Key parameters at a glance

A radius of 13.00 Earth radii
A mass of 1,144.18 Earth masses
Surface gravity around 6.77 g
An orbital period of 25.200 days
Semi-major axis 0.1700 AU
Distance from Earth 515.32 light-years
Earth Similarity Index 0.411
Travel time at Voyager 1 speed 9,087,667 years
Almost certainly tidally locked to its host star given the close orbit

CI Tau c Planet Profile

Physical Specs

Radius

13.00 R⊕

Radius (Jupiter)

1.160 R♃

Mass

1,144.18 M⊕

Mass (Jupiter)

3.600 M♃

Density

2.86 g/cm³

Surface Gravity

6.77 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.411

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#960of 1771

top 54.2%

This planet

13.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 14810 b 13.00 R⊕ HD 47186 c 13.00 R⊕ WASP-107 c 13.00 R⊕

Metric	Earth	CI Tau c	Jupiter
Radius (R⊕)	1.00	13.00	11.21
Mass (M⊕)	1.00	1,144.18	317.83
Density (g/cm³)	5.51	2.86	1.33
Surface Gravity (g)	1.00	6.77	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1,144.182 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 61230756

Gaia DR2

Gaia DR2 145203159127518336

Gaia DR3

Gaia DR3 145203159127518336

System

CI Tau

Percentile among Gas Giant cohort

Radius 13.000 R⊕ · percentile 43 / cohort 1771

Mass 1,144.182 M⊕ · percentile 69 / cohort 1747

Orbital period 25.20 d · percentile 48 / cohort 1533

Distance 158.00 pc · percentile 45 / cohort 1759

ESI 0.411 · percentile 88 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

25.200 days

Semi-major axis

0.1700 AU

Eccentricity

0.580

Inclination

— °

Year Length

A year here lasts approximately 25.20 Earth days (6.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.411

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Manick et al. 2024

Instrument

Multiple Instruments

Publication

2024-03

Observation locale

Multiple Locales

Discovery cohort

Planets confirmed in 2024 at Multiple Observatories (12 shown).

HD 134606 e · Super-Earth Kepler-51 e · Sub-Neptune HD 134606 f · Sub-Neptune HD 134606 b · Sub-Neptune Teegarden's Star d · Rocky Terrestrial HD 134606 c · Sub-Neptune HD 104067 c · Sub-Neptune GJ 1289 b · Sub-Neptune TOI-4562 c · Gas Giant HD 222237 b · Gas Giant HD 75898 c · Gas Giant GJ 900 b · Gas Giant

Host System: CI Tau

Spectral Class

K-type orange

Effective Temperature

3,807 K — cooler than the Sun (5,778 K)

Estimated Age

0.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.881 R☉

Stellar Mass

0.900 M☉

Metallicity [Fe/H]

—

Distance

158.00 parsec

Light-years 515.32 ly

V-band magnitude

13.64 mag

Voyager-speed travel 9,087,667 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

6.301 mas

Total Proper Motion

19.250 mas/yr

PM Right Ascension

8.90 mas/yr

PM Declination

-17.07 mas/yr

Galactic Cartesian (pc)

x = 0.338 · y = 0.857 · z = 0.388

Equatorial (J2000)

RA 68.46677° · Dec 22.84162°

Galactic ℓ, b

175.464° · -16.636°

Ecliptic λ, β

70.223° · 0.868°

HTM-20 index

-1269788764

Similar Worlds

WASP-107 c

Gas Giant · K-type orange

Radius 13.00 R⊕ · 211.2 ly

HD 1605 c

Gas Giant · K-type orange

Radius 13.00 R⊕ · 289.6 ly

HD 86950 b

Gas Giant · K-type orange

Radius 13.00 R⊕ · 684.4 ly

HD 174205 b

Gas Giant · K-type orange

Radius 13.00 R⊕ · 763.3 ly

HD 95872 b

Gas Giant · K-type orange

Radius 13.00 R⊕ · 235.5 ly

MOA-2008-BLG-379L b

Gas Giant · K-type orange

Radius 13.00 R⊕ · 10,763.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts