Key parameters at a glance
- A radius of 16.93 Earth radii
- A mass of 584.81 Earth masses
- Surface gravity around 2.04 g
- An orbital period of 2.205 days
- Semi-major axis 0.0381 AU
- Equilibrium temperature 2,733 K (2460 °C)
- Distance from Earth 1,112.45 light-years
- Earth Similarity Index 0.039
- Travel time at Voyager 1 speed 19,618,048 years
HAT-P-7 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#112of 1771
top 6.3%
This planet
16.93R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-7 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.93 | 11.21 |
| Mass (M⊕) | 1.00 | 584.81 | 317.83 |
| Density (g/cm³) | 5.51 | 0.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 4,353.41 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 584.807 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 424865156
Gaia DR2
Gaia DR2 2129256395211984000
Gaia DR3
Gaia DR3 2129256395211984000
System
HAT-P-7
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.20 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0381 AU.
Transit Fingerprint
Depth
0.600 %
Duration
3.882 h
Impact parameter b
0.496
Rp / R★
0.075408
Transit midpoint (BJD)
2,454,954.3586
Photometric dip
Transit produces a flux drop of 6,000 ppm lasting ≈ 3.88 h.
Extended Orbital Architecture
Planet / star radius ratio
0.075408
Semi-major axis / stellar radius
4.130
Impact parameter (b)
0.496
RV semi-amplitude (K)
211.800 m/s
Occultation depth
0.007 ppm
Transit mid-time (BJD)
2,454,954.3586
Long. of periastron (ω)
204.00°
Sky-projected obliquity (λ)
182.50°
True obliquity (ψ)
86.30°
Angular separation (arcsec)
0.11200
Eq. Temperature
2,733K
(2460 °C)
Insolation (S⊕)
4,353.41
Earth = 1.00
Earth Similarity (ESI)
0.039
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Orbital-brightness modulation
Host star brightness varies with the planet's orbit.
Discovery Paper
Primary reference
Pal et al. 2008Instrument
2K CCD Sensor
Publication
2008-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2008 at HATNet (3 shown).
Host System: HAT-P-7
Spectral Class
F-type yellow-white
Effective Temperature
6,389 K — hotter than the Sun (5,778 K)
Estimated Age
1.78 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
2.000 R☉
Stellar Mass
1.560 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.070 dex
Stellar density
0.270 g/cm³
Systemic radial velocity
-11.00 km/s
Rotational v·sin i
3.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
2.903 mas
Total Proper Motion
20.337 mas/yr
PM Right Ascension
-18.28 mas/yr
PM Declination
8.91 mas/yr
Galactic Cartesian (pc)
x = 0.253 · y = -0.620 · z = 0.743
Equatorial (J2000)
RA 292.24719° · Dec 47.96954°
Galactic ℓ, b
80.033° · 13.975°
Ecliptic λ, β
312.864° · 68.124°
HTM-20 index
-717500257
Observation Record
Photometric series
13
RV measurements
3
Transmission spectra
3
Emission spectra
10
Archive notes
4
Similar Worlds
HAT-P-56 b
Gas Giant · F-type yellow-white
Radius 16.93 R⊕ · 1,045.8 ly
WASP-176 b
Gas Giant · F-type yellow-white
Radius 16.87 R⊕ · 1,853.9 ly
TOI-1181 b
Gas Giant · F-type yellow-white
Radius 17.03 R⊕ · 987.7 ly
HATS-65 b
Gas Giant · F-type yellow-white
Radius 16.82 R⊕ · 1,609.0 ly
HATS-27 b
Gas Giant · F-type yellow-white
Radius 16.81 R⊕ · 2,664.7 ly
WASP-168 b
Gas Giant · F-type yellow-white
Radius 16.81 R⊕ · 991.3 ly