Key parameters at a glance
- A radius of 8.57 Earth radii
- A mass of 112.19 Earth masses
- Surface gravity around 1.53 g
- An orbital period of 4.148 days
- Semi-major axis 0.0452 AU
- Equilibrium temperature 835 K (562 °C)
- Distance from Earth 1,058.09 light-years
- Earth Similarity Index 0.198
- Travel time at Voyager 1 speed 18,659,460 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-49 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#116of 574
top 20.0%
This planet
8.57R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HATS-49 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.57 | 11.21 |
| Mass (M⊕) | 1.00 | 112.19 | 317.83 |
| Density (g/cm³) | 5.51 | 0.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.53 | 2.53 |
| Insolation (S⊕) | 1.00 | 80.45 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 112.194 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 281541545
Gaia DR2
Gaia DR2 4919770108539385472
Gaia DR3
Gaia DR3 4919770108539385472
System
HATS-49
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.15 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0452 AU.
Transit Fingerprint
Depth
1.289 %
Duration
2.346 h
Impact parameter b
0.420
Rp / R★
0.112700
Transit midpoint (BJD)
2,457,105.1648
Photometric dip
Transit produces a flux drop of 12,887 ppm lasting ≈ 2.35 h.
Extended Orbital Architecture
Planet / star radius ratio
0.112700
Semi-major axis / stellar radius
13.910
Impact parameter (b)
0.420
RV semi-amplitude (K)
55.900 m/s
Transit mid-time (BJD)
2,457,105.1648
Angular separation (arcsec)
0.13900
Eq. Temperature
835K
(562 °C)
Insolation (S⊕)
80.45
Earth = 1.00
Earth Similarity (ESI)
0.198
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-49
Spectral Class
K-type orange
Effective Temperature
4,405 K — cooler than the Sun (5,778 K)
Estimated Age
10.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.698 R☉
Stellar Mass
0.713 M☉
Metallicity [Fe/H]
0.21
Extended Stellar Properties
Surface gravity (log g)
4.604 dex
Stellar density
2.961 g/cm³
Systemic radial velocity
8.10 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
3.054 mas
Total Proper Motion
43.376 mas/yr
PM Right Ascension
42.58 mas/yr
PM Declination
8.26 mas/yr
Galactic Cartesian (pc)
x = 0.551 · y = 0.064 · z = -0.832
Equatorial (J2000)
RA 6.61359° · Dec -56.34428°
Galactic ℓ, b
309.953° · -60.442°
Ecliptic λ, β
333.658° · -52.100°
HTM-20 index
-541980746
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