Key parameters at a glance
- A radius of 12.60 Earth radii
- A mass of 2,500.67 Earth masses
- Surface gravity around 15.75 g
- An orbital period of 9,295.974 days
- Semi-major axis 8.5400 AU
- Distance from Earth 203.56 light-years
- Earth Similarity Index 0.416
- Travel time at Voyager 1 speed 3,589,743 years
Context from the literature
HD 43197 is a star with an exoplanetary companion in the southern constellation of Canis Major. It has been given the proper name Amadioha, as selected by Nigeria during the NameExoWorlds campaign that celebrated the 100th anniversary of the IAU. Amadioha is the god of thunder in Igbo mythology. It has an apparent visual magnitude of 8.98, meaning this is a ninth magnitude star that is too dim to be visible to the naked eye. The system is located at a distance of 204 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +72 km/s. It made its closest approach some 583,000 years ago when it came to within 87 light-years.
Excerpted from Wikipedia · full article
1 sibling around HD 43197
HD 43197 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 43197 b | Gas Giant | 14.20 | 175.76 | 308.921 | — | 2010 |
| HD 43197 c this | Gas Giant | 12.60 | 2,500.67 | 9,295.974 | — | 2022 |
HD 43197 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1179of 1771
top 66.5%
This planet
12.60R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 43197 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.60 | 11.21 |
| Mass (M⊕) | 1.00 | 2,500.67 | 317.83 |
| Density (g/cm³) | 5.51 | 6.87 | 1.33 |
| Surface Gravity (g) | 1.00 | 15.75 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,500.674 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 43197
HIP
HIP 29550
TIC
TIC 37660988
Gaia DR2
Gaia DR2 2896745747966986240
Gaia DR3
Gaia DR3 2896745747966986240
System
HD 43197
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 25.45 Earth years on a mildly elliptical path at a mean orbital distance of 8.5400 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.416
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Feng et al. 2022Instrument
Multiple Instruments
Publication
2022-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at Multiple Observatories (12 shown).
Host System: HD 43197
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,508 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
1.000 R☉
Stellar Mass
0.960 M☉
Metallicity [Fe/H]
0.40
Extended Stellar Properties
Surface gravity (log g)
4.310 dex
Stellar density
1.120 g/cm³
Systemic radial velocity
72.51 km/s
Rotational v·sin i
2.18 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.994 mas
Total Proper Motion
148.516 mas/yr
PM Right Ascension
147.59 mas/yr
PM Declination
16.60 mas/yr
Galactic Cartesian (pc)
x = -0.051 · y = 0.865 · z = -0.498
Equatorial (J2000)
RA 93.39932° · Dec -29.89719°
Galactic ℓ, b
236.815° · -20.738°
Ecliptic λ, β
94.928° · -53.278°
HTM-20 index
-938185275
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