Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,538.30 Earth masses
Surface gravity around 9.39 g
An orbital period of 4.119 days
Semi-major axis 0.0549 AU
Equilibrium temperature 1,605 K (1332 °C)
Distance from Earth 2,112.17 light-years
Earth Similarity Index 0.101
Travel time at Voyager 1 speed 37,248,115 years

NGTS-13 b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.142 R♃

Mass

1,538.30 M⊕

Mass (Jupiter)

4.840 M♃

Density

4.02 g/cm³

Surface Gravity

9.39 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.101

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Next-Generation Transit Survey (NGTS)

Telescope 20 cm NGTS telescope

Size rank in cohort

Rank by radius

#1060of 1771

top 59.8%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-3362 b 12.80 R⊕ TOI-3682 b 12.80 R⊕ HD 29985 b 12.80 R⊕

Metric	Earth	NGTS-13 b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,538.30	317.83
Density (g/cm³)	5.51	4.02	1.33
Surface Gravity (g)	1.00	9.39	2.53
Insolation (S⊕)	1.00	1,096.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,538.297 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 454069765

Gaia DR2

Gaia DR2 5385076140853434752

Gaia DR3

Gaia DR3 5385076140853434752

System

NGTS-13

Percentile among Gas Giant cohort

Radius 12.801 R⊕ · percentile 40 / cohort 1771

Mass 1,538.297 M⊕ · percentile 74 / cohort 1747

Orbital period 4.12 d · percentile 30 / cohort 1533

Distance 647.60 pc · percentile 80 / cohort 1759

ESI 0.101 · percentile 27 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.119 days

Semi-major axis

0.0549 AU

Eccentricity

0.086

Inclination

88.70 °

Year Length

A year here lasts approximately 4.12 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0549 AU.

Transit Fingerprint

Depth

0.430 %

Duration

5.222 h

Impact parameter b

0.156

Transit midpoint (BJD)

2,458,572.8247

Photometric dip

Transit produces a flux drop of 4,300 ppm lasting ≈ 5.22 h.

Extended Orbital Architecture

Impact parameter (b)

0.156

RV semi-amplitude (K)

526.100 m/s

Transit mid-time (BJD)

2,458,572.8247

Long. of periastron (ω)

-146.40°

Angular separation (arcsec)

0.08480

Eq. Temperature

1,605K

(1332 °C)

Insolation (S⊕)

1,096.00

Earth = 1.00

Earth Similarity (ESI)

0.101

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

Grieves et al. 2021

Instrument

NGTS CCD array

Publication

2021-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Next-Generation Transit Survey (NGTS) (5 shown).

NGTS-14 A b · Neptune-like NGTS-15 b · Gas Giant NGTS-16 b · Gas Giant NGTS-17 b · Gas Giant NGTS-18 b · Gas Giant

Host System: NGTS-13

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,819 K — hotter than the Sun (5,778 K)

Estimated Age

4.23 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.788 R☉

Stellar Mass

1.300 M☉

Metallicity [Fe/H]

0.25

Extended Stellar Properties

Surface gravity (log g)

4.040 dex

Stellar density

0.310 g/cm³

Systemic radial velocity

29.35 km/s

Rotational v·sin i

6.20 km/s

Metallicity ratio

[Fe/H]

Distance

647.60 parsec

Light-years 2,112.17 ly

V-band magnitude

12.74 mag

Voyager-speed travel 37,248,115 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.516 mas

Total Proper Motion

21.149 mas/yr

PM Right Ascension

-21.13 mas/yr

PM Declination

-0.99 mas/yr

Galactic Cartesian (pc)

x = -0.785 · y = 0.052 · z = -0.618

Equatorial (J2000)

RA 176.24023° · Dec -38.13972°

Galactic ℓ, b

288.798° · 22.901°

Ecliptic λ, β

194.179° · -35.954°

HTM-20 index

-1772403024