Key parameters at a glance
- A radius of 14.26 Earth radii
- A mass of 270.46 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 2.916 days
- Semi-major axis 0.0438 AU
- Equilibrium temperature 1,740 K (1467 °C)
- Distance from Earth 804.99 light-years
- Earth Similarity Index 0.061
- Travel time at Voyager 1 speed 14,195,921 years
1 sibling around HAT-P-13
HAT-P-13 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-13 b this | Gas Giant | 14.26 | 270.46 | 2.916 | 1,740 | 2009 |
| HAT-P-13 c | Gas Giant | 12.30 | 4,538.42 | 446.270 | 340 | 2009 |
HAT-P-13 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#327of 1771
top 18.4%
This planet
14.26R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-13 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.26 | 11.21 |
| Mass (M⊕) | 1.00 | 270.46 | 317.83 |
| Density (g/cm³) | 5.51 | 0.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,978.52 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 270.462 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 20096620
Gaia DR2
Gaia DR2 1014520826353577088
Gaia DR3
Gaia DR3 1014520826353577088
System
HAT-P-13
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.92 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0438 AU.
Transit Fingerprint
Depth
0.726 %
Duration
3.287 h
Impact parameter b
0.679
Rp / R★
0.083890
Transit midpoint (BJD)
2,454,779.9298
Photometric dip
Transit produces a flux drop of 7,258 ppm lasting ≈ 3.29 h.
Extended Orbital Architecture
Planet / star radius ratio
0.083890
Semi-major axis / stellar radius
5.893
Impact parameter (b)
0.679
RV semi-amplitude (K)
106.040 m/s
Transit mid-time (BJD)
2,454,779.9298
Long. of periastron (ω)
210.00°
Sky-projected obliquity (λ)
1.90°
Angular separation (arcsec)
0.17800
Eq. Temperature
1,740K
(1467 °C)
Insolation (S⊕)
1,978.52
Earth = 1.00
Earth Similarity (ESI)
0.061
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Bakos et al. 2009Instrument
2K CCD Sensor
Publication
2009-12
Observation locale
Ground
Host System: HAT-P-13
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,653 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.756 R☉
Stellar Mass
1.320 M☉
Metallicity [Fe/H]
0.46
Extended Stellar Properties
Surface gravity (log g)
4.070 dex
Stellar density
0.344 g/cm³
Systemic radial velocity
14.69 km/s
Rotational v·sin i
1.66 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.023 mas
Total Proper Motion
35.734 mas/yr
PM Right Ascension
-24.14 mas/yr
PM Declination
-26.35 mas/yr
Galactic Cartesian (pc)
x = -0.434 · y = 0.520 · z = 0.736
Equatorial (J2000)
RA 129.88238° · Dec 47.35191°
Galactic ℓ, b
172.498° · 37.542°
Ecliptic λ, β
119.441° · 27.907°
HTM-20 index
-2110719154
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