Key parameters at a glance

A radius of 2.49 Earth radii
A mass of 6.76 Earth masses
Surface gravity around 1.09 g
An orbital period of 28.626 days
Semi-major axis 0.1857 AU
Equilibrium temperature 573 K (300 °C)
Distance from Earth 3,634.16 light-years
Earth Similarity Index 0.440
Travel time at Voyager 1 speed 64,088,419 years

Kepler-1273 b Planet Profile

Physical Specs

Radius

2.49 R⊕

Radius (Jupiter)

0.222 R♃

Mass

6.76 M⊕

Mass (Jupiter)

0.021 M♃

Density

2.41 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.440

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1191of 1978

top 60.2%

This planet

2.49R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-184 d 2.49 R⊕ HD 176986 d 2.49 R⊕ Kepler-11 f 2.49 R⊕

Metric	Earth	Kepler-1273 b	Jupiter
Radius (R⊕)	1.00	2.49	11.21
Mass (M⊕)	1.00	6.76	317.83
Density (g/cm³)	5.51	2.41	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	14.88	0.037

Star Catalogue Identifiers

TIC

TIC 279913214

Gaia DR2

Gaia DR2 2106311477324720384

Gaia DR3

Gaia DR3 2106311477324720384

System

Kepler-1273

Percentile among Sub-Neptune cohort

Radius 2.490 R⊕ · percentile 39 / cohort 1978

Mass 6.760 M⊕ · percentile 37 / cohort 1978

Orbital period 28.63 d · percentile 72 / cohort 1946

Distance 1,114.24 pc · percentile 84 / cohort 1975

ESI 0.440 · percentile 60 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

28.626 days

Semi-major axis

0.1857 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 28.63 Earth days (7.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1857 AU.

Transit Fingerprint

Depth

0.065 %

Duration

4.601 h

Impact parameter b

0.021

Rp / R★

0.025211

Transit midpoint (BJD)

2,454,991.1132

Photometric dip

Transit produces a flux drop of 653 ppm lasting ≈ 4.60 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025211

Semi-major axis / stellar radius

49.160

Impact parameter (b)

0.021

Transit mid-time (BJD)

2,454,991.1132

Angular separation (arcsec)

0.16700

Eq. Temperature

573K

(300 °C)

Insolation (S⊕)

14.88

Earth = 1.00

Earth Similarity (ESI)

0.440

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. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1273

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,566 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.910 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

2.743 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,114.24 parsec

Light-years 3,634.16 ly

V-band magnitude

16.03 mag

Voyager-speed travel 64,088,419 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.870 mas

Total Proper Motion

8.737 mas/yr

PM Right Ascension

-3.18 mas/yr

PM Declination

-8.14 mas/yr

Galactic Cartesian (pc)

x = 0.193 · y = -0.682 · z = 0.706

Equatorial (J2000)

RA 285.80320° · Dec 44.87340°

Galactic ℓ, b

75.256° · 16.818°

Ecliptic λ, β

299.221° · 66.716°

HTM-20 index

-2005033038