Key parameters at a glance
- A radius of 2.54 Earth radii
- A mass of 7.00 Earth masses
- Surface gravity around 1.09 g
- An orbital period of 33.688 days
- Semi-major axis 0.1970 AU
- Distance from Earth 58.40 light-years
- Earth Similarity Index 0.699
- Travel time at Voyager 1 speed 1,029,882 years
Context from the literature
HD 189567 is a star with a pair of orbiting exoplanets, located in the southern constellation of Pavo. It is also known as Gliese 776, CD-67 2385, and HR 7644. The star has an apparent visual magnitude of 6.07, which is bright enough for it to be dimly visible to the naked eye. It lies at a distance of 58 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −10.5 km/s.
Excerpted from Wikipedia · full article
1 sibling around HD 189567
HD 189567 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 189567 b | Sub-Neptune | 2.85 | 8.50 | 14.288 | — | 2021 |
| HD 189567 c this | Sub-Neptune | 2.54 | 7.00 | 33.688 | — | 2021 |
HD 189567 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1117of 1978
top 56.4%
This planet
2.54R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 189567 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.54 | 11.21 |
| Mass (M⊕) | 1.00 | 7.00 | 317.83 |
| Density (g/cm³) | 5.51 | 2.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.09 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 7.000 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 189567
HIP
HIP 98959
TIC
TIC 352402781
Gaia DR2
Gaia DR2 6427244702486210816
Gaia DR3
Gaia DR3 6427244702486210816
System
HD 189567
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 33.69 Earth days (9.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1970 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
1.600 m/s
Transit mid-time (BJD)
2,455,187.3000
Long. of periastron (ω)
219.00°
Angular separation (arcsec)
11.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.699
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Unger et al. 2021Instrument
HARPS Spectrograph
Publication
2021-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at La Silla Observatory (12 shown).
Host System: HD 189567
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,726 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.040 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
-0.24
Extended Stellar Properties
Surface gravity (log g)
4.410 dex
Stellar density
1.300 g/cm³
Systemic radial velocity
-10.80 km/s
Rotational v·sin i
1.20 km/s
Activity index (log R'HK)
-4.920
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 8 bands
Astrometric Data
Parallax
55.820 mas
Total Proper Motion
1,081.168 mas/yr
PM Right Ascension
845.35 mas/yr
PM Declination
-674.03 mas/yr
Galactic Cartesian (pc)
x = 0.201 · y = -0.329 · z = -0.923
Equatorial (J2000)
RA 301.39596° · Dec -67.32380°
Galactic ℓ, b
328.462° · -31.993°
Ecliptic λ, β
286.707° · -45.697°
HTM-20 index
-1199055925
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