Key parameters at a glance
- A radius of 1.96 Earth radii
- A mass of 4.50 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 49.608 days
- Semi-major axis 0.2489 AU
- Equilibrium temperature 402 K (129 °C)
- Distance from Earth 1,071.49 light-years
- Earth Similarity Index 0.653
- Travel time at Voyager 1 speed 18,895,684 years
Kepler-973 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#49of 1176
top 4.1%
This planet
1.96R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-973 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.96 | 11.21 |
| Mass (M⊕) | 1.00 | 4.50 | 317.83 |
| Density (g/cm³) | 5.51 | 3.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 7.89 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 267747398
Gaia DR2
Gaia DR2 2130024026126714880
Gaia DR3
Gaia DR3 2130024026126714880
System
Kepler-973
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 49.61 Earth days (13.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2489 AU.
Transit Fingerprint
Depth
0.063 %
Duration
2.842 h
Impact parameter b
0.004
Rp / R★
0.022756
Transit midpoint (BJD)
2,454,971.4142
Photometric dip
Transit produces a flux drop of 627 ppm lasting ≈ 2.84 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022756
Semi-major axis / stellar radius
136.370
Impact parameter (b)
0.004
Transit mid-time (BJD)
2,454,971.4142
Angular separation (arcsec)
0.75800
Eq. Temperature
402K
(129 °C)
Insolation (S⊕)
7.89
Earth = 1.00
Earth Similarity (ESI)
0.653
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-973
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,213 K — cooler than the Sun (5,778 K)
Estimated Age
2.29 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
1.290 g/cm³
Systemic radial velocity
-22.84 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.016 mas
Total Proper Motion
16.068 mas/yr
PM Right Ascension
5.42 mas/yr
PM Declination
-15.13 mas/yr
Galactic Cartesian (pc)
x = 0.222 · y = -0.604 · z = 0.765
Equatorial (J2000)
RA 290.16532° · Dec 49.92381°
Galactic ℓ, b
81.296° · 16.025°
Ecliptic λ, β
311.582° · 70.466°
HTM-20 index
1005504757
Similar Worlds
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Super-Earth · G-type yellow (Sun-like)
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Kepler-1392 b
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Kepler-792 b
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K2-86 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.96 R⊕ · 843.8 ly