Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,875.19 Earth masses
- Surface gravity around 11.45 g
- An orbital period of 990.000 days
- Semi-major axis 2.1200 AU
- Distance from Earth 195.23 light-years
- Earth Similarity Index 0.437
- Travel time at Voyager 1 speed 3,442,946 years
Context from the literature
HD 16175 b is an exoplanet located approximately 195.7 light-years away in the constellation of Andromeda, orbiting the star HD 16175. This planet has a minimum mass 4.8 times that of Jupiter; the true mass was initially unknown since the inclination of the orbit was unknown. This planet orbits at about 2.2 astronomical units, taking 2.73 years to revolve around the star. The orbit of the planet is highly elliptical with an eccentricity of 0.64. In 2023, the inclination and true mass of HD 16175 b were determined via astrometry.
Excerpted from Wikipedia · full article
HD 16175 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 16175 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,875.19 | 317.83 |
| Density (g/cm³) | 5.51 | 4.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 11.45 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,875.188 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 1,620.933 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 16175
HIP
HIP 12191
TIC
TIC 422922274
Gaia DR2
Gaia DR2 340028235795364864
Gaia DR3
Gaia DR3 340028235795364864
System
HD 16175
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 2.71 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.1200 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.437
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
Peek et al. 2009Instrument
Hamilton Echelle Spectrograph
Publication
2009-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at Lick Observatory (5 shown).
Host System: HD 16175
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,981 K — hotter than the Sun (5,778 K)
Estimated Age
3.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.720 R☉
Stellar Mass
1.630 M☉
Metallicity [Fe/H]
0.30
Extended Stellar Properties
Surface gravity (log g)
4.180 dex
Stellar density
0.240 g/cm³
Systemic radial velocity
21.83 km/s
Rotational v·sin i
4.80 km/s
Rotation period
19.70 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
16.678 mas
Total Proper Motion
56.695 mas/yr
PM Right Ascension
-38.84 mas/yr
PM Declination
-41.31 mas/yr
Galactic Cartesian (pc)
x = 0.575 · y = 0.470 · z = 0.670
Equatorial (J2000)
RA 39.25774° · Dec 42.06245°
Galactic ℓ, b
143.084° · -16.640°
Ecliptic λ, β
50.503° · 25.327°
HTM-20 index
-164259333
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