Key parameters at a glance
- A radius of 11.96 Earth radii
- A mass of 177.98 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 2.744 days
- Semi-major axis 0.0365 AU
- Equilibrium temperature 1,161 K (888 °C)
- Distance from Earth 1,454.77 light-years
- Earth Similarity Index 0.115
- Travel time at Voyager 1 speed 25,654,866 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-44 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1520of 1771
top 85.8%
This planet
11.96R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-44 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.96 | 11.21 |
| Mass (M⊕) | 1.00 | 177.98 | 317.83 |
| Density (g/cm³) | 5.51 | 0.56 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 306.42 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 177.985 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 32499655
Gaia DR2
Gaia DR2 2907577758566408960
Gaia DR3
Gaia DR3 2907577758566408960
System
HATS-44
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.74 Earth days (0.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0365 AU.
Transit Fingerprint
Depth
1.385 %
Duration
1.651 h
Impact parameter b
0.862
Rp / R★
0.129000
Transit midpoint (BJD)
2,456,931.1138
Photometric dip
Transit produces a flux drop of 13,852 ppm lasting ≈ 1.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.129000
Semi-major axis / stellar radius
9.240
Impact parameter (b)
0.862
RV semi-amplitude (K)
90.000 m/s
Transit mid-time (BJD)
2,456,931.1138
Angular separation (arcsec)
0.08180
Eq. Temperature
1,161K
(888 °C)
Insolation (S⊕)
306.42
Earth = 1.00
Earth Similarity (ESI)
0.115
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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
Brahm et al. 2018Instrument
Apogee 4K CCD Sensor
Publication
2018-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at HATSouth (12 shown).
Host System: HATS-44
Spectral Class
K-type orange
Effective Temperature
5,080 K — cooler than the Sun (5,778 K)
Estimated Age
9.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.847 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
0.32
Extended Stellar Properties
Surface gravity (log g)
4.514 dex
Stellar density
1.980 g/cm³
Systemic radial velocity
44.08 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
2.213 mas
Total Proper Motion
2.175 mas/yr
PM Right Ascension
-2.16 mas/yr
PM Declination
0.26 mas/yr
Galactic Cartesian (pc)
x = 0.087 · y = 0.879 · z = -0.469
Equatorial (J2000)
RA 84.32676° · Dec -27.97258°
Galactic ℓ, b
232.000° · -27.627°
Ecliptic λ, β
81.977° · -51.254°
HTM-20 index
1067984023
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