Key parameters at a glance
- A radius of 8.10 Earth radii
- A mass of 39.86 Earth masses
- Surface gravity around 0.61 g
- An orbital period of 7.328 days
- Semi-major axis 0.0665 AU
- Equilibrium temperature 739 K (466 °C)
- Distance from Earth 416.14 light-years
- Earth Similarity Index 0.195
- Travel time at Voyager 1 speed 7,338,614 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-72 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#150of 574
top 26.0%
This planet
8.10R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HATS-72 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.10 | 11.21 |
| Mass (M⊕) | 1.00 | 39.86 | 317.83 |
| Density (g/cm³) | 5.51 | 0.41 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.61 | 2.53 |
| Insolation (S⊕) | 1.00 | 49.58 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 39.856 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 188570092
Gaia DR2
Gaia DR2 2594869603582993792
Gaia DR3
Gaia DR3 2594869603582993792
System
HATS-72
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.33 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0665 AU.
Transit Fingerprint
Depth
1.371 %
Duration
3.085 h
Impact parameter b
0.153
Rp / R★
0.102900
Transit midpoint (BJD)
2,458,087.6478
Photometric dip
Transit produces a flux drop of 13,710 ppm lasting ≈ 3.08 h.
Extended Orbital Architecture
Planet / star radius ratio
0.102900
Semi-major axis / stellar radius
19.821
Impact parameter (b)
0.153
RV semi-amplitude (K)
16.150 m/s
Transit mid-time (BJD)
2,458,087.6478
Angular separation (arcsec)
0.52100
Eq. Temperature
739K
(466 °C)
Insolation (S⊕)
49.58
Earth = 1.00
Earth Similarity (ESI)
0.195
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-72
Spectral Class
K-type orange
Effective Temperature
4,656 K — cooler than the Sun (5,778 K)
Estimated Age
12.17 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.721 R☉
Stellar Mass
0.731 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.585 dex
Stellar density
2.743 g/cm³
Systemic radial velocity
15.95 km/s
Rotational v·sin i
0.80 km/s
Rotation period
48.73 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
7.809 mas
Total Proper Motion
137.564 mas/yr
PM Right Ascension
-108.62 mas/yr
PM Declination
-84.41 mas/yr
Galactic Cartesian (pc)
x = 0.893 · y = -0.342 · z = -0.292
Equatorial (J2000)
RA 339.02584° · Dec -17.00030°
Galactic ℓ, b
43.777° · -57.171°
Ecliptic λ, β
334.264° · -7.590°
HTM-20 index
-1080701130
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