Key parameters at a glance

A radius of 2.54 Earth radii
A mass of 11.32 Earth masses
Surface gravity around 1.75 g
An orbital period of 46.962 days
Semi-major axis 0.2500 AU
Equilibrium temperature 479 K (206 °C)
Distance from Earth 227.01 light-years
Earth Similarity Index 0.542
Travel time at Voyager 1 speed 4,003,375 years

1 sibling around HD 35843

HD 35843 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 35843 b	Sub-Neptune	2.29	5.84	9.899	—	2025
HD 35843 c this	Sub-Neptune	2.54	11.32	46.962	479	2025

HD 35843 c Planet Profile

Physical Specs

Radius

2.54 R⊕

Radius (Jupiter)

0.227 R♃

Mass

11.32 M⊕

Mass (Jupiter)

0.036 M♃

Density

3.80 g/cm³

Surface Gravity

1.75 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.542

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1117of 1978

top 56.4%

This planet

2.54R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1116 b 2.54 R⊕ Kepler-325 c 2.54 R⊕ HD 189567 c 2.54 R⊕

Metric	Earth	HD 35843 c	Jupiter
Radius (R⊕)	1.00	2.54	11.21
Mass (M⊕)	1.00	11.32	317.83
Density (g/cm³)	5.51	3.80	1.33
Surface Gravity (g)	1.00	1.75	2.53
Insolation (S⊕)	1.00	11.38	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	11.320 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 35843

HIP

HIP 25359

TIC

TIC 7422496

Gaia DR2

Gaia DR2 4799563663371481344

Gaia DR3

Gaia DR3 4799563663371481344

System

HD 35843

Percentile among Sub-Neptune cohort

Radius 2.540 R⊕ · percentile 43 / cohort 1978

Mass 11.320 M⊕ · percentile 82 / cohort 1978

Orbital period 46.96 d · percentile 84 / cohort 1946

Distance 69.60 pc · percentile 16 / cohort 1975

ESI 0.542 · percentile 76 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

46.962 days

Semi-major axis

0.2500 AU

Eccentricity

0.153

Inclination

89.58 °

Year Length

A year here lasts approximately 46.96 Earth days (12.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2500 AU.

Transit Fingerprint

Depth

0.076 %

Duration

5.800 h

Impact parameter b

0.470

Rp / R★

0.026000

Transit midpoint (BJD)

2,459,221.7562

Photometric dip

Transit produces a flux drop of 758 ppm lasting ≈ 5.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026000

Impact parameter (b)

0.470

RV semi-amplitude (K)

2.130 m/s

Transit mid-time (BJD)

2,459,221.7562

Long. of periastron (ω)

211.00°

Angular separation (arcsec)

3.59000

Eq. Temperature

479K

(206 °C)

Insolation (S⊕)

11.38

Earth = 1.00

Earth Similarity (ESI)

0.542

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — 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

Hesse et al. 2025

Instrument

TESS CCD Array

Publication

2025-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1266 d · Super-Earth TOI-2267 c · Rocky Terrestrial TOI-5799 c · Super-Earth TOI-5728 b · Super-Earth TOI-5716 b · Rocky Terrestrial TOI-7166 b · Sub-Neptune TOI-2267 b · Rocky Terrestrial TOI-2093 c · Sub-Neptune TOI-2267 d · Super-Earth TOI-5489 c · Super-Earth TOI-1743 b · Super-Earth TOI-4364 b · Sub-Neptune

Host System: HD 35843

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,666 K — cooler than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.897 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.27

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.840 g/cm³

Systemic radial velocity

13.77 km/s

Rotational v·sin i

2.09 km/s

Rotation period

25.49 days

Activity index (log R'HK)

-5.010

Metallicity ratio

[Fe/H]

Distance

69.60 parsec

Light-years 227.01 ly

V-band magnitude

9.36 mag

Voyager-speed travel 4,003,375 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

14.338 mas

Total Proper Motion

118.815 mas/yr

PM Right Ascension

-44.10 mas/yr

PM Declination

-110.33 mas/yr

Galactic Cartesian (pc)

x = 0.107 · y = 0.706 · z = -0.700

Equatorial (J2000)

RA 81.34889° · Dec -44.43128°

Galactic ℓ, b

250.098° · -33.521°

Ecliptic λ, β

73.777° · -67.384°

HTM-20 index

-1609434883