Key parameters at a glance

A radius of 6.20 Earth radii
A mass of 31.78 Earth masses
Surface gravity around 0.83 g
An orbital period of 4.947 days
Semi-major axis 0.0600 AU
Distance from Earth 140.38 light-years
Earth Similarity Index 0.417
Travel time at Voyager 1 speed 2,475,552 years

Context from the literature

HD 49674 b, formally named Eburonia, is an extrasolar planet located approximately 134 light-years away in the constellation of Auriga, orbiting the star HD 49674. It was discovered orbiting the star in 2002. The planet is a gas giant and orbits extremely close to its star, which takes only 4.95 days to revolve.

Excerpted from Wikipedia · full article

HD 49674 b Planet Profile

Physical Specs

Radius

6.20 R⊕

Radius (Jupiter)

0.553 R♃

Mass

31.78 M⊕

Mass (Jupiter)

0.100 M♃

Density

0.73 g/cm³

Surface Gravity

0.83 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.417

HZ Position Unknown

Controversial No

Discovery

Year 2002

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#262of 574

top 45.5%

This planet

6.20R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

KMT-2021-BLG-0320L b 6.20 R⊕ Kepler-453 b 6.20 R⊕ TIC 365102760 b 6.21 R⊕

Metric	Earth	HD 49674 b	Jupiter
Radius (R⊕)	1.00	6.20	11.21
Mass (M⊕)	1.00	31.78	317.83
Density (g/cm³)	5.51	0.73	1.33
Surface Gravity (g)	1.00	0.83	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	31.783 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 49674

HIP

HIP 32916

TIC

TIC 21267079

Gaia DR2

Gaia DR2 951427000863064192

Gaia DR3

Gaia DR3 951427000863064192

System

HD 49674

Percentile among Neptune-like cohort

Radius 6.200 R⊕ · percentile 54 / cohort 574

Mass 31.783 M⊕ · percentile 53 / cohort 574

Orbital period 4.95 d · percentile 20 / cohort 524

Distance 43.04 pc · percentile 13 / cohort 572

ESI 0.417 · percentile 76 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

4.947 days

Semi-major axis

0.0600 AU

Eccentricity

0.090

Inclination

— °

Year Length

A year here lasts approximately 4.95 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0600 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

12.000 m/s

Transit mid-time (BJD)

2,454,625.6140

Long. of periastron (ω)

17.00°

Angular separation (arcsec)

1.39000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.417

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Butler et al. 2003

Instrument

HIRES Spectrometer

Publication

2003-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2002 at W. M. Keck Observatory (7 shown).

14 Her b · Gas Giant HD 72659 b · Gas Giant HD 128311 b · Gas Giant HD 108874 b · Gas Giant HD 114729 b · Gas Giant HD 37124 b · Gas Giant HD 37124 c · Gas Giant

Host System: HD 49674

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,602 K — cooler than the Sun (5,778 K)

Estimated Age

3.62 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.020 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.32

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

1.232 g/cm³

Systemic radial velocity

11.97 km/s

Rotational v·sin i

0.42 km/s

Activity index (log R'HK)

-4.800

Metallicity ratio

[Fe/H]

Distance

43.04 parsec

Light-years 140.38 ly

V-band magnitude

8.10 mag

Voyager-speed travel 2,475,552 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.205 mas

Total Proper Motion

127.575 mas/yr

PM Right Ascension

34.59 mas/yr

PM Declination

-122.80 mas/yr

Galactic Cartesian (pc)

x = -0.169 · y = 0.737 · z = 0.654

Equatorial (J2000)

RA 102.87735° · Dec 40.86723°

Galactic ℓ, b

175.339° · 17.371°

Ecliptic λ, β

100.197° · 17.883°

HTM-20 index

-814607088

Observation Record

Photometric series

RV measurements

Stellar spectra

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