Key parameters at a glance
- A radius of 4.30 Earth radii
- A mass of 17.10 Earth masses
- Surface gravity around 0.92 g
- An orbital period of 4.288 days
- Semi-major axis 0.0504 AU
- Equilibrium temperature 1,022 K (749 °C)
- Distance from Earth 824.09 light-years
- Earth Similarity Index 0.195
- Travel time at Voyager 1 speed 14,532,801 years
1 sibling around KOI-984
KOI-984 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 |
|---|---|---|---|---|---|---|
| KOI-984 b this | Neptune-like | 4.30 | 17.10 | 4.288 | 1,022 | 2022 |
| KOI-984 c | Gas Giant | 14.10 | 209.80 | 21.512 | 597 | 2022 |
KOI-984 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#494of 574
top 85.9%
This planet
4.30R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | KOI-984 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.30 | 11.21 |
| Mass (M⊕) | 1.00 | 17.10 | 317.83 |
| Density (g/cm³) | 5.51 | 1.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.92 | 2.53 |
| Insolation (S⊕) | 1.00 | 186.31 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122784501
System
KOI-984
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.29 Earth days (1.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0504 AU.
Transit Fingerprint
Depth
0.229 %
Duration
1.580 h
Impact parameter b
0.830
Rp / R★
0.029232
Transit midpoint (BJD)
2,454,957.7837
Photometric dip
Transit produces a flux drop of 2,290 ppm lasting ≈ 1.58 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029232
Semi-major axis / stellar radius
13.260
Impact parameter (b)
0.830
Transit mid-time (BJD)
2,454,957.7837
Long. of periastron (ω)
-75.00°
Angular separation (arcsec)
0.19900
Eq. Temperature
1,022K
(749 °C)
Insolation (S⊕)
186.31
Earth = 1.00
Earth Similarity (ESI)
0.195
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Sun et al. 2022Instrument
Kepler CCD Array
Publication
2022-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Kepler (6 shown).
Host System: KOI-984
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,295 K — cooler than the Sun (5,778 K)
Estimated Age
1.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.818 R☉
Stellar Mass
0.928 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.540 dex
Stellar density
2.397 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Total Proper Motion
58.414 mas/yr
PM Right Ascension
36.30 mas/yr
PM Declination
45.76 mas/yr
Galactic Cartesian (pc)
x = 0.287 · y = -0.747 · z = 0.600
Equatorial (J2000)
RA 291.04894° · Dec 36.84008°
Galactic ℓ, b
69.406° · 9.901°
Ecliptic λ, β
302.752° · 57.910°
HTM-20 index
-1722620655
Similar Worlds
Kepler-501 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.30 R⊕ · 3,670.0 ly
Kepler-38 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.30 R⊕ · 3,831.0 ly
Kepler-554 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.29 R⊕ · 2,252.2 ly
CoRoT-7 d
Neptune-like · G-type yellow (Sun-like)
Radius 4.31 R⊕ · 521.5 ly
HD 204313 c
Neptune-like · G-type yellow (Sun-like)
Radius 4.31 R⊕ · 155.9 ly
HD 109271 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.31 R⊕ · 182.2 ly