Key parameters at a glance
- A radius of 4.15 Earth radii
- A mass of 5.90 Earth masses
- Surface gravity around 0.34 g
- An orbital period of 10.995 days
- Semi-major axis 0.0987 AU
- Equilibrium temperature 1,033 K (760 °C)
- Distance from Earth 835.00 light-years
- Earth Similarity Index 0.165
- Travel time at Voyager 1 speed 14,725,140 years
K2-79 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#531of 574
top 92.3%
This planet
4.15R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | K2-79 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.15 | 11.21 |
| Mass (M⊕) | 1.00 | 5.90 | 317.83 |
| Density (g/cm³) | 5.51 | 0.48 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.34 | 2.53 |
| Insolation (S⊕) | 1.00 | 180.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.900 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 435339558
Gaia DR2
Gaia DR2 38127013099258880
Gaia DR3
Gaia DR3 38127013099258880
System
K2-79
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.00 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0987 AU.
Transit Fingerprint
Depth
0.088 %
Duration
4.566 h
Impact parameter b
0.459
Rp / R★
0.030000
Transit midpoint (BJD)
2,459,917.9583
Photometric dip
Transit produces a flux drop of 880 ppm lasting ≈ 4.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030000
Semi-major axis / stellar radius
16.900
Impact parameter (b)
0.459
RV semi-amplitude (K)
1.620 m/s
Transit mid-time (BJD)
2,459,917.9583
Angular separation (arcsec)
0.38600
Eq. Temperature
1,033K
(760 °C)
Insolation (S⊕)
180.00
Earth = 1.00
Earth Similarity (ESI)
0.165
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Crossfield et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-79
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,897 K — hotter than the Sun (5,778 K)
Estimated Age
6.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.269 R☉
Stellar Mass
1.060 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.260 dex
Stellar density
0.733 g/cm³
Systemic radial velocity
-10.63 km/s
Rotational v·sin i
2.70 km/s
Activity index (log R'HK)
-5.129
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
3.878 mas
Total Proper Motion
42.001 mas/yr
PM Right Ascension
7.92 mas/yr
PM Declination
-41.25 mas/yr
Galactic Cartesian (pc)
x = 0.554 · y = 0.799 · z = 0.234
Equatorial (J2000)
RA 55.25593° · Dec 13.51919°
Galactic ℓ, b
173.690° · -32.171°
Ecliptic λ, β
56.141° · -5.930°
HTM-20 index
937704446
Similar Worlds
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Kepler-1799 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.13 R⊕ · 7,353.8 ly