Key parameters at a glance

A radius of 12.60 Earth radii
A mass of 2,542.63 Earth masses
Surface gravity around 16.02 g
Semi-major axis 2,500.0000 AU
Equilibrium temperature 340 K (67 °C)
Distance from Earth 62.77 light-years
Earth Similarity Index 0.457
Travel time at Voyager 1 speed 1,106,892 years

Context from the literature

WD 0806−661 B or b, formally named Ahra, is a planetary-mass companion of the white dwarf star WD 0806−661, or Maru.

Excerpted from Wikipedia · full article

WD 0806-661 b Planet Profile

Physical Specs

Radius

12.60 R⊕

Radius (Jupiter)

1.120 R♃

Mass

2,542.63 M⊕

Mass (Jupiter)

8.000 M♃

Density

6.98 g/cm³

Surface Gravity

16.02 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.457

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Imaging

Facility Spitzer Space Telescope

Telescope 0.85 m Spitzer Space Telescope

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	WD 0806-661 b	Jupiter
Radius (R⊕)	1.00	12.60	11.21
Mass (M⊕)	1.00	2,542.63	317.83
Density (g/cm³)	5.51	6.98	1.33
Surface Gravity (g)	1.00	16.02	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2,542.627 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 306826966

Gaia DR2

Gaia DR2 5274517467840296832

Gaia DR3

Gaia DR3 5274517467840296832

System

WD 0806-661

Percentile among Gas Giant cohort

Radius 12.600 R⊕ · percentile 31 / cohort 1771

Mass 2,542.627 M⊕ · percentile 83 / cohort 1747

Distance 19.24 pc · percentile 4 / cohort 1759

ESI 0.457 · percentile 99 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

2,500.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

340K

(67 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.457

0 = alien, 1 = Earth-identical

Insufficient insolation data — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Luhman et al. 2011

Instrument

IRAC Infrared Array Camera

Publication

2011-03

Observation locale

Space

Host System: WD 0806-661

Spectral Class

A-type white

Effective Temperature

9,552 K — hotter than the Sun (5,778 K)

Estimated Age

2.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

—

Stellar Mass

0.620 M☉

Metallicity [Fe/H]

—

Distance

19.24 parsec

Light-years 62.77 ly

V-band magnitude

13.86 mag

Voyager-speed travel 1,106,892 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

51.934 mas

Total Proper Motion

442.773 mas/yr

PM Right Ascension

335.55 mas/yr

PM Declination

-288.89 mas/yr

Galactic Cartesian (pc)

x = -0.211 · y = 0.342 · z = -0.916

Equatorial (J2000)

RA 121.72757° · Dec -66.30588°

Galactic ℓ, b

279.424° · -17.571°

Ecliptic λ, β

193.474° · -77.449°

HTM-20 index

1855619344

Wikipedia → Image: Wikimedia Commons · Meli thev · CC BY-SA 4.0

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