Key parameters at a glance
- A radius of 2.98 Earth radii
- A mass of 9.17 Earth masses
- Surface gravity around 1.03 g
- An orbital period of 159.394 days
- Semi-major axis 0.5333 AU
- Equilibrium temperature 289 K (16 °C)
- Distance from Earth 3,448.15 light-years
- Earth Similarity Index 0.715
- Travel time at Voyager 1 speed 60,808,190 years
Kepler-1881 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#541of 1978
top 27.3%
This planet
2.98R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1881 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.98 | 11.21 |
| Mass (M⊕) | 1.00 | 9.17 | 317.83 |
| Density (g/cm³) | 5.51 | 1.90 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.50 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270615772
Gaia DR2
Gaia DR2 2126446661968043136
Gaia DR3
Gaia DR3 2126446661968043136
System
Kepler-1881
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 159.39 Earth days (43.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5333 AU.
Transit Fingerprint
Depth
0.103 %
Duration
8.395 h
Impact parameter b
0.770
Rp / R★
0.028604
Transit midpoint (BJD)
2,455,059.9313
Photometric dip
Transit produces a flux drop of 1,033 ppm lasting ≈ 8.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028604
Semi-major axis / stellar radius
147.690
Impact parameter (b)
0.770
Transit mid-time (BJD)
2,455,059.9313
Angular separation (arcsec)
0.50400
Eq. Temperature
289K
(16 °C)
Insolation (S⊕)
1.50
Earth = 1.00
Earth Similarity (ESI)
0.715
0 = alien, 1 = Earth-identical
Within the conservative habitable zone — liquid water is physically possible with adequate atmospheric pressure.
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-1881
Spectral Class
K-type orange
Effective Temperature
5,135 K — cooler than the Sun (5,778 K)
Estimated Age
0.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.874 R☉
Stellar Mass
0.812 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.464 dex
Stellar density
2.399 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.918 mas
Total Proper Motion
15.449 mas/yr
PM Right Ascension
-8.51 mas/yr
PM Declination
12.90 mas/yr
Galactic Cartesian (pc)
x = 0.284 · y = -0.648 · z = 0.707
Equatorial (J2000)
RA 293.63931° · Dec 44.98254°
Galactic ℓ, b
77.709° · 11.806°
Ecliptic λ, β
312.148° · 65.000°
HTM-20 index
-1645977145
Similar Worlds
Kepler-1341 b
Sub-Neptune · K-type orange
Radius 2.99 R⊕ · 1,555.6 ly
TOI-1803 b
Sub-Neptune · K-type orange
Radius 2.99 R⊕ · 388.9 ly
Kepler-993 b
Sub-Neptune · K-type orange
Radius 2.97 R⊕ · 1,058.1 ly
HD 3167 c
Sub-Neptune · K-type orange
Radius 3.00 R⊕ · 154.2 ly
K2-136 c
Sub-Neptune · K-type orange
Radius 3.00 R⊕ · 193.2 ly
Kepler-1728 b
Sub-Neptune · K-type orange
Radius 2.96 R⊕ · 2,125.8 ly