Key parameters at a glance
- A radius of 4.26 Earth radii
- A mass of 16.80 Earth masses
- Surface gravity around 0.93 g
- An orbital period of 49.175 days
- Semi-major axis 0.2687 AU
- Distance from Earth 150.33 light-years
- Earth Similarity Index 0.524
- Travel time at Voyager 1 speed 2,651,027 years
5 siblings around HD 34445
HD 34445 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 |
|---|---|---|---|---|---|---|
| HD 34445 e this | Neptune-like | 4.26 | 16.80 | 49.175 | — | 2017 |
| HD 34445 d | Neptune-like | 6.07 | 30.70 | 117.870 | — | 2017 |
| HD 34445 c | Neptune-like | 8.42 | 53.50 | 214.670 | — | 2017 |
| HD 34445 f | Neptune-like | 6.88 | 37.90 | 676.800 | — | 2017 |
| HD 34445 b | Gas Giant | 13.90 | 260.62 | 1,049.000 | — | 2009 |
| HD 34445 g | Gas Giant | 13.60 | 120.60 | 5,700.000 | — | 2017 |
HD 34445 e Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#506of 574
top 88.0%
This planet
4.26R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 34445 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.26 | 11.21 |
| Mass (M⊕) | 1.00 | 16.80 | 317.83 |
| Density (g/cm³) | 5.51 | 1.19 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.93 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 16.800 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 34445
HIP
HIP 24681
TIC
TIC 284907742
Gaia DR2
Gaia DR2 3241295308714904960
Gaia DR3
Gaia DR3 3241295308714904960
System
HD 34445
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 49.18 Earth days (13.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2687 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.524
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Vogt et al. 2017Instrument
Multiple Instruments
Publication
2017-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2017 at Multiple Observatories (12 shown).
Host System: HD 34445
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,836 K — hotter than the Sun (5,778 K)
Estimated Age
8.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.380 R☉
Stellar Mass
1.070 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.210 dex
Stellar density
0.467 g/cm³
Systemic radial velocity
-79.04 km/s
Rotational v·sin i
2.70 km/s
Rotation period
22.00 days
Activity index (log R'HK)
-5.040
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
21.668 mas
Total Proper Motion
146.999 mas/yr
PM Right Ascension
-0.81 mas/yr
PM Declination
-147.00 mas/yr
Galactic Cartesian (pc)
x = 0.182 · y = 0.975 · z = 0.128
Equatorial (J2000)
RA 79.42075° · Dec 7.35272°
Galactic ℓ, b
195.039° · -17.022°
Ecliptic λ, β
79.094° · -15.687°
HTM-20 index
2057180744
Similar Worlds
Kepler-230 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.26 R⊕ · 2,416.0 ly
Kepler-1747 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.27 R⊕ · 4,309.8 ly
TOI-1439 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.24 R⊕ · 751.2 ly
Kepler-164 e
Neptune-like · G-type yellow (Sun-like)
Radius 4.24 R⊕ · 2,905.3 ly
Kepler-554 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.29 R⊕ · 2,252.2 ly
KOI-984 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.30 R⊕ · 824.1 ly