Key parameters at a glance
- A radius of 12.20 Earth radii
- A mass of 4,958.12 Earth masses
- Surface gravity around 33.31 g
- An orbital period of 25,000.000 days
- Semi-major axis 19.4000 AU
- Distance from Earth 102.18 light-years
- Earth Similarity Index 0.323
- Travel time at Voyager 1 speed 1,801,930 years
1 sibling around iot Dra
iot Dra 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 |
|---|---|---|---|---|---|---|
| iot Dra b | Gas Giant | 12.40 | 3,756.73 | 510.854 | — | 2002 |
| iot Dra c this | Gas Giant | 12.20 | 4,958.12 | 25,000.000 | — | 2022 |
iot Dra c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1410of 1771
top 79.6%
This planet
12.20R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | iot Dra c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.20 | 11.21 |
| Mass (M⊕) | 1.00 | 4,958.12 | 317.83 |
| Density (g/cm³) | 5.51 | 15.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 33.31 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 4,958.123 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 137759
HIP
HIP 75458
TIC
TIC 165722603
Gaia DR2
Gaia DR2 1614731957530945280
Gaia DR3
Gaia DR3 1614731957531452544
System
iot Dra
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 68.45 Earth years on a highly eccentric trajectory at a mean orbital distance of 19.4000 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.323
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Hill et al. 2021Instrument
HARPS Spectrograph
Publication
2021-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at La Silla Observatory (12 shown).
Host System: iot Dra
Spectral Class
K-type orange
Effective Temperature
4,504 K — cooler than the Sun (5,778 K)
Estimated Age
2.65 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
11.790 R☉
Stellar Mass
1.540 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
2.480 dex
Systemic radial velocity
-12.31 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
31.920 mas
Total Proper Motion
18.112 mas/yr
PM Right Ascension
-8.10 mas/yr
PM Declination
16.20 mas/yr
Galactic Cartesian (pc)
x = -0.323 · y = -0.402 · z = 0.857
Equatorial (J2000)
RA 231.23232° · Dec 58.96614°
Galactic ℓ, b
93.971° · 48.628°
Ecliptic λ, β
184.946° · 71.094°
HTM-20 index
1095359429
Observation Record
Photometric series
1
RV measurements
2
Archive notes
1
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