Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,808.45 Earth masses
- Surface gravity around 11.04 g
- An orbital period of 1,278.000 days
- Distance from Earth 478.14 light-years
- Earth Similarity Index 0.436
- Travel time at Voyager 1 speed 8,432,081 years
1 sibling around HD 99706
HD 99706 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 |
|---|---|---|---|---|---|---|
| HD 99706 b | Gas Giant | 13.70 | 390.93 | 841.000 | — | 2011 |
| HD 99706 c this | Gas Giant | 12.80 | 1,808.45 | 1,278.000 | — | 2018 |
HD 99706 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1063of 1771
top 60.0%
This planet
12.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 99706 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,808.45 | 317.83 |
| Density (g/cm³) | 5.51 | 4.74 | 1.33 |
| Surface Gravity (g) | 1.00 | 11.04 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 1,808.453 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 99706
HIP
HIP 55994
TIC
TIC 148680230
Gaia DR2
Gaia DR2 784227772318969472
Gaia DR3
Gaia DR3 784227772318969472
System
HD 99706
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 3.50 Earth years on a highly eccentric trajectory.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.436
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Bryan et al. 2016Instrument
HIRES Spectrometer
Publication
2016-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at W. M. Keck Observatory (12 shown).
Host System: HD 99706
Spectral Class
K-type orange
Effective Temperature
4,891 K — cooler than the Sun (5,778 K)
Estimated Age
2.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
5.400 R☉
Stellar Mass
1.720 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
3.200 dex
Systemic radial velocity
-30.07 km/s
Rotational v·sin i
0.89 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.793 mas
Total Proper Motion
98.579 mas/yr
PM Right Ascension
45.41 mas/yr
PM Declination
-87.50 mas/yr
Galactic Cartesian (pc)
x = -0.713 · y = 0.099 · z = 0.694
Equatorial (J2000)
RA 172.12616° · Dec 43.96620°
Galactic ℓ, b
162.267° · 66.297°
Ecliptic λ, β
152.783° · 36.707°
HTM-20 index
-1387733474
Similar Worlds
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Gas Giant · K-type orange
Radius 12.80 R⊕ · 268.8 ly
WASP-132 d
Gas Giant · K-type orange
Radius 12.80 R⊕ · 400.9 ly
gam Lib c
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HD 240210 b
Gas Giant · K-type orange
Radius 12.80 R⊕ · 1,214.6 ly
WISPIT 1 c
Gas Giant · K-type orange
Radius 12.80 R⊕ · 750.2 ly
Kepler-56 d
Gas Giant · K-type orange
Radius 12.80 R⊕ · 2,977.8 ly