Key parameters at a glance
- A radius of 5.25 Earth radii
- A mass of 24.00 Earth masses
- Surface gravity around 0.87 g
- An orbital period of 525.800 days
- Semi-major axis 1.1800 AU
- Equilibrium temperature 185 K (-88 °C)
- Distance from Earth 28.69 light-years
- Earth Similarity Index 0.398
- Travel time at Voyager 1 speed 505,975 years
1 sibling around HD 192310
HD 192310 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 192310 b | Neptune-like | 4.27 | 16.90 | 74.720 | 355 | 2011 |
| HD 192310 c this | Neptune-like | 5.25 | 24.00 | 525.800 | 185 | 2011 |
HD 192310 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#348of 574
top 60.5%
This planet
5.25R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 192310 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.25 | 11.21 |
| Mass (M⊕) | 1.00 | 24.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.87 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 24.000 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 24.000 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
HD
HD 192310
HIP
HIP 99825
TIC
TIC 326096771
Gaia DR2
Gaia DR2 6847167606385195648
Gaia DR3
Gaia DR3 6847167606385195648
System
HD 192310
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.44 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.1800 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
2.270 m/s
Transit mid-time (BJD)
2,455,256.0000
Long. of periastron (ω)
110.00°
Angular separation (arcsec)
134.00000
Eq. Temperature
185K
(-88 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.398
0 = alien, 1 = Earth-identical
Insufficient insolation data — surface water would be frozen.
Discovery Paper
Primary reference
Pepe et al. 2011Instrument
HARPS Spectrograph
Publication
2011-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at La Silla Observatory (10 shown).
Host System: HD 192310
Spectral Class
K-type orange
Effective Temperature
5,166 K — cooler than the Sun (5,778 K)
Estimated Age
7.81 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.858 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
2.146 g/cm³
Systemic radial velocity
-54.22 km/s
Rotational v·sin i
3.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
113.648 mas
Total Proper Motion
1,255.650 mas/yr
PM Right Ascension
1,242.53 mas/yr
PM Declination
-181.04 mas/yr
Galactic Cartesian (pc)
x = 0.496 · y = -0.740 · z = -0.455
Equatorial (J2000)
RA 303.82847° · Dec -27.03376°
Galactic ℓ, b
15.626° · -29.403°
Ecliptic λ, β
299.973° · -7.047°
HTM-20 index
-1487542827
Observation Record
Photometric series
1
RV measurements
1
Stellar spectra
5
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