Key parameters at a glance
- A radius of 2.12 Earth radii
- A mass of 5.13 Earth masses
- Surface gravity around 1.14 g
- An orbital period of 6.309 days
- Semi-major axis 0.0540 AU
- Equilibrium temperature 606 K (333 °C)
- Distance from Earth 1,992.95 light-years
- Earth Similarity Index 0.443
- Travel time at Voyager 1 speed 35,145,616 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1880 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1801of 1978
top 91.0%
This planet
2.12R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1880 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.12 | 11.21 |
| Mass (M⊕) | 1.00 | 5.13 | 317.83 |
| Density (g/cm³) | 5.51 | 2.97 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 31.73 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 121333305
Gaia DR2
Gaia DR2 2100625696541277312
Gaia DR3
Gaia DR3 2100625696541277312
System
Kepler-1880
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.31 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0540 AU.
Transit Fingerprint
Depth
0.069 %
Duration
1.283 h
Impact parameter b
0.118
Rp / R★
0.023605
Transit midpoint (BJD)
2,454,966.9941
Photometric dip
Transit produces a flux drop of 691 ppm lasting ≈ 1.28 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023605
Semi-major axis / stellar radius
38.360
Impact parameter (b)
0.118
Transit mid-time (BJD)
2,454,966.9941
Angular separation (arcsec)
0.08840
Eq. Temperature
606K
(333 °C)
Insolation (S⊕)
31.73
Earth = 1.00
Earth Similarity (ESI)
0.443
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1880
Spectral Class
K-type orange
Effective Temperature
4,380 K — cooler than the Sun (5,778 K)
Estimated Age
13.60 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.530 R☉
Stellar Mass
0.524 M☉
Metallicity [Fe/H]
-0.92
Extended Stellar Properties
Surface gravity (log g)
4.710 dex
Stellar density
24.050 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.608 mas
Total Proper Motion
10.750 mas/yr
PM Right Ascension
10.60 mas/yr
PM Declination
-1.77 mas/yr
Galactic Cartesian (pc)
x = 0.232 · y = -0.722 · z = 0.652
Equatorial (J2000)
RA 287.82646° · Dec 40.69660°
Galactic ℓ, b
71.868° · 13.822°
Ecliptic λ, β
299.945° · 62.295°
HTM-20 index
-1301479857
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Sub-Neptune · K-type orange
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Kepler-161 b
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HD 39194 d
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HD 97658 b
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Kepler-158 b
Sub-Neptune · K-type orange
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K2-247 b
Sub-Neptune · K-type orange
Radius 2.12 R⊕ · 841.9 ly