Key parameters at a glance
- A radius of 16.93 Earth radii
- A mass of 734.19 Earth masses
- Surface gravity around 2.56 g
- An orbital period of 2.791 days
- Semi-major axis 0.0423 AU
- Equilibrium temperature 1,840 K (1567 °C)
- Distance from Earth 1,045.78 light-years
- Earth Similarity Index 0.064
- Travel time at Voyager 1 speed 18,442,388 years
HAT-P-56 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-56 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.93 | 11.21 |
| Mass (M⊕) | 1.00 | 734.19 | 317.83 |
| Density (g/cm³) | 5.51 | 0.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.56 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,515.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 734.187 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 262389
HIP
HIP 32209
TIC
TIC 84339983
Gaia DR2
Gaia DR2 3385777286999240576
Gaia DR3
Gaia DR3 3385777286999240576
System
HAT-P-56
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.79 Earth days (0.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0423 AU.
Transit Fingerprint
Depth
1.100 %
Duration
2.260 h
Impact parameter b
0.873
Rp / R★
0.105400
Transit midpoint (BJD)
2,456,774.0916
Photometric dip
Transit produces a flux drop of 11,000 ppm lasting ≈ 2.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.105400
Semi-major axis / stellar radius
6.370
Impact parameter (b)
0.873
RV semi-amplitude (K)
262.000 m/s
Transit mid-time (BJD)
2,456,774.0916
Sky-projected obliquity (λ)
8.00°
Angular separation (arcsec)
0.13200
Eq. Temperature
1,840K
(1567 °C)
Insolation (S⊕)
3,515.00
Earth = 1.00
Earth Similarity (ESI)
0.064
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
Huang et al. 2015Instrument
2K CCD Sensor
Publication
2015-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2015 at HATNet (7 shown).
Host System: HAT-P-56
Spectral Class
F-type yellow-white
Effective Temperature
6,566 K — hotter than the Sun (5,778 K)
Estimated Age
2.01 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.470 R☉
Stellar Mass
1.420 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
3.390 dex
Stellar density
0.630 g/cm³
Systemic radial velocity
35.11 km/s
Rotational v·sin i
40.06 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.091 mas
Total Proper Motion
24.362 mas/yr
PM Right Ascension
-8.16 mas/yr
PM Declination
-22.95 mas/yr
Galactic Cartesian (pc)
x = -0.167 · y = 0.873 · z = 0.458
Equatorial (J2000)
RA 100.84801° · Dec 27.25218°
Galactic ℓ, b
187.538° · 10.430°
Ecliptic λ, β
99.654° · 4.176°
HTM-20 index
-623677494
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