Key parameters at a glance

A radius of 2.87 Earth radii
A mass of 16.90 Earth masses
Surface gravity around 2.05 g
An orbital period of 9.140 days
Semi-major axis 0.0910 AU
Equilibrium temperature 1,135 K (862 °C)
Distance from Earth 423.36 light-years
Earth Similarity Index 0.223
Travel time at Voyager 1 speed 7,466,016 years

1 sibling around TOI-1052

TOI-1052 b 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
TOI-1052 b this	Sub-Neptune	2.87	16.90	9.140	1,135	2023
TOI-1052 c	Neptune-like	6.48	34.30	35.806	719	2023

TOI-1052 b Planet Profile

Physical Specs

Radius

2.87 R⊕

Radius (Jupiter)

0.256 R♃

Mass

16.90 M⊕

Mass (Jupiter)

0.053 M♃

Density

3.93 g/cm³

Surface Gravity

2.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.223

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#659of 1978

top 33.3%

This planet

2.87R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-297 b 2.87 R⊕ Kepler-880 c 2.87 R⊕ Kepler-11 c 2.87 R⊕

Metric	Earth	TOI-1052 b	Jupiter
Radius (R⊕)	1.00	2.87	11.21
Mass (M⊕)	1.00	16.90	317.83
Density (g/cm³)	5.51	3.93	1.33
Surface Gravity (g)	1.00	2.05	2.53
Insolation (S⊕)	1.00	246.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	16.900 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 212729

TIC

TIC 317060587

Gaia DR2

Gaia DR2 6357524189130820992

Gaia DR3

Gaia DR3 6357524189130820992

System

TOI-1052

Percentile among Sub-Neptune cohort

Radius 2.870 R⊕ · percentile 66 / cohort 1978

Mass 16.900 M⊕ · percentile 94 / cohort 1978

Orbital period 9.14 d · percentile 30 / cohort 1946

Distance 129.80 pc · percentile 24 / cohort 1975

ESI 0.223 · percentile 10 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.140 days

Semi-major axis

0.0910 AU

Eccentricity

0.180

Inclination

87.53 °

Year Length

A year here lasts approximately 9.14 Earth days (2.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0910 AU.

Transit Fingerprint

Depth

0.036 %

Duration

3.091 h

Impact parameter b

0.808

Rp / R★

0.019400

Transit midpoint (BJD)

2,458,332.9442

Photometric dip

Transit produces a flux drop of 358 ppm lasting ≈ 3.09 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019400

Semi-major axis / stellar radius

15.510

Impact parameter (b)

0.808

RV semi-amplitude (K)

4.700 m/s

Transit mid-time (BJD)

2,458,332.9442

Long. of periastron (ω)

-119.00°

Angular separation (arcsec)

0.70100

Eq. Temperature

1,135K

(862 °C)

Insolation (S⊕)

246.00

Earth = 1.00

Earth Similarity (ESI)

0.223

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

Armstrong et al. 2023

Instrument

TESS CCD Array

Publication

2023-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-700 e · Rocky Terrestrial TOI-2095 c · Super-Earth TOI-715 b · Super-Earth TOI-2095 b · Super-Earth TOI-2096 c · Super-Earth TOI-1680 b · Super-Earth TOI-2096 b · Rocky Terrestrial TOI-904 c · Sub-Neptune TOI-1470 c · Sub-Neptune TOI-198 b · Super-Earth TOI-244 b · Super-Earth TOI-4184 b · Sub-Neptune

Host System: TOI-1052

Spectral Class

F-type yellow-white

Effective Temperature

6,146 K — hotter than the Sun (5,778 K)

Estimated Age

2.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.264 R☉

Stellar Mass

1.204 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.300 dex

Stellar density

0.494 g/cm³

Systemic radial velocity

54.95 km/s

Rotational v·sin i

5.00 km/s

Rotation period

12.80 days

Activity index (log R'HK)

-5.320

Metallicity ratio

[Fe/H]

Distance

129.80 parsec

Light-years 423.36 ly

V-band magnitude

9.51 mag

Voyager-speed travel 7,466,016 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.675 mas

Total Proper Motion

63.357 mas/yr

PM Right Ascension

-63.33 mas/yr

PM Declination

-1.94 mas/yr

Galactic Cartesian (pc)

x = 0.229 · y = -0.095 · z = -0.969

Equatorial (J2000)

RA 337.51027° · Dec -75.64656°

Galactic ℓ, b

313.483° · -38.441°

Ecliptic λ, β

295.865° · -58.334°

HTM-20 index

666738892