Key parameters at a glance

A radius of 3.46 Earth radii
A mass of 11.80 Earth masses
Surface gravity around 0.99 g
An orbital period of 2.046 days
Semi-major axis 0.0340 AU
Distance from Earth 179.06 light-years
Earth Similarity Index 0.592
Travel time at Voyager 1 speed 3,157,740 years

HD 24085 b Planet Profile

Physical Specs

Radius

3.46 R⊕

Radius (Jupiter)

0.309 R♃

Mass

11.80 M⊕

Mass (Jupiter)

0.037 M♃

Density

1.57 g/cm³

Surface Gravity

0.99 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.592

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Las Campanas Observatory

Telescope 6.5 m Magellan II Clay Telescope

Size rank in cohort

Rank by radius

#193of 1978

top 9.7%

This planet

3.46R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 69830 c 3.46 R⊕ Kepler-1533 b 3.46 R⊕ TOI-1853 b 3.46 R⊕

Metric	Earth	HD 24085 b	Jupiter
Radius (R⊕)	1.00	3.46	11.21
Mass (M⊕)	1.00	11.80	317.83
Density (g/cm³)	5.51	1.57	1.33
Surface Gravity (g)	1.00	0.99	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	11.800 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 24085

HIP

HIP 17515

TIC

TIC 32001057

Gaia DR2

Gaia DR2 4666907516760096512

Gaia DR3

Gaia DR3 4666907516760096512

System

HD 24085

Percentile among Sub-Neptune cohort

Radius 3.460 R⊕ · percentile 90 / cohort 1978

Mass 11.800 M⊕ · percentile 83 / cohort 1978

Orbital period 2.05 d · percentile 2 / cohort 1946

Distance 54.90 pc · percentile 12 / cohort 1975

ESI 0.592 · percentile 81 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

2.046 days

Semi-major axis

0.0340 AU

Eccentricity

0.220

Inclination

— °

Year Length

A year here lasts approximately 2.05 Earth days (0.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0340 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.592

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2019

Instrument

Carnegie Planet Finder Spectrograph

Publication

2019-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Las Campanas Observatory (12 shown).

HD 39855 b · Sub-Neptune HIP 54373 b · Sub-Neptune HD 103949 b · Sub-Neptune HIP 54373 c · Sub-Neptune HIP 35173 b · Sub-Neptune HD 211970 b · Sub-Neptune HD 64114 b · Neptune-like HIP 71135 b · Neptune-like HD 206255 b · Neptune-like HD 21411 b · Neptune-like HD 8326 b · Neptune-like HD 102843 b · Gas Giant

Host System: HD 24085

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,034 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.413 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.197 dex

Stellar density

0.576 g/cm³

Systemic radial velocity

27.94 km/s

Rotational v·sin i

6.00 km/s

Metallicity ratio

[M/H]

Distance

54.90 parsec

Light-years 179.06 ly

V-band magnitude

7.57 mag

Voyager-speed travel 3,157,740 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.186 mas

Total Proper Motion

97.796 mas/yr

PM Right Ascension

-9.25 mas/yr

PM Declination

-97.36 mas/yr

Galactic Cartesian (pc)

x = 0.190 · y = 0.284 · z = -0.940

Equatorial (J2000)

RA 56.25634° · Dec -70.02452°

Galactic ℓ, b

284.953° · -40.501°

Ecliptic λ, β

329.174° · -77.234°

HTM-20 index

-1081365471