Key parameters at a glance
- A radius of 10.40 Earth radii
- A mass of 4,386.05 Earth masses
- Surface gravity around 40.55 g
- An orbital period of 1.408 days
- Semi-major axis 0.0204 AU
- Equilibrium temperature 163 K (-110 °C)
- Distance from Earth 80.68 light-years
- Earth Similarity Index 0.258
- Travel time at Voyager 1 speed 1,422,750 years
- Almost certainly tidally locked to its host star given the close orbit
WD 1856+534 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1739of 1771
top 98.1%
This planet
10.40R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WD 1856+534 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.40 | 11.21 |
| Mass (M⊕) | 1.00 | 4,386.05 | 317.83 |
| Density (g/cm³) | 5.51 | 21.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 40.55 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.18 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4,386.054 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 267574918
Gaia DR2
Gaia DR2 2146576589564898688
Gaia DR3
Gaia DR3 2146576589564898688
System
WD 1856+534
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.41 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0204 AU.
Transit Fingerprint
Depth
56.650 %
Duration
0.133 h
Impact parameter b
7.160
Rp / R★
7.280000
Transit midpoint (BJD)
2,458,779.3751
Photometric dip
Transit produces a flux drop of 566,500 ppm lasting ≈ 0.13 h.
Extended Orbital Architecture
Planet / star radius ratio
7.280000
Semi-major axis / stellar radius
336.000
Impact parameter (b)
7.160
Transit mid-time (BJD)
2,458,779.3751
Angular separation (arcsec)
0.82500
Eq. Temperature
163K
(-110 °C)
Insolation (S⊕)
0.18
Earth = 1.00
Earth Similarity (ESI)
0.258
0 = alien, 1 = Earth-identical
Beyond the outer HZ boundary (too cold) — surface water would be frozen. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Vanderburg et al. 2020Instrument
TESS CCD Array
Publication
2020-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: WD 1856+534
Spectral Class
K-type orange
Effective Temperature
4,710 K — cooler than the Sun (5,778 K)
Estimated Age
7.93 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.013 R☉
Stellar Mass
0.518 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
40.398 mas
Total Proper Motion
246.420 mas/yr
PM Right Ascension
240.76 mas/yr
PM Declination
-52.51 mas/yr
Galactic Cartesian (pc)
x = 0.148 · y = -0.576 · z = 0.804
Equatorial (J2000)
RA 284.41568° · Dec 53.50902°
Galactic ℓ, b
83.499° · 20.623°
Ecliptic λ, β
305.355° · 75.177°
HTM-20 index
1640738890
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