Key parameters at a glance

A radius of 12.60 Earth radii
A mass of 2,301.08 Earth masses
Surface gravity around 14.49 g
An orbital period of 1,002.700 days
Semi-major axis 1.9460 AU
Distance from Earth 112.31 light-years
Earth Similarity Index 0.427
Travel time at Voyager 1 speed 1,980,567 years

Context from the literature

HD 81040 b is a massive gas giant exoplanet that orbits the star HD 81040, discovered in 2005 by radial velocity. Its orbital period is just over 1000 days. It has a semimajor axis of about 1.95 AU, and its orbit is quite eccentric, at a little over 0.5.

Excerpted from Wikipedia · full article

HD 81040 b Planet Profile

Physical Specs

Radius

12.60 R⊕

Radius (Jupiter)

1.130 R♃

Mass

2,301.08 M⊕

Mass (Jupiter)

7.240 M♃

Density

6.32 g/cm³

Surface Gravity

14.49 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.427

HZ Position Unknown

Controversial No

Discovery

Year 2005

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

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 81040 b	Jupiter
Radius (R⊕)	1.00	12.60	11.21
Mass (M⊕)	1.00	2,301.08	317.83
Density (g/cm³)	5.51	6.32	1.33
Surface Gravity (g)	1.00	14.49	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2,301.078 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	2,183.481 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 81040

HIP

HIP 46076

TIC

TIC 414965996

Gaia DR2

Gaia DR2 637329067477530368

Gaia DR3

Gaia DR3 637329067477530368

System

HD 81040

Percentile among Gas Giant cohort

Radius 12.600 R⊕ · percentile 31 / cohort 1771

Mass 2,301.078 M⊕ · percentile 82 / cohort 1747

Orbital period 1,002.70 d · percentile 77 / cohort 1533

Distance 34.43 pc · percentile 10 / cohort 1759

ESI 0.427 · percentile 93 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,002.700 days

Semi-major axis

1.9460 AU

Eccentricity

0.525

Inclination

73.00 °

Year Length

A year here lasts about 2.75 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.9460 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.427

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

Sozzetti et al. 2006

Instrument

Multiple Instruments

Publication

2006-04

Observation locale

Ground

Host System: HD 81040

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,755 K — cooler than the Sun (5,778 K)

Estimated Age

1.79 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.910 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

1.883 g/cm³

Systemic radial velocity

49.25 km/s

Rotational v·sin i

2.00 km/s

Rotation period

15.98 days

Activity index (log R'HK)

-4.710

Metallicity ratio

[Fe/H]

Distance

34.43 parsec

Light-years 112.31 ly

V-band magnitude

7.72 mag

Voyager-speed travel 1,980,567 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

29.012 mas

Total Proper Motion

155.512 mas/yr

PM Right Ascension

-151.26 mas/yr

PM Declination

36.12 mas/yr

Galactic Cartesian (pc)

x = -0.728 · y = 0.591 · z = 0.348

Equatorial (J2000)

RA 140.94550° · Dec 20.36461°

Galactic ℓ, b

209.363° · 42.326°

Ecliptic λ, β

136.934° · 4.837°

HTM-20 index

605949009

Observation Record

Photometric series

RV measurements

Archive notes

Wikipedia → Image: Wikimedia Commons · ESA/Gaia/DPAC · CC BY-SA 3.0 igo