Key parameters at a glance

A radius of 19.50 Earth radii
A mass of 416.36 Earth masses
Surface gravity around 1.09 g
An orbital period of 3.329 days
Semi-major axis 0.0461 AU
Equilibrium temperature 1,642 K (1369 °C)
Distance from Earth 1,058.97 light-years
Earth Similarity Index 0.063
Travel time at Voyager 1 speed 18,674,989 years

KELT-15 b Planet Profile

Physical Specs

Radius

19.50 R⊕

Radius (Jupiter)

1.740 R♃

Mass

416.36 M⊕

Mass (Jupiter)

1.310 M♃

Density

0.36 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.063

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility KELT-South

Telescope Mamiya 645 80mm f/1.9

Size rank in cohort

Rank by radius

#39of 1771

top 2.1%

This planet

19.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-57 b 19.50 R⊕ KELT-20 b 19.51 R⊕ WASP-121 b 19.53 R⊕

Metric	Earth	KELT-15 b	Jupiter
Radius (R⊕)	1.00	19.50	11.21
Mass (M⊕)	1.00	416.36	317.83
Density (g/cm³)	5.51	0.36	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	1,612.76	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	416.357 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	289.225 M⊕	Lower bound from radial-velocity fitting.
Computed mass	289.353 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

TIC

TIC 268644785

Gaia DR2

Gaia DR2 5489780919480009472

Gaia DR3

Gaia DR3 5489780919480009472

System

KELT-15

Percentile among Gas Giant cohort

Radius 19.504 R⊕ · percentile 98 / cohort 1771

Mass 416.357 M⊕ · percentile 43 / cohort 1747

Orbital period 3.33 d · percentile 20 / cohort 1533

Distance 324.68 pc · percentile 63 / cohort 1759

ESI 0.063 · percentile 10 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.329 days

Semi-major axis

0.0461 AU

Eccentricity

0.000

Inclination

88.30 °

Year Length

A year here lasts approximately 3.33 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0461 AU.

Transit Fingerprint

Depth

1.000 %

Duration

4.012 h

Impact parameter b

0.200

Rp / R★

0.100100

Transit midpoint (BJD)

2,458,973.5781

Photometric dip

Transit produces a flux drop of 10,000 ppm lasting ≈ 4.01 h.

Extended Orbital Architecture

Planet / star radius ratio

0.100100

Semi-major axis / stellar radius

6.700

Impact parameter (b)

0.200

RV semi-amplitude (K)

110.000 m/s

Transit mid-time (BJD)

2,458,973.5781

Angular separation (arcsec)

0.14200

Eq. Temperature

1,642K

(1369 °C)

Insolation (S⊕)

1,612.76

Earth = 1.00

Earth Similarity (ESI)

0.063

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

Rodriguez et al. 2016

Instrument

Apogee 4K CCD Sensor

Publication

2016-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at KELT-South (2 shown).

KELT-10 b · Gas Giant KELT-14 b · Gas Giant

Host System: KELT-15

Spectral Class

F-type yellow-white

Effective Temperature

6,003 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.780 R☉

Stellar Mass

2.060 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.170 dex

Stellar density

0.510 g/cm³

Systemic radial velocity

12.20 km/s

Rotational v·sin i

7.60 km/s

Metallicity ratio

[Fe/H]

Distance

324.68 parsec

Light-years 1,058.97 ly

V-band magnitude

11.39 mag

Voyager-speed travel 18,674,989 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

3.051 mas

Total Proper Motion

5.061 mas/yr

PM Right Ascension

-4.52 mas/yr

PM Declination

-2.28 mas/yr

Galactic Cartesian (pc)

x = -0.283 · y = 0.545 · z = -0.789

Equatorial (J2000)

RA 117.41498° · Dec -52.12045°

Galactic ℓ, b

265.372° · -12.860°

Ecliptic λ, β

146.639° · -70.217°

HTM-20 index

1770966864