Key parameters at a glance

A radius of 23.99 Earth radii
A mass of 143.02 Earth masses
Surface gravity around 0.25 g
An orbital period of 4.810 days
Semi-major axis 0.0651 AU
Equilibrium temperature 1,903 K (1630 °C)
Distance from Earth 1,212.28 light-years
Earth Similarity Index 0.035
Travel time at Voyager 1 speed 21,378,489 years

HAT-P-67 b Planet Profile

Physical Specs

Radius

23.99 R⊕

Radius (Jupiter)

2.140 R♃

Mass

143.02 M⊕

Mass (Jupiter)

0.450 M♃

Density

0.06 g/cm³

Surface Gravity

0.25 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.035

HZ Position Inner

Controversial No

Discovery

Year 2017

Method Transit

Facility HATNet

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#8of 1771

top 0.4%

This planet

23.99R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-3540 A b 23.54 R⊕ CT Cha b 24.66 R⊕ XO-6 b 23.20 R⊕

Metric	Earth	HAT-P-67 b	Jupiter
Radius (R⊕)	1.00	23.99	11.21
Mass (M⊕)	1.00	143.02	317.83
Density (g/cm³)	5.51	0.06	1.33
Surface Gravity (g)	1.00	0.25	2.53
Insolation (S⊕)	1.00	2,029.17	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	143.023 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 198588220

Gaia DR2

Gaia DR2 1358614983131339392

Gaia DR3

Gaia DR3 1358614983131339392

System

HAT-P-67

Percentile among Gas Giant cohort

Radius 23.987 R⊕ · percentile 100 / cohort 1771

Mass 143.023 M⊕ · percentile 11 / cohort 1747

Orbital period 4.81 d · percentile 35 / cohort 1533

Distance 371.69 pc · percentile 67 / cohort 1759

ESI 0.035 · percentile 1 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.810 days

Semi-major axis

0.0651 AU

Eccentricity

0.000

Inclination

88.80 °

Year Length

A year here lasts approximately 4.81 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0650 AU.

Transit Fingerprint

Depth

0.697 %

Duration

6.989 h

Impact parameter b

0.460

Rp / R★

0.082000

Transit midpoint (BJD)

2,459,010.9917

Photometric dip

Transit produces a flux drop of 6,965 ppm lasting ≈ 6.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.082000

Semi-major axis / stellar radius

5.173

Impact parameter (b)

0.460

RV semi-amplitude (K)

38.000 m/s

Transit mid-time (BJD)

2,459,010.9917

Angular separation (arcsec)

0.17500

Eq. Temperature

1,903K

(1630 °C)

Insolation (S⊕)

2,029.17

Earth = 1.00

Earth Similarity (ESI)

0.035

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

Zhou et al. 2017

Instrument

2K CCD Sensor

Publication

2017-05

Observation locale

Ground

Host System: HAT-P-67

Spectral Class

F-type yellow-white

Effective Temperature

6,640 K — hotter than the Sun (5,778 K)

Estimated Age

1.46 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.620 R☉

Stellar Mass

1.730 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

3.840 dex

Stellar density

0.098 g/cm³

Systemic radial velocity

-1.40 km/s

Rotational v·sin i

35.80 km/s

Rotation period

5.40 days

Metallicity ratio

[Fe/H]

Distance

371.69 parsec

Light-years 1,212.28 ly

V-band magnitude

10.11 mag

Voyager-speed travel 21,378,489 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

2.662 mas

Total Proper Motion

20.487 mas/yr

PM Right Ascension

9.44 mas/yr

PM Declination

-18.18 mas/yr

Galactic Cartesian (pc)

x = -0.164 · y = -0.691 · z = 0.704

Equatorial (J2000)

RA 256.61073° · Dec 44.77688°

Galactic ℓ, b

70.158° · 36.911°

Ecliptic λ, β

245.052° · 67.060°

HTM-20 index

737771638