Key parameters at a glance

A radius of 8.47 Earth radii
A mass of 91.22 Earth masses
Surface gravity around 1.27 g
An orbital period of 8.804 days
Semi-major axis 0.0822 AU
Equilibrium temperature 940 K (667 °C)
Distance from Earth 803.50 light-years
Earth Similarity Index 0.170
Travel time at Voyager 1 speed 14,169,635 years

1 sibling around WASP-148

WASP-148 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
WASP-148 b this	Neptune-like	8.47	91.22	8.804	940	2020
WASP-148 c	Gas Giant	13.90	124.59	34.524	590	2020

WASP-148 b Planet Profile

Physical Specs

Radius

8.47 R⊕

Radius (Jupiter)

0.756 R♃

Mass

91.22 M⊕

Mass (Jupiter)

0.287 M♃

Density

0.83 g/cm³

Surface Gravity

1.27 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.170

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility SuperWASP-North

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#123of 574

top 21.3%

This planet

8.47R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-6448 b 8.47 R⊕ HD 102117 b 8.47 R⊕ Kepler-16 b 8.45 R⊕

Metric	Earth	WASP-148 b	Jupiter
Radius (R⊕)	1.00	8.47	11.21
Mass (M⊕)	1.00	91.22	317.83
Density (g/cm³)	5.51	0.83	1.33
Surface Gravity (g)	1.00	1.27	2.53
Insolation (S⊕)	1.00	72.70	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	91.217 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	92.489 M⊕	Lower bound from radial-velocity fitting.
Computed mass	92.489 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

TIC

TIC 115524421

Gaia DR2

Gaia DR2 1358355738906114816

Gaia DR3

Gaia DR3 1358355738906114816

System

WASP-148

Percentile among Neptune-like cohort

Radius 8.474 R⊕ · percentile 78 / cohort 574

Mass 91.217 M⊕ · percentile 90 / cohort 574

Orbital period 8.80 d · percentile 34 / cohort 524

Distance 246.35 pc · percentile 43 / cohort 572

ESI 0.170 · percentile 20 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

8.804 days

Semi-major axis

0.0822 AU

Eccentricity

0.208

Inclination

89.30 °

Year Length

A year here lasts approximately 8.80 Earth days (2.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0822 AU.

Transit Fingerprint

Depth

0.836 %

Duration

3.016 h

Impact parameter b

0.199

Rp / R★

0.084980

Transit midpoint (BJD)

2,457,957.4876

Photometric dip

Transit produces a flux drop of 8,360 ppm lasting ≈ 3.02 h.

Extended Orbital Architecture

Planet / star radius ratio

0.084980

Semi-major axis / stellar radius

19.330

Impact parameter (b)

0.199

RV semi-amplitude (K)

30.100 m/s

Transit mid-time (BJD)

2,457,957.4876

Long. of periastron (ω)

60.60°

Sky-projected obliquity (λ)

-2.00°

True obliquity (ψ)

21.00°

Angular separation (arcsec)

0.33300

Eq. Temperature

940K

(667 °C)

Insolation (S⊕)

72.70

Earth = 1.00

Earth Similarity (ESI)

0.170

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

H Eacute Brard et al. 2020

Instrument

Andor e2v CCD Camera

Publication

2020-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2020 at SuperWASP-North (2 shown).

WASP-150 b · Gas Giant WASP-176 b · Gas Giant

Host System: WASP-148

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,555 K — cooler than the Sun (5,778 K)

Estimated Age

3.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.912 R☉

Stellar Mass

0.954 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.496 dex

Stellar density

1.760 g/cm³

Systemic radial velocity

-5.62 km/s

Rotational v·sin i

2.00 km/s

Rotation period

26.20 days

Metallicity ratio

[Fe/H]

Distance

246.35 parsec

Light-years 803.50 ly

V-band magnitude

12.04 mag

Voyager-speed travel 14,169,635 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

4.030 mas

Total Proper Motion

30.231 mas/yr

PM Right Ascension

-13.48 mas/yr

PM Declination

-27.06 mas/yr

Galactic Cartesian (pc)

x = -0.196 · y = -0.688 · z = 0.698

Equatorial (J2000)

RA 254.13050° · Dec 44.30254°

Galactic ℓ, b

69.454° · 38.655°

Ecliptic λ, β

241.045° · 66.154°

HTM-20 index

158085657