Key parameters at a glance

A radius of 17.49 Earth radii
A mass of 616.59 Earth masses
Surface gravity around 2.02 g
An orbital period of 2.703 days
Semi-major axis 0.0412 AU
Equilibrium temperature 1,816 K (1543 °C)
Distance from Earth 685.75 light-years
Earth Similarity Index 0.066
Travel time at Voyager 1 speed 12,093,192 years

KELT-3 b Planet Profile

Physical Specs

Radius

17.49 R⊕

Radius (Jupiter)

1.560 R♃

Mass

616.59 M⊕

Mass (Jupiter)

1.940 M♃

Density

0.75 g/cm³

Surface Gravity

2.02 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.066

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility KELT

Telescope Mamiya 645 80mm f/1.9

Size rank in cohort

Rank by radius

#94of 1771

top 5.3%

This planet

17.49R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-153 b 17.37 R⊕ KELT-18 b 17.60 R⊕ WASP-172 b 17.60 R⊕

Metric	Earth	KELT-3 b	Jupiter
Radius (R⊕)	1.00	17.49	11.21
Mass (M⊕)	1.00	616.59	317.83
Density (g/cm³)	5.51	0.75	1.33
Surface Gravity (g)	1.00	2.02	2.53
Insolation (S⊕)	1.00	1,704.57	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	616.590 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	467.190 M⊕	Lower bound from radial-velocity fitting.
Computed mass	469.589 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

TIC

TIC 67666096

Gaia DR2

Gaia DR2 806492019492266752

Gaia DR3

Gaia DR3 806492023789218688

System

KELT-3

Percentile among Gas Giant cohort

Radius 17.486 R⊕ · percentile 95 / cohort 1771

Mass 616.590 M⊕ · percentile 54 / cohort 1747

Orbital period 2.70 d · percentile 12 / cohort 1533

Distance 210.25 pc · percentile 51 / cohort 1759

ESI 0.066 · percentile 11 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.703 days

Semi-major axis

0.0412 AU

Eccentricity

0.000

Inclination

84.14 °

Year Length

A year here lasts approximately 2.70 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0412 AU.

Transit Fingerprint

Depth

0.890 %

Duration

3.151 h

Impact parameter b

0.606

Rp / R★

0.093900

Transit midpoint (BJD)

2,458,872.8544

Photometric dip

Transit produces a flux drop of 8,900 ppm lasting ≈ 3.15 h.

Extended Orbital Architecture

Planet / star radius ratio

0.093900

Semi-major axis / stellar radius

6.000

Impact parameter (b)

0.606

RV semi-amplitude (K)

179.600 m/s

Transit mid-time (BJD)

2,458,872.8544

Long. of periastron (ω)

90.00°

Sky-projected obliquity (λ)

-5.00°

Angular separation (arcsec)

0.19600

Eq. Temperature

1,816K

(1543 °C)

Insolation (S⊕)

1,704.57

Earth = 1.00

Earth Similarity (ESI)

0.066

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. 2013

Instrument

Apogee 4K CCD Sensor

Publication

2013-08

Observation locale

Ground

Host System: KELT-3

Spectral Class

F-type yellow-white

Effective Temperature

6,304 K — hotter than the Sun (5,778 K)

Estimated Age

3.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.700 R☉

Stellar Mass

1.960 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.560 g/cm³

Systemic radial velocity

27.90 km/s

Rotational v·sin i

7.20 km/s

Metallicity ratio

[Fe/H]

Distance

210.25 parsec

Light-years 685.75 ly

V-band magnitude

9.82 mag

Voyager-speed travel 12,093,192 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.732 mas

Total Proper Motion

37.394 mas/yr

PM Right Ascension

-28.33 mas/yr

PM Declination

-24.41 mas/yr

Galactic Cartesian (pc)

x = -0.650 · y = 0.396 · z = 0.648

Equatorial (J2000)

RA 148.64312° · Dec 40.38794°

Galactic ℓ, b

181.256° · 51.380°

Ecliptic λ, β

136.304° · 25.902°

HTM-20 index

1013667757