Key parameters at a glance
- A radius of 3.77 Earth radii
- A mass of 13.70 Earth masses
- Surface gravity around 0.96 g
- An orbital period of 18.718 days
- Semi-major axis 0.1291 AU
- Equilibrium temperature 583 K (310 °C)
- Distance from Earth 1,592.14 light-years
- Earth Similarity Index 0.365
- Travel time at Voyager 1 speed 28,077,335 years
- Almost certainly tidally locked to its host star given the close orbit
K2-276 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#63of 1978
top 3.1%
This planet
3.77R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-276 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.77 | 11.21 |
| Mass (M⊕) | 1.00 | 13.70 | 317.83 |
| Density (g/cm³) | 5.51 | 1.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.96 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 14570090
Gaia DR2
Gaia DR2 677884313351354880
Gaia DR3
Gaia DR3 677884313351354880
System
K2-276
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 18.72 Earth days (5.1% of a terrestrial year) at a mean orbital distance of 0.1291 AU.
Transit Fingerprint
Depth
0.182 %
Duration
6.888 h
Impact parameter b
0.380
Rp / R★
0.040500
Transit midpoint (BJD)
2,457,151.8765
Photometric dip
Transit produces a flux drop of 1,816 ppm lasting ≈ 6.89 h.
Extended Orbital Architecture
Planet / star radius ratio
0.040500
Semi-major axis / stellar radius
21.070
Impact parameter (b)
0.380
Transit mid-time (BJD)
2,457,151.8765
Angular separation (arcsec)
0.26400
Eq. Temperature
583K
(310 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.365
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Livingston et al. 2018Instrument
Kepler CCD Array
Publication
2018-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-276
Spectral Class
K-type orange
Effective Temperature
5,139 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.850 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.490 dex
Stellar density
0.505 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.020 mas
Total Proper Motion
23.363 mas/yr
PM Right Ascension
14.61 mas/yr
PM Declination
-18.23 mas/yr
Galactic Cartesian (pc)
x = -0.542 · y = 0.747 · z = 0.385
Equatorial (J2000)
RA 125.95283° · Dec 22.63394°
Galactic ℓ, b
201.128° · 29.846°
Ecliptic λ, β
122.867° · 3.204°
HTM-20 index
2125923023
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