Key parameters at a glance

A radius of 3.04 Earth radii
A mass of 9.46 Earth masses
Surface gravity around 1.03 g
An orbital period of 3.925 days
Semi-major axis 0.0478 AU
Equilibrium temperature 1,074 K (801 °C)
Distance from Earth 5,885.03 light-years
Earth Similarity Index 0.214
Travel time at Voyager 1 speed 103,782,470 years

Kepler-1844 b Planet Profile

Physical Specs

Radius

3.04 R⊕

Radius (Jupiter)

0.271 R♃

Mass

9.46 M⊕

Mass (Jupiter)

0.030 M♃

Density

1.86 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.214

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#488of 1978

top 24.6%

This planet

3.04R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1664 b 3.03 R⊕ TOI-1438 b 3.04 R⊕ Kepler-1779 b 3.03 R⊕

Metric	Earth	Kepler-1844 b	Jupiter
Radius (R⊕)	1.00	3.04	11.21
Mass (M⊕)	1.00	9.46	317.83
Density (g/cm³)	5.51	1.86	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	314.25	0.037

Star Catalogue Identifiers

TIC

TIC 137817056

Gaia DR2

Gaia DR2 2051868300086828544

Gaia DR3

Gaia DR3 2051868300086828544

System

Kepler-1844

Percentile among Sub-Neptune cohort

Radius 3.036 R⊕ · percentile 75 / cohort 1978

Mass 9.460 M⊕ · percentile 69 / cohort 1978

Orbital period 3.92 d · percentile 8 / cohort 1946

Distance 1,804.36 pc · percentile 96 / cohort 1975

ESI 0.214 · percentile 9 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.925 days

Semi-major axis

0.0478 AU

Eccentricity

0.000

Inclination

89.22 °

Year Length

A year here lasts approximately 3.92 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0478 AU.

Transit Fingerprint

Depth

0.046 %

Duration

3.708 h

Impact parameter b

0.710

Rp / R★

0.019616

Transit midpoint (BJD)

2,454,965.4018

Photometric dip

Transit produces a flux drop of 464 ppm lasting ≈ 3.71 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019616

Semi-major axis / stellar radius

8.254

Impact parameter (b)

0.710

Transit mid-time (BJD)

2,454,965.4018

Angular separation (arcsec)

0.02650

Eq. Temperature

1,074K

(801 °C)

Insolation (S⊕)

314.25

Earth = 1.00

Earth Similarity (ESI)

0.214

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1844

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,776 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.849 R☉

Stellar Mass

0.939 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

4.554 dex

Stellar density

0.691 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,804.36 parsec

Light-years 5,885.03 ly

V-band magnitude

16.00 mag

Voyager-speed travel 103,782,470 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

0.528 mas

Total Proper Motion

2.359 mas/yr

PM Right Ascension

-1.27 mas/yr

PM Declination

-1.99 mas/yr

Galactic Cartesian (pc)

x = 0.304 · y = -0.728 · z = 0.615

Equatorial (J2000)

RA 292.69040° · Dec 37.93457°

Galactic ℓ, b

70.995° · 9.234°

Ecliptic λ, β

305.717° · 58.592°

HTM-20 index

1303504027