Key parameters at a glance

A radius of 14.30 Earth radii
A mass of 147.00 Earth masses
Surface gravity around 0.72 g
An orbital period of 159.900 days
Semi-major axis 0.6100 AU
Distance from Earth 1,084.95 light-years
Earth Similarity Index 0.247
Travel time at Voyager 1 speed 19,133,117 years

1 sibling around TOI-1294

TOI-1294 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-1294 b	Gas Giant	10.12	63.90	3.915	1,393	2024
TOI-1294 c this	Gas Giant	14.30	147.00	159.900	—	2024

TOI-1294 c Planet Profile

Physical Specs

Radius

14.30 R⊕

Radius (Jupiter)

1.270 R♃

Mass

147.00 M⊕

Mass (Jupiter)

0.463 M♃

Density

0.28 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.247

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#301of 1771

top 16.9%

This planet

14.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 65407 b 14.30 R⊕ HD 30669 b 14.30 R⊕ HD 45652 b 14.30 R⊕

Metric	Earth	TOI-1294 c	Jupiter
Radius (R⊕)	1.00	14.30	11.21
Mass (M⊕)	1.00	147.00	317.83
Density (g/cm³)	5.51	0.28	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	147.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 219015370

Gaia DR2

Gaia DR2 1695343683312903168

Gaia DR3

Gaia DR3 1695343683312903168

System

TOI-1294

Percentile among Gas Giant cohort

Radius 14.300 R⊕ · percentile 82 / cohort 1771

Mass 147.000 M⊕ · percentile 12 / cohort 1747

Orbital period 159.90 d · percentile 56 / cohort 1533

Distance 332.65 pc · percentile 63 / cohort 1759

ESI 0.247 · percentile 44 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

159.900 days

Semi-major axis

0.6100 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 159.90 Earth days (43.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6100 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

15.700 m/s

Transit mid-time (BJD)

2,459,194.4000

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

1.83000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.247

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Polanski et al. 2024

Instrument

HIRES Spectrometer

Publication

2024-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2024 at W. M. Keck Observatory (2 shown).

TOI-1410 c · Neptune-like TOI-1386 c · Gas Giant

Host System: TOI-1294

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,718 K — cooler than the Sun (5,778 K)

Estimated Age

6.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.557 R☉

Stellar Mass

1.158 M☉

Metallicity [Fe/H]

0.28

Extended Stellar Properties

Surface gravity (log g)

4.119 dex

Stellar density

0.432 g/cm³

Metallicity ratio

[Fe/H]

Distance

332.65 parsec

Light-years 1,084.95 ly

V-band magnitude

11.31 mag

Voyager-speed travel 19,133,117 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.977 mas

Total Proper Motion

19.240 mas/yr

PM Right Ascension

-19.07 mas/yr

PM Declination

-2.56 mas/yr

Galactic Cartesian (pc)

x = -0.244 · y = -0.228 · z = 0.943

Equatorial (J2000)

RA 223.09264° · Dec 70.47656°

Galactic ℓ, b

109.547° · 43.373°

Ecliptic λ, β

145.863° · 72.853°

HTM-20 index

-160526013