Confirmed Exoplanet Discovered 2006

LP 261-75 b

A gas giant orbiting the m-type red dwarf LP 261-75 A, located approximately 110.7 light-years from Earth.

Key parameters at a glance

  • A radius of 12.10 Earth radii
  • A mass of 6,674.40 Earth masses
  • Surface gravity around 45.59 g
  • Semi-major axis 450.0000 AU
  • Equilibrium temperature 1,500 K (1227 °C)
  • Distance from Earth 110.66 light-years
  • Earth Similarity Index 0.081
  • Travel time at Voyager 1 speed 1,951,457 years

LP 261-75 b Planet Profile

Physical Specs

Radius
12.10 R⊕
Radius (Jupiter)
1.080 R♃
Mass
6,674.40 M⊕
Mass (Jupiter)
21.000 M♃
Density
20.70 g/cm³
Surface Gravity
45.59 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.081
HZ Position Unknown
Controversial No

Discovery

Year 2006
Method Imaging
Facility Apache Point Observatory
Telescope ARC 3.5m Telescope

Size rank in cohort

Rank by radius

#1454of 1771

top 82.0%

This planet

12.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 62364 b 12.10 R⊕ HD 106515 A b 12.10 R⊕ BD+20 2457 b 12.10 R⊕
Metric Earth LP 261-75 b Jupiter
Radius (R⊕)1.0012.1011.21
Mass (M⊕)1.006,674.40317.83
Density (g/cm³)5.5120.701.33
Surface Gravity (g)1.0045.592.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 6,674.397 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 67646988

Gaia DR2

Gaia DR2 796443724462555904

Gaia DR3

Gaia DR3 796443724462555904

System

LP 261-75

Percentile among Gas Giant cohort

Radius 12.100 R⊕ · percentile 16 / cohort 1771
Mass 6,674.397 M⊕ · percentile 97 / cohort 1747
Distance 33.93 pc · percentile 9 / cohort 1759
ESI 0.081 · percentile 19 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
— days
Semi-major axis
450.0000 AU
Eccentricity
—
Inclination
— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

1,500K

(1227 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.081

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Reid & Walkowicz 2006

Instrument

Near-Infrared Camera & Fabry-Perot Spectrometer (NIC-FPS)

Publication

2006-05

Observation locale

Ground

Host System: LP 261-75 A

Spectral Class

M-type red dwarf

Effective Temperature

3,138 K — cooler than the Sun (5,778 K)

Estimated Age

0.15 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.308 R☉

Stellar Mass

0.220 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.919 dex

Stellar density

13.918 g/cm³

Rotational v·sin i

7.00 km/s

Rotation period

2.21 days

Distance
33.93 parsec
Light-years 110.66 ly
V-band magnitude
15.44 mag
Voyager-speed travel 1,951,457 yr

Multi-band Host Photometry — 16 bands

8.618.518.50U16.94B15.44V13.83Gaia12.44TESS16.20Sloan g14.73Sloan r13.54Sloan i12.15Sloan z10.58J9.96H9.69K9.53W19.37W29.18W38.57W4

Astrometric Data

Parallax

29.446 mas

Total Proper Motion

199.296 mas/yr

PM Right Ascension

-100.98 mas/yr

PM Declination

-171.82 mas/yr

Galactic Cartesian (pc)

x = -0.685 · y = 0.432 · z = 0.587

Equatorial (J2000)

RA 147.76853° · Dec 35.96856°

Galactic ℓ, b

188.352° · 50.927°

Ecliptic λ, β

137.390° · 21.541°

HTM-20 index

546255589

Similar Worlds

UCAC3 113-933 b

Gas Giant · M-type red dwarf

Radius 12.10 R⊕ · 171.5 ly

HD 18438 b

Gas Giant · M-type red dwarf

Radius 12.10 R⊕ · 731.1 ly

2MASS J11550485-7919108 b

Gas Giant · M-type red dwarf

Radius 12.10 R⊕ · 329.0 ly

HD 41004 B b

Gas Giant · M-type red dwarf

Radius 12.10 R⊕ · 135.5 ly

Gaia-5 b

Gas Giant · M-type red dwarf

Radius 12.10 R⊕ · 134.3 ly

ROXs 12 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 445.7 ly

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