Key parameters at a glance
- A radius of 4.92 Earth radii
- A mass of 12.00 Earth masses
- Surface gravity around 0.50 g
- An orbital period of 369.000 days
- Equilibrium temperature 335 K (62 °C)
- Distance from Earth 346.67 light-years
- Earth Similarity Index 0.466
- Travel time at Voyager 1 speed 6,113,489 years
5 siblings around HIP 41378
HIP 41378 e shares its host star with 5 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HIP 41378 b | Sub-Neptune | 2.60 | 6.89 | 15.572 | 959 | 2016 |
| HIP 41378 c | Sub-Neptune | 2.73 | 4.40 | 31.706 | 757 | 2016 |
| HIP 41378 g | Sub-Neptune | 2.54 | 7.00 | 62.060 | 605 | 2025 |
| HIP 41378 d | Sub-Neptune | 3.54 | 4.60 | 278.362 | 367 | 2016 |
| HIP 41378 e this | Neptune-like | 4.92 | 12.00 | 369.000 | 335 | 2016 |
| HIP 41378 f | Neptune-like | 9.20 | 12.00 | 542.080 | 294 | 2016 |
HIP 41378 e Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#393of 574
top 68.3%
This planet
4.92R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HIP 41378 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.92 | 11.21 |
| Mass (M⊕) | 1.00 | 12.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.50 | 2.53 |
| Insolation (S⊕) | 1.00 | 2.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 12.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 41378
TIC
TIC 366443426
Gaia DR2
Gaia DR2 600698184764497664
Gaia DR3
Gaia DR3 600698184764497664
System
HIP 41378
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.01 Earth years.
Transit Fingerprint
Duration
13.007 h
Impact parameter b
0.310
Rp / R★
0.036860
Transit midpoint (BJD)
2,457,142.0194
Extended Orbital Architecture
Planet / star radius ratio
0.036860
Semi-major axis / stellar radius
283.000
Impact parameter (b)
0.310
Transit mid-time (BJD)
2,457,142.0194
Eq. Temperature
335K
(62 °C)
Insolation (S⊕)
2.10
Earth = 1.00
Earth Similarity (ESI)
0.466
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
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
2016-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: HIP 41378
Spectral Class
F-type yellow-white
Effective Temperature
6,320 K — hotter than the Sun (5,778 K)
Estimated Age
4.28 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.273 R☉
Stellar Mass
1.160 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.294 dex
Stellar density
0.680 g/cm³
Systemic radial velocity
50.42 km/s
Rotational v·sin i
5.60 km/s
Activity index (log R'HK)
-4.780
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
9.380 mas
Total Proper Motion
48.143 mas/yr
PM Right Ascension
-48.14 mas/yr
PM Declination
0.06 mas/yr
Galactic Cartesian (pc)
x = -0.587 · y = 0.790 · z = 0.175
Equatorial (J2000)
RA 126.61583° · Dec 10.08037°
Galactic ℓ, b
214.526° · 25.646°
Ecliptic λ, β
126.459° · -8.845°
HTM-20 index
1036383337
Similar Worlds
Kepler-669 b
Neptune-like · F-type yellow-white
Radius 4.83 R⊕ · 6,729.9 ly
Kepler-1640 b
Neptune-like · F-type yellow-white
Radius 4.82 R⊕ · 6,065.8 ly
K2-98 b
Neptune-like · F-type yellow-white
Radius 5.07 R⊕ · 1,691.5 ly
Kepler-1527 b
Neptune-like · F-type yellow-white
Radius 4.77 R⊕ · 6,008.2 ly
Kepler-502 b
Neptune-like · F-type yellow-white
Radius 4.77 R⊕ · 5,189.3 ly
HD 144899 b
Neptune-like · F-type yellow-white
Radius 4.77 R⊕ · 377.2 ly