Key parameters at a glance
- A radius of 13.20 Earth radii
- A mass of 851.78 Earth masses
- Surface gravity around 4.89 g
- An orbital period of 3,361.000 days
- Semi-major axis 4.1000 AU
- Distance from Earth 123.17 light-years
- Earth Similarity Index 0.389
- Travel time at Voyager 1 speed 2,172,135 years
1 sibling around HAT-P-11
HAT-P-11 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HAT-P-11 b | Neptune-like | 4.36 | 25.00 | 4.888 | 838 | 2008 |
| HAT-P-11 c this | Gas Giant | 13.20 | 851.78 | 3,361.000 | — | 2018 |
HAT-P-11 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#847of 1771
top 47.8%
This planet
13.20R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-11 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.20 | 11.21 |
| Mass (M⊕) | 1.00 | 851.78 | 317.83 |
| Density (g/cm³) | 5.51 | 2.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.89 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 851.780 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 507.000 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 97657
TIC
TIC 28230919
Gaia DR2
Gaia DR2 2086512227851023872
Gaia DR3
Gaia DR3 2086512227851023872
System
HAT-P-11
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 9.20 Earth years on a highly eccentric trajectory at a mean orbital distance of 4.1000 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
30.100 m/s
Transit mid-time (BJD)
2,456,746.0000
Long. of periastron (ω)
142.10°
Angular separation (arcsec)
109.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.389
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Yee et al. 2018Instrument
HIRES Spectrometer
Publication
2018-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at W. M. Keck Observatory (12 shown).
Host System: HAT-P-11
Spectral Class
K-type orange
Effective Temperature
4,653 K — cooler than the Sun (5,778 K)
Estimated Age
2.69 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.683 R☉
Stellar Mass
0.811 M☉
Metallicity [Fe/H]
0.31
Extended Stellar Properties
Surface gravity (log g)
4.663 dex
Stellar density
3.700 g/cm³
Systemic radial velocity
-63.24 km/s
Rotational v·sin i
0.67 km/s
Rotation period
30.50 days
Activity index (log R'HK)
-4.350
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
26.451 mas
Total Proper Motion
264.869 mas/yr
PM Right Ascension
125.98 mas/yr
PM Declination
232.99 mas/yr
Galactic Cartesian (pc)
x = 0.311 · y = -0.591 · z = 0.744
Equatorial (J2000)
RA 297.71018° · Dec 48.08186°
Galactic ℓ, b
81.835° · 10.772°
Ecliptic λ, β
321.547° · 66.630°
HTM-20 index
2052377588
Observation Record
Photometric series
13
RV measurements
1
Archive notes
3
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