Key parameters at a glance
- A radius of 12.20 Earth radii
- A mass of 5,500.34 Earth masses
- Surface gravity around 36.95 g
- An orbital period of 1,753.110 days
- Semi-major axis 2.8420 AU
- Distance from Earth 129.24 light-years
- Earth Similarity Index 0.311
- Travel time at Voyager 1 speed 2,279,106 years
1 sibling around HD 168443
HD 168443 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 168443 b | Gas Giant | 12.60 | 2,424.40 | 58.112 | — | 1998 |
| HD 168443 c this | Gas Giant | 12.20 | 5,500.34 | 1,753.110 | — | 2000 |
HD 168443 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 | HD 168443 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.20 | 11.21 |
| Mass (M⊕) | 1.00 | 5,500.34 | 317.83 |
| Density (g/cm³) | 5.51 | 16.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 36.95 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5,500.338 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 5,464.221 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 168443
HIP
HIP 89844
TIC
TIC 16465196
Gaia DR2
Gaia DR2 4157584215800708736
Gaia DR3
Gaia DR3 4157584215800708736
System
HD 168443
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 4.80 Earth years on a mildly elliptical path at a mean orbital distance of 2.8420 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
298.855 m/s
Transit mid-time (BJD)
2,455,599.4100
Long. of periastron (ω)
65.60°
Angular separation (arcsec)
71.70000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.311
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
Marcy et al. 2001Instrument
HIRES Spectrometer
Publication
2001-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2000 at W. M. Keck Observatory (4 shown).
Host System: HD 168443
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,491 K — cooler than the Sun (5,778 K)
Estimated Age
11.08 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.711 R☉
Stellar Mass
0.980 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
3.988 dex
Stellar density
0.292 g/cm³
Systemic radial velocity
-0.05 km/s
Rotational v·sin i
2.20 km/s
Activity index (log R'HK)
-5.120
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
25.208 mas
Total Proper Motion
242.301 mas/yr
PM Right Ascension
-91.69 mas/yr
PM Declination
-224.29 mas/yr
Galactic Cartesian (pc)
x = 0.086 · y = -0.982 · z = -0.167
Equatorial (J2000)
RA 275.01599° · Dec -9.59669°
Galactic ℓ, b
20.814° · 2.507°
Ecliptic λ, β
275.088° · 13.754°
HTM-20 index
1451828655
Observation Record
Photometric series
1
RV measurements
6
Stellar spectra
2
Archive notes
1
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