Key parameters at a glance

A radius of 10.80 Earth radii
A mass of 81.09 Earth masses
Surface gravity around 0.70 g
An orbital period of 62.915 days
Semi-major axis 0.3098 AU
Distance from Earth 248.31 light-years
Earth Similarity Index 0.290
Travel time at Voyager 1 speed 4,379,017 years

DMPP-8 b Planet Profile

Physical Specs

Radius

10.80 R⊕

Radius (Jupiter)

0.960 R♃

Mass

81.09 M⊕

Mass (Jupiter)

0.255 M♃

Density

0.35 g/cm³

Surface Gravity

0.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.290

HZ Position Unknown

Controversial No

Discovery

Year 2026

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1686of 1771

top 95.1%

This planet

10.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-725 b 10.80 R⊕ GJ 649 b 10.80 R⊕ Kepler-419 b 10.80 R⊕

Metric	Earth	DMPP-8 b	Jupiter
Radius (R⊕)	1.00	10.80	11.21
Mass (M⊕)	1.00	81.09	317.83
Density (g/cm³)	5.51	0.35	1.33
Surface Gravity (g)	1.00	0.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	81.090 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 191122

HIP

HIP 100359

TIC

TIC 318042295

Gaia DR2

Gaia DR2 6349054822860923008

Gaia DR3

Gaia DR3 6349054822860923008

System

DMPP-8

Percentile among Gas Giant cohort

Radius 10.800 R⊕ · percentile 5 / cohort 1771

Mass 81.090 M⊕ · percentile 3 / cohort 1747

Orbital period 62.92 d · percentile 51 / cohort 1533

Distance 76.13 pc · percentile 30 / cohort 1759

ESI 0.290 · percentile 55 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

62.915 days

Semi-major axis

0.3098 AU

Eccentricity

0.275

Inclination

— °

Year Length

A year here lasts approximately 62.92 Earth days (17.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3098 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.290

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Standing et al. 2026

Instrument

Multiple Instruments

Publication

2026-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2026 at Multiple Observatories (12 shown).

DMPP-6 b · Sub-Neptune TOI-4336 A c · Super-Earth GJ 887 d · Sub-Neptune HD 176986 d · Sub-Neptune GJ 887 e · Rocky Terrestrial DMPP-6 c · Sub-Neptune DMPP-9 b · Sub-Neptune TOI-5789 d · Super-Earth TOI-5789 e · Sub-Neptune HD 85426 c · Sub-Neptune DMPP-2 c · Neptune-like DMPP-7 b · Neptune-like

Host System: DMPP-8

Spectral Class

F-type yellow-white

Effective Temperature

6,009 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.240 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.321 dex

Stellar density

0.893 g/cm³

Systemic radial velocity

12.53 km/s

Rotational v·sin i

2.13 km/s

Rotation period

24.20 days

Distance

76.13 parsec

Light-years 248.31 ly

V-band magnitude

8.65 mag

Voyager-speed travel 4,379,017 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

13.106 mas

Total Proper Motion

203.271 mas/yr

PM Right Ascension

107.55 mas/yr

PM Declination

-172.49 mas/yr

Galactic Cartesian (pc)

x = 0.084 · y = -0.119 · z = -0.989

Equatorial (J2000)

RA 305.30835° · Dec -81.61667°

Galactic ℓ, b

311.887° · -30.044°

Ecliptic λ, β

279.512° · -59.356°

HTM-20 index

1259970421