Key parameters at a glance
- A radius of 11.88 Earth radii
- A mass of 616.59 Earth masses
- Surface gravity around 4.37 g
- An orbital period of 10.864 days
- Semi-major axis 0.0965 AU
- Equilibrium temperature 904 K (631 °C)
- Distance from Earth 627.90 light-years
- Earth Similarity Index 0.183
- Travel time at Voyager 1 speed 11,073,060 years
HAT-P-15 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1547of 1771
top 87.3%
This planet
11.88R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-15 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.88 | 11.21 |
| Mass (M⊕) | 1.00 | 616.59 | 317.83 |
| Density (g/cm³) | 5.51 | 1.96 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.37 | 2.53 |
| Insolation (S⊕) | 1.00 | 79.76 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 616.590 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 353459965
Gaia DR2
Gaia DR2 179498266829041664
Gaia DR3
Gaia DR3 179498266829041664
System
HAT-P-15
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.86 Earth days (3.0% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0965 AU.
Transit Fingerprint
Depth
1.000 %
Duration
5.484 h
Impact parameter b
0.342
Rp / R★
0.101900
Transit midpoint (BJD)
2,456,159.4442
Photometric dip
Transit produces a flux drop of 10,000 ppm lasting ≈ 5.48 h.
Extended Orbital Architecture
Planet / star radius ratio
0.101900
Semi-major axis / stellar radius
19.250
Impact parameter (b)
0.342
RV semi-amplitude (K)
180.600 m/s
Transit mid-time (BJD)
2,456,159.4442
Long. of periastron (ω)
262.00°
Sky-projected obliquity (λ)
13.00°
Angular separation (arcsec)
0.50100
Eq. Temperature
904K
(631 °C)
Insolation (S⊕)
79.76
Earth = 1.00
Earth Similarity (ESI)
0.183
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Kovacs et al. 2010Instrument
2K CCD Sensor
Publication
2010-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at HATNet (12 shown).
Host System: HAT-P-15
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,568 K — cooler than the Sun (5,778 K)
Estimated Age
6.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.070 R☉
Stellar Mass
1.000 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.380 dex
Stellar density
1.140 g/cm³
Systemic radial velocity
31.76 km/s
Rotational v·sin i
1.53 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.166 mas
Total Proper Motion
17.187 mas/yr
PM Right Ascension
14.40 mas/yr
PM Declination
-9.38 mas/yr
Galactic Cartesian (pc)
x = 0.311 · y = 0.707 · z = 0.636
Equatorial (J2000)
RA 66.24814° · Dec 39.46060°
Galactic ℓ, b
161.559° · -6.892°
Ecliptic λ, β
70.958° · 17.578°
HTM-20 index
-1944697636
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