Key parameters at a glance

A radius of 3.53 Earth radii
A mass of 12.20 Earth masses
Surface gravity around 0.98 g
An orbital period of 3.498 days
Semi-major axis 0.0485 AU
Distance from Earth 82.61 light-years
Earth Similarity Index 0.584
Travel time at Voyager 1 speed 1,456,829 years

DMPP-4 b Planet Profile

Physical Specs

Radius

3.53 R⊕

Radius (Jupiter)

0.315 R♃

Mass

12.20 M⊕

Mass (Jupiter)

0.038 M♃

Density

1.52 g/cm³

Surface Gravity

0.98 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.584

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#164of 1978

top 8.2%

This planet

3.53R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-359 b 3.53 R⊕ K2-285 c 3.53 R⊕ Kepler-1038 b 3.53 R⊕

Metric	Earth	DMPP-4 b	Jupiter
Radius (R⊕)	1.00	3.53	11.21
Mass (M⊕)	1.00	12.20	317.83
Density (g/cm³)	5.51	1.52	1.33
Surface Gravity (g)	1.00	0.98	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	12.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 184960

HIP

HIP 96258

TIC

TIC 26884478

Gaia DR2

Gaia DR2 2136027771930903808

Gaia DR3

Gaia DR3 2136027771930903808

System

DMPP-4

Percentile among Sub-Neptune cohort

Radius 3.530 R⊕ · percentile 92 / cohort 1978

Mass 12.200 M⊕ · percentile 84 / cohort 1978

Orbital period 3.50 d · percentile 6 / cohort 1946

Distance 25.33 pc · percentile 6 / cohort 1975

ESI 0.584 · percentile 81 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.498 days

Semi-major axis

0.0485 AU

Eccentricity

0.063

Inclination

— °

Year Length

A year here lasts approximately 3.50 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0485 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

4.430 m/s

Transit mid-time (BJD)

2,457,139.9000

Long. of periastron (ω)

200.00°

Angular separation (arcsec)

1.92000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.584

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Barnes et al. 2023

Instrument

Multiple Instruments

Publication

2023-10

Observation locale

Multiple Locales

Discovery cohort

Planets confirmed in 2023 at Multiple Observatories (12 shown).

AU Mic d · Rocky Terrestrial HD 110067 g · Sub-Neptune GJ 806 c · Sub-Neptune HD 110067 f · Sub-Neptune HD 110067 e · Super-Earth TIC 279401253 c · Gas Giant HD 112570 b · Gas Giant HD 110067 d · Sub-Neptune HD 154391 b · Gas Giant HAT-P-2 c · Gas Giant HD 110067 b · Sub-Neptune HD 110067 c · Sub-Neptune

Host System: DMPP-4

Spectral Class

F-type yellow-white

Effective Temperature

6,400 K — hotter than the Sun (5,778 K)

Estimated Age

2.15 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.380 R☉

Stellar Mass

1.250 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.240 dex

Stellar density

0.641 g/cm³

Systemic radial velocity

0.60 km/s

Rotational v·sin i

7.50 km/s

Activity index (log R'HK)

-5.240

Metallicity ratio

[Fe/H]

Distance

25.33 parsec

Light-years 82.61 ly

V-band magnitude

5.73 mag

Voyager-speed travel 1,456,829 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

39.453 mas

Total Proper Motion

190.979 mas/yr

PM Right Ascension

30.20 mas/yr

PM Declination

-188.58 mas/yr

Galactic Cartesian (pc)

x = 0.250 · y = -0.574 · z = 0.780

Equatorial (J2000)

RA 293.58266° · Dec 51.23581°

Galactic ℓ, b

83.462° · 14.588°

Ecliptic λ, β

319.183° · 70.673°

HTM-20 index

1038399158