Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 810.47 Earth masses
Surface gravity around 4.65 g
An orbital period of 36.999 days
Semi-major axis 0.2380 AU
Distance from Earth 279.19 light-years
Earth Similarity Index 0.386
Travel time at Voyager 1 speed 4,923,559 years

HD 43691 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.180 R♃

Mass

810.47 M⊕

Mass (Jupiter)

2.550 M♃

Density

1.94 g/cm³

Surface Gravity

4.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.386

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HD 43691 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	810.47	317.83
Density (g/cm³)	5.51	1.94	1.33
Surface Gravity (g)	1.00	4.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	810.467 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 43691

HIP

HIP 30057

TIC

TIC 258444495

Gaia DR2

Gaia DR2 959971546241168384

Gaia DR3

Gaia DR3 959971546241608576

System

HD 43691

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 810.467 M⊕ · percentile 62 / cohort 1747

Orbital period 37.00 d · percentile 50 / cohort 1533

Distance 85.60 pc · percentile 32 / cohort 1759

ESI 0.386 · percentile 81 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

36.999 days

Semi-major axis

0.2380 AU

Eccentricity

0.080

Inclination

— °

Year Length

A year here lasts approximately 37.00 Earth days (10.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2380 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.386

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Da Silva et al. 2007

Instrument

ELODIE Spectrograph

Publication

2007-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at Haute-Provence Observatory (2 shown).

HD 132406 b · Gas Giant HD 196885 A b · Gas Giant

Host System: HD 43691

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,093 K — hotter than the Sun (5,778 K)

Estimated Age

2.39 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.600 R☉

Stellar Mass

1.320 M☉

Metallicity [Fe/H]

0.33

Extended Stellar Properties

Surface gravity (log g)

4.280 dex

Stellar density

0.309 g/cm³

Systemic radial velocity

-29.00 km/s

Rotational v·sin i

4.70 km/s

Metallicity ratio

[Fe/H]

Distance

85.60 parsec

Light-years 279.19 ly

V-band magnitude

8.03 mag

Voyager-speed travel 4,923,559 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.654 mas

Total Proper Motion

57.996 mas/yr

PM Right Ascension

22.73 mas/yr

PM Declination

-53.36 mas/yr

Galactic Cartesian (pc)

x = -0.064 · y = 0.751 · z = 0.657

Equatorial (J2000)

RA 94.89461° · Dec 41.09208°

Galactic ℓ, b

172.650° · 11.933°

Ecliptic λ, β

93.867° · 17.719°

HTM-20 index

-1319290972

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes