Key parameters at a glance
- A radius of 2.68 Earth radii
- A mass of 7.65 Earth masses
- Surface gravity around 1.07 g
- An orbital period of 5.350 days
- Semi-major axis 0.0595 AU
- Equilibrium temperature 989 K (716 °C)
- Distance from Earth 2,026.66 light-years
- Earth Similarity Index 0.246
- Travel time at Voyager 1 speed 35,740,176 years
1 sibling around Kepler-561
Kepler-561 c 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-561 c this | Sub-Neptune | 2.68 | 7.65 | 5.350 | 989 | 2016 |
| Kepler-561 b | Neptune-like | 6.96 | 38.70 | 58.362 | 446 | 2016 |
Kepler-561 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#896of 1978
top 45.2%
This planet
2.68R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-561 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.68 | 11.21 |
| Mass (M⊕) | 1.00 | 7.65 | 317.83 |
| Density (g/cm³) | 5.51 | 2.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 183.17 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270700432
Gaia DR2
Gaia DR2 2126454633427425664
Gaia DR3
Gaia DR3 2126454633427425664
System
Kepler-561
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.35 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0595 AU.
Transit Fingerprint
Depth
0.076 %
Duration
2.243 h
Impact parameter b
0.580
Rp / R★
0.025593
Transit midpoint (BJD)
2,455,028.7605
Photometric dip
Transit produces a flux drop of 765 ppm lasting ≈ 2.24 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025593
Semi-major axis / stellar radius
18.491
Impact parameter (b)
0.580
Transit mid-time (BJD)
2,455,028.7605
Angular separation (arcsec)
0.09570
Eq. Temperature
989K
(716 °C)
Insolation (S⊕)
183.17
Earth = 1.00
Earth Similarity (ESI)
0.246
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-561
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,646 K — cooler than the Sun (5,778 K)
Estimated Age
4.27 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.940 R☉
Stellar Mass
0.960 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.480 dex
Stellar density
1.400 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.581 mas
Total Proper Motion
4.457 mas/yr
PM Right Ascension
4.07 mas/yr
PM Declination
-1.81 mas/yr
Galactic Cartesian (pc)
x = 0.284 · y = -0.646 · z = 0.708
Equatorial (J2000)
RA 293.74711° · Dec 45.10720°
Galactic ℓ, b
77.858° · 11.794°
Ecliptic λ, β
312.427° · 65.086°
HTM-20 index
-1658220320
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K2-58 b
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Kepler-487 c
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Kepler-899 b
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K2-402 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.68 R⊕ · 1,706.0 ly