Key parameters at a glance
- A radius of 2.01 Earth radii
- A mass of 4.70 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 4.807 days
- Semi-major axis 0.0560 AU
- Equilibrium temperature 1,088 K (815 °C)
- Distance from Earth 2,545.19 light-years
- Earth Similarity Index 0.247
- Travel time at Voyager 1 speed 44,884,498 years
1 sibling around Kepler-280
Kepler-280 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-280 b | Super-Earth | 1.45 | 2.70 | 2.140 | 1,425 | 2014 |
| Kepler-280 c this | Sub-Neptune | 2.01 | 4.70 | 4.807 | 1,088 | 2014 |
Kepler-280 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1940of 1978
top 98.0%
This planet
2.01R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-280 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.01 | 11.21 |
| Mass (M⊕) | 1.00 | 4.70 | 317.83 |
| Density (g/cm³) | 5.51 | 3.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 279.09 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159716174
Gaia DR2
Gaia DR2 2101761079737564672
Gaia DR3
Gaia DR3 2101761079737564672
System
Kepler-280
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.81 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0560 AU.
Transit Fingerprint
Depth
0.045 %
Duration
0.901 h
Impact parameter b
0.680
Rp / R★
0.019700
Transit midpoint (BJD)
2,454,967.6425
Photometric dip
Transit produces a flux drop of 451 ppm lasting ≈ 0.90 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019700
Semi-major axis / stellar radius
13.500
Impact parameter (b)
0.680
Transit mid-time (BJD)
2,454,967.6425
Angular separation (arcsec)
0.07180
Eq. Temperature
1,088K
(815 °C)
Insolation (S⊕)
279.09
Earth = 1.00
Earth Similarity (ESI)
0.247
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-280
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,744 K — cooler than the Sun (5,778 K)
Estimated Age
5.62 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.886 R☉
Stellar Mass
0.962 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.537 dex
Stellar density
1.080 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.253 mas
Total Proper Motion
22.745 mas/yr
PM Right Ascension
3.49 mas/yr
PM Declination
-22.48 mas/yr
Galactic Cartesian (pc)
x = 0.270 · y = -0.690 · z = 0.671
Equatorial (J2000)
RA 291.39053° · Dec 42.18047°
Galactic ℓ, b
74.404° · 12.025°
Ecliptic λ, β
306.443° · 62.939°
HTM-20 index
-369621197
Similar Worlds
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Kepler-260 b
Sub-Neptune · G-type yellow (Sun-like)
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Kepler-903 b
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Kepler-1404 b
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Kepler-754 b
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HD 108236 f
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.02 R⊕ · 210.7 ly