Key parameters at a glance
- A radius of 15.32 Earth radii
- A mass of 257.44 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 6.247 days
- Semi-major axis 0.0731 AU
- Equilibrium temperature 2,040 K (1767 °C)
- Distance from Earth 4,222.71 light-years
- Earth Similarity Index 0.053
- Travel time at Voyager 1 speed 74,467,471 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-91 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#208of 1771
top 11.7%
This planet
15.32R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-91 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.32 | 11.21 |
| Mass (M⊕) | 1.00 | 257.44 | 317.83 |
| Density (g/cm³) | 5.51 | 0.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,273.32 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 257.442 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 352011875
Gaia DR2
Gaia DR2 2105909326647414400
Gaia DR3
Gaia DR3 2105909326647414400
System
Kepler-91
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.25 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0731 AU.
Transit Fingerprint
Depth
0.040 %
Duration
11.261 h
Impact parameter b
0.867
Rp / R★
0.021810
Transit midpoint (BJD)
2,454,969.3958
Photometric dip
Transit produces a flux drop of 397 ppm lasting ≈ 11.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021810
Semi-major axis / stellar radius
2.496
Impact parameter (b)
0.867
RV semi-amplitude (K)
70.000 m/s
Occultation depth
0.004 ppm
Transit mid-time (BJD)
2,454,969.3958
Long. of periastron (ω)
-57.20°
Angular separation (arcsec)
0.05650
Eq. Temperature
2,040K
(1767 °C)
Insolation (S⊕)
3,273.32
Earth = 1.00
Earth Similarity (ESI)
0.053
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Orbital-brightness modulation
Host star brightness varies with the planet's orbit.
Discovery Paper
Primary reference
Lillo Box et al. 2014Instrument
Kepler CCD Array
Publication
2014-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-91
Spectral Class
K-type orange
Effective Temperature
4,550 K — cooler than the Sun (5,778 K)
Estimated Age
4.47 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
6.300 R☉
Stellar Mass
1.310 M☉
Metallicity [Fe/H]
0.11
Extended Stellar Properties
Surface gravity (log g)
2.953 dex
Stellar density
0.007 g/cm³
Systemic radial velocity
-62.01 km/s
Rotational v·sin i
6.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.744 mas
Total Proper Motion
4.260 mas/yr
PM Right Ascension
-0.77 mas/yr
PM Declination
4.19 mas/yr
Galactic Cartesian (pc)
x = 0.194 · y = -0.691 · z = 0.696
Equatorial (J2000)
RA 285.67290° · Dec 44.11675°
Galactic ℓ, b
74.486° · 16.622°
Ecliptic λ, β
298.490° · 66.013°
HTM-20 index
256248480
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