Key parameters at a glance

A radius of 15.13 Earth radii
A mass of 65.15 Earth masses
Surface gravity around 0.28 g
An orbital period of 4.736 days
Semi-major axis 0.0623 AU
Equilibrium temperature 1,712 K (1439 °C)
Distance from Earth 323.41 light-years
Earth Similarity Index 0.049
Travel time at Voyager 1 speed 5,703,423 years

KELT-11 b Planet Profile

Physical Specs

Radius

15.13 R⊕

Radius (Jupiter)

1.350 R♃

Mass

65.15 M⊕

Mass (Jupiter)

0.205 M♃

Density

0.09 g/cm³

Surface Gravity

0.28 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.049

HZ Position Inner

Controversial No

Discovery

Year 2017

Method Transit

Facility KELT-South

Telescope Mamiya 645 80mm f/1.9

Size rank in cohort

Rank by radius

#221of 1771

top 12.4%

This planet

15.13R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-108 b 15.13 R⊕ WASP-123 b 15.13 R⊕ KELT-2 A b 15.13 R⊕

Metric	Earth	KELT-11 b	Jupiter
Radius (R⊕)	1.00	15.13	11.21
Mass (M⊕)	1.00	65.15	317.83
Density (g/cm³)	5.51	0.09	1.33
Surface Gravity (g)	1.00	0.28	2.53
Insolation (S⊕)	1.00	1,433.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	65.155 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	61.977 M⊕	Lower bound from radial-velocity fitting.
Computed mass	62.144 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD 93396

HIP

HIP 52733

TIC

TIC 55092869

Gaia DR2

Gaia DR2 3761497761876022400

Gaia DR3

Gaia DR3 3761497761876022400

System

KELT-11

Percentile among Gas Giant cohort

Radius 15.132 R⊕ · percentile 87 / cohort 1771

Mass 65.155 M⊕ · percentile 1 / cohort 1747

Orbital period 4.74 d · percentile 35 / cohort 1533

Distance 99.16 pc · percentile 34 / cohort 1759

ESI 0.049 · percentile 4 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.736 days

Semi-major axis

0.0623 AU

Eccentricity

0.000

Inclination

85.30 °

Year Length

A year here lasts approximately 4.74 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0623 AU.

Transit Fingerprint

Depth

0.234 %

Duration

7.100 h

Impact parameter b

0.404

Rp / R★

0.051900

Transit midpoint (BJD)

2,455,498.9590

Photometric dip

Transit produces a flux drop of 2,339 ppm lasting ≈ 7.10 h.

Extended Orbital Architecture

Planet / star radius ratio

0.051900

Semi-major axis / stellar radius

4.980

Impact parameter (b)

0.404

RV semi-amplitude (K)

19.490 m/s

Transit mid-time (BJD)

2,455,498.9590

Long. of periastron (ω)

116.00°

Sky-projected obliquity (λ)

-77.86°

Angular separation (arcsec)

0.62800

Eq. Temperature

1,712K

(1439 °C)

Insolation (S⊕)

1,433.00

Earth = 1.00

Earth Similarity (ESI)

0.049

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

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

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Pepper et al. 2017

Instrument

Apogee 4K CCD Sensor

Publication

2017-05

Observation locale

Ground

Host System: KELT-11

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,375 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.690 R☉

Stellar Mass

1.440 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

3.700 dex

Stellar density

0.104 g/cm³

Systemic radial velocity

35.10 km/s

Rotational v·sin i

1.99 km/s

Metallicity ratio

[Fe/H]

Distance

99.16 parsec

Light-years 323.41 ly

V-band magnitude

8.04 mag

Voyager-speed travel 5,703,423 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

10.056 mas

Total Proper Motion

111.488 mas/yr

PM Right Ascension

-79.09 mas/yr

PM Declination

-78.58 mas/yr

Galactic Cartesian (pc)

x = -0.937 · y = 0.310 · z = -0.163

Equatorial (J2000)

RA 161.70691° · Dec -9.39936°

Galactic ℓ, b

259.031° · 42.606°

Ecliptic λ, β

166.828° · -15.844°

HTM-20 index

482355375

Observation Record

Photometric series

Stellar spectra

Transmission spectra

Emission spectra

Archive notes