	1.00	14.40	317.83
Density (g/cm³)	5.51	1.34	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	14.400 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 4845

TIC

TIC 24250831

Gaia DR2

Gaia DR2 2473055951588089088

Gaia DR3

Gaia DR3 2473055951588089088

System

HIP 4845

Percentile among Sub-Neptune cohort

Radius 3.890 R⊕ · percentile 98 / cohort 1978

Mass 14.400 M⊕ · percentile 91 / cohort 1978

Orbital period 34.15 d · percentile 77 / cohort 1946

Distance 21.10 pc · percentile 5 / cohort 1975

ESI 0.553 · percentile 77 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

34.150 days

Semi-major axis

0.1760 AU

Eccentricity

0.250

Inclination

— °

Year Length

A year here lasts approximately 34.15 Earth days (9.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1760 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.553

0 = alien, 1 = Earth-identical

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

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 HIP 107772 b · Sub-Neptune GJ 480 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 4845

Spectral Class

K-type orange

Effective Temperature

4,010 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.604 R☉

Stellar Mass

0.620 M☉

Metallicity [Fe/H]

—

Distance

21.10 parsec

Light-years 68.81 ly

V-band magnitude

10.06 mag

Voyager-speed travel 1,213,472 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

47.370 mas

Total Proper Motion

178.723 mas/yr

PM Right Ascension

25.96 mas/yr

PM Declination

-176.83 mas/yr

Galactic Cartesian (pc)

x = 0.947 · y = 0.264 · z = -0.181

Equatorial (J2000)

RA 15.58817° · Dec -10.42462°

Galactic ℓ, b

132.200° · -73.100°

Ecliptic λ, β

10.199° · -15.732°

HTM-20 index

-445506630

Similar Worlds

TOI-942 b

Sub-Neptune · K-type orange

Radius 3.89 R⊕ · 497.7 ly

Kepler-1729 b

Sub-Neptune · K-type orange

Radius 3.89 R⊕ · 1,879.2 ly

Kepler-1024 b

Sub-Neptune · K-type orange

Radius 3.91 R⊕ · 3,546.6 ly

Kepler-1661 b

Sub-Neptune · K-type orange

Radius 3.87 R⊕ · 1,339.2 ly

Kepler-229 d

Sub-Neptune · K-type orange

Radius 3.85 R⊕ · 2,694.9 ly

Kepler-247 d

Sub-Neptune · K-type orange

Radius 3.94 R⊕ · 2,164.7 ly

Explore Related Categories

Sub-Neptune Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts