Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 171.48 Earth masses
Surface gravity around 0.85 g
An orbital period of 5.203 days
Semi-major axis 0.0664 AU
Equilibrium temperature 1,000 K (727 °C)
Distance from Earth 449.90 light-years
Earth Similarity Index 0.118
Travel time at Voyager 1 speed 7,933,979 years

2 siblings around DMPP-2

DMPP-2 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
DMPP-2 c	Neptune-like	8.26	51.79	3.168	—	2026
DMPP-2 b this	Gas Giant	14.20	171.48	5.203	1,000	2019
DMPP-2 d	Gas Giant	11.60	91.79	16.491	—	2026

DMPP-2 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.270 R♃

Mass

171.48 M⊕

Mass (Jupiter)

0.540 M♃

Density

0.33 g/cm³

Surface Gravity

0.85 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.118

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Multiple Facilities

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	DMPP-2 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	171.48	317.83
Density (g/cm³)	5.51	0.33	1.33
Surface Gravity (g)	1.00	0.85	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	171.480 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 11231

HIP

HIP 8501

TIC

TIC 32432767

Gaia DR2

Gaia DR2 5017319806652067072

Gaia DR3

Gaia DR3 5017319806652067072

System

DMPP-2

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 171.480 M⊕ · percentile 15 / cohort 1747

Orbital period 5.20 d · percentile 37 / cohort 1533

Distance 137.94 pc · percentile 42 / cohort 1759

ESI 0.118 · percentile 31 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5.203 days

Semi-major axis

0.0664 AU

Eccentricity

0.060

Inclination

— °

Year Length

A year here lasts approximately 5.20 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0664 AU.

Eq. Temperature

1,000K

(727 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.118

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Haswell et al. 2020

Instrument

Multiple Instruments

Publication

2019-12

Observation locale

Ground

Host System: DMPP-2

Spectral Class

F-type yellow-white

Effective Temperature

6,500 K — hotter than the Sun (5,778 K)

Estimated Age

2.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.780 R☉

Stellar Mass

1.410 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.100 dex

Stellar density

0.244 g/cm³

Systemic radial velocity

7.54 km/s

Rotational v·sin i

5.10 km/s

Distance

137.94 parsec

Light-years 449.90 ly

V-band magnitude

8.57 mag

Voyager-speed travel 7,933,979 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.221 mas

Total Proper Motion

28.417 mas/yr

PM Right Ascension

-27.38 mas/yr

PM Declination

7.61 mas/yr

Galactic Cartesian (pc)

x = 0.732 · y = 0.380 · z = -0.566

Equatorial (J2000)

RA 27.40773° · Dec -34.45910°

Galactic ℓ, b

246.923° · -75.534°

Ecliptic λ, β

9.547° · -42.075°

HTM-20 index

1639271914