Key parameters at a glance

A radius of 16.48 Earth radii
A mass of 6,261.22 Earth masses
Surface gravity around 23.06 g
An orbital period of 1.745 days
Semi-major axis 0.0338 AU
Equilibrium temperature 2,300 K (2027 °C)
Distance from Earth 2,136.36 light-years
Earth Similarity Index 0.057
Travel time at Voyager 1 speed 37,674,781 years

GPX-1 b Planet Profile

Physical Specs

Radius

16.48 R⊕

Radius (Jupiter)

1.470 R♃

Mass

6,261.22 M⊕

Mass (Jupiter)

19.700 M♃

Density

8.22 g/cm³

Surface Gravity

23.06 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.057

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Acton Sky Portal Observatory

Telescope 279mm RASA-11 wide-field telescope

Size rank in cohort

Rank by radius

#133of 1771

top 7.5%

This planet

16.48R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-2295 b 16.48 R⊕ WASP-183 b 16.48 R⊕ TOI-3023 b 16.43 R⊕

Metric	Earth	GPX-1 b	Jupiter
Radius (R⊕)	1.00	16.48	11.21
Mass (M⊕)	1.00	6,261.22	317.83
Density (g/cm³)	5.51	8.22	1.33
Surface Gravity (g)	1.00	23.06	2.53
Insolation (S⊕)	1.00	4,650.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	6,261.220 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 245392284

Gaia DR2

Gaia DR2 457317534880081152

Gaia DR3

Gaia DR3 457317534880081152

System

GPX-1

Percentile among Gas Giant cohort

Radius 16.477 R⊕ · percentile 92 / cohort 1771

Mass 6,261.220 M⊕ · percentile 96 / cohort 1747

Orbital period 1.74 d · percentile 5 / cohort 1533

Distance 655.01 pc · percentile 80 / cohort 1759

ESI 0.057 · percentile 7 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1.745 days

Semi-major axis

0.0338 AU

Eccentricity

0.000

Inclination

79.90 °

Year Length

A year here lasts approximately 1.74 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0338 AU.

Transit Fingerprint

Depth

0.900 %

Duration

2.090 h

Impact parameter b

0.820

Rp / R★

0.095000

Transit midpoint (BJD)

2,458,770.2382

Photometric dip

Transit produces a flux drop of 9,000 ppm lasting ≈ 2.09 h.

Extended Orbital Architecture

Planet / star radius ratio

0.095000

Semi-major axis / stellar radius

4.670

Impact parameter (b)

0.820

RV semi-amplitude (K)

2,310.000 m/s

Occultation depth

0.100 ppm

Transit mid-time (BJD)

2,458,770.2382

Sky-projected obliquity (λ)

6.90°

Angular separation (arcsec)

0.05160

Eq. Temperature

2,300K

(2027 °C)

Insolation (S⊕)

4,650.00

Earth = 1.00

Earth Similarity (ESI)

0.057

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

Benni et al. 2021

Instrument

FLI ML16200 camera

Publication

2021-08

Observation locale

Ground

Host System: GPX-1

Spectral Class

F-type yellow-white

Effective Temperature

7,000 K — hotter than the Sun (5,778 K)

Estimated Age

0.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.560 R☉

Stellar Mass

1.680 M☉

Metallicity [Fe/H]

0.35

Extended Stellar Properties

Surface gravity (log g)

4.270 dex

Stellar density

0.620 g/cm³

Systemic radial velocity

-3.70 km/s

Rotational v·sin i

40.00 km/s

Metallicity ratio

[Fe/H]

Distance

655.01 parsec

Light-years 2,136.36 ly

V-band magnitude

12.32 mag

Voyager-speed travel 37,674,781 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

1.499 mas

Total Proper Motion

3.253 mas/yr

PM Right Ascension

-3.25 mas/yr

PM Declination

0.05 mas/yr

Galactic Cartesian (pc)

x = 0.438 · y = 0.347 · z = 0.829

Equatorial (J2000)

RA 38.36916° · Dec 56.02571°

Galactic ℓ, b

136.893° · -4.055°

Ecliptic λ, β

55.937° · 38.527°

HTM-20 index

-13257647