Confirmed Exoplanet Discovered 2001

HD 39091 b

A gas giant orbiting the g-type yellow (sun-like) HD 39091, located approximately 59.6 light-years from Earth.

Key parameters at a glance

  • A radius of 12.30 Earth radii
  • A mass of 4,481.38 Earth masses
  • Surface gravity around 29.62 g
  • An orbital period of 2,088.800 days
  • Semi-major axis 3.2800 AU
  • Distance from Earth 59.59 light-years
  • Earth Similarity Index 0.337
  • Travel time at Voyager 1 speed 1,050,858 years

2 siblings around HD 39091

HD 39091 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet Type Radius (R⊕) Mass (M⊕) Period (d) Eq. T (K) Year
pi Men c Sub-Neptune 2.02 3.63 6.268 1,170 2018
pi Men d Sub-Neptune 3.72 13.38 124.640 — 2022
HD 39091 b this Gas Giant 12.30 4,481.38 2,088.800 — 2001

HD 39091 b Planet Profile

Physical Specs

Radius
12.30 R⊕
Radius (Jupiter)
1.100 R♃
Mass
4,481.38 M⊕
Mass (Jupiter)
14.100 M♃
Density
13.20 g/cm³
Surface Gravity
29.62 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.337
HZ Position Unknown
Controversial No

Discovery

Year 2001
Method Radial Velocity
Facility Anglo-Australian Telescope
Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#1349of 1771

top 76.1%

This planet

12.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-13 c 12.30 R⊕ HD 22781 b 12.30 R⊕ CHXR 73 b 12.30 R⊕
Metric Earth HD 39091 b Jupiter
Radius (R⊕)1.0012.3011.21
Mass (M⊕)1.004,481.38317.83
Density (g/cm³)5.5113.201.33
Surface Gravity (g)1.0029.622.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 4,481.381 M⊕ Direct mass measurement (not derived).
Minimum mass (M sin i) 3,143.323 M⊕ Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD

HD 39091

HIP

HIP 26394

TIC

TIC 261136679

Gaia DR2

Gaia DR2 4623036865373793408

Gaia DR3

Gaia DR3 4623036865373793408

System

HD 39091

Percentile among Gas Giant cohort

Radius 12.300 R⊕ · percentile 22 / cohort 1771
Mass 4,481.381 M⊕ · percentile 93 / cohort 1747
Orbital period 2,088.80 d · percentile 85 / cohort 1533
Distance 18.27 pc · percentile 3 / cohort 1759
ESI 0.337 · percentile 67 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
2,088.800 days
Semi-major axis
3.2800 AU
Eccentricity
0.642
Inclination
45.80 °

Year Length

A year here lasts about 5.72 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.2800 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

196.100 m/s

Transit mid-time (BJD)

2,458,632.6000

Long. of periastron (ω)

-30.10°

Angular separation (arcsec)

180.00000

Eq. Temperature

—

 

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.337

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Jones et al. 2002

Instrument

UCLES Spectrograph

Publication

2002-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2001 at Anglo-Australian Telescope (2 shown).

HD 142 b · Gas Giant HD 23079 b · Gas Giant

Host System: HD 39091

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,998 K — hotter than the Sun (5,778 K)

Estimated Age

3.92 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.170 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.430 dex

Stellar density

0.945 g/cm³

Systemic radial velocity

10.71 km/s

Rotational v·sin i

3.34 km/s

Rotation period

18.30 days

Activity index (log R'HK)

-4.970

Metallicity ratio

[Fe/H]

Distance
18.27 parsec
Light-years 59.59 ly
V-band magnitude
5.65 mag
Voyager-speed travel 1,050,858 yr

Multi-band Host Photometry — 11 bands

4.06.36.25B5.65V5.51Gaia5.11TESS4.87J4.42H4.24K4.27W13.97W24.20W34.22W4

Astrometric Data

Parallax

54.705 mas

Total Proper Motion

1,094.030 mas/yr

PM Right Ascension

311.19 mas/yr

PM Declination

1,048.84 mas/yr

Galactic Cartesian (pc)

x = 0.016 · y = 0.165 · z = -0.986

Equatorial (J2000)

RA 84.29928° · Dec -80.46460°

Galactic ℓ, b

292.508° · -29.776°

Ecliptic λ, β

273.901° · -76.019°

HTM-20 index

1068394155

Observation Record

Photometric series

1

RV measurements

2

Stellar spectra

1

Archive notes

2

Similar Worlds

Kepler-30 c

Gas Giant · G-type yellow (Sun-like)

Radius 12.30 R⊕ · 2,981.8 ly

HAT-P-13 c

Gas Giant · G-type yellow (Sun-like)

Radius 12.30 R⊕ · 805.0 ly

GJ 2030 c

Gas Giant · G-type yellow (Sun-like)

Radius 12.30 R⊕ · 120.9 ly

HATS-59 c

Gas Giant · G-type yellow (Sun-like)

Radius 12.30 R⊕ · 2,096.8 ly

HD 11506 d

Gas Giant · G-type yellow (Sun-like)

Radius 12.30 R⊕ · 167.2 ly

HD 175167 b

Gas Giant · G-type yellow (Sun-like)

Radius 12.30 R⊕ · 231.9 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Anglo-Australian Telescope Mission G-type yellow (Sun-like) Hosts