Key parameters at a glance
- A radius of 10.00 Earth radii
- A mass of 71.80 Earth masses
- Surface gravity around 0.72 g
- An orbital period of 3.024 days
- Semi-major axis 0.0398 AU
- Distance from Earth 96.39 light-years
- Earth Similarity Index 0.306
- Travel time at Voyager 1 speed 1,699,812 years
- Almost certainly tidally locked to its host star given the close orbit
HD 46375 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1770of 1771
top 99.9%
This planet
10.00R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 46375 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.00 | 11.21 |
| Mass (M⊕) | 1.00 | 71.80 | 317.83 |
| Density (g/cm³) | 5.51 | 0.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.72 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 71.800 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 46375
HIP
HIP 31246
TIC
TIC 234928947
Gaia DR2
Gaia DR2 3131777319158581376
Gaia DR3
Gaia DR3 3131777319158581376
System
HD 46375
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.02 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0398 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
33.650 m/s
Transit mid-time (BJD)
2,452,571.0440
Long. of periastron (ω)
114.00°
Angular separation (arcsec)
1.35000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.306
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Marcy et al. 2000Instrument
HIRES Spectrometer
Publication
2000-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2000 at W. M. Keck Observatory (4 shown).
Host System: HD 46375
Spectral Class
K-type orange
Effective Temperature
5,285 K — cooler than the Sun (5,778 K)
Estimated Age
9.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.914 R☉
Stellar Mass
0.920 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.533 dex
Stellar density
1.640 g/cm³
Systemic radial velocity
-1.07 km/s
Rotational v·sin i
0.86 km/s
Activity index (log R'HK)
-4.960
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
33.809 mas
Total Proper Motion
147.716 mas/yr
PM Right Ascension
111.48 mas/yr
PM Declination
-96.92 mas/yr
Galactic Cartesian (pc)
x = -0.144 · y = 0.985 · z = 0.095
Equatorial (J2000)
RA 98.30308° · Dec 5.46251°
Galactic ℓ, b
205.992° · -1.546°
Ecliptic λ, β
98.676° · -17.727°
HTM-20 index
-1544409914
Observation Record
Photometric series
1
RV measurements
2
Stellar spectra
2
Archive notes
5
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