Key parameters at a glance

A radius of 2.80 Earth radii
A mass of 16.30 Earth masses
Surface gravity around 2.08 g
An orbital period of 48.648 days
Semi-major axis 0.2467 AU
Equilibrium temperature 489 K (216 °C)
Distance from Earth 3,734.03 light-years
Earth Similarity Index 0.375
Travel time at Voyager 1 speed 65,849,608 years

2 siblings around Kepler-276

Kepler-276 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-276 b	Sub-Neptune	2.87	731.21	14.128	739	2014
Kepler-276 c	Sub-Neptune	2.90	16.60	31.884	563	2013
Kepler-276 d this	Sub-Neptune	2.80	16.30	48.648	489	2013

Kepler-276 d Planet Profile

Physical Specs

Radius

2.80 R⊕

Radius (Jupiter)

0.250 R♃

Mass

16.30 M⊕

Mass (Jupiter)

0.051 M♃

Density

0.76 g/cm³

Surface Gravity

2.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.375

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#742of 1978

top 37.5%

This planet

2.80R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-912 b 2.80 R⊕ Kepler-350 d 2.80 R⊕ Kepler-694 b 2.80 R⊕

Metric	Earth	Kepler-276 d	Jupiter
Radius (R⊕)	1.00	2.80	11.21
Mass (M⊕)	1.00	16.30	317.83
Density (g/cm³)	5.51	0.76	1.33
Surface Gravity (g)	1.00	2.08	2.53
Insolation (S⊕)	1.00	11.27	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	16.300 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 138213510

Gaia DR2

Gaia DR2 2052304325169514880

Gaia DR3

Gaia DR3 2052304325169514880

System

Kepler-276

Percentile among Sub-Neptune cohort

Radius 2.800 R⊕ · percentile 62 / cohort 1978

Mass 16.300 M⊕ · percentile 94 / cohort 1978

Orbital period 48.65 d · percentile 85 / cohort 1946

Distance 1,144.86 pc · percentile 85 / cohort 1975

ESI 0.375 · percentile 47 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

48.648 days

Semi-major axis

0.2467 AU

Eccentricity

0.000

Inclination

87.42 °

Year Length

A year here lasts approximately 48.65 Earth days (13.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2467 AU.

Transit Fingerprint

Depth

0.062 %

Duration

4.563 h

Impact parameter b

0.897

Rp / R★

0.029490

Transit midpoint (BJD)

2,455,005.1273

Photometric dip

Transit produces a flux drop of 621 ppm lasting ≈ 4.56 h.

Extended Orbital Architecture

Planet / star radius ratio

0.029490

Semi-major axis / stellar radius

46.950

Impact parameter (b)

0.897

Transit mid-time (BJD)

2,455,005.1273

Angular separation (arcsec)

0.21500

Eq. Temperature

489K

(216 °C)

Insolation (S⊕)

11.27

Earth = 1.00

Earth Similarity (ESI)

0.375

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Xie 2014

Instrument

Kepler CCD Array

Publication

2014-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 c · Super-Earth

Host System: Kepler-276

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,693 K — cooler than the Sun (5,778 K)

Estimated Age

0.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.030 R☉

Stellar Mass

1.100 M☉

Metallicity [Fe/H]

-0.29

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

1.270 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,144.86 parsec

Light-years 3,734.03 ly

V-band magnitude

15.48 mag

Voyager-speed travel 65,849,608 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.846 mas

Total Proper Motion

8.070 mas/yr

PM Right Ascension

8.00 mas/yr

PM Declination

1.10 mas/yr

Galactic Cartesian (pc)

x = 0.311 · y = -0.712 · z = 0.630

Equatorial (J2000)

RA 293.56820° · Dec 39.03631°

Galactic ℓ, b

72.306° · 9.133°

Ecliptic λ, β

307.638° · 59.434°

HTM-20 index

1302657699