Key parameters at a glance
- A radius of 15.69 Earth radii
- A mass of 597.52 Earth masses
- Surface gravity around 2.43 g
- An orbital period of 2.292 days
- Semi-major axis 0.0369 AU
- Equilibrium temperature 1,856 K (1583 °C)
- Distance from Earth 2,610.48 light-years
- Earth Similarity Index 0.066
- Travel time at Voyager 1 speed 46,035,770 years
HATS-42 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#180of 1771
top 10.1%
This planet
15.69R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-42 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.69 | 11.21 |
| Mass (M⊕) | 1.00 | 597.52 | 317.83 |
| Density (g/cm³) | 5.51 | 0.83 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.43 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,637.21 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 597.520 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 98283926
Gaia DR2
Gaia DR2 5603100779728361088
Gaia DR3
Gaia DR3 5603100779728361088
System
HATS-42
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.29 Earth days (0.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0369 AU.
Transit Fingerprint
Depth
1.059 %
Duration
3.266 h
Impact parameter b
0.460
Rp / R★
0.097600
Transit midpoint (BJD)
2,456,768.6073
Photometric dip
Transit produces a flux drop of 10,585 ppm lasting ≈ 3.27 h.
Extended Orbital Architecture
Planet / star radius ratio
0.097600
Semi-major axis / stellar radius
5.360
Impact parameter (b)
0.460
RV semi-amplitude (K)
246.000 m/s
Transit mid-time (BJD)
2,456,768.6073
Angular separation (arcsec)
0.04610
Eq. Temperature
1,856K
(1583 °C)
Insolation (S⊕)
1,637.21
Earth = 1.00
Earth Similarity (ESI)
0.066
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-42
Spectral Class
F-type yellow-white
Effective Temperature
6,060 K — hotter than the Sun (5,778 K)
Estimated Age
3.26 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.480 R☉
Stellar Mass
1.273 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.201 dex
Stellar density
0.550 g/cm³
Systemic radial velocity
8.16 km/s
Rotational v·sin i
6.04 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
1.221 mas
Total Proper Motion
2.977 mas/yr
PM Right Ascension
0.76 mas/yr
PM Declination
-2.88 mas/yr
Galactic Cartesian (pc)
x = -0.264 · y = 0.792 · z = -0.551
Equatorial (J2000)
RA 108.45240° · Dec -33.43735°
Galactic ℓ, b
245.353° · -10.304°
Ecliptic λ, β
117.510° · -55.128°
HTM-20 index
-786065029
Similar Worlds
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Gas Giant · F-type yellow-white
Radius 15.69 R⊕ · 690.0 ly
WASP-66 b
Gas Giant · F-type yellow-white
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HD 143811 AB b
Gas Giant · F-type yellow-white
Radius 15.69 R⊕ · 445.6 ly
TOI-1295 b
Gas Giant · F-type yellow-white
Radius 15.69 R⊕ · 1,266.2 ly
TOI-1333 b
Gas Giant · F-type yellow-white
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HATS-24 b
Gas Giant · F-type yellow-white
Radius 15.64 R⊕ · 1,611.8 ly