Key parameters at a glance
- A radius of 11.31 Earth radii
- A mass of 259.98 Earth masses
- Surface gravity around 2.03 g
- An orbital period of 2.754 days
- Semi-major axis 0.0369 AU
- Equilibrium temperature 1,218 K (945 °C)
- Distance from Earth 1,177.93 light-years
- Earth Similarity Index 0.122
- Travel time at Voyager 1 speed 20,772,771 years
- Almost certainly tidally locked to its host star given the close orbit
HAT-P-52 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1614of 1771
top 91.1%
This planet
11.31R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-52 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.31 | 11.21 |
| Mass (M⊕) | 1.00 | 259.98 | 317.83 |
| Density (g/cm³) | 5.51 | 0.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 227.76 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 259.985 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 436875934
Gaia DR2
Gaia DR2 128623485853170432
Gaia DR3
Gaia DR3 128623485853170432
System
HAT-P-52
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.75 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0369 AU.
Transit Fingerprint
Depth
1.446 %
Duration
2.407 h
Impact parameter b
0.461
Rp / R★
0.116100
Transit midpoint (BJD)
2,455,852.1033
Photometric dip
Transit produces a flux drop of 14,460 ppm lasting ≈ 2.41 h.
Extended Orbital Architecture
Planet / star radius ratio
0.116100
Semi-major axis / stellar radius
8.890
Impact parameter (b)
0.461
RV semi-amplitude (K)
128.400 m/s
Transit mid-time (BJD)
2,455,852.1033
Angular separation (arcsec)
0.10200
Eq. Temperature
1,218K
(945 °C)
Insolation (S⊕)
227.76
Earth = 1.00
Earth Similarity (ESI)
0.122
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
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. 2015Instrument
Multiple Instruments
Publication
2015-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2015 at HATNet (7 shown).
Host System: HAT-P-52
Spectral Class
K-type orange
Effective Temperature
5,131 K — cooler than the Sun (5,778 K)
Estimated Age
9.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.893 R☉
Stellar Mass
0.887 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.483 dex
Stellar density
1.750 g/cm³
Systemic radial velocity
61.50 km/s
Rotational v·sin i
0.60 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
2.740 mas
Total Proper Motion
31.224 mas/yr
PM Right Ascension
14.87 mas/yr
PM Declination
-27.46 mas/yr
Galactic Cartesian (pc)
x = 0.642 · y = 0.593 · z = 0.485
Equatorial (J2000)
RA 42.72174° · Dec 29.02225°
Galactic ℓ, b
152.178° · -26.980°
Ecliptic λ, β
48.930° · 12.072°
HTM-20 index
-803910882
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