Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,589.14 Earth masses
Surface gravity around 9.55 g
An orbital period of 310.900 days
Semi-major axis 0.7990 AU
Distance from Earth 115.60 light-years
Earth Similarity Index 0.429
Travel time at Voyager 1 speed 2,038,643 years

HIP 66074 b Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,589.14 M⊕

Mass (Jupiter)

5.000 M♃

Density

4.07 g/cm³

Surface Gravity

9.55 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.429

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Astrometry

Facility European Space Agency (ESA) Gaia Satellite

Telescope 1.45 m x 0.5 m Telescope

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HIP 66074 b	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,589.14	317.83
Density (g/cm³)	5.51	4.07	1.33
Surface Gravity (g)	1.00	9.55	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,589.142 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	251.084 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 66074

TIC

TIC 298130822

Gaia DR2

Gaia DR2 1712614124767394816

Gaia DR3

Gaia DR3 1712614124767394816

System

HIP 66074

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,589.142 M⊕ · percentile 75 / cohort 1747

Orbital period 310.90 d · percentile 61 / cohort 1533

Distance 35.44 pc · percentile 11 / cohort 1759

ESI 0.429 · percentile 94 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

310.900 days

Semi-major axis

0.7990 AU

Eccentricity

0.948

Inclination

13.00 °

Year Length

A year here lasts approximately 310.90 Earth days (85.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.7990 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.429

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Sozzetti et al. 2023

Instrument

Gaia CCD array

Publication

2023-09

Observation locale

Space

Host System: HIP 66074

Spectral Class

K-type orange

Effective Temperature

4,300 K — cooler than the Sun (5,778 K)

Estimated Age

7.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.690 R☉

Stellar Mass

0.705 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

3.020 g/cm³

Rotational v·sin i

1.80 km/s

Activity index (log R'HK)

-4.800

Metallicity ratio

[Fe/H]

Distance

35.44 parsec

Light-years 115.60 ly

V-band magnitude

10.25 mag

Voyager-speed travel 2,038,643 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

28.185 mas

Total Proper Motion

443.510 mas/yr

PM Right Ascension

-440.74 mas/yr

PM Declination

49.46 mas/yr

Galactic Cartesian (pc)

x = -0.238 · y = -0.102 · z = 0.966

Equatorial (J2000)

RA 203.16356° · Dec 75.00710°

Galactic ℓ, b

119.371° · 41.835°

Ecliptic λ, β

129.269° · 67.930°

HTM-20 index

1381631298

Similar Worlds

HD 112640 b

Gas Giant · K-type orange

Radius 12.90 R⊕ · 1,054.6 ly

HIP 70849 b

Gas Giant · K-type orange

Radius 12.90 R⊕ · 78.5 ly

HD 111591 b

Gas Giant · K-type orange

Radius 12.90 R⊕ · 372.4 ly

HD 102272 b

Gas Giant · K-type orange

Radius 12.90 R⊕ · 1,132.1 ly

GJ 86 b

Gas Giant · K-type orange

Radius 12.90 R⊕ · 35.2 ly

BD-210397 c

Gas Giant · K-type orange

Radius 12.90 R⊕ · 77.4 ly

Explore Related Categories

Gas Giant Planets Astrometry Discoveries European Space Agency (ESA) Gaia Satellite Mission K-type orange Hosts