Key parameters at a glance
- A radius of 12.70 Earth radii
- A mass of 1,954.64 Earth masses
- Surface gravity around 12.12 g
- An orbital period of 12,085.452 days
- Semi-major axis 10.2580 AU
- Distance from Earth 181.30 light-years
- Earth Similarity Index 0.441
- Travel time at Voyager 1 speed 3,197,214 years
Context from the literature
HD 30177 is a single star with a pair of orbiting exoplanets in the southern constellation Dorado. Based on parallax measurements, it is located at a distance of 181 light years from the Sun. It has an absolute magnitude of 4.72, but at that distance the star is too faint to be viewed by the naked eye with an apparent visual magnitude of 8.41. The star is drifting further away with a radial velocity of 62.7 km/s.
Excerpted from Wikipedia · full article
1 sibling around HD 30177
HD 30177 c 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 30177 b | Gas Giant | 12.60 | 2,670.71 | 2,514.534 | — | 2002 |
| HD 30177 c this | Gas Giant | 12.70 | 1,954.64 | 12,085.452 | — | 2016 |
HD 30177 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1130of 1771
top 63.7%
This planet
12.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 30177 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.70 | 11.21 |
| Mass (M⊕) | 1.00 | 1,954.64 | 317.83 |
| Density (g/cm³) | 5.51 | 5.24 | 1.33 |
| Surface Gravity (g) | 1.00 | 12.12 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,954.645 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,415.508 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 30177
HIP
HIP 21850
TIC
TIC 220408612
Gaia DR2
Gaia DR2 4774301387290235136
Gaia DR3
Gaia DR3 4774301387290235136
System
HD 30177
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 33.09 Earth years on a nearly circular orbit at a mean orbital distance of 10.2580 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.441
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Wittenmyer et al. 2017Instrument
Multiple Instruments
Publication
2017-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at Multiple Observatories (12 shown).
Host System: HD 30177
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,580 K — cooler than the Sun (5,778 K)
Estimated Age
2.52 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.019 R☉
Stellar Mass
0.980 M☉
Metallicity [Fe/H]
0.37
Extended Stellar Properties
Surface gravity (log g)
4.417 dex
Stellar density
0.815 g/cm³
Systemic radial velocity
62.80 km/s
Rotational v·sin i
2.96 km/s
Rotation period
45.00 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
17.961 mas
Total Proper Motion
67.282 mas/yr
PM Right Ascension
66.21 mas/yr
PM Declination
-11.99 mas/yr
Galactic Cartesian (pc)
x = 0.177 · y = 0.499 · z = -0.848
Equatorial (J2000)
RA 70.47710° · Dec -58.02081°
Galactic ℓ, b
267.370° · -39.734°
Ecliptic λ, β
34.259° · -77.634°
HTM-20 index
2041062208
Observation Record
Photometric series
1
RV measurements
2
Archive notes
2
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