Key parameters at a glance
- A radius of 2.24 Earth radii
- A mass of 5.65 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 12.699 days
- Semi-major axis 0.1040 AU
- Equilibrium temperature 686 K (413 °C)
- Distance from Earth 3,365.77 light-years
- Earth Similarity Index 0.385
- Travel time at Voyager 1 speed 59,355,295 years
1 sibling around Kepler-284
Kepler-284 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 |
|---|---|---|---|---|---|---|
| Kepler-284 b this | Sub-Neptune | 2.24 | 5.65 | 12.699 | 686 | 2014 |
| Kepler-284 c | Sub-Neptune | 2.61 | 7.32 | 37.514 | 478 | 2014 |
Kepler-284 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1607of 1978
top 81.2%
This planet
2.24R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-284 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.24 | 11.21 |
| Mass (M⊕) | 1.00 | 5.65 | 317.83 |
| Density (g/cm³) | 5.51 | 2.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 38.37 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 275486985
Gaia DR2
Gaia DR2 2128818411627270528
Gaia DR3
Gaia DR3 2128818411627270528
System
Kepler-284
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 12.70 Earth days (3.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1040 AU.
Transit Fingerprint
Depth
0.080 %
Duration
2.819 h
Impact parameter b
0.240
Rp / R★
0.027024
Transit midpoint (BJD)
2,455,017.9852
Photometric dip
Transit produces a flux drop of 797 ppm lasting ≈ 2.82 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027024
Semi-major axis / stellar radius
26.800
Impact parameter (b)
0.240
Transit mid-time (BJD)
2,455,017.9852
Angular separation (arcsec)
0.10100
Eq. Temperature
686K
(413 °C)
Insolation (S⊕)
38.37
Earth = 1.00
Earth Similarity (ESI)
0.385
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-284
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,615 K — cooler than the Sun (5,778 K)
Estimated Age
0.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.814 R☉
Stellar Mass
0.766 M☉
Metallicity [Fe/H]
-0.26
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
1.840 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.941 mas
Total Proper Motion
17.430 mas/yr
PM Right Ascension
12.51 mas/yr
PM Declination
12.14 mas/yr
Galactic Cartesian (pc)
x = 0.264 · y = -0.618 · z = 0.740
Equatorial (J2000)
RA 293.14657° · Dec 47.72971°
Galactic ℓ, b
80.078° · 13.327°
Ecliptic λ, β
314.069° · 67.659°
HTM-20 index
-611251484
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Kepler-556 b
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Kepler-534 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.24 R⊕ · 1,861.2 ly