Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,655.82 Earth masses
- Surface gravity around 10.11 g
- An orbital period of 501.750 days
- Semi-major axis 1.1600 AU
- Distance from Earth 1,214.62 light-years
- Earth Similarity Index 0.433
- Travel time at Voyager 1 speed 21,419,845 years
Context from the literature
HD 240210 b is a 6.9 Jupiter-mass exoplanet discovered on June 10, 2009 by Niedzielski Etal. using the Hobby-Eberly Telescope. It orbits the K3 giant star HD 240210 in the constellation of Cassiopeia. Its average orbital separation is at 1.33 Astronomical Units away from its star with a year of 501.75 days.
Excerpted from Wikipedia · full article
HD 240210 b 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 240210 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,655.82 | 317.83 |
| Density (g/cm³) | 5.51 | 4.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 10.11 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 1,655.820 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 240210
TIC
TIC 315415155
Gaia DR2
Gaia DR2 2009148596857820160
Gaia DR3
Gaia DR3 2009148596857820160
System
HD 240210
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.37 Earth years on a mildly elliptical path at a mean orbital distance of 1.1600 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.433
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Niedzielski et al. 2009Instrument
High Resolution Spectrograph
Publication
2009-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at McDonald Observatory (3 shown).
Host System: HD 240210
Spectral Class
K-type orange
Effective Temperature
4,297 K — cooler than the Sun (5,778 K)
Estimated Age
5.08 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
25.457 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
-0.18
Extended Stellar Properties
Surface gravity (log g)
2.310 dex
Systemic radial velocity
8.80 km/s
Rotational v·sin i
1.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.657 mas
Total Proper Motion
19.732 mas/yr
PM Right Ascension
18.49 mas/yr
PM Declination
6.88 mas/yr
Galactic Cartesian (pc)
x = 0.532 · y = -0.117 · z = 0.839
Equatorial (J2000)
RA 347.62192° · Dec 57.02948°
Galactic ℓ, b
109.494° · -3.185°
Ecliptic λ, β
23.092° · 54.699°
HTM-20 index
505551149
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