Key parameters at a glance

A radius of 2.49 Earth radii
A mass of 17.20 Earth masses
Surface gravity around 2.77 g
An orbital period of 146.050 days
Semi-major axis 0.5800 AU
Equilibrium temperature 460 K (187 °C)
Distance from Earth 108.50 light-years
Earth Similarity Index 0.570
Travel time at Voyager 1 speed 1,913,456 years

HD 88986 b Planet Profile

Physical Specs

Radius

2.49 R⊕

Radius (Jupiter)

0.222 R♃

Mass

17.20 M⊕

Mass (Jupiter)

0.054 M♃

Density

6.10 g/cm³

Surface Gravity

2.77 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.570

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#1191of 1978

top 60.2%

This planet

2.49R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-184 d 2.49 R⊕ HD 176986 d 2.49 R⊕ Kepler-11 f 2.49 R⊕

Metric	Earth	HD 88986 b	Jupiter
Radius (R⊕)	1.00	2.49	11.21
Mass (M⊕)	1.00	17.20	317.83
Density (g/cm³)	5.51	6.10	1.33
Surface Gravity (g)	1.00	2.77	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	17.200 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 88986

HIP

HIP 50316

TIC

TIC 1042868

Gaia DR2

Gaia DR2 741184091114529792

Gaia DR3

Gaia DR3 741184091114529792

System

HD 88986

Percentile among Sub-Neptune cohort

Radius 2.490 R⊕ · percentile 39 / cohort 1978

Mass 17.200 M⊕ · percentile 94 / cohort 1978

Orbital period 146.05 d · percentile 96 / cohort 1946

Distance 33.27 pc · percentile 8 / cohort 1975

ESI 0.570 · percentile 79 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

146.050 days

Semi-major axis

0.5800 AU

Eccentricity

0.240

Inclination

89.90 °

Year Length

A year here lasts approximately 146.05 Earth days (40.0% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.5800 AU.

Transit Fingerprint

Impact parameter b

0.210

Rp / R★

0.014800

Transit midpoint (BJD)

2,458,891.6900

Extended Orbital Architecture

Planet / star radius ratio

0.014800

Semi-major axis / stellar radius

81.100

Impact parameter (b)

0.210

RV semi-amplitude (K)

1.850 m/s

Transit mid-time (BJD)

2,458,891.6900

Long. of periastron (ω)

306.00°

Angular separation (arcsec)

17.40000

Eq. Temperature

460K

(187 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.570

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

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

Heidari et al. 2023

Instrument

SOPHIE Spectrograph

Publication

2023-11

Observation locale

Ground

Host System: HD 88986

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,861 K — hotter than the Sun (5,778 K)

Estimated Age

7.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.543 R☉

Stellar Mass

1.250 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.160 dex

Stellar density

0.472 g/cm³

Rotational v·sin i

3.30 km/s

Rotation period

25.00 days

Activity index (log R'HK)

-5.040

Metallicity ratio

[Fe/H]

Distance

33.27 parsec

Light-years 108.50 ly

V-band magnitude

6.47 mag

Voyager-speed travel 1,913,456 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

30.031 mas

Total Proper Motion

115.924 mas/yr

PM Right Ascension

-65.69 mas/yr

PM Declination

-95.51 mas/yr

Galactic Cartesian (pc)

x = -0.789 · y = 0.383 · z = 0.480

Equatorial (J2000)

RA 154.11669° · Dec 28.68207°

Galactic ℓ, b

201.088° · 55.877°

Ecliptic λ, β

145.505° · 16.739°

HTM-20 index

-2408646