Key parameters at a glance
- A radius of 11.55 Earth radii
- A mass of 346.43 Earth masses
- Surface gravity around 2.60 g
- An orbital period of 1.706 days
- Semi-major axis 0.0269 AU
- Equilibrium temperature 1,459 K (1186 °C)
- Distance from Earth 856.83 light-years
- Earth Similarity Index 0.103
- Travel time at Voyager 1 speed 15,110,221 years
- Almost certainly tidally locked to its host star given the close orbit
KPS-1 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1585of 1771
top 89.4%
This planet
11.55R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | KPS-1 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.55 | 11.21 |
| Mass (M⊕) | 1.00 | 346.43 | 317.83 |
| Density (g/cm³) | 5.51 | 1.31 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.60 | 2.53 |
| Insolation (S⊕) | 1.00 | 729.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 346.435 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 99834717
Gaia DR2
Gaia DR2 1055895483267019392
Gaia DR3
Gaia DR3 1055895483267019392
System
KPS-1
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.71 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0269 AU.
Transit Fingerprint
Depth
1.098 %
Duration
1.680 h
Impact parameter b
0.754
Rp / R★
0.114300
Transit midpoint (BJD)
2,457,508.3702
Photometric dip
Transit produces a flux drop of 10,980 ppm lasting ≈ 1.68 h.
Extended Orbital Architecture
Planet / star radius ratio
0.114300
Semi-major axis / stellar radius
6.370
Impact parameter (b)
0.754
RV semi-amplitude (K)
198.700 m/s
Transit mid-time (BJD)
2,457,508.3702
Angular separation (arcsec)
0.10200
Eq. Temperature
1,459K
(1186 °C)
Insolation (S⊕)
729.00
Earth = 1.00
Earth Similarity (ESI)
0.103
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.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Burdanov et al. 2018Instrument
SBIG ST-8300M camera
Publication
2018-07
Observation locale
Ground
Host System: KPS-1
Spectral Class
K-type orange
Effective Temperature
5,165 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.907 R☉
Stellar Mass
0.892 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.470 dex
Stellar density
1.680 g/cm³
Rotational v·sin i
5.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.778 mas
Total Proper Motion
39.403 mas/yr
PM Right Ascension
-22.39 mas/yr
PM Declination
-32.43 mas/yr
Galactic Cartesian (pc)
x = -0.409 · y = 0.108 · z = 0.906
Equatorial (J2000)
RA 165.16720° · Dec 64.96385°
Galactic ℓ, b
140.127° · 48.300°
Ecliptic λ, β
131.656° · 52.016°
HTM-20 index
-1983375637
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