Key parameters at a glance

A radius of 1.19 Earth radii
A mass of 1.81 Earth masses
Surface gravity around 1.28 g
An orbital period of 12.572 days
Semi-major axis 0.1086 AU
Equilibrium temperature 886 K (613 °C)
Distance from Earth 1,756.29 light-years
Earth Similarity Index 0.355
Travel time at Voyager 1 speed 30,972,139 years

Kepler-1276 b Planet Profile

Physical Specs

Radius

1.19 R⊕

Radius (Jupiter)

0.106 R♃

Mass

1.81 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.90 g/cm³

Surface Gravity

1.28 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.355

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

#101of 570

top 17.5%

This planet

1.19R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

KOI-351 c 1.19 R⊕ Kepler-953 c 1.19 R⊕ Kepler-310 b 1.19 R⊕

Metric	Earth	Kepler-1276 b	Jupiter
Radius (R⊕)	1.00	1.19	11.21
Mass (M⊕)	1.00	1.81	317.83
Density (g/cm³)	5.51	5.90	1.33
Surface Gravity (g)	1.00	1.28	2.53
Insolation (S⊕)	1.00	139.77	0.037

Star Catalogue Identifiers

TIC

TIC 121333541

Gaia DR2

Gaia DR2 2100623600597189504

Gaia DR3

Gaia DR3 2100623600597189504

System

Kepler-1276

Percentile among Rocky Terrestrial cohort

Radius 1.190 R⊕ · percentile 80 / cohort 570

Mass 1.810 M⊕ · percentile 74 / cohort 570

Orbital period 12.57 d · percentile 84 / cohort 567

Distance 538.48 pc · percentile 67 / cohort 566

ESI 0.355 · percentile 51 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

12.572 days

Semi-major axis

0.1086 AU

Eccentricity

0.000

Inclination

89.27 °

Year Length

A year here lasts approximately 12.57 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1086 AU.

Transit Fingerprint

Depth

0.009 %

Duration

4.717 h

Impact parameter b

0.710

Rp / R★

0.009254

Transit midpoint (BJD)

2,454,976.0818

Photometric dip

Transit produces a flux drop of 92 ppm lasting ≈ 4.72 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009254

Semi-major axis / stellar radius

13.800

Impact parameter (b)

0.710

Transit mid-time (BJD)

2,454,976.0818

Angular separation (arcsec)

0.20200

Eq. Temperature

886K

(613 °C)

Insolation (S⊕)

139.77

Earth = 1.00

Earth Similarity (ESI)

0.355

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-1276

Spectral Class

F-type yellow-white

Effective Temperature

6,188 K — hotter than the Sun (5,778 K)

Estimated Age

3.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.210 R☉

Stellar Mass

1.140 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.330 dex

Stellar density

0.800 g/cm³

Systemic radial velocity

-33.36 km/s

Metallicity ratio

[Fe/H]

Distance

538.48 parsec

Light-years 1,756.29 ly

V-band magnitude

12.99 mag

Voyager-speed travel 30,972,139 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.829 mas

Total Proper Motion

3.184 mas/yr

PM Right Ascension

-1.41 mas/yr

PM Declination

2.85 mas/yr

Galactic Cartesian (pc)

x = 0.233 · y = -0.723 · z = 0.650

Equatorial (J2000)

RA 287.85702° · Dec 40.54719°

Galactic ℓ, b

71.737° · 13.740°

Ecliptic λ, β

299.909° · 62.145°

HTM-20 index

-1785736752