Key parameters at a glance

A radius of 14.57 Earth radii
A mass of 211.99 Earth masses
Surface gravity around 1.00 g
An orbital period of 4.845 days
Semi-major axis 0.0523 AU
Equilibrium temperature 1,177 K (904 °C)
Distance from Earth 2,929.43 light-years
Earth Similarity Index 0.101
Travel time at Voyager 1 speed 51,660,474 years

NGTS-16 b Planet Profile

Physical Specs

Radius

14.57 R⊕

Radius (Jupiter)

1.300 R♃

Mass

211.99 M⊕

Mass (Jupiter)

0.667 M♃

Density

0.38 g/cm³

Surface Gravity

1.00 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

#278of 1771

top 15.6%

This planet

14.57R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-1107 b 14.57 R⊕ HATS-16 b 14.57 R⊕ WASP-135 b 14.57 R⊕

Metric	Earth	NGTS-16 b	Jupiter
Radius (R⊕)	1.00	14.57	11.21
Mass (M⊕)	1.00	211.99	317.83
Density (g/cm³)	5.51	0.38	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	480.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	211.992 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 166806344

Gaia DR2

Gaia DR2 4886825544715697792

Gaia DR3

Gaia DR3 4886825544715697792

System

NGTS-16

Percentile among Gas Giant cohort

Radius 14.572 R⊕ · percentile 84 / cohort 1771

Mass 211.992 M⊕ · percentile 22 / cohort 1747

Orbital period 4.85 d · percentile 35 / cohort 1533

Distance 898.17 pc · percentile 85 / cohort 1759

ESI 0.101 · percentile 27 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.845 days

Semi-major axis

0.0523 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 4.85 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0523 AU.

Transit Fingerprint

Duration

3.061 h

Impact parameter b

0.807

Rp / R★

0.110000

Transit midpoint (BJD)

2,458,435.6054

Extended Orbital Architecture

Planet / star radius ratio

0.110000

Semi-major axis / stellar radius

9.290

Impact parameter (b)

0.807

RV semi-amplitude (K)

74.000 m/s

Transit mid-time (BJD)

2,458,435.6054

Angular separation (arcsec)

0.05820

Eq. Temperature

1,177K

(904 °C)

Insolation (S⊕)

480.00

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

Tilbrook 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-13 b · Gas Giant NGTS-17 b · Gas Giant NGTS-18 b · Gas Giant

Host System: NGTS-16

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,550 K — cooler than the Sun (5,778 K)

Estimated Age

10.29 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.213 R☉

Stellar Mass

1.002 M☉

Metallicity [Fe/H]

0.35

Extended Stellar Properties

Surface gravity (log g)

4.350 dex

Stellar density

0.676 g/cm³

Systemic radial velocity

29.13 km/s

Rotational v·sin i

2.50 km/s

Metallicity ratio

[Fe/H]

Distance

898.17 parsec

Light-years 2,929.43 ly

V-band magnitude

14.53 mag

Voyager-speed travel 51,660,474 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

1.084 mas

Total Proper Motion

10.832 mas/yr

PM Right Ascension

9.77 mas/yr

PM Declination

-4.67 mas/yr

Galactic Cartesian (pc)

x = 0.452 · y = 0.730 · z = -0.512

Equatorial (J2000)

RA 58.26393° · Dec -30.80464°

Galactic ℓ, b

229.400° · -50.373°

Ecliptic λ, β

45.914° · -49.502°

HTM-20 index

2054854051