Key parameters at a glance
- A radius of 12.39 Earth radii
- A mass of 689.69 Earth masses
- Surface gravity around 4.50 g
- An orbital period of 1.747 days
- Semi-major axis 0.0271 AU
- Equilibrium temperature 1,505 K (1232 °C)
- Distance from Earth 3,716.71 light-years
- Earth Similarity Index 0.102
- Travel time at Voyager 1 speed 65,544,190 years
HATS-15 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1337of 1771
top 75.4%
This planet
12.39R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-15 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.39 | 11.21 |
| Mass (M⊕) | 1.00 | 689.69 | 317.83 |
| Density (g/cm³) | 5.51 | 1.97 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.50 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,201.34 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 689.691 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 271898990
Gaia DR2
Gaia DR2 6858088299469303168
Gaia DR3
Gaia DR3 6858088299469303168
System
HATS-15
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.75 Earth days (0.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0271 AU.
Transit Fingerprint
Depth
1.678 %
Duration
2.270 h
Impact parameter b
0.317
Rp / R★
0.122900
Transit midpoint (BJD)
2,456,387.2116
Photometric dip
Transit produces a flux drop of 16,780 ppm lasting ≈ 2.27 h.
Extended Orbital Architecture
Planet / star radius ratio
0.122900
Semi-major axis / stellar radius
6.330
Impact parameter (b)
0.317
RV semi-amplitude (K)
399.000 m/s
Transit mid-time (BJD)
2,456,387.2116
Angular separation (arcsec)
0.02380
Eq. Temperature
1,505K
(1232 °C)
Insolation (S⊕)
2,201.34
Earth = 1.00
Earth Similarity (ESI)
0.102
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
Ciceri et al. 2016Instrument
Apogee 4K CCD Sensor
Publication
2016-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at HATSouth (12 shown).
Host System: HATS-15
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,311 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.922 R☉
Stellar Mass
0.871 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.449 dex
Stellar density
1.570 g/cm³
Systemic radial velocity
-54.15 km/s
Rotational v·sin i
4.18 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
0.854 mas
Total Proper Motion
18.305 mas/yr
PM Right Ascension
18.24 mas/yr
PM Declination
1.57 mas/yr
Galactic Cartesian (pc)
x = 0.620 · y = -0.711 · z = -0.333
Equatorial (J2000)
RA 311.09200° · Dec -19.43753°
Galactic ℓ, b
26.561° · -33.282°
Ecliptic λ, β
308.310° · -1.296°
HTM-20 index
-2128805635
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