Key parameters at a glance
- A radius of 8.97 Earth radii
- A mass of 77.23 Earth masses
- Surface gravity around 0.96 g
- An orbital period of 3.132 days
- Semi-major axis 0.0377 AU
- Equilibrium temperature 955 K (681 °C)
- Distance from Earth 859.78 light-years
- Earth Similarity Index 0.156
- Travel time at Voyager 1 speed 15,162,159 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-48 A b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#93of 574
top 16.0%
This planet
8.97R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HATS-48 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.97 | 11.21 |
| Mass (M⊕) | 1.00 | 77.23 | 317.83 |
| Density (g/cm³) | 5.51 | 0.59 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.96 | 2.53 |
| Insolation (S⊕) | 1.00 | 137.60 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 77.233 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 201642601
Gaia DR2
Gaia DR2 6638412919991750912
Gaia DR3
Gaia DR3 6638412919991750912
System
HATS-48
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.13 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0377 AU.
Transit Fingerprint
Depth
1.492 %
Duration
2.346 h
Impact parameter b
0.083
Rp / R★
0.114800
Transit midpoint (BJD)
2,457,100.5502
Photometric dip
Transit produces a flux drop of 14,916 ppm lasting ≈ 2.35 h.
Extended Orbital Architecture
Planet / star radius ratio
0.114800
Semi-major axis / stellar radius
11.330
Impact parameter (b)
0.083
RV semi-amplitude (K)
41.800 m/s
Transit mid-time (BJD)
2,457,100.5502
Angular separation (arcsec)
0.14300
Eq. Temperature
955K
(681 °C)
Insolation (S⊕)
137.60
Earth = 1.00
Earth Similarity (ESI)
0.156
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-48 A
Spectral Class
K-type orange
Effective Temperature
4,546 K — cooler than the Sun (5,778 K)
Estimated Age
11.97 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.715 R☉
Stellar Mass
0.728 M☉
Metallicity [Fe/H]
0.19
Extended Stellar Properties
Surface gravity (log g)
4.591 dex
Stellar density
2.804 g/cm³
Systemic radial velocity
-22.46 km/s
Rotational v·sin i
0.73 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
3.765 mas
Total Proper Motion
6.895 mas/yr
PM Right Ascension
3.12 mas/yr
PM Declination
6.15 mas/yr
Galactic Cartesian (pc)
x = 0.162 · y = -0.480 · z = -0.862
Equatorial (J2000)
RA 288.67200° · Dec -59.57935°
Galactic ℓ, b
337.030° · -26.030°
Ecliptic λ, β
281.691° · -36.896°
HTM-20 index
-1049856634
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