Key parameters at a glance

A radius of 2.89 Earth radii
A mass of 8.70 Earth masses
Surface gravity around 1.04 g
An orbital period of 45.850 days
Semi-major axis 0.2565 AU
Distance from Earth 141.38 light-years
Earth Similarity Index 0.653
Travel time at Voyager 1 speed 2,493,244 years

2 siblings around HD 93385

HD 93385 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 93385 b	Super-Earth	1.88	4.20	7.343	—	2021
HD 93385 c	Sub-Neptune	2.56	7.10	13.180	—	2021
HD 93385 d this	Sub-Neptune	2.89	8.70	45.850	—	2021

HD 93385 d Planet Profile

Physical Specs

Radius

2.89 R⊕

Radius (Jupiter)

0.258 R♃

Mass

8.70 M⊕

Mass (Jupiter)

0.027 M♃

Density

1.98 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.653

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#640of 1978

top 32.3%

This planet

2.89R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-781 b 2.89 R⊕ Kepler-689 b 2.89 R⊕ Kepler-53 b 2.89 R⊕

Metric	Earth	HD 93385 d	Jupiter
Radius (R⊕)	1.00	2.89	11.21
Mass (M⊕)	1.00	8.70	317.83
Density (g/cm³)	5.51	1.98	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	8.700 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 93385

TIC

TIC 106900981

Gaia DR2

Gaia DR2 5391813299572883456

Gaia DR3

Gaia DR3 5391813299572883456

System

HD 93385

Percentile among Sub-Neptune cohort

Radius 2.890 R⊕ · percentile 67 / cohort 1978

Mass 8.700 M⊕ · percentile 61 / cohort 1978

Orbital period 45.85 d · percentile 84 / cohort 1946

Distance 43.35 pc · percentile 10 / cohort 1975

ESI 0.653 · percentile 88 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

45.850 days

Semi-major axis

0.2565 AU

Eccentricity

0.090

Inclination

— °

Year Length

A year here lasts approximately 45.85 Earth days (12.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2565 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.653

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Unger et al. 2021

Instrument

HARPS Spectrograph

Publication

2021-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at La Silla Observatory (12 shown).

HD 96700 c · Super-Earth HD 93385 b · Super-Earth HD 39194 b · Super-Earth HD 39194 d · Sub-Neptune HD 154088 b · Sub-Neptune HD 189567 c · Sub-Neptune HD 93385 c · Sub-Neptune HD 39194 c · Sub-Neptune HD 189567 b · Sub-Neptune HD 96700 b · Sub-Neptune HD 13808 c · Sub-Neptune HD 13808 b · Sub-Neptune

Host System: HD 93385

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,977 K — hotter than the Sun (5,778 K)

Estimated Age

3.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.185 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

0.932 g/cm³

Activity index (log R'HK)

-4.990

Metallicity ratio

[Fe/H]

Distance

43.35 parsec

Light-years 141.38 ly

V-band magnitude

7.49 mag

Voyager-speed travel 2,493,244 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.041 mas

Total Proper Motion

72.925 mas/yr

PM Right Ascension

-48.20 mas/yr

PM Declination

-54.73 mas/yr

Galactic Cartesian (pc)

x = -0.711 · y = 0.237 · z = -0.662

Equatorial (J2000)

RA 161.56271° · Dec -41.46460°

Galactic ℓ, b

279.100° · 15.542°

Ecliptic λ, β

183.694° · -44.571°

HTM-20 index

-1231164236