Key parameters at a glance
- A radius of 2.44 Earth radii
- A mass of 12.60 Earth masses
- Surface gravity around 2.12 g
- An orbital period of 9.552 days
- Semi-major axis 0.0907 AU
- Equilibrium temperature 1,153 K (880 °C)
- Distance from Earth 356.66 light-years
- Earth Similarity Index 0.231
- Travel time at Voyager 1 speed 6,289,723 years
1 sibling around HD 106315
HD 106315 b 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 106315 b this | Sub-Neptune | 2.44 | 12.60 | 9.552 | 1,153 | 2017 |
| HD 106315 c | Neptune-like | 4.35 | 15.20 | 21.057 | 886 | 2017 |
HD 106315 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1269of 1978
top 64.1%
This planet
2.44R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 106315 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.44 | 11.21 |
| Mass (M⊕) | 1.00 | 12.60 | 317.83 |
| Density (g/cm³) | 5.51 | 4.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 277.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 12.600 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 106315
TIC
TIC 56815340
Gaia DR2
Gaia DR2 3698307419878650240
Gaia DR3
Gaia DR3 3698307419878650240
System
HD 106315
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.55 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0907 AU.
Transit Fingerprint
Depth
0.035 %
Duration
3.775 h
Impact parameter b
0.670
Rp / R★
0.017280
Transit midpoint (BJD)
2,457,586.5487
Photometric dip
Transit produces a flux drop of 354 ppm lasting ≈ 3.78 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017280
Semi-major axis / stellar radius
15.070
Impact parameter (b)
0.670
RV semi-amplitude (K)
3.630 m/s
Transit mid-time (BJD)
2,457,586.5487
Long. of periastron (ω)
239.00°
Angular separation (arcsec)
0.82900
Eq. Temperature
1,153K
(880 °C)
Insolation (S⊕)
277.00
Earth = 1.00
Earth Similarity (ESI)
0.231
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Crossfield et al. 2017Instrument
Kepler CCD Array
Publication
2017-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2017 at K2 (12 shown).
Host System: HD 106315
Spectral Class
F-type yellow-white
Effective Temperature
6,327 K — hotter than the Sun (5,778 K)
Estimated Age
4.48 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.296 R☉
Stellar Mass
1.091 M☉
Metallicity [Fe/H]
-0.31
Extended Stellar Properties
Surface gravity (log g)
4.252 dex
Stellar density
0.977 g/cm³
Systemic radial velocity
-3.34 km/s
Rotational v·sin i
12.71 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
9.116 mas
Total Proper Motion
12.280 mas/yr
PM Right Ascension
-2.66 mas/yr
PM Declination
11.99 mas/yr
Galactic Cartesian (pc)
x = -0.998 · y = -0.061 · z = -0.007
Equatorial (J2000)
RA 183.47247° · Dec -0.39344°
Galactic ℓ, b
283.250° · 61.035°
Ecliptic λ, β
183.339° · 1.019°
HTM-20 index
-1618145783
Similar Worlds
K2-12 b
Sub-Neptune · F-type yellow-white
Radius 2.44 R⊕ · 1,064.5 ly
TOI-1054.01
Sub-Neptune · F-type yellow-white
Radius 2.43 R⊕ · 288.4 ly
Kepler-147 c
Sub-Neptune · F-type yellow-white
Radius 2.43 R⊕ · 3,398.6 ly
HD 5278 b
Sub-Neptune · F-type yellow-white
Radius 2.45 R⊕ · 187.8 ly
Kepler-173 c
Sub-Neptune · F-type yellow-white
Radius 2.43 R⊕ · 2,717.4 ly
Kepler-201 b
Sub-Neptune · F-type yellow-white
Radius 2.46 R⊕ · 2,075.8 ly