Key parameters at a glance

A radius of 2.93 Earth radii
A mass of 8.90 Earth masses
Surface gravity around 1.04 g
An orbital period of 8.125 days
Semi-major axis 0.0777 AU
Distance from Earth 82.88 light-years
Earth Similarity Index 0.647
Travel time at Voyager 1 speed 1,461,586 years

2 siblings around HD 96700

HD 96700 b 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 96700 b this	Sub-Neptune	2.93	8.90	8.125	—	2021
HD 96700 c	Super-Earth	1.69	3.50	19.880	—	2021
HD 96700 d	Sub-Neptune	3.61	12.70	103.500	—	2021

HD 96700 b Planet Profile

Physical Specs

Radius

2.93 R⊕

Radius (Jupiter)

0.261 R♃

Mass

8.90 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.94 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.647

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

#585of 1978

top 29.5%

This planet

2.93R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-125 d 2.93 R⊕ Kepler-221 c 2.93 R⊕ TOI-2015 c 2.93 R⊕

Metric	Earth	HD 96700 b	Jupiter
Radius (R⊕)	1.00	2.93	11.21
Mass (M⊕)	1.00	8.90	317.83
Density (g/cm³)	5.51	1.94	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)	8.900 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 96700

HIP

HIP 54400

TIC

TIC 23270430

Gaia DR2

Gaia DR2 5452492082132835840

Gaia DR3

Gaia DR3 5452492082132835840

System

HD 96700

Percentile among Sub-Neptune cohort

Radius 2.930 R⊕ · percentile 70 / cohort 1978

Mass 8.900 M⊕ · percentile 64 / cohort 1978

Orbital period 8.12 d · percentile 27 / cohort 1946

Distance 25.41 pc · percentile 6 / cohort 1975

ESI 0.647 · percentile 88 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.125 days

Semi-major axis

0.0777 AU

Eccentricity

0.138

Inclination

— °

Year Length

A year here lasts approximately 8.12 Earth days (2.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0777 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.647

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 93385 d · Sub-Neptune HD 13808 c · Sub-Neptune HD 13808 b · Sub-Neptune

Host System: HD 96700

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,845 K — hotter than the Sun (5,778 K)

Estimated Age

8.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.160 R☉

Stellar Mass

0.890 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.003 g/cm³

Systemic radial velocity

12.60 km/s

Rotational v·sin i

1.60 km/s

Activity index (log R'HK)

-4.950

Metallicity ratio

[Fe/H]

Distance

25.41 parsec

Light-years 82.88 ly

V-band magnitude

6.51 mag

Voyager-speed travel 1,461,586 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

39.324 mas

Total Proper Motion

522.506 mas/yr

PM Right Ascension

-505.44 mas/yr

PM Declination

-132.44 mas/yr

Galactic Cartesian (pc)

x = -0.842 · y = 0.195 · z = -0.503

Equatorial (J2000)

RA 166.97426° · Dec -30.17514°

Galactic ℓ, b

277.731° · 27.581°

Ecliptic λ, β

181.436° · -32.593°

HTM-20 index

-1905455141