Key parameters at a glance
- A radius of 6.96 Earth radii
- A mass of 38.70 Earth masses
- Surface gravity around 0.80 g
- An orbital period of 58.362 days
- Semi-major axis 0.2926 AU
- Equilibrium temperature 446 K (173 °C)
- Distance from Earth 2,026.66 light-years
- Earth Similarity Index 0.350
- Travel time at Voyager 1 speed 35,740,176 years
1 sibling around Kepler-561
Kepler-561 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-561 c | Sub-Neptune | 2.68 | 7.65 | 5.350 | 989 | 2016 |
| Kepler-561 b this | Neptune-like | 6.96 | 38.70 | 58.362 | 446 | 2016 |
Kepler-561 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#206of 574
top 35.7%
This planet
6.96R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-561 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.96 | 11.21 |
| Mass (M⊕) | 1.00 | 38.70 | 317.83 |
| Density (g/cm³) | 5.51 | 0.63 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.80 | 2.53 |
| Insolation (S⊕) | 1.00 | 7.57 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270700432
Gaia DR2
Gaia DR2 2126454633427425664
Gaia DR3
Gaia DR3 2126454633427425664
System
Kepler-561
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 58.36 Earth days (16.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2926 AU.
Transit Fingerprint
Depth
0.564 %
Duration
6.286 h
Impact parameter b
0.047
Rp / R★
0.067643
Transit midpoint (BJD)
2,455,029.5551
Photometric dip
Transit produces a flux drop of 5,635 ppm lasting ≈ 6.29 h.
Extended Orbital Architecture
Planet / star radius ratio
0.067643
Semi-major axis / stellar radius
75.657
Impact parameter (b)
0.047
Transit mid-time (BJD)
2,455,029.5551
Angular separation (arcsec)
0.47100
Eq. Temperature
446K
(173 °C)
Insolation (S⊕)
7.57
Earth = 1.00
Earth Similarity (ESI)
0.350
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-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
Similar Worlds
Kepler-18 d
Neptune-like · G-type yellow (Sun-like)
Radius 6.98 R⊕ · 1,412.4 ly
Kepler-546 b
Neptune-like · G-type yellow (Sun-like)
Radius 7.00 R⊕ · 3,325.6 ly
HD 25912 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.90 R⊕ · 160.4 ly
HATS-38 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.88 R⊕ · 1,120.4 ly
HD 34445 f
Neptune-like · G-type yellow (Sun-like)
Radius 6.88 R⊕ · 150.3 ly
Kepler-799 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.88 R⊕ · 4,922.0 ly