Key parameters at a glance
- A radius of 13.38 Earth radii
- A mass of 213.58 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 3.181 days
- Semi-major axis 0.0413 AU
- Equilibrium temperature 1,253 K (980 °C)
- Distance from Earth 1,746.18 light-years
- Earth Similarity Index 0.100
- Travel time at Voyager 1 speed 30,793,949 years
HATS-28 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#783of 1771
top 44.2%
This planet
13.38R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-28 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.38 | 11.21 |
| Mass (M⊕) | 1.00 | 213.58 | 317.83 |
| Density (g/cm³) | 5.51 | 0.48 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 213.582 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 6663331
Gaia DR2
Gaia DR2 6661242835829891584
Gaia DR3
Gaia DR3 6661242835829891584
System
HATS-28
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.18 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0413 AU.
Transit Fingerprint
Depth
2.119 %
Duration
2.354 h
Impact parameter b
0.643
Rp / R★
0.133100
Transit midpoint (BJD)
2,457,034.2830
Photometric dip
Transit produces a flux drop of 21,193 ppm lasting ≈ 2.35 h.
Extended Orbital Architecture
Planet / star radius ratio
0.133100
Semi-major axis / stellar radius
9.630
Impact parameter (b)
0.643
RV semi-amplitude (K)
97.000 m/s
Transit mid-time (BJD)
2,457,034.2830
Angular separation (arcsec)
0.07720
Eq. Temperature
1,253K
(980 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.100
0 = alien, 1 = Earth-identical
Insufficient insolation data — 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
Espinoza et al. 2016Instrument
Apogee 4K CCD Sensor
Publication
2016-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at HATSouth (12 shown).
Host System: HATS-28
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,498 K — cooler than the Sun (5,778 K)
Estimated Age
6.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.922 R☉
Stellar Mass
0.929 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.476 dex
Stellar density
1.670 g/cm³
Systemic radial velocity
-8.65 km/s
Rotational v·sin i
2.60 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
1.839 mas
Total Proper Motion
12.504 mas/yr
PM Right Ascension
11.10 mas/yr
PM Declination
-5.76 mas/yr
Galactic Cartesian (pc)
x = 0.163 · y = -0.634 · z = -0.756
Equatorial (J2000)
RA 284.39976° · Dec -49.13851°
Galactic ℓ, b
347.451° · -21.131°
Ecliptic λ, β
280.445° · -26.220°
HTM-20 index
-643592566
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