Confirmed Exoplanet Discovered 2022

pi Men d

A sub-neptune orbiting the g-type yellow (sun-like) HD 39091, located approximately 59.6 light-years from Earth.

Key parameters at a glance

  • A radius of 3.72 Earth radii
  • A mass of 13.38 Earth masses
  • Surface gravity around 0.97 g
  • An orbital period of 124.640 days
  • Semi-major axis 0.5060 AU
  • Distance from Earth 59.59 light-years
  • Earth Similarity Index 0.568
  • Travel time at Voyager 1 speed 1,050,858 years

2 siblings around HD 39091

pi Men d 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
pi Men c Sub-Neptune 2.02 3.63 6.268 1,170 2018
pi Men d this Sub-Neptune 3.72 13.38 124.640 — 2022
HD 39091 b Gas Giant 12.30 4,481.38 2,088.800 — 2001

pi Men d Planet Profile

Physical Specs

Radius
3.72 R⊕
Radius (Jupiter)
0.332 R♃
Mass
13.38 M⊕
Mass (Jupiter)
0.042 M♃
Density
1.43 g/cm³
Surface Gravity
0.97 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.568
HZ Position Unknown
Controversial No

Discovery

Year 2022
Method Radial Velocity
Facility La Silla Observatory
Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#81of 1978

top 4.0%

This planet

3.72R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-79 c 3.72 R⊕ Kepler-937 b 3.72 R⊕ K2-357 b 3.72 R⊕
Metric Earth pi Men d Jupiter
Radius (R⊕)1.003.7211.21
Mass (M⊕)1.0013.38317.83
Density (g/cm³)5.511.431.33
Surface Gravity (g)1.000.972.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Minimum mass (M sin i) 13.380 M⊕ Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD

HD 39091

HIP

HIP 26394

TIC

TIC 261136679

Gaia DR2

Gaia DR2 4623036865373793408

Gaia DR3

Gaia DR3 4623036865373793408

System

HD 39091

Percentile among Sub-Neptune cohort

Radius 3.720 R⊕ · percentile 96 / cohort 1978
Mass 13.380 M⊕ · percentile 89 / cohort 1978
Orbital period 124.64 d · percentile 95 / cohort 1946
Distance 18.27 pc · percentile 4 / cohort 1975
ESI 0.568 · percentile 79 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period
124.640 days
Semi-major axis
0.5060 AU
Eccentricity
0.220
Inclination
— °

Year Length

A year here lasts approximately 124.64 Earth days (34.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.5060 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

1.680 m/s

Transit mid-time (BJD)

2,455,218.6000

Long. of periastron (ω)

323.00°

Angular separation (arcsec)

27.70000

Eq. Temperature

—

 

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.568

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Hatzes et al. 2022

Instrument

HARPS Spectrograph

Publication

2022-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at La Silla Observatory (12 shown).

TOI-500 c · Sub-Neptune TOI-500 e · Sub-Neptune CoRoT-7 d · Neptune-like TOI-500 d · Neptune-like HD 69123 b · Gas Giant HD 103891 b · Gas Giant HD 114082 b · Gas Giant HD 64121 b · Gas Giant HD 22532 b · Gas Giant HD 29399 b · Gas Giant iot Dra c · Gas Giant HD 105779 b · Gas Giant

Host System: HD 39091

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,998 K — hotter than the Sun (5,778 K)

Estimated Age

3.92 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.190 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

0.945 g/cm³

Systemic radial velocity

10.71 km/s

Rotational v·sin i

3.34 km/s

Rotation period

18.30 days

Activity index (log R'HK)

-4.970

Metallicity ratio

[Fe/H]

Distance
18.27 parsec
Light-years 59.59 ly
V-band magnitude
5.65 mag
Voyager-speed travel 1,050,858 yr

Multi-band Host Photometry — 11 bands

4.06.36.25B5.65V5.51Gaia5.11TESS4.87J4.42H4.24K4.27W13.97W24.20W34.22W4

Astrometric Data

Parallax

54.705 mas

Total Proper Motion

1,094.030 mas/yr

PM Right Ascension

311.19 mas/yr

PM Declination

1,048.84 mas/yr

Galactic Cartesian (pc)

x = 0.016 · y = 0.165 · z = -0.986

Equatorial (J2000)

RA 84.29928° · Dec -80.46460°

Galactic ℓ, b

292.508° · -29.776°

Ecliptic λ, β

273.901° · -76.019°

HTM-20 index

1068394155

Observation Record

Photometric series

1

RV measurements

2

Stellar spectra

1

Archive notes

1

Similar Worlds

K2-357 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 3.72 R⊕ · 1,688.5 ly

Kepler-1065 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 3.73 R⊕ · 3,661.0 ly

Kepler-146 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 3.71 R⊕ · 2,337.9 ly

TOI-1136 f

Sub-Neptune · G-type yellow (Sun-like)

Radius 3.74 R⊕ · 275.7 ly

HD 191939 g

Sub-Neptune · G-type yellow (Sun-like)

Radius 3.74 R⊕ · 174.8 ly

Kepler-871 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 3.74 R⊕ · 6,445.0 ly

Explore Related Categories

Sub-Neptune Planets Radial Velocity Discoveries La Silla Observatory Mission G-type yellow (Sun-like) Hosts