Key parameters at a glance
- A radius of 3.32 Earth radii
- A mass of 11.00 Earth masses
- Surface gravity around 1.00 g
- An orbital period of 6.034 days
- Semi-major axis 0.0705 AU
- Equilibrium temperature 1,598 K (1325 °C)
- Distance from Earth 3,571.57 light-years
- Earth Similarity Index 0.131
- Travel time at Voyager 1 speed 62,984,656 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1270 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#268of 1978
top 13.5%
This planet
3.32R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1270 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.32 | 11.21 |
| Mass (M⊕) | 1.00 | 11.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.65 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.00 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,217.40 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 399826741
Gaia DR2
Gaia DR2 2131169545443676032
Gaia DR3
Gaia DR3 2131169545443676032
System
Kepler-1270
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.03 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0704 AU.
Transit Fingerprint
Depth
0.009 %
Duration
10.264 h
Impact parameter b
0.558
Rp / R★
0.009463
Transit midpoint (BJD)
2,454,970.1191
Photometric dip
Transit produces a flux drop of 90 ppm lasting ≈ 10.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.009463
Semi-major axis / stellar radius
4.387
Impact parameter (b)
0.558
Transit mid-time (BJD)
2,454,970.1191
Angular separation (arcsec)
0.06430
Eq. Temperature
1,598K
(1325 °C)
Insolation (S⊕)
1,217.40
Earth = 1.00
Earth Similarity (ESI)
0.131
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-1270
Spectral Class
K-type orange
Effective Temperature
5,047 K — cooler than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
3.380 R☉
Stellar Mass
1.280 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
3.490 dex
Stellar density
0.050 g/cm³
Systemic radial velocity
15.29 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.884 mas
Total Proper Motion
9.547 mas/yr
PM Right Ascension
0.20 mas/yr
PM Declination
-9.55 mas/yr
Galactic Cartesian (pc)
x = 0.190 · y = -0.633 · z = 0.751
Equatorial (J2000)
RA 286.71567° · Dec 48.64526°
Galactic ℓ, b
79.169° · 17.622°
Ecliptic λ, β
303.972° · 70.120°
HTM-20 index
-673327237
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