Key parameters at a glance

A radius of 12.60 Earth radii
A mass of 2,670.71 Earth masses
Surface gravity around 16.82 g
An orbital period of 2,514.534 days
Semi-major axis 3.6040 AU
Distance from Earth 181.30 light-years
Earth Similarity Index 0.408
Travel time at Voyager 1 speed 3,197,214 years

1 sibling around HD 30177

HD 30177 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 30177 b this	Gas Giant	12.60	2,670.71	2,514.534	—	2002
HD 30177 c	Gas Giant	12.70	1,954.64	12,085.452	—	2016

HD 30177 b Planet Profile

Physical Specs

Radius

12.60 R⊕

Radius (Jupiter)

1.120 R♃

Mass

2,670.71 M⊕

Mass (Jupiter)

8.403 M♃

Density

7.34 g/cm³

Surface Gravity

16.82 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.408

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

#1179of 1771

top 66.5%

This planet

12.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-419 c 12.60 R⊕ 2MASS J04414489+2301513 b 12.60 R⊕ HD 47536 b 12.60 R⊕

Metric	Earth	HD 30177 b	Jupiter
Radius (R⊕)	1.00	12.60	11.21
Mass (M⊕)	1.00	2,670.71	317.83
Density (g/cm³)	5.51	7.34	1.33
Surface Gravity (g)	1.00	16.82	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2,670.712 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	2,568.066 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 30177

HIP

HIP 21850

TIC

TIC 220408612

Gaia DR2

Gaia DR2 4774301387290235136

Gaia DR3

Gaia DR3 4774301387290235136

System

HD 30177

Percentile among Gas Giant cohort

Radius 12.600 R⊕ · percentile 31 / cohort 1771

Mass 2,670.712 M⊕ · percentile 85 / cohort 1747

Orbital period 2,514.53 d · percentile 87 / cohort 1533

Distance 55.59 pc · percentile 23 / cohort 1759

ESI 0.408 · percentile 88 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,514.534 days

Semi-major axis

3.6040 AU

Eccentricity

0.207

Inclination

85.39 °

Year Length

A year here lasts about 6.88 Earth years on a mildly elliptical path at a mean orbital distance of 3.6040 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.408

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 216435 b · Gas Giant HD 76700 b · Neptune-like

Host System: HD 30177

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,580 K — cooler than the Sun (5,778 K)

Estimated Age

2.52 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.019 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.37

Extended Stellar Properties

Surface gravity (log g)

4.417 dex

Stellar density

0.815 g/cm³

Systemic radial velocity

62.80 km/s

Rotational v·sin i

2.96 km/s

Rotation period

45.00 days

Metallicity ratio

[M/H]

Distance

55.59 parsec

Light-years 181.30 ly

V-band magnitude

8.41 mag

Voyager-speed travel 3,197,214 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.961 mas

Total Proper Motion

67.282 mas/yr

PM Right Ascension

66.21 mas/yr

PM Declination

-11.99 mas/yr

Galactic Cartesian (pc)

x = 0.177 · y = 0.499 · z = -0.848

Equatorial (J2000)

RA 70.47710° · Dec -58.02081°

Galactic ℓ, b

267.370° · -39.734°

Ecliptic λ, β

34.259° · -77.634°

HTM-20 index

2041062208

Observation Record

Photometric series

RV measurements

Archive notes