Key parameters at a glance

A radius of 13.56 Earth radii
A mass of 311.47 Earth masses
Surface gravity around 1.69 g
An orbital period of 2.788 days
Semi-major axis 0.0407 AU
Equilibrium temperature 1,517 K (1244 °C)
Distance from Earth 989.35 light-years
Earth Similarity Index 0.084
Travel time at Voyager 1 speed 17,447,161 years

HAT-P-5 b Planet Profile

Physical Specs

Radius

13.56 R⊕

Radius (Jupiter)

1.210 R♃

Mass

311.47 M⊕

Mass (Jupiter)

0.980 M♃

Density

0.67 g/cm³

Surface Gravity

1.69 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.084

HZ Position Inner

Controversial No

Discovery

Year 2007

Method Transit

Facility HATNet

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#660of 1771

top 37.2%

This planet

13.56R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-133 b 13.56 R⊕ WASP-26 b 13.56 R⊕ WASP-141 b 13.56 R⊕

Metric	Earth	HAT-P-5 b	Jupiter
Radius (R⊕)	1.00	13.56	11.21
Mass (M⊕)	1.00	311.47	317.83
Density (g/cm³)	5.51	0.67	1.33
Surface Gravity (g)	1.00	1.69	2.53
Insolation (S⊕)	1.00	850.68	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	311.473 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 76419763

Gaia DR2

Gaia DR2 4606030169272920320

Gaia DR3

Gaia DR3 4606030169272920320

System

HAT-P-5

Percentile among Gas Giant cohort

Radius 13.563 R⊕ · percentile 63 / cohort 1771

Mass 311.473 M⊕ · percentile 34 / cohort 1747

Orbital period 2.79 d · percentile 13 / cohort 1533

Distance 303.34 pc · percentile 60 / cohort 1759

ESI 0.084 · percentile 20 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.788 days

Semi-major axis

0.0407 AU

Eccentricity

0.000

Inclination

86.75 °

Year Length

A year here lasts approximately 2.79 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0407 AU.

Transit Fingerprint

Depth

1.200 %

Duration

2.946 h

Impact parameter b

0.425

Rp / R★

0.110600

Transit midpoint (BJD)

2,455,432.4551

Photometric dip

Transit produces a flux drop of 12,000 ppm lasting ≈ 2.95 h.

Extended Orbital Architecture

Planet / star radius ratio

0.110600

Semi-major axis / stellar radius

7.530

Impact parameter (b)

0.425

RV semi-amplitude (K)

138.000 m/s

Transit mid-time (BJD)

2,455,432.4551

Angular separation (arcsec)

0.13400

Eq. Temperature

1,517K

(1244 °C)

Insolation (S⊕)

850.68

Earth = 1.00

Earth Similarity (ESI)

0.084

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. 2007

Instrument

2K CCD Sensor

Publication

2007-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at HATNet (4 shown).

HAT-P-3 b · Gas Giant HAT-P-2 b · Gas Giant HAT-P-6 b · Gas Giant HAT-P-4 b · Gas Giant

Host System: HAT-P-5

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,960 K — hotter than the Sun (5,778 K)

Estimated Age

2.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.120 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

1.040 g/cm³

Systemic radial velocity

7.61 km/s

Rotational v·sin i

2.60 km/s

Metallicity ratio

[Fe/H]

Distance

303.34 parsec

Light-years 989.35 ly

V-band magnitude

11.95 mag

Voyager-speed travel 17,447,161 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.268 mas

Total Proper Motion

13.310 mas/yr

PM Right Ascension

11.87 mas/yr

PM Declination

6.03 mas/yr

Galactic Cartesian (pc)

x = 0.062 · y = -0.800 · z = 0.597

Equatorial (J2000)

RA 274.40553° · Dec 36.62146°

Galactic ℓ, b

63.937° · 22.149°

Ecliptic λ, β

277.069° · 59.953°

HTM-20 index

1391802743

Observation Record

Photometric series

RV measurements

Emission spectra