Key parameters at a glance
- A radius of 3.17 Earth radii
- A mass of 10.20 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 8.667 days
- Semi-major axis 0.0785 AU
- Distance from Earth 40.96 light-years
- Earth Similarity Index 0.621
- Travel time at Voyager 1 speed 722,369 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
HD 69830 b is a Neptune-mass or super-Earth-mass exoplanet orbiting the star HD 69830. It is at least 10 times more massive than Earth. It also orbits very close to its parent star and takes 82/3 days to complete an orbit.
Excerpted from Wikipedia · full article
2 siblings around HD 69830
HD 69830 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HD 69830 b this | Sub-Neptune | 3.17 | 10.20 | 8.667 | — | 2006 |
| HD 69830 c | Sub-Neptune | 3.46 | 11.80 | 31.560 | — | 2006 |
| HD 69830 d | Neptune-like | 4.45 | 18.10 | 197.000 | — | 2006 |
HD 69830 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#378of 1978
top 19.1%
This planet
3.17R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 69830 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.17 | 11.21 |
| Mass (M⊕) | 1.00 | 10.20 | 317.83 |
| Density (g/cm³) | 5.51 | 1.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 10.200 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 69830
HIP
HIP 40693
TIC
TIC 307624961
Gaia DR2
Gaia DR2 5726982995343100928
Gaia DR3
Gaia DR3 5726982995343100928
System
HD 69830
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.67 Earth days (2.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0785 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
3.510 m/s
Transit mid-time (BJD)
2,455,995.8700
Long. of periastron (ω)
340.00°
Angular separation (arcsec)
6.25000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.621
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Lovis et al. 2006Instrument
HARPS Spectrograph
Publication
2006-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2006 at La Silla Observatory (3 shown).
Host System: HD 69830
Spectral Class
K-type orange
Effective Temperature
5,385 K — cooler than the Sun (5,778 K)
Estimated Age
7.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.887 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.490 dex
Stellar density
1.830 g/cm³
Systemic radial velocity
29.80 km/s
Rotational v·sin i
1.10 km/s
Activity index (log R'HK)
-4.950
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
79.595 mas
Total Proper Motion
1,026.855 mas/yr
PM Right Ascension
278.79 mas/yr
PM Declination
-988.29 mas/yr
Galactic Cartesian (pc)
x = -0.554 · y = 0.803 · z = -0.219
Equatorial (J2000)
RA 124.60101° · Dec -12.63642°
Galactic ℓ, b
234.568° · 12.823°
Ecliptic λ, β
130.447° · -31.346°
HTM-20 index
1003371150
Observation Record
Photometric series
1
RV measurements
3
Stellar spectra
9
Archive notes
1
Similar Worlds
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