Key parameters at a glance

A radius of 12.54 Earth radii
A mass of 195.15 Earth masses
Surface gravity around 1.24 g
An orbital period of 3.378 days
Semi-major axis 0.0429 AU
Equilibrium temperature 1,237 K (964 °C)
Distance from Earth 1,315.90 light-years
Earth Similarity Index 0.105
Travel time at Voyager 1 speed 23,205,939 years

HAT-P-63 b Planet Profile

Physical Specs

Radius

12.54 R⊕

Radius (Jupiter)

1.119 R♃

Mass

195.15 M⊕

Mass (Jupiter)

0.614 M♃

Density

0.54 g/cm³

Surface Gravity

1.24 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.105

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility HATNet

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1228of 1771

top 69.3%

This planet

12.54R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-6 b 12.54 R⊕ TOI-2989 b 12.55 R⊕ TOI-4666 b 12.53 R⊕

Metric	Earth	HAT-P-63 b	Jupiter
Radius (R⊕)	1.00	12.54	11.21
Mass (M⊕)	1.00	195.15	317.83
Density (g/cm³)	5.51	0.54	1.33
Surface Gravity (g)	1.00	1.24	2.53
Insolation (S⊕)	1.00	387.40	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	195.147 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 325670253

Gaia DR2

Gaia DR2 4474644332250439552

Gaia DR3

Gaia DR3 4474644332250439552

System

HAT-P-63

Percentile among Gas Giant cohort

Radius 12.543 R⊕ · percentile 31 / cohort 1771

Mass 195.147 M⊕ · percentile 19 / cohort 1747

Orbital period 3.38 d · percentile 21 / cohort 1533

Distance 403.46 pc · percentile 70 / cohort 1759

ESI 0.105 · percentile 28 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.378 days

Semi-major axis

0.0429 AU

Eccentricity

0.069

Inclination

88.45 °

Year Length

A year here lasts approximately 3.38 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0429 AU.

Transit Fingerprint

Depth

1.729 %

Duration

2.933 h

Impact parameter b

0.262

Rp / R★

0.119100

Transit midpoint (BJD)

2,456,382.9426

Photometric dip

Transit produces a flux drop of 17,290 ppm lasting ≈ 2.93 h.

Extended Orbital Architecture

Planet / star radius ratio

0.119100

Semi-major axis / stellar radius

9.560

Impact parameter (b)

0.262

RV semi-amplitude (K)

87.300 m/s

Transit mid-time (BJD)

2,456,382.9426

Angular separation (arcsec)

0.10600

Eq. Temperature

1,237K

(964 °C)

Insolation (S⊕)

387.40

Earth = 1.00

Earth Similarity (ESI)

0.105

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

Bakos et al. 2021

Instrument

Apogee 4K CCD Sensor

Publication

2021-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at HATNet (6 shown).

HAT-P-59 b · Gas Giant HAT-P-61 b · Gas Giant HAT-P-62 b · Gas Giant HAT-P-58 b · Gas Giant HAT-P-60 b · Gas Giant HAT-P-64 b · Gas Giant

Host System: HAT-P-63

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,400 K — cooler than the Sun (5,778 K)

Estimated Age

9.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.966 R☉

Stellar Mass

0.925 M☉

Metallicity [Fe/H]

0.25

Extended Stellar Properties

Surface gravity (log g)

4.435 dex

Stellar density

1.448 g/cm³

Systemic radial velocity

-68.99 km/s

Metallicity ratio

[Fe/H]

Distance

403.46 parsec

Light-years 1,315.90 ly

V-band magnitude

13.66 mag

Voyager-speed travel 23,205,939 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.450 mas

Total Proper Motion

14.874 mas/yr

PM Right Ascension

-14.87 mas/yr

PM Declination

-0.30 mas/yr

Galactic Cartesian (pc)

x = -0.007 · y = -0.995 · z = 0.100

Equatorial (J2000)

RA 269.57207° · Dec 5.76137°

Galactic ℓ, b

32.049° · 14.436°

Ecliptic λ, β

269.508° · 29.200°

HTM-20 index

-2100534109