Key parameters at a glance
- A radius of 12.72 Earth radii
- A mass of 180.85 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 3.653 days
- Semi-major axis 0.0466 AU
- Equilibrium temperature 1,182 K (909 °C)
- Distance from Earth 979.72 light-years
- Earth Similarity Index 0.108
- Travel time at Voyager 1 speed 17,277,369 years
HAT-P-25 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1127of 1771
top 63.6%
This planet
12.72R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-25 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.72 | 11.21 |
| Mass (M⊕) | 1.00 | 180.85 | 317.83 |
| Density (g/cm³) | 5.51 | 0.48 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 325.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 180.845 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 180.845 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 180.933 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
TIC
TIC 35022727
Gaia DR2
Gaia DR2 111322601672419712
Gaia DR3
Gaia DR3 111322601672419712
System
HAT-P-25
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.65 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0466 AU.
Transit Fingerprint
Depth
0.016 %
Duration
2.813 h
Impact parameter b
0.347
Rp / R★
0.126900
Transit midpoint (BJD)
2,457,759.3931
Photometric dip
Transit produces a flux drop of 161 ppm lasting ≈ 2.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.126900
Semi-major axis / stellar radius
10.900
Impact parameter (b)
0.347
RV semi-amplitude (K)
74.500 m/s
Transit mid-time (BJD)
2,457,759.3931
Long. of periastron (ω)
287.00°
Angular separation (arcsec)
0.15500
Eq. Temperature
1,182K
(909 °C)
Insolation (S⊕)
325.00
Earth = 1.00
Earth Similarity (ESI)
0.108
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
Quinn et al. 2010Instrument
2K CCD Sensor
Publication
2012-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at HATNet (12 shown).
Host System: HAT-P-25
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,519 K — cooler than the Sun (5,778 K)
Estimated Age
3.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.919 R☉
Stellar Mass
1.012 M☉
Metallicity [Fe/H]
0.29
Extended Stellar Properties
Surface gravity (log g)
4.516 dex
Stellar density
1.840 g/cm³
Systemic radial velocity
-12.51 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.301 mas
Total Proper Motion
19.146 mas/yr
PM Right Ascension
13.49 mas/yr
PM Declination
-13.59 mas/yr
Galactic Cartesian (pc)
x = 0.600 · y = 0.677 · z = 0.426
Equatorial (J2000)
RA 48.43547° · Dec 25.19735°
Galactic ℓ, b
159.314° · -27.443°
Ecliptic λ, β
52.782° · 6.967°
HTM-20 index
637635752
Similar Worlds
HR 810 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.70 R⊕ · 56.5 ly
HD 120084 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.70 R⊕ · 336.1 ly
HD 125612 d
Gas Giant · G-type yellow (Sun-like)
Radius 12.70 R⊕ · 187.9 ly
HD 147018 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.70 R⊕ · 131.9 ly
HD 11977 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.70 R⊕ · 221.6 ly
HD 126614 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.70 R⊕ · 238.4 ly