Key parameters at a glance
- A radius of 2.23 Earth radii
- A mass of 5.61 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 5.840 days
- Semi-major axis 0.0502 AU
- Equilibrium temperature 496 K (223 °C)
- Distance from Earth 605.36 light-years
- Earth Similarity Index 0.522
- Travel time at Voyager 1 speed 10,675,556 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-264
K2-264 b 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 |
|---|---|---|---|---|---|---|
| K2-264 b this | Sub-Neptune | 2.23 | 5.61 | 5.840 | 496 | 2018 |
| K2-264 c | Sub-Neptune | 2.67 | 7.60 | 19.660 | 331 | 2018 |
K2-264 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1621of 1978
top 81.9%
This planet
2.23R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-264 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.23 | 11.21 |
| Mass (M⊕) | 1.00 | 5.61 | 317.83 |
| Density (g/cm³) | 5.51 | 2.78 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 184914317
Gaia DR2
Gaia DR2 661167785238757376
Gaia DR3
Gaia DR3 661167785238757376
System
K2-264
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.84 Earth days (1.6% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0502 AU.
Transit Fingerprint
Duration
1.884 h
Impact parameter b
0.400
Rp / R★
0.043180
Transit midpoint (BJD)
2,458,102.5918
Extended Orbital Architecture
Planet / star radius ratio
0.043180
Semi-major axis / stellar radius
22.840
Impact parameter (b)
0.400
Transit mid-time (BJD)
2,458,102.5918
Angular separation (arcsec)
0.27100
Eq. Temperature
496K
(223 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.522
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
Rizzuto et al. 2018Instrument
Kepler CCD Array
Publication
2018-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-264
Spectral Class
M-type red dwarf
Effective Temperature
3,660 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.473 R☉
Stellar Mass
0.496 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.783 dex
Stellar density
6.610 g/cm³
Systemic radial velocity
26.00 km/s
Rotation period
22.20 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
5.360 mas
Total Proper Motion
40.093 mas/yr
PM Right Ascension
-37.90 mas/yr
PM Declination
-13.08 mas/yr
Galactic Cartesian (pc)
x = -0.622 · y = 0.707 · z = 0.337
Equatorial (J2000)
RA 131.35835° · Dec 19.69840°
Galactic ℓ, b
206.372° · 33.607°
Ecliptic λ, β
128.484° · 1.614°
HTM-20 index
1230300773
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