Key parameters at a glance
- A radius of 2.58 Earth radii
- A mass of 22.25 Earth masses
- Surface gravity around 3.35 g
- An orbital period of 41.686 days
- Semi-major axis 0.2410 AU
- Equilibrium temperature 546 K (273 °C)
- Distance from Earth 585.32 light-years
- Earth Similarity Index 0.463
- Travel time at Voyager 1 speed 10,322,167 years
Context from the literature
BD+ 20° 594b is a massive exoplanet discovered by the Kepler spacecraft in collaboration with the HARPS spectrometer at La Silla in Chile.
Excerpted from Wikipedia · full article
BD+20 594 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1069of 1978
top 54.0%
This planet
2.58R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | BD+20 594 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.58 | 11.21 |
| Mass (M⊕) | 1.00 | 22.25 | 317.83 |
| Density (g/cm³) | 5.51 | 7.89 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.35 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 22.248 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 26123781
Gaia DR2
Gaia DR2 58200934326315136
Gaia DR3
Gaia DR3 58200934326315136
System
BD+20 594
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 41.69 Earth days (11.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2410 AU.
Transit Fingerprint
Depth
0.049 %
Rp / R★
0.022040
Transit midpoint (BJD)
2,457,068.5288
Photometric dip
Transit produces a flux drop of 490 ppm.
Extended Orbital Architecture
Planet / star radius ratio
0.022040
Semi-major axis / stellar radius
55.800
RV semi-amplitude (K)
3.100 m/s
Transit mid-time (BJD)
2,457,068.5288
Angular separation (arcsec)
1.34000
Eq. Temperature
546K
(273 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.463
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Espinoza et al. 2016Instrument
Kepler CCD Array
Publication
2016-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: BD+20 594
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,766 K — cooler than the Sun (5,778 K)
Estimated Age
3.34 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.080 R☉
Stellar Mass
1.670 M☉
Metallicity [Fe/H]
-0.15
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
1.890 g/cm³
Systemic radial velocity
-20.34 km/s
Rotational v·sin i
3.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
5.544 mas
Total Proper Motion
63.054 mas/yr
PM Right Ascension
36.57 mas/yr
PM Declination
-51.36 mas/yr
Galactic Cartesian (pc)
x = 0.555 · y = 0.754 · z = 0.352
Equatorial (J2000)
RA 53.65112° · Dec 20.59902°
Galactic ℓ, b
166.797° · -28.053°
Ecliptic λ, β
56.289° · 1.312°
HTM-20 index
-222871542
Similar Worlds
Kepler-1685 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.58 R⊕ · 3,724.3 ly
K2-219 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.58 R⊕ · 1,061.3 ly
Kepler-461 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.58 R⊕ · 2,257.5 ly
Kepler-1018 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.58 R⊕ · 3,294.2 ly
K2-73 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.58 R⊕ · 878.0 ly
Kepler-500 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.58 R⊕ · 2,633.6 ly