Key parameters at a glance

A radius of 14.46 Earth radii
A mass of 3,496.11 Earth masses
Surface gravity around 16.72 g
Semi-major axis 487.1000 AU
Equilibrium temperature 1,040 K (767 °C)
Distance from Earth 128.02 light-years
Earth Similarity Index 0.158
Travel time at Voyager 1 speed 2,257,583 years

HD 203030 b Planet Profile

Physical Specs

Radius

14.46 R⊕

Radius (Jupiter)

1.290 R♃

Mass

3,496.11 M⊕

Mass (Jupiter)

11.000 M♃

Density

6.35 g/cm³

Surface Gravity

16.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.158

HZ Position Unknown

Controversial No

Discovery

Year 2006

Method Imaging

Facility Palomar Observatory

Telescope 5.1 m Hale Telescope

Size rank in cohort

Rank by radius

#283of 1771

top 15.9%

This planet

14.46R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-3980 b 14.46 R⊕ TOI-2583 A b 14.46 R⊕ WASP-72 b 14.46 R⊕

Metric	Earth	HD 203030 b	Jupiter
Radius (R⊕)	1.00	14.46	11.21
Mass (M⊕)	1.00	3,496.11	317.83
Density (g/cm³)	5.51	6.35	1.33
Surface Gravity (g)	1.00	16.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,496.112 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 203030

HIP

HIP 105232

TIC

TIC 25559430

Gaia DR2

Gaia DR2 1846882224145757056

Gaia DR3

Gaia DR3 1846882224145757056

System

HD 203030

Percentile among Gas Giant cohort

Radius 14.460 R⊕ · percentile 84 / cohort 1771

Mass 3,496.112 M⊕ · percentile 89 / cohort 1747

Distance 39.25 pc · percentile 13 / cohort 1759

ESI 0.158 · percentile 37 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

487.1000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

1,040K

(767 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.158

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Metchev Hillenbrand 2006

Instrument

PHARO Camera

Publication

2006-11

Observation locale

Ground

Host System: HD 203030

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,603 K — cooler than the Sun (5,778 K)

Estimated Age

0.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.856 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

0.30

Extended Stellar Properties

Surface gravity (log g)

4.640 dex

Stellar density

1.975 g/cm³

Systemic radial velocity

-17.00 km/s

Rotational v·sin i

5.62 km/s

Activity index (log R'HK)

-4.370

Metallicity ratio

[Fe/H]

Distance

39.25 parsec

Light-years 128.02 ly

V-band magnitude

8.45 mag

Voyager-speed travel 2,257,583 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

25.449 mas

Total Proper Motion

133.935 mas/yr

PM Right Ascension

133.59 mas/yr

PM Declination

9.56 mas/yr

Galactic Cartesian (pc)

x = 0.685 · y = -0.580 · z = 0.442

Equatorial (J2000)

RA 319.74322° · Dec 26.23058°

Galactic ℓ, b

74.614° · -16.118°

Ecliptic λ, β

332.518° · 39.501°

HTM-20 index

-281319113

Observation Record

Photometric series

Stellar spectra

Archive notes