Key parameters at a glance

A radius of 1.60 Earth radii
A mass of 3.19 Earth masses
Surface gravity around 1.25 g
An orbital period of 40.837 days
Semi-major axis 0.2186 AU
Equilibrium temperature 496 K (223 °C)
Distance from Earth 1,817.32 light-years
Earth Similarity Index 0.585
Travel time at Voyager 1 speed 32,048,408 years

Kepler-1277 b Planet Profile

Physical Specs

Radius

1.60 R⊕

Radius (Jupiter)

0.143 R♃

Mass

3.19 M⊕

Mass (Jupiter)

0.010 M♃

Density

4.28 g/cm³

Surface Gravity

1.25 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.585

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

#570of 1176

top 48.4%

This planet

1.60R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-49 d 1.60 R⊕ Kepler-394 b 1.60 R⊕ Kepler-114 c 1.60 R⊕

Metric	Earth	Kepler-1277 b	Jupiter
Radius (R⊕)	1.00	1.60	11.21
Mass (M⊕)	1.00	3.19	317.83
Density (g/cm³)	5.51	4.28	1.33
Surface Gravity (g)	1.00	1.25	2.53
Insolation (S⊕)	1.00	12.11	0.037

Star Catalogue Identifiers

TIC

TIC 138969285

Gaia DR2

Gaia DR2 2076601230039790592

Gaia DR3

Gaia DR3 2076601230039790592

System

Kepler-1277

Percentile among Super-Earth cohort

Radius 1.600 R⊕ · percentile 50 / cohort 1176

Mass 3.190 M⊕ · percentile 46 / cohort 1176

Orbital period 40.84 d · percentile 95 / cohort 1164

Distance 557.19 pc · percentile 51 / cohort 1171

ESI 0.585 · percentile 80 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

40.837 days

Semi-major axis

0.2186 AU

Eccentricity

0.000

Inclination

89.65 °

Year Length

A year here lasts approximately 40.84 Earth days (11.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2186 AU.

Transit Fingerprint

Depth

0.028 %

Duration

4.944 h

Impact parameter b

0.363

Rp / R★

0.015840

Transit midpoint (BJD)

2,454,985.8751

Photometric dip

Transit produces a flux drop of 275 ppm lasting ≈ 4.94 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015840

Semi-major axis / stellar radius

59.600

Impact parameter (b)

0.363

Transit mid-time (BJD)

2,454,985.8751

Angular separation (arcsec)

0.39200

Eq. Temperature

496K

(223 °C)

Insolation (S⊕)

12.11

Earth = 1.00

Earth Similarity (ESI)

0.585

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-1277

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,578 K — cooler than the Sun (5,778 K)

Estimated Age

5.01 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.920 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.370 g/cm³

Metallicity ratio

[Fe/H]

Distance

557.19 parsec

Light-years 1,817.32 ly

V-band magnitude

14.31 mag

Voyager-speed travel 32,048,408 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.766 mas

Total Proper Motion

19.159 mas/yr

PM Right Ascension

19.09 mas/yr

PM Declination

-1.64 mas/yr

Galactic Cartesian (pc)

x = 0.322 · y = -0.688 · z = 0.650

Equatorial (J2000)

RA 295.10252° · Dec 40.57237°

Galactic ℓ, b

74.239° · 8.814°

Ecliptic λ, β

310.869° · 60.499°

HTM-20 index

1502058356