Key parameters at a glance
- A radius of 11.48 Earth radii
- A mass of 117.60 Earth masses
- Surface gravity around 0.89 g
- An orbital period of 3.796 days
- Semi-major axis 0.0375 AU
- Equilibrium temperature 587 K (314 °C)
- Distance from Earth 457.35 light-years
- Earth Similarity Index 0.224
- Travel time at Voyager 1 speed 8,065,406 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-71 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1592of 1771
top 89.8%
This planet
11.48R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-71 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.48 | 11.21 |
| Mass (M⊕) | 1.00 | 117.60 | 317.83 |
| Density (g/cm³) | 5.51 | 0.42 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.89 | 2.53 |
| Insolation (S⊕) | 1.00 | 18.08 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 117.597 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 234523599
Gaia DR2
Gaia DR2 4710594412266148352
Gaia DR3
Gaia DR3 4710594412266148352
System
HATS-71
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.80 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0374 AU.
Transit Fingerprint
Depth
5.228 %
Duration
2.015 h
Impact parameter b
0.348
Rp / R★
0.220200
Transit midpoint (BJD)
2,457,858.8013
Photometric dip
Transit produces a flux drop of 52,279 ppm lasting ≈ 2.01 h.
Extended Orbital Architecture
Planet / star radius ratio
0.220200
Semi-major axis / stellar radius
16.840
Impact parameter (b)
0.348
RV semi-amplitude (K)
77.000 m/s
Transit mid-time (BJD)
2,457,858.8013
Angular separation (arcsec)
0.26700
Eq. Temperature
587K
(314 °C)
Insolation (S⊕)
18.08
Earth = 1.00
Earth Similarity (ESI)
0.224
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
Bakos et al. 2020Instrument
Apogee 4K CCD Sensor
Publication
2020-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2020 at HATSouth (6 shown).
Host System: HATS-71
Spectral Class
M-type red dwarf
Effective Temperature
3,405 K — cooler than the Sun (5,778 K)
Estimated Age
3.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.478 R☉
Stellar Mass
0.486 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.765 dex
Stellar density
6.260 g/cm³
Rotation period
41.72 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
7.103 mas
Total Proper Motion
83.383 mas/yr
PM Right Ascension
78.86 mas/yr
PM Declination
-27.09 mas/yr
Galactic Cartesian (pc)
x = 0.456 · y = 0.127 · z = -0.881
Equatorial (J2000)
RA 15.55189° · Dec -61.75613°
Galactic ℓ, b
300.693° · -55.325°
Ecliptic λ, β
332.825° · -59.173°
HTM-20 index
2130003252
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