Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 508.53 Earth masses
Surface gravity around 2.79 g
An orbital period of 857.500 days
Semi-major axis 1.6700 AU
Distance from Earth 120.02 light-years
Earth Similarity Index 0.348
Travel time at Voyager 1 speed 2,116,556 years

HD 42012 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

508.53 M⊕

Mass (Jupiter)

1.600 M♃

Density

1.14 g/cm³

Surface Gravity

2.79 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.348

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 42012 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	508.53	317.83
Density (g/cm³)	5.51	1.14	1.33
Surface Gravity (g)	1.00	2.79	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	508.528 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 42012

HIP

HIP 29242

TIC

TIC 97724459

Gaia DR2

Gaia DR2 3452333199728743936

Gaia DR3

Gaia DR3 3452333199728743936

System

HD 42012

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 508.528 M⊕ · percentile 49 / cohort 1747

Orbital period 857.50 d · percentile 75 / cohort 1533

Distance 36.80 pc · percentile 11 / cohort 1759

ESI 0.348 · percentile 70 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

857.500 days

Semi-major axis

1.6700 AU

Eccentricity

0.200

Inclination

— °

Year Length

A year here lasts about 2.35 Earth years on a mildly elliptical path at a mean orbital distance of 1.6700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.348

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Rey et al. 2017

Instrument

Multiple Instruments

Publication

2017-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at Haute-Provence Observatory (2 shown).

HD 29021 b · Gas Giant HD 17674 b · Gas Giant

Host System: HD 42012

Spectral Class

K-type orange

Effective Temperature

5,405 K — cooler than the Sun (5,778 K)

Estimated Age

4.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.830 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

2.201 g/cm³

Systemic radial velocity

41.07 km/s

Rotational v·sin i

2.20 km/s

Metallicity ratio

[Fe/H]

Distance

36.80 parsec

Light-years 120.02 ly

V-band magnitude

8.44 mag

Voyager-speed travel 2,116,556 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

27.146 mas

Total Proper Motion

263.853 mas/yr

PM Right Ascension

36.43 mas/yr

PM Declination

-261.33 mas/yr

Galactic Cartesian (pc)

x = -0.036 · y = 0.827 · z = 0.561

Equatorial (J2000)

RA 92.48547° · Dec 34.13417°

Galactic ℓ, b

178.061° · 7.078°

Ecliptic λ, β

92.090° · 10.713°

HTM-20 index

429005582

Similar Worlds

Kepler-46 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,534.4 ly

HD 222076 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 297.3 ly

HD 128311 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 53.3 ly

BD+48 740 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,174.1 ly

HD 81688 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 279.6 ly

HD 47366 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 275.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Haute-Provence Observatory Mission K-type orange Hosts