Key parameters at a glance
- A radius of 6.31 Earth radii
- A mass of 38.14 Earth masses
- Surface gravity around 0.96 g
- An orbital period of 3.185 days
- Semi-major axis 0.0401 AU
- Equilibrium temperature 1,084 K (811 °C)
- Distance from Earth 785.08 light-years
- Earth Similarity Index 0.157
- Travel time at Voyager 1 speed 13,844,891 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-7 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#254of 574
top 44.1%
This planet
6.31R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HATS-7 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.31 | 11.21 |
| Mass (M⊕) | 1.00 | 38.14 | 317.83 |
| Density (g/cm³) | 5.51 | 0.83 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.96 | 2.53 |
| Insolation (S⊕) | 1.00 | 211.62 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 38.140 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 220029715
Gaia DR2
Gaia DR2 6288858347945925504
Gaia DR3
Gaia DR3 6288858347945925504
System
HATS-7
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.19 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0401 AU.
Transit Fingerprint
Depth
0.492 %
Duration
2.299 h
Impact parameter b
0.390
Rp / R★
0.071100
Transit midpoint (BJD)
2,456,528.2970
Photometric dip
Transit produces a flux drop of 4,917 ppm lasting ≈ 2.30 h.
Extended Orbital Architecture
Planet / star radius ratio
0.071100
Semi-major axis / stellar radius
10.590
Impact parameter (b)
0.390
RV semi-amplitude (K)
18.400 m/s
Transit mid-time (BJD)
2,456,528.2970
Angular separation (arcsec)
0.16700
Eq. Temperature
1,084K
(811 °C)
Insolation (S⊕)
211.62
Earth = 1.00
Earth Similarity (ESI)
0.157
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
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
Bakos et al. 2015Instrument
Apogee 4K CCD Sensor
Publication
2015-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2015 at HATSouth (6 shown).
Host System: HATS-7
Spectral Class
K-type orange
Effective Temperature
4,985 K — cooler than the Sun (5,778 K)
Estimated Age
7.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.815 R☉
Stellar Mass
0.849 M☉
Metallicity [Fe/H]
0.25
Extended Stellar Properties
Surface gravity (log g)
4.545 dex
Stellar density
2.220 g/cm³
Systemic radial velocity
9.44 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
4.126 mas
Total Proper Motion
56.623 mas/yr
PM Right Ascension
-43.13 mas/yr
PM Declination
-36.69 mas/yr
Galactic Cartesian (pc)
x = -0.817 · y = -0.450 · z = -0.362
Equatorial (J2000)
RA 208.85675° · Dec -21.20786°
Galactic ℓ, b
322.307° · 39.244°
Ecliptic λ, β
214.283° · -8.797°
HTM-20 index
275627179
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