Key parameters at a glance

A radius of 15.98 Earth radii
A mass of 283.49 Earth masses
Surface gravity around 1.11 g
An orbital period of 3.129 days
Semi-major axis 0.0452 AU
Equilibrium temperature 1,652 K (1379 °C)
Distance from Earth 974.03 light-years
Earth Similarity Index 0.066
Travel time at Voyager 1 speed 17,177,058 years

HAT-P-45 b Planet Profile

Physical Specs

Radius

15.98 R⊕

Radius (Jupiter)

1.426 R♃

Mass

283.49 M⊕

Mass (Jupiter)

0.892 M♃

Density

0.38 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.066

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility HATNet

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#163of 1771

top 9.1%

This planet

15.98R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-5 b 15.98 R⊕ K2-107 b 15.98 R⊕ TOI-3523 A b 15.97 R⊕

Metric	Earth	HAT-P-45 b	Jupiter
Radius (R⊕)	1.00	15.98	11.21
Mass (M⊕)	1.00	283.49	317.83
Density (g/cm³)	5.51	0.38	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	1,052.24	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	283.492 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 167227214

Gaia DR2

Gaia DR2 4270547520706275328

Gaia DR3

Gaia DR3 4270547520706275328

System

HAT-P-45

Percentile among Gas Giant cohort

Radius 15.984 R⊕ · percentile 91 / cohort 1771

Mass 283.492 M⊕ · percentile 31 / cohort 1747

Orbital period 3.13 d · percentile 18 / cohort 1533

Distance 298.64 pc · percentile 60 / cohort 1759

ESI 0.066 · percentile 11 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.129 days

Semi-major axis

0.0452 AU

Eccentricity

0.049

Inclination

87.80 °

Year Length

A year here lasts approximately 3.13 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0452 AU.

Transit Fingerprint

Depth

1.343 %

Duration

3.446 h

Impact parameter b

0.281

Rp / R★

0.111000

Transit midpoint (BJD)

2,455,729.9861

Photometric dip

Transit produces a flux drop of 13,426 ppm lasting ≈ 3.45 h.

Extended Orbital Architecture

Planet / star radius ratio

0.111000

Semi-major axis / stellar radius

7.360

Impact parameter (b)

0.281

RV semi-amplitude (K)

106.600 m/s

Transit mid-time (BJD)

2,455,729.9861

Long. of periastron (ω)

146.00°

Angular separation (arcsec)

0.15100

Eq. Temperature

1,652K

(1379 °C)

Insolation (S⊕)

1,052.24

Earth = 1.00

Earth Similarity (ESI)

0.066

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

Hartman et al. 2014

Instrument

2K CCD Sensor

Publication

2014-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at HATNet (3 shown).

HAT-P-44 b · Gas Giant HAT-P-46 b · Gas Giant HAT-P-49 b · Gas Giant

Host System: HAT-P-45

Spectral Class

F-type yellow-white

Effective Temperature

6,330 K — hotter than the Sun (5,778 K)

Estimated Age

2.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.319 R☉

Stellar Mass

1.259 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.300 dex

Stellar density

0.457 g/cm³

Systemic radial velocity

23.90 km/s

Rotational v·sin i

9.30 km/s

Metallicity ratio

[Fe/H]

Distance

298.64 parsec

Light-years 974.03 ly

V-band magnitude

12.78 mag

Voyager-speed travel 17,177,058 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.322 mas

Total Proper Motion

8.531 mas/yr

PM Right Ascension

7.06 mas/yr

PM Declination

-4.79 mas/yr

Galactic Cartesian (pc)

x = 0.076 · y = -0.995 · z = -0.059

Equatorial (J2000)

RA 274.37327° · Dec -3.38106°

Galactic ℓ, b

26.022° · 5.982°

Ecliptic λ, β

274.642° · 19.988°

HTM-20 index

-451054554