Key parameters at a glance

A radius of 3.41 Earth radii
A mass of 9.10 Earth masses
Surface gravity around 0.78 g
An orbital period of 13.631 days
Semi-major axis 0.1110 AU
Equilibrium temperature 716 K (443 °C)
Distance from Earth 222.41 light-years
Earth Similarity Index 0.303
Travel time at Voyager 1 speed 3,922,241 years

2 siblings around TOI-469

TOI-469.01 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
HIP 29442 c	Super-Earth	1.55	4.50	3.538	1,123	2023
HIP 29442 d	Super-Earth	1.54	5.14	6.430	920	2023
TOI-469.01 this	Sub-Neptune	3.41	9.10	13.631	716	2021

TOI-469.01 Planet Profile

Physical Specs

Radius

3.41 R⊕

Radius (Jupiter)

0.304 R♃

Mass

9.10 M⊕

Mass (Jupiter)

0.029 M♃

Density

1.30 g/cm³

Surface Gravity

0.78 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.303

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#213of 1978

top 10.7%

This planet

3.41R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-711 b 3.41 R⊕ HD 191939 b 3.41 R⊕ Kepler-159 c 3.41 R⊕

Metric	Earth	TOI-469.01	Jupiter
Radius (R⊕)	1.00	3.41	11.21
Mass (M⊕)	1.00	9.10	317.83
Density (g/cm³)	5.51	1.30	1.33
Surface Gravity (g)	1.00	0.78	2.53
Insolation (S⊕)	1.00	74.70	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.100 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 42813

HIP

HIP 29442

TIC

TIC 33692729

Gaia DR2

Gaia DR2 2993561629444856960

Gaia DR3

Gaia DR3 2993561629444856960

System

TOI-469

Percentile among Sub-Neptune cohort

Radius 3.410 R⊕ · percentile 89 / cohort 1978

Mass 9.100 M⊕ · percentile 66 / cohort 1978

Orbital period 13.63 d · percentile 46 / cohort 1946

Distance 68.19 pc · percentile 15 / cohort 1975

ESI 0.303 · percentile 28 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.631 days

Semi-major axis

0.1110 AU

Eccentricity

0.000

Inclination

89.30 °

Year Length

A year here lasts approximately 13.63 Earth days (3.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1110 AU.

Transit Fingerprint

Depth

0.118 %

Duration

4.327 h

Impact parameter b

0.273

Rp / R★

0.031950

Transit midpoint (BJD)

2,458,474.5693

Photometric dip

Transit produces a flux drop of 1,179 ppm lasting ≈ 4.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031950

Semi-major axis / stellar radius

23.880

Impact parameter (b)

0.273

RV semi-amplitude (K)

2.630 m/s

Transit mid-time (BJD)

2,458,474.5693

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

1.63000

Eq. Temperature

716K

(443 °C)

Insolation (S⊕)

74.70

Earth = 1.00

Earth Similarity (ESI)

0.303

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

Giacalone et al. 2021

Instrument

TESS CCD Array

Publication

2021-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2257 b · Sub-Neptune TOI-2285 b · Super-Earth TOI-1231 b · Sub-Neptune AU Mic c · Sub-Neptune LHS 1678 c · Rocky Terrestrial LHS 1478 b · Rocky Terrestrial TOI-2406 b · Sub-Neptune HD 207897 b · Sub-Neptune TOI-269 b · Sub-Neptune TIC 172900988 b · Gas Giant TOI-178 g · Sub-Neptune TOI-2076 d · Sub-Neptune

Host System: TOI-469

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,289 K — cooler than the Sun (5,778 K)

Estimated Age

11.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.980 R☉

Stellar Mass

0.901 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.424 g/cm³

Rotational v·sin i

1.94 km/s

Rotation period

40.00 days

Activity index (log R'HK)

-4.980

Metallicity ratio

[Fe/H]

Distance

68.19 parsec

Light-years 222.41 ly

V-band magnitude

9.49 mag

Voyager-speed travel 3,922,241 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

14.636 mas

Total Proper Motion

180.981 mas/yr

PM Right Ascension

-79.26 mas/yr

PM Declination

162.70 mas/yr

Galactic Cartesian (pc)

x = -0.052 · y = 0.966 · z = -0.253

Equatorial (J2000)

RA 93.05784° · Dec -14.64932°

Galactic ℓ, b

221.872° · -15.183°

Ecliptic λ, β

93.754° · -38.049°

HTM-20 index

-505793275