Key parameters at a glance
- A radius of 17.71 Earth radii
- A mass of 505.35 Earth masses
- Surface gravity around 1.61 g
- An orbital period of 3.264 days
- Semi-major axis 0.0500 AU
- Equilibrium temperature 2,101 K (1828 °C)
- Distance from Earth 4,377.96 light-years
- Earth Similarity Index 0.050
- Travel time at Voyager 1 speed 77,205,309 years
HATS-40 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#85of 1771
top 4.7%
This planet
17.71R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-40 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 17.71 | 11.21 |
| Mass (M⊕) | 1.00 | 505.35 | 317.83 |
| Density (g/cm³) | 5.51 | 0.49 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.61 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,163.38 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 505.350 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 172598832
Gaia DR2
Gaia DR2 2894378838731535872
Gaia DR3
Gaia DR3 2894378838731535872
System
HATS-40
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.26 Earth days (0.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0500 AU.
Transit Fingerprint
Depth
0.501 %
Duration
5.330 h
Impact parameter b
0.350
Rp / R★
0.071600
Transit midpoint (BJD)
2,456,962.6760
Photometric dip
Transit produces a flux drop of 5,012 ppm lasting ≈ 5.33 h.
Extended Orbital Architecture
Planet / star radius ratio
0.071600
Semi-major axis / stellar radius
4.740
Impact parameter (b)
0.350
RV semi-amplitude (K)
162.000 m/s
Transit mid-time (BJD)
2,456,962.6760
Angular separation (arcsec)
0.03720
Eq. Temperature
2,101K
(1828 °C)
Insolation (S⊕)
3,163.38
Earth = 1.00
Earth Similarity (ESI)
0.050
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
Bento et al. 2018Instrument
Apogee 4K CCD Sensor
Publication
2018-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at HATSouth (12 shown).
Host System: HATS-40
Spectral Class
F-type yellow-white
Effective Temperature
6,460 K — hotter than the Sun (5,778 K)
Estimated Age
2.07 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
2.260 R☉
Stellar Mass
1.561 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
3.921 dex
Stellar density
0.189 g/cm³
Systemic radial velocity
9.19 km/s
Rotational v·sin i
9.52 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
0.716 mas
Total Proper Motion
7.083 mas/yr
PM Right Ascension
-4.34 mas/yr
PM Declination
5.59 mas/yr
Galactic Cartesian (pc)
x = -0.159 · y = 0.853 · z = -0.497
Equatorial (J2000)
RA 100.57125° · Dec -29.77678°
Galactic ℓ, b
239.102° · -14.910°
Ecliptic λ, β
105.216° · -52.659°
HTM-20 index
1369058199
Similar Worlds
WASP-167 b
Gas Giant · F-type yellow-white
Radius 17.71 R⊕ · 1,381.4 ly
WASP-94 A b
Gas Giant · F-type yellow-white
Radius 17.71 R⊕ · 688.9 ly
WASP-54 b
Gas Giant · F-type yellow-white
Radius 17.71 R⊕ · 819.6 ly
HAT-P-39 b
Gas Giant · F-type yellow-white
Radius 17.61 R⊕ · 2,273.3 ly
HATS-39 b
Gas Giant · F-type yellow-white
Radius 17.60 R⊕ · 2,865.3 ly
WASP-172 b
Gas Giant · F-type yellow-white
Radius 17.60 R⊕ · 1,755.1 ly