Key parameters at a glance
- A radius of 3.61 Earth radii
- A mass of 12.70 Earth masses
- Surface gravity around 0.97 g
- An orbital period of 41.516 days
- Semi-major axis 0.2170 AU
- Distance from Earth 108.14 light-years
- Earth Similarity Index 0.577
- Travel time at Voyager 1 speed 1,907,065 years
- Almost certainly tidally locked to its host star given the close orbit
HIP 35173 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#132of 1978
top 6.6%
This planet
3.61R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HIP 35173 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.61 | 11.21 |
| Mass (M⊕) | 1.00 | 12.70 | 317.83 |
| Density (g/cm³) | 5.51 | 1.48 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.97 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 12.700 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 35173
TIC
TIC 50992589
Gaia DR2
Gaia DR2 3059948148669499008
Gaia DR3
Gaia DR3 3059948148669499008
System
HIP 35173
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 41.52 Earth days (11.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2170 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.577
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Feng et al. 2019Instrument
Carnegie Planet Finder Spectrograph
Publication
2019-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at Las Campanas Observatory (12 shown).
Host System: HIP 35173
Spectral Class
K-type orange
Effective Temperature
4,881 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.773 R☉
Stellar Mass
0.790 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.519 dex
Stellar density
2.111 g/cm³
Systemic radial velocity
11.08 km/s
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
30.132 mas
Total Proper Motion
116.671 mas/yr
PM Right Ascension
105.08 mas/yr
PM Declination
-50.69 mas/yr
Galactic Cartesian (pc)
x = -0.326 · y = 0.943 · z = -0.064
Equatorial (J2000)
RA 109.04493° · Dec -3.66613°
Galactic ℓ, b
219.027° · 3.815°
Ecliptic λ, β
111.185° · -25.715°
HTM-20 index
-1723908653
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