Key parameters at a glance

A radius of 14.40 Earth radii
A mass of 117.91 Earth masses
Surface gravity around 0.57 g
An orbital period of 3.715 days
Semi-major axis 0.0474 AU
Equilibrium temperature 1,457 K (1184 °C)
Distance from Earth 918.12 light-years
Earth Similarity Index 0.071
Travel time at Voyager 1 speed 16,191,091 years

Qatar-8 b Planet Profile

Physical Specs

Radius

14.40 R⊕

Radius (Jupiter)

1.285 R♃

Mass

117.91 M⊕

Mass (Jupiter)

0.371 M♃

Density

0.22 g/cm³

Surface Gravity

0.57 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.071

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Transit

Facility Qatar

Telescope Canon 400mm f/2.8L

Size rank in cohort

Rank by radius

#291of 1771

top 16.4%

This planet

14.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-485 b 14.41 R⊕ HATS-45 b 14.41 R⊕ TOI-157 b 14.41 R⊕

Metric	Earth	Qatar-8 b	Jupiter
Radius (R⊕)	1.00	14.40	11.21
Mass (M⊕)	1.00	117.91	317.83
Density (g/cm³)	5.51	0.22	1.33
Surface Gravity (g)	1.00	0.57	2.53
Insolation (S⊕)	1.00	698.15	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	117.915 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 103751498

Gaia DR2

Gaia DR2 1076515002779544960

Gaia DR3

Gaia DR3 1076515002779544960

System

Qatar-8

Percentile among Gas Giant cohort

Radius 14.404 R⊕ · percentile 84 / cohort 1771

Mass 117.915 M⊕ · percentile 8 / cohort 1747

Orbital period 3.71 d · percentile 26 / cohort 1533

Distance 281.50 pc · percentile 58 / cohort 1759

ESI 0.071 · percentile 13 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.715 days

Semi-major axis

0.0474 AU

Eccentricity

0.000

Inclination

89.29 °

Year Length

A year here lasts approximately 3.71 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0474 AU.

Transit Fingerprint

Depth

1.262 %

Duration

4.027 h

Impact parameter b

0.096

Rp / R★

0.100500

Transit midpoint (BJD)

2,458,210.8398

Photometric dip

Transit produces a flux drop of 12,620 ppm lasting ≈ 4.03 h.

Extended Orbital Architecture

Planet / star radius ratio

0.100500

Semi-major axis / stellar radius

7.761

Impact parameter (b)

0.096

RV semi-amplitude (K)

47.700 m/s

Transit mid-time (BJD)

2,458,210.8398

Angular separation (arcsec)

0.16800

Eq. Temperature

1,457K

(1184 °C)

Insolation (S⊕)

698.15

Earth = 1.00

Earth Similarity (ESI)

0.071

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

Alsubai et al. 2019

Instrument

FLI ProLine 4K CCD Sensor

Publication

2019-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Qatar (3 shown).

Qatar-9 b · Gas Giant Qatar-7 b · Gas Giant Qatar-10 b · Gas Giant

Host System: Qatar-8

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,738 K — cooler than the Sun (5,778 K)

Estimated Age

8.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.315 R☉

Stellar Mass

1.029 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.214 dex

Stellar density

0.641 g/cm³

Systemic radial velocity

5.57 km/s

Rotational v·sin i

2.70 km/s

Metallicity ratio

[Fe/H]

Distance

281.50 parsec

Light-years 918.12 ly

V-band magnitude

11.71 mag

Voyager-speed travel 16,191,091 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

3.524 mas

Total Proper Motion

47.506 mas/yr

PM Right Ascension

-46.53 mas/yr

PM Declination

-9.60 mas/yr

Galactic Cartesian (pc)

x = -0.308 · y = 0.128 · z = 0.943

Equatorial (J2000)

RA 157.41234° · Dec 70.52708°

Galactic ℓ, b

138.058° · 42.191°

Ecliptic λ, β

122.000° · 54.495°

HTM-20 index

-1710489210