Key parameters at a glance
- A radius of 9.91 Earth radii
- A mass of 156.05 Earth masses
- Surface gravity around 1.59 g
- An orbital period of 2.789 days
- Semi-major axis 0.0327 AU
- Equilibrium temperature 772 K (499 °C)
- Distance from Earth 635.89 light-years
- Earth Similarity Index 0.202
- Travel time at Voyager 1 speed 11,213,863 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-75 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#10of 574
top 1.6%
This planet
9.91R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HATS-75 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.91 | 11.21 |
| Mass (M⊕) | 1.00 | 156.05 | 317.83 |
| Density (g/cm³) | 5.51 | 0.88 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 59.26 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 156.054 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 44737596
Gaia DR2
Gaia DR2 5082914338199586560
Gaia DR3
Gaia DR3 5082914338199586560
System
HATS-75
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.79 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0327 AU.
Transit Fingerprint
Depth
2.634 %
Duration
1.913 h
Impact parameter b
0.406
Rp / R★
0.155500
Transit midpoint (BJD)
2,458,611.0549
Photometric dip
Transit produces a flux drop of 26,340 ppm lasting ≈ 1.91 h.
Extended Orbital Architecture
Planet / star radius ratio
0.155500
Semi-major axis / stellar radius
12.037
Impact parameter (b)
0.406
RV semi-amplitude (K)
99.200 m/s
Transit mid-time (BJD)
2,458,611.0549
Angular separation (arcsec)
0.16800
Eq. Temperature
772K
(499 °C)
Insolation (S⊕)
59.26
Earth = 1.00
Earth Similarity (ESI)
0.202
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
Jord Aacute N et al. 2022Instrument
Apogee 4K CCD Sensor
Publication
2022-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at HATSouth (3 shown).
Host System: HATS-75
Spectral Class
K-type orange
Effective Temperature
3,790 K — cooler than the Sun (5,778 K)
Estimated Age
14.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.585 R☉
Stellar Mass
0.602 M☉
Metallicity [Fe/H]
0.52
Extended Stellar Properties
Surface gravity (log g)
4.683 dex
Stellar density
4.239 g/cm³
Systemic radial velocity
40.00 km/s
Rotation period
35.04 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.100 mas
Total Proper Motion
12.990 mas/yr
PM Right Ascension
12.87 mas/yr
PM Declination
-1.75 mas/yr
Galactic Cartesian (pc)
x = 0.439 · y = 0.790 · z = -0.429
Equatorial (J2000)
RA 60.94939° · Dec -25.40892°
Galactic ℓ, b
221.956° · -47.107°
Ecliptic λ, β
51.617° · -45.053°
HTM-20 index
1026663152
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