Key parameters at a glance
- A radius of 13.50 Earth radii
- A mass of 537.13 Earth masses
- Surface gravity around 2.95 g
- An orbital period of 410.100 days
- Semi-major axis 1.1400 AU
- Distance from Earth 204.72 light-years
- Earth Similarity Index 0.352
- Travel time at Voyager 1 speed 3,610,231 years
1 sibling around HD 177830
HD 177830 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 177830 c | Neptune-like | 7.87 | 47.67 | 110.900 | — | 2010 |
| HD 177830 b this | Gas Giant | 13.50 | 537.13 | 410.100 | — | 1999 |
HD 177830 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#671of 1771
top 37.8%
This planet
13.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 177830 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.50 | 11.21 |
| Mass (M⊕) | 1.00 | 537.13 | 317.83 |
| Density (g/cm³) | 5.51 | 1.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.95 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 537.133 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 177830
HIP
HIP 93746
TIC
TIC 265052133
Gaia DR2
Gaia DR2 2035963417721248128
Gaia DR3
Gaia DR3 2035963417721248128
System
HD 177830
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.12 Earth years on a mildly elliptical path at a mean orbital distance of 1.1400 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
32.600 m/s
Transit mid-time (BJD)
2,455,452.4000
Long. of periastron (ω)
85.00°
Angular separation (arcsec)
18.20000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.352
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Vogt et al. 2000Instrument
HIRES Spectrometer
Publication
2000-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 1999 at W. M. Keck Observatory (4 shown).
Host System: HD 177830
Spectral Class
K-type orange
Effective Temperature
4,901 K — cooler than the Sun (5,778 K)
Estimated Age
4.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
3.260 R☉
Stellar Mass
1.700 M☉
Metallicity [Fe/H]
0.42
Extended Stellar Properties
Surface gravity (log g)
3.640 dex
Systemic radial velocity
-72.14 km/s
Rotational v·sin i
0.68 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.903 mas
Total Proper Motion
66.767 mas/yr
PM Right Ascension
-41.33 mas/yr
PM Declination
-52.43 mas/yr
Galactic Cartesian (pc)
x = 0.253 · y = -0.863 · z = 0.437
Equatorial (J2000)
RA 286.33636° · Dec 25.92043°
Galactic ℓ, b
57.684° · 8.672°
Ecliptic λ, β
292.258° · 48.105°
HTM-20 index
-899348034
Observation Record
Photometric series
1
RV measurements
2
Stellar spectra
6
Archive notes
1
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