Key parameters at a glance
- A radius of 13.92 Earth radii
- A mass of 111.87 Earth masses
- Surface gravity around 0.58 g
- An orbital period of 4.301 days
- Semi-major axis 0.0507 AU
- Equilibrium temperature 1,108 K (835 °C)
- Distance from Earth 1,134.53 light-years
- Earth Similarity Index 0.099
- Travel time at Voyager 1 speed 20,007,500 years
1 sibling around HAT-P-44
HAT-P-44 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HAT-P-44 b this | Gas Giant | 13.92 | 111.87 | 4.301 | 1,108 | 2014 |
| HAT-P-44 c | Gas Giant | 13.00 | 1,271.30 | 872.200 | — | 2014 |
HAT-P-44 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#455of 1771
top 25.6%
This planet
13.92R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-44 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.92 | 11.21 |
| Mass (M⊕) | 1.00 | 111.87 | 317.83 |
| Density (g/cm³) | 5.51 | 0.23 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.58 | 2.53 |
| Insolation (S⊕) | 1.00 | 185.12 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 111.871 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 168699373
Gaia DR2
Gaia DR2 1506159170017461888
Gaia DR3
Gaia DR3 1506159170017461888
System
HAT-P-44
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.30 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0507 AU.
Transit Fingerprint
Depth
2.205 %
Duration
3.125 h
Impact parameter b
0.172
Rp / R★
0.134300
Transit midpoint (BJD)
2,455,696.9370
Photometric dip
Transit produces a flux drop of 22,050 ppm lasting ≈ 3.12 h.
Extended Orbital Architecture
Planet / star radius ratio
0.134300
Semi-major axis / stellar radius
11.490
Impact parameter (b)
0.172
RV semi-amplitude (K)
45.900 m/s
Transit mid-time (BJD)
2,455,696.9370
Long. of periastron (ω)
113.00°
Angular separation (arcsec)
0.14600
Eq. Temperature
1,108K
(835 °C)
Insolation (S⊕)
185.12
Earth = 1.00
Earth Similarity (ESI)
0.099
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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. 2014Instrument
2K CCD Sensor
Publication
2014-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2014 at HATNet (3 shown).
Host System: HAT-P-44
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,295 K — cooler than the Sun (5,778 K)
Estimated Age
7.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.949 R☉
Stellar Mass
0.942 M☉
Metallicity [Fe/H]
0.33
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
1.100 g/cm³
Systemic radial velocity
-33.45 km/s
Rotational v·sin i
0.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.846 mas
Total Proper Motion
31.681 mas/yr
PM Right Ascension
-29.68 mas/yr
PM Declination
11.08 mas/yr
Galactic Cartesian (pc)
x = -0.571 · y = -0.373 · z = 0.732
Equatorial (J2000)
RA 213.14386° · Dec 47.01478°
Galactic ℓ, b
89.603° · 64.520°
Ecliptic λ, β
185.104° · 55.029°
HTM-20 index
1613212822
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