Key parameters at a glance
- A radius of 1.29 Earth radii
- A mass of 2.21 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 4.264 days
- Semi-major axis 0.0480 AU
- Equilibrium temperature 1,179 K (906 °C)
- Distance from Earth 2,717.42 light-years
- Earth Similarity Index 0.259
- Travel time at Voyager 1 speed 47,921,657 years
1 sibling around Kepler-173
Kepler-173 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-173 b this | Super-Earth | 1.29 | 2.21 | 4.264 | 1,179 | 2014 |
| Kepler-173 c | Sub-Neptune | 2.43 | 6.48 | 8.006 | 956 | 2014 |
Kepler-173 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#1100of 1176
top 93.5%
This planet
1.29R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-173 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.29 | 11.21 |
| Mass (M⊕) | 1.00 | 2.21 | 317.83 |
| Density (g/cm³) | 5.51 | 5.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 599.50 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 378160351
Gaia DR2
Gaia DR2 2077485271747441280
Gaia DR3
Gaia DR3 2077485271747441280
System
Kepler-173
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.26 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0480 AU.
Transit Fingerprint
Depth
0.018 %
Duration
2.261 h
Impact parameter b
0.250
Rp / R★
0.012558
Transit midpoint (BJD)
2,454,966.7203
Photometric dip
Transit produces a flux drop of 183 ppm lasting ≈ 2.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.012558
Semi-major axis / stellar radius
10.700
Impact parameter (b)
0.250
Transit mid-time (BJD)
2,454,966.7203
Angular separation (arcsec)
0.05760
Eq. Temperature
1,179K
(906 °C)
Insolation (S⊕)
599.50
Earth = 1.00
Earth Similarity (ESI)
0.259
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-173
Spectral Class
F-type yellow-white
Effective Temperature
6,031 K — hotter than the Sun (5,778 K)
Estimated Age
3.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.949 R☉
Stellar Mass
1.067 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.404 dex
Stellar density
0.860 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.172 mas
Total Proper Motion
9.068 mas/yr
PM Right Ascension
-4.13 mas/yr
PM Declination
-8.07 mas/yr
Galactic Cartesian (pc)
x = 0.310 · y = -0.677 · z = 0.668
Equatorial (J2000)
RA 294.64662° · Dec 41.88410°
Galactic ℓ, b
75.248° · 9.734°
Ecliptic λ, β
311.147° · 61.848°
HTM-20 index
-1036932597
Similar Worlds
Kepler-312 b
Super-Earth · F-type yellow-white
Radius 1.29 R⊕ · 2,601.8 ly
Kepler-393 b
Super-Earth · F-type yellow-white
Radius 1.29 R⊕ · 2,874.8 ly
Kepler-1603 b
Super-Earth · F-type yellow-white
Radius 1.29 R⊕ · 8,847.2 ly
Kepler-132 c
Super-Earth · F-type yellow-white
Radius 1.28 R⊕ · 1,140.1 ly
Kepler-507 b
Super-Earth · F-type yellow-white
Radius 1.30 R⊕ · 1,277.4 ly
Kepler-1833 b
Super-Earth · F-type yellow-white
Radius 1.30 R⊕ · 1,929.5 ly