Key parameters at a glance
- A radius of 14.90 Earth radii
- A mass of 629.14 Earth masses
- Surface gravity around 2.84 g
- An orbital period of 0.838 days
- Semi-major axis 0.0174 AU
- Equilibrium temperature 2,069 K (1796 °C)
- Distance from Earth 2,036.41 light-years
- Earth Similarity Index 0.062
- Travel time at Voyager 1 speed 35,912,153 years
HATS-18 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#244of 1771
top 13.7%
This planet
14.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-18 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.90 | 11.21 |
| Mass (M⊕) | 1.00 | 629.14 | 317.83 |
| Density (g/cm³) | 5.51 | 1.12 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.84 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,990.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 629.144 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 14614418
Gaia DR2
Gaia DR2 3483636295772522880
Gaia DR3
Gaia DR3 3483636295773117440
System
HATS-18
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 20.1 hours long on a mildly elliptical path at a mean orbital distance of 0.0174 AU.
Transit Fingerprint
Depth
2.136 %
Duration
1.944 h
Impact parameter b
0.300
Rp / R★
0.132000
Transit midpoint (BJD)
2,458,217.6437
Photometric dip
Transit produces a flux drop of 21,356 ppm lasting ≈ 1.94 h.
Extended Orbital Architecture
Planet / star radius ratio
0.132000
Semi-major axis / stellar radius
3.658
Impact parameter (b)
0.300
RV semi-amplitude (K)
415.200 m/s
Transit mid-time (BJD)
2,458,217.6437
Angular separation (arcsec)
0.02790
Eq. Temperature
2,069K
(1796 °C)
Insolation (S⊕)
2,990.00
Earth = 1.00
Earth Similarity (ESI)
0.062
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
Penev et al. 2016Instrument
Multiple Instruments
Publication
2016-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at Multiple Observatories (12 shown).
Host System: HATS-18
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,600 K — cooler than the Sun (5,778 K)
Estimated Age
4.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.020 R☉
Stellar Mass
1.037 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.436 dex
Stellar density
1.370 g/cm³
Systemic radial velocity
7.66 km/s
Rotational v·sin i
6.23 km/s
Rotation period
9.80 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
1.574 mas
Total Proper Motion
5.844 mas/yr
PM Right Ascension
3.18 mas/yr
PM Declination
-4.90 mas/yr
Galactic Cartesian (pc)
x = -0.868 · y = 0.092 · z = -0.487
Equatorial (J2000)
RA 173.95742° · Dec -29.15606°
Galactic ℓ, b
283.687° · 30.875°
Ecliptic λ, β
187.179° · -28.918°
HTM-20 index
-1921751017
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