Key parameters at a glance
- A radius of 16.59 Earth radii
- A mass of 419.54 Earth masses
- Surface gravity around 1.52 g
- An orbital period of 3.853 days
- Semi-major axis 0.0524 AU
- Equilibrium temperature 1,675 K (1402 °C)
- Distance from Earth 898.10 light-years
- Earth Similarity Index 0.070
- Travel time at Voyager 1 speed 15,837,933 years
HAT-P-6 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#129of 1771
top 7.2%
This planet
16.59R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-6 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.59 | 11.21 |
| Mass (M⊕) | 1.00 | 419.54 | 317.83 |
| Density (g/cm³) | 5.51 | 0.56 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.52 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,099.44 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 419.536 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 176899385
Gaia DR2
Gaia DR2 1925321658546436352
Gaia DR3
Gaia DR3 1925321658551399040
System
HAT-P-6
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.85 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0524 AU.
Transit Fingerprint
Depth
0.870 %
Duration
3.506 h
Impact parameter b
0.602
Rp / R★
0.093400
Transit midpoint (BJD)
2,456,100.8833
Photometric dip
Transit produces a flux drop of 8,700 ppm lasting ≈ 3.51 h.
Extended Orbital Architecture
Planet / star radius ratio
0.093400
Semi-major axis / stellar radius
7.730
Impact parameter (b)
0.602
RV semi-amplitude (K)
115.500 m/s
Transit mid-time (BJD)
2,456,100.8833
Long. of periastron (ω)
94.10°
Sky-projected obliquity (λ)
165.00°
Angular separation (arcsec)
0.19000
Eq. Temperature
1,675K
(1402 °C)
Insolation (S⊕)
1,099.44
Earth = 1.00
Earth Similarity (ESI)
0.070
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
Noyes et al. 2008Instrument
2K CCD Sensor
Publication
2008-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2007 at HATNet (4 shown).
Host System: HAT-P-6
Spectral Class
F-type yellow-white
Effective Temperature
6,570 K — hotter than the Sun (5,778 K)
Estimated Age
2.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.620 R☉
Stellar Mass
1.790 M☉
Metallicity [Fe/H]
-0.13
Extended Stellar Properties
Surface gravity (log g)
4.220 dex
Stellar density
0.590 g/cm³
Systemic radial velocity
-22.70 km/s
Rotational v·sin i
7.80 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.604 mas
Total Proper Motion
20.317 mas/yr
PM Right Ascension
-20.08 mas/yr
PM Declination
3.12 mas/yr
Galactic Cartesian (pc)
x = 0.735 · y = -0.067 · z = 0.675
Equatorial (J2000)
RA 354.77409° · Dec 42.46599°
Galactic ℓ, b
108.963° · -18.435°
Ecliptic λ, β
15.727° · 40.253°
HTM-20 index
-1654491007
Observation Record
Photometric series
6
RV measurements
1
Emission spectra
3
Similar Worlds
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TOI-4379 b
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TOI-163 b
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WTS-1 b
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