Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 194.83 Earth masses
Surface gravity around 0.97 g
An orbital period of 4.076 days
Semi-major axis 0.0504 AU
Equilibrium temperature 1,327 K (1054 °C)
Distance from Earth 3,506.01 light-years
Earth Similarity Index 0.088
Travel time at Voyager 1 speed 61,828,552 years

NGTS-23 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.267 R♃

Mass

194.83 M⊕

Mass (Jupiter)

0.613 M♃

Density

0.37 g/cm³

Surface Gravity

0.97 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.088

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Transit

Facility Next-Generation Transit Survey (NGTS)

Telescope 20 cm NGTS telescope

Size rank in cohort

Rank by radius

#332of 1771

top 18.7%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-2031 A b 14.20 R⊕ OGLE-2011-BLG-0251L b 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	NGTS-23 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	194.83	317.83
Density (g/cm³)	5.51	0.37	1.33
Surface Gravity (g)	1.00	0.97	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	194.829 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 77287067

Gaia DR2

Gaia DR2 4816462091938129408

Gaia DR3

Gaia DR3 4816462091938129408

System

NGTS-23

Percentile among Gas Giant cohort

Radius 14.202 R⊕ · percentile 81 / cohort 1771

Mass 194.829 M⊕ · percentile 19 / cohort 1747

Orbital period 4.08 d · percentile 30 / cohort 1533

Distance 1,074.95 pc · percentile 87 / cohort 1759

ESI 0.088 · percentile 22 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.076 days

Semi-major axis

0.0504 AU

Eccentricity

0.000

Inclination

89.12 °

Year Length

A year here lasts approximately 4.08 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0504 AU.

Transit Fingerprint

Duration

3.919 h

Impact parameter b

0.134

Rp / R★

0.104800

Transit midpoint (BJD)

2,458,431.7713

Extended Orbital Architecture

Planet / star radius ratio

0.104800

Semi-major axis / stellar radius

8.720

Impact parameter (b)

0.134

RV semi-amplitude (K)

78.000 m/s

Transit mid-time (BJD)

2,458,431.7713

Angular separation (arcsec)

0.04690

Eq. Temperature

1,327K

(1054 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.088

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Jackson et al. 2022

Instrument

NGTS CCD array

Publication

2022-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Next-Generation Transit Survey (NGTS) (3 shown).

NGTS-25 b · Gas Giant NGTS-21 b · Gas Giant NGTS-24 b · Gas Giant

Host System: NGTS-23

Spectral Class

F-type yellow-white

Effective Temperature

6,057 K — hotter than the Sun (5,778 K)

Estimated Age

6.39 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.240 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

-0.26

Extended Stellar Properties

Surface gravity (log g)

4.040 dex

Stellar density

0.755 g/cm³

Rotational v·sin i

1.46 km/s

Metallicity ratio

[Fe/H]

Distance

1,074.95 parsec

Light-years 3,506.01 ly

V-band magnitude

14.13 mag

Voyager-speed travel 61,828,552 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

0.901 mas

Total Proper Motion

12.336 mas/yr

PM Right Ascension

0.84 mas/yr

PM Declination

12.31 mas/yr

Galactic Cartesian (pc)

x = 0.256 · y = 0.721 · z = -0.643

Equatorial (J2000)

RA 70.43229° · Dec -40.04453°

Galactic ℓ, b

243.746° · -41.202°

Ecliptic λ, β

57.716° · -61.309°

HTM-20 index

-833081172