Key parameters at a glance
- A radius of 12.58 Earth radii
- A mass of 435.42 Earth masses
- Surface gravity around 2.75 g
- An orbital period of 1.354 days
- Semi-major axis 0.0232 AU
- Equilibrium temperature 1,550 K (1277 °C)
- Distance from Earth 1,115.21 light-years
- Earth Similarity Index 0.092
- Travel time at Voyager 1 speed 19,666,708 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-2 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1226of 1771
top 69.2%
This planet
12.58R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-2 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.58 | 11.21 |
| Mass (M⊕) | 1.00 | 435.42 | 317.83 |
| Density (g/cm³) | 5.51 | 1.21 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.75 | 2.53 |
| Insolation (S⊕) | 1.00 | 950.06 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 435.425 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 413376180
Gaia DR2
Gaia DR2 3492502001623237888
Gaia DR3
Gaia DR3 3492502001623237888
System
HATS-2
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.35 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0232 AU.
Transit Fingerprint
Depth
2.004 %
Duration
2.069 h
Impact parameter b
0.271
Rp / R★
0.133500
Transit midpoint (BJD)
2,458,591.0849
Photometric dip
Transit produces a flux drop of 20,040 ppm lasting ≈ 2.07 h.
Extended Orbital Architecture
Planet / star radius ratio
0.133500
Semi-major axis / stellar radius
5.500
Impact parameter (b)
0.271
RV semi-amplitude (K)
268.900 m/s
Transit mid-time (BJD)
2,458,591.0849
Long. of periastron (ω)
0.00°
Sky-projected obliquity (λ)
2.72°
True obliquity (ψ)
38.49°
Angular separation (arcsec)
0.06780
Eq. Temperature
1,550K
(1277 °C)
Insolation (S⊕)
950.06
Earth = 1.00
Earth Similarity (ESI)
0.092
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
Mohler Fischer et al. 2013Instrument
Apogee 4K CCD Sensor
Publication
2013-10
Observation locale
Ground
Host System: HATS-2
Spectral Class
K-type orange
Effective Temperature
5,227 K — cooler than the Sun (5,778 K)
Estimated Age
7.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.876 R☉
Stellar Mass
0.904 M☉
Metallicity [Fe/H]
0.15
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
1.346 g/cm³
Rotational v·sin i
1.50 km/s
Rotation period
22.46 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.896 mas
Total Proper Motion
46.438 mas/yr
PM Right Ascension
-46.42 mas/yr
PM Declination
-1.17 mas/yr
Galactic Cartesian (pc)
x = -0.922 · y = 0.053 · z = -0.384
Equatorial (J2000)
RA 176.73883° · Dec -22.56301°
Galactic ℓ, b
283.964° · 37.922°
Ecliptic λ, β
186.458° · -21.897°
HTM-20 index
-801087745
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