Key parameters at a glance

A radius of 9.60 Earth radii
A mass of 66.74 Earth masses
Surface gravity around 0.72 g
An orbital period of 3.971 days
Semi-major axis 0.0500 AU
Distance from Earth 198.57 light-years
Earth Similarity Index 0.314
Travel time at Voyager 1 speed 3,501,850 years

HD 76700 b Planet Profile

Physical Specs

Radius

9.60 R⊕

Radius (Jupiter)

0.856 R♃

Mass

66.74 M⊕

Mass (Jupiter)

0.210 M♃

Density

0.42 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.314

HZ Position Unknown

Controversial No

Discovery

Year 2002

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#33of 574

top 5.6%

This planet

9.60R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

KMT-2021-BLG-0240L b 9.60 R⊕ GJ 9066 c 9.60 R⊕ HD 107148 b 9.60 R⊕

Metric	Earth	HD 76700 b	Jupiter
Radius (R⊕)	1.00	9.60	11.21
Mass (M⊕)	1.00	66.74	317.83
Density (g/cm³)	5.51	0.42	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	66.744 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 76700

HIP

HIP 43686

TIC

TIC 302368715

Gaia DR2

Gaia DR2 5272187804562841216

Gaia DR3

Gaia DR3 5272187804562841216

System

HD 76700

Percentile among Neptune-like cohort

Radius 9.600 R⊕ · percentile 94 / cohort 574

Mass 66.744 M⊕ · percentile 83 / cohort 574

Orbital period 3.97 d · percentile 12 / cohort 524

Distance 60.88 pc · percentile 18 / cohort 572

ESI 0.314 · percentile 53 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

3.971 days

Semi-major axis

0.0500 AU

Eccentricity

0.090

Inclination

— °

Year Length

A year here lasts approximately 3.97 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.314

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Tinney et al. 2003

Instrument

UCLES Spectrograph

Publication

2003-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2002 at Anglo-Australian Telescope (5 shown).

HD 2039 b · Gas Giant HD 196050 b · Gas Giant HD 216437 b · Gas Giant HD 30177 b · Gas Giant HD 216435 b · Gas Giant

Host System: HD 76700

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,644 K — cooler than the Sun (5,778 K)

Estimated Age

11.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.370 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

0.31

Extended Stellar Properties

Surface gravity (log g)

4.160 dex

Stellar density

0.504 g/cm³

Systemic radial velocity

38.01 km/s

Rotational v·sin i

1.35 km/s

Metallicity ratio

[Fe/H]

Distance

60.88 parsec

Light-years 198.57 ly

V-band magnitude

8.16 mag

Voyager-speed travel 3,501,850 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

16.396 mas

Total Proper Motion

307.374 mas/yr

PM Right Ascension

-282.83 mas/yr

PM Declination

120.36 mas/yr

Galactic Cartesian (pc)

x = -0.271 · y = 0.286 · z = -0.919

Equatorial (J2000)

RA 133.47822° · Dec -66.80047°

Galactic ℓ, b

282.490° · -13.919°

Ecliptic λ, β

200.867° · -73.137°

HTM-20 index

-357353928

Observation Record

Photometric series

RV measurements

Archive notes