Key parameters at a glance
- A radius of 2.15 Earth radii
- A mass of 5.27 Earth masses
- Surface gravity around 1.14 g
- An orbital period of 59.878 days
- Semi-major axis 0.2486 AU
- Equilibrium temperature 273 K (0 °C)
- Distance from Earth 1,092.88 light-years
- Earth Similarity Index 0.783
- Travel time at Voyager 1 speed 19,272,942 years
Context from the literature
Kepler-61b is a super-Earth exoplanet orbiting within parts of the habitable zone of the K-type main-sequence star Kepler-61. It is located about 1,100 light-years from Earth in the constellation of Cygnus. It was discovered in 2013 using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured, by NASA's Kepler spacecraft.
Excerpted from Wikipedia · full article
Kepler-61 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1741of 1978
top 88.0%
This planet
2.15R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-61 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.15 | 11.21 |
| Mass (M⊕) | 1.00 | 5.27 | 317.83 |
| Density (g/cm³) | 5.51 | 2.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.69 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271537530
Gaia DR2
Gaia DR2 2077889892023816960
Gaia DR3
Gaia DR3 2077889892023816960
System
Kepler-61
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 59.88 Earth days (16.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2486 AU.
Transit Fingerprint
Depth
0.138 %
Duration
4.845 h
Impact parameter b
0.290
Rp / R★
0.033010
Transit midpoint (BJD)
2,454,984.1880
Photometric dip
Transit produces a flux drop of 1,385 ppm lasting ≈ 4.85 h.
Extended Orbital Architecture
Planet / star radius ratio
0.033010
Semi-major axis / stellar radius
90.600
Impact parameter (b)
0.290
Transit mid-time (BJD)
2,454,984.1880
Angular separation (arcsec)
0.74200
Eq. Temperature
273K
(0 °C)
Insolation (S⊕)
1.69
Earth = 1.00
Earth Similarity (ESI)
0.783
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Discovery Paper
Primary reference
Ballard et al. 2013Instrument
Kepler CCD Array
Publication
2013-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-61
Spectral Class
K-type orange
Effective Temperature
4,017 K — cooler than the Sun (5,778 K)
Estimated Age
1.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.620 R☉
Stellar Mass
0.635 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.670 dex
Stellar density
4.932 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.957 mas
Total Proper Motion
10.722 mas/yr
PM Right Ascension
-2.25 mas/yr
PM Declination
10.48 mas/yr
Galactic Cartesian (pc)
x = 0.315 · y = -0.667 · z = 0.675
Equatorial (J2000)
RA 295.30449° · Dec 42.47532°
Galactic ℓ, b
76.010° · 9.582°
Ecliptic λ, β
312.569° · 62.225°
HTM-20 index
-1572054991
Similar Worlds
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Sub-Neptune · K-type orange
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K2-71 b
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Kepler-566 b
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Kepler-1013 b
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Kepler-1455 b
Sub-Neptune · K-type orange
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Kepler-437 b
Sub-Neptune · K-type orange
Radius 2.14 R⊕ · 991.5 ly