Key parameters at a glance

A radius of 3.12 Earth radii
A mass of 18.40 Earth masses
Surface gravity around 1.89 g
An orbital period of 3.645 days
Semi-major axis 0.0473 AU
Equilibrium temperature 1,212 K (939 °C)
Distance from Earth 268.57 light-years
Earth Similarity Index 0.200
Travel time at Voyager 1 speed 4,736,184 years

1 sibling around HD 93963 A

HD 93963 A 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 93963 A b	Super-Earth	1.47	2.80	1.038	1,842	2022
HD 93963 A c this	Sub-Neptune	3.12	18.40	3.645	1,212	2022

HD 93963 A c Planet Profile

Physical Specs

Radius

3.12 R⊕

Radius (Jupiter)

0.278 R♃

Mass

18.40 M⊕

Mass (Jupiter)

0.058 M♃

Density

3.31 g/cm³

Surface Gravity

1.89 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.200

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#423of 1978

top 21.3%

This planet

3.12R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-224 c 3.12 R⊕ Kepler-150 e 3.12 R⊕ Kepler-11 d 3.12 R⊕

Metric	Earth	HD 93963 A c	Jupiter
Radius (R⊕)	1.00	3.12	11.21
Mass (M⊕)	1.00	18.40	317.83
Density (g/cm³)	5.51	3.31	1.33
Surface Gravity (g)	1.00	1.89	2.53
Insolation (S⊕)	1.00	543.80	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	18.400 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 93963 A

TIC

TIC 368435330

Gaia DR2

Gaia DR2 729899906357408768

Gaia DR3

Gaia DR3 729899906357408768

System

HD 93963

Percentile among Sub-Neptune cohort

Radius 3.120 R⊕ · percentile 79 / cohort 1978

Mass 18.400 M⊕ · percentile 94 / cohort 1978

Orbital period 3.65 d · percentile 7 / cohort 1946

Distance 82.34 pc · percentile 18 / cohort 1975

ESI 0.200 · percentile 7 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.645 days

Semi-major axis

0.0473 AU

Eccentricity

0.000

Inclination

86.31 °

Year Length

A year here lasts approximately 3.65 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0473 AU.

Transit Fingerprint

Depth

0.078 %

Duration

2.364 h

Impact parameter b

0.492

Rp / R★

0.027739

Transit midpoint (BJD)

2,458,902.8740

Photometric dip

Transit produces a flux drop of 780 ppm lasting ≈ 2.36 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027739

Semi-major axis / stellar radius

9.920

Impact parameter (b)

0.492

RV semi-amplitude (K)

7.200 m/s

Transit mid-time (BJD)

2,458,902.8740

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.57400

Eq. Temperature

1,212K

(939 °C)

Insolation (S⊕)

543.80

Earth = 1.00

Earth Similarity (ESI)

0.200

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Serrano et al. 2022

Instrument

TESS CCD Array

Publication

2022-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1452 b · Super-Earth TOI-712 d · Sub-Neptune TOI-1468 c · Sub-Neptune TOI-2136 b · Sub-Neptune LTT 1445 A c · Rocky Terrestrial TOI-712 c · Sub-Neptune LP 890-9 b · Super-Earth TOI-2081 b · Sub-Neptune GJ 3929 b · Rocky Terrestrial HD 260655 c · Super-Earth HD 73583 c · Sub-Neptune TOI-1759 b · Sub-Neptune

Host System: HD 93963 A

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,908 K — hotter than the Sun (5,778 K)

Estimated Age

1.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.031 R☉

Stellar Mass

1.084 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.445 dex

Stellar density

1.384 g/cm³

Systemic radial velocity

13.28 km/s

Rotational v·sin i

5.90 km/s

Rotation period

12.80 days

Activity index (log R'HK)

-4.630

Metallicity ratio

[Fe/H]

Distance

82.34 parsec

Light-years 268.57 ly

V-band magnitude

9.18 mag

Voyager-speed travel 4,736,184 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.116 mas

Total Proper Motion

95.698 mas/yr

PM Right Ascension

-92.84 mas/yr

PM Declination

-23.22 mas/yr

Galactic Cartesian (pc)

x = -0.861 · y = 0.267 · z = 0.433

Equatorial (J2000)

RA 162.77670° · Dec 25.64107°

Galactic ℓ, b

209.207° · 63.074°

Ecliptic λ, β

154.155° · 16.908°

HTM-20 index

-1419707580