Key parameters at a glance
- A radius of 3.00 Earth radii
- A mass of 11.13 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 29.845 days
- Semi-major axis 0.1776 AU
- Equilibrium temperature 564 K (291 °C)
- Distance from Earth 154.24 light-years
- Earth Similarity Index 0.419
- Travel time at Voyager 1 speed 2,720,002 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
HD 3167 is a single, orange-hued star in the zodiac constellation of Pisces that hosts a system with four exoplanets. The star is too faint to be seen with the naked eye, having an apparent visual magnitude of 8.97. The distance to HD 3167 can be determined from its annual parallax shift of 21.1363 mas as measured by the Gaia space observatory, yielding a range of 154 light years. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.204″ per year. Since it was first photographed during the Palomar observatory sky survey in 1953, it had moved over 12.5″ by 2017. The star is moving away from the Earth with an average heliocentric radial velocity of +19.5 km/s.
Excerpted from Wikipedia · full article
3 siblings around HD 3167
HD 3167 c shares its host star with 3 other confirmed planets. Side-by-side measurements below.
HD 3167 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#521of 1978
top 26.3%
This planet
3.00R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 3167 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.00 | 11.21 |
| Mass (M⊕) | 1.00 | 11.13 | 317.83 |
| Density (g/cm³) | 5.51 | 2.11 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 16.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 11.130 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 3167
HIP
HIP 2736
TIC
TIC 318707987
Gaia DR2
Gaia DR2 2554032474712538880
Gaia DR3
Gaia DR3 2554032474712538880
System
HD 3167
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 29.85 Earth days (8.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1776 AU.
Transit Fingerprint
Depth
0.095 %
Duration
4.869 h
Impact parameter b
0.451
Rp / R★
0.030060
Transit midpoint (BJD)
2,457,394.9788
Photometric dip
Transit produces a flux drop of 946 ppm lasting ≈ 4.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030060
Semi-major axis / stellar radius
44.010
Impact parameter (b)
0.451
RV semi-amplitude (K)
2.580 m/s
Transit mid-time (BJD)
2,457,394.9788
Long. of periastron (ω)
178.00°
Sky-projected obliquity (λ)
-108.90°
True obliquity (ψ)
107.70°
Angular separation (arcsec)
3.76000
Eq. Temperature
564K
(291 °C)
Insolation (S⊕)
16.90
Earth = 1.00
Earth Similarity (ESI)
0.419
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Vanderburg et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: HD 3167
Spectral Class
K-type orange
Effective Temperature
5,261 K — cooler than the Sun (5,778 K)
Estimated Age
7.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.880 R☉
Stellar Mass
0.837 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.530 dex
Stellar density
1.817 g/cm³
Systemic radial velocity
19.53 km/s
Rotational v·sin i
2.41 km/s
Rotation period
23.52 days
Activity index (log R'HK)
-5.040
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
21.118 mas
Total Proper Motion
203.880 mas/yr
PM Right Ascension
107.41 mas/yr
PM Declination
-173.29 mas/yr
Galactic Cartesian (pc)
x = 0.986 · y = 0.152 · z = 0.076
Equatorial (J2000)
RA 8.74015° · Dec 4.38072°
Galactic ℓ, b
115.111° · -58.241°
Ecliptic λ, β
9.749° · 0.562°
HTM-20 index
-1000385905
Observation Record
Photometric series
1
Transmission spectra
4
Archive notes
2
Similar Worlds
K2-136 c
Sub-Neptune · K-type orange
Radius 3.00 R⊕ · 193.2 ly
TOI-1246 b
Sub-Neptune · K-type orange
Radius 3.01 R⊕ · 552.6 ly
Kepler-1341 b
Sub-Neptune · K-type orange
Radius 2.99 R⊕ · 1,555.6 ly
TOI-1803 b
Sub-Neptune · K-type orange
Radius 2.99 R⊕ · 388.9 ly
Kepler-1881 b
Sub-Neptune · K-type orange
Radius 2.98 R⊕ · 3,448.2 ly
Kepler-248 b
Sub-Neptune · K-type orange
Radius 3.02 R⊕ · 2,409.6 ly