Key parameters at a glance
- A radius of 2.24 Earth radii
- A mass of 5.65 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 178.140 days
- Semi-major axis 0.5630 AU
- Equilibrium temperature 291 K (18 °C)
- Distance from Earth 2,469.16 light-years
- Earth Similarity Index 0.795
- Travel time at Voyager 1 speed 43,543,590 years
Context from the literature
The list of exoplanets detected by the Kepler space telescope contains bodies with a wide variety of properties, with significant ranges in orbital distances, masses, radii, composition, habitability, and host star type. As of June 16 2023, the Kepler space telescope and its follow-up observations have detected 2,778 planets, including hot Jupiters, super-Earths, circumbinary planets, and planets located in the circumstellar habitable zones of their host stars. Kepler has detected over 3,601 unconfirmed planet candidates and 2,165 eclipsing binary stars.
Excerpted from Wikipedia · full article
Kepler-439 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1607of 1978
top 81.2%
This planet
2.24R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-439 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.24 | 11.21 |
| Mass (M⊕) | 1.00 | 5.65 | 317.83 |
| Density (g/cm³) | 5.51 | 2.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.83 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123202589
Gaia DR2
Gaia DR2 2117331813650826624
Gaia DR3
Gaia DR3 2117331813650826624
System
Kepler-439
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 178.14 Earth days (48.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5630 AU.
Transit Fingerprint
Depth
0.068 %
Duration
9.590 h
Impact parameter b
0.100
Rp / R★
0.023920
Transit midpoint (BJD)
2,455,399.3987
Photometric dip
Transit produces a flux drop of 679 ppm lasting ≈ 9.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023920
Semi-major axis / stellar radius
142.000
Impact parameter (b)
0.100
Transit mid-time (BJD)
2,455,399.3987
Angular separation (arcsec)
0.74400
Eq. Temperature
291K
(18 °C)
Insolation (S⊕)
1.83
Earth = 1.00
Earth Similarity (ESI)
0.795
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Discovery Paper
Primary reference
Torres et al. 2015Instrument
Kepler CCD Array
Publication
2015-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2015 at Kepler (12 shown).
Host System: Kepler-439
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,431 K — cooler than the Sun (5,778 K)
Estimated Age
7.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.866 R☉
Stellar Mass
0.884 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.514 dex
Stellar density
1.890 g/cm³
Systemic radial velocity
-39.88 km/s
Rotational v·sin i
1.90 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.292 mas
Total Proper Motion
6.497 mas/yr
PM Right Ascension
-6.13 mas/yr
PM Declination
2.16 mas/yr
Galactic Cartesian (pc)
x = 0.135 · y = -0.706 · z = 0.695
Equatorial (J2000)
RA 280.80152° · Dec 44.03397°
Galactic ℓ, b
73.118° · 19.872°
Ecliptic λ, β
289.934° · 66.727°
HTM-20 index
-96130437
Similar Worlds
Kepler-157 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 2,523.5 ly
HD 134606 f
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 87.4 ly
Kepler-284 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 3,365.8 ly
Kepler-69 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 2,383.0 ly
Kepler-556 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 2,200.2 ly
Kepler-534 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 1,861.2 ly