Key parameters at a glance
- A radius of 12.52 Earth radii
- A mass of 117.28 Earth masses
- Surface gravity around 0.75 g
- An orbital period of 3.923 days
- Semi-major axis 0.0427 AU
- Equilibrium temperature 853 K (580 °C)
- Distance from Earth 980.65 light-years
- Earth Similarity Index 0.145
- Travel time at Voyager 1 speed 17,293,819 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-47 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1232of 1771
top 69.5%
This planet
12.52R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-47 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.52 | 11.21 |
| Mass (M⊕) | 1.00 | 117.28 | 317.83 |
| Density (g/cm³) | 5.51 | 0.33 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.75 | 2.53 |
| Insolation (S⊕) | 1.00 | 87.73 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 117.279 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 158297421
Gaia DR2
Gaia DR2 6658373007402886400
Gaia DR3
Gaia DR3 6658373007402886400
System
HATS-47
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.92 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0427 AU.
Transit Fingerprint
Depth
3.151 %
Duration
2.002 h
Impact parameter b
0.713
Rp / R★
0.174600
Transit midpoint (BJD)
2,457,365.3580
Photometric dip
Transit produces a flux drop of 31,511 ppm lasting ≈ 2.00 h.
Extended Orbital Architecture
Planet / star radius ratio
0.174600
Semi-major axis / stellar radius
13.980
Impact parameter (b)
0.713
RV semi-amplitude (K)
61.700 m/s
Transit mid-time (BJD)
2,457,365.3580
Angular separation (arcsec)
0.14200
Eq. Temperature
853K
(580 °C)
Insolation (S⊕)
87.73
Earth = 1.00
Earth Similarity (ESI)
0.145
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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. 2020Instrument
Apogee 4K CCD Sensor
Publication
2020-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2020 at HATSouth (6 shown).
Host System: HATS-47
Spectral Class
K-type orange
Effective Temperature
4,512 K — cooler than the Sun (5,778 K)
Estimated Age
8.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.656 R☉
Stellar Mass
0.674 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.633 dex
Stellar density
3.360 g/cm³
Systemic radial velocity
3.20 km/s
Rotational v·sin i
2.47 km/s
Rotation period
6.42 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
3.298 mas
Total Proper Motion
6.200 mas/yr
PM Right Ascension
3.83 mas/yr
PM Declination
4.88 mas/yr
Galactic Cartesian (pc)
x = 0.194 · y = -0.617 · z = -0.762
Equatorial (J2000)
RA 287.48440° · Dec -49.66494°
Galactic ℓ, b
347.515° · -23.206°
Ecliptic λ, β
282.601° · -26.988°
HTM-20 index
854869513
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