Key parameters at a glance

A radius of 11.40 Earth radii
A mass of 88.99 Earth masses
Surface gravity around 0.68 g
An orbital period of 273.690 days
Semi-major axis 0.8070 AU
Distance from Earth 333.56 light-years
Earth Similarity Index 0.280
Travel time at Voyager 1 speed 5,882,326 years

1 sibling around TOI-199

TOI-199 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
TOI-199 b	Neptune-like	9.08	54.03	104.854	476	2023
TOI-199 c this	Gas Giant	11.40	88.99	273.690	—	2023

TOI-199 c Planet Profile

Physical Specs

Radius

11.40 R⊕

Radius (Jupiter)

1.010 R♃

Mass

88.99 M⊕

Mass (Jupiter)

0.280 M♃

Density

0.33 g/cm³

Surface Gravity

0.68 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.280

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Transit Timing Variations

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1604of 1771

top 90.5%

This planet

11.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

KMT-2019-BLG-2974L b 11.40 R⊕ KMT-2016-BLG-1337L b 11.40 R⊕ TOI-3235 b 11.40 R⊕

Metric	Earth	TOI-199 c	Jupiter
Radius (R⊕)	1.00	11.40	11.21
Mass (M⊕)	1.00	88.99	317.83
Density (g/cm³)	5.51	0.33	1.33
Surface Gravity (g)	1.00	0.68	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	88.992 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 309792357

Gaia DR2

Gaia DR2 4762582895440787712

Gaia DR3

Gaia DR3 4762582895440787712

System

TOI-199

Percentile among Gas Giant cohort

Radius 11.400 R⊕ · percentile 9 / cohort 1771

Mass 88.992 M⊕ · percentile 4 / cohort 1747

Orbital period 273.69 d · percentile 60 / cohort 1533

Distance 102.27 pc · percentile 35 / cohort 1759

ESI 0.280 · percentile 52 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

273.690 days

Semi-major axis

0.8070 AU

Eccentricity

0.096

Inclination

90.00 °

Year Length

A year here lasts approximately 273.69 Earth days (74.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.8070 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.280

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Hobson et al. 2023

Instrument

Multiple Instruments

Publication

2023-09

Observation locale

Multiple Locales

Discovery cohort

Planets confirmed in 2023 at Multiple Observatories (12 shown).

AU Mic d · Rocky Terrestrial DMPP-4 b · Sub-Neptune HD 110067 g · Sub-Neptune GJ 806 c · Sub-Neptune HD 110067 f · Sub-Neptune HD 110067 e · Super-Earth TIC 279401253 c · Gas Giant HD 112570 b · Gas Giant HD 110067 d · Sub-Neptune HD 154391 b · Gas Giant HAT-P-2 c · Gas Giant HD 110067 b · Sub-Neptune

Host System: TOI-199

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,255 K — cooler than the Sun (5,778 K)

Estimated Age

0.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.936 M☉

Metallicity [Fe/H]

0.22

Extended Stellar Properties

Surface gravity (log g)

4.582 dex

Stellar density

2.390 g/cm³

Rotational v·sin i

0.50 km/s

Activity index (log R'HK)

-4.770

Metallicity ratio

[Fe/H]

Distance

102.27 parsec

Light-years 333.56 ly

V-band magnitude

10.70 mag

Voyager-speed travel 5,882,326 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

9.749 mas

Total Proper Motion

74.200 mas/yr

PM Right Ascension

45.70 mas/yr

PM Declination

58.45 mas/yr

Galactic Cartesian (pc)

x = 0.086 · y = 0.494 · z = -0.865

Equatorial (J2000)

RA 80.10587° · Dec -59.89543°

Galactic ℓ, b

268.766° · -34.550°

Ecliptic λ, β

51.720° · -82.002°

HTM-20 index

1232827602