Key parameters at a glance
- A radius of 3.49 Earth radii
- A mass of 20.40 Earth masses
- Surface gravity around 1.67 g
- An orbital period of 17.471 days
- Semi-major axis 0.1322 AU
- Equilibrium temperature 752 K (479 °C)
- Distance from Earth 186.77 light-years
- Earth Similarity Index 0.317
- Travel time at Voyager 1 speed 3,293,752 years
HD 183579 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#184of 1978
top 9.3%
This planet
3.49R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 183579 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.49 | 11.21 |
| Mass (M⊕) | 1.00 | 20.40 | 317.83 |
| Density (g/cm³) | 5.51 | 2.65 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.67 | 2.53 |
| Insolation (S⊕) | 1.00 | 58.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 20.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 183579
HIP
HIP 96160
TIC
TIC 320004517
Gaia DR2
Gaia DR2 6641996571978861440
Gaia DR3
Gaia DR3 6641996571978861440
System
HD 183579
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.47 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1322 AU.
Transit Fingerprint
Depth
0.111 %
Duration
4.306 h
Impact parameter b
0.480
Rp / R★
0.033260
Transit midpoint (BJD)
2,458,661.0626
Photometric dip
Transit produces a flux drop of 1,106 ppm lasting ≈ 4.31 h.
Extended Orbital Architecture
Planet / star radius ratio
0.033260
Semi-major axis / stellar radius
29.100
Impact parameter (b)
0.480
RV semi-amplitude (K)
5.030 m/s
Transit mid-time (BJD)
2,458,661.0626
Long. of periastron (ω)
270.00°
Angular separation (arcsec)
2.31000
Eq. Temperature
752K
(479 °C)
Insolation (S⊕)
58.10
Earth = 1.00
Earth Similarity (ESI)
0.317
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Palatnick et al. 2021Instrument
TESS CCD Array
Publication
2021-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 183579
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,784 K — hotter than the Sun (5,778 K)
Estimated Age
3.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.960 R☉
Stellar Mass
0.996 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
1.587 g/cm³
Systemic radial velocity
-15.80 km/s
Rotational v·sin i
2.00 km/s
Rotation period
24.80 days
Activity index (log R'HK)
-4.840
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
17.434 mas
Total Proper Motion
136.335 mas/yr
PM Right Ascension
108.44 mas/yr
PM Declination
-82.63 mas/yr
Galactic Cartesian (pc)
x = 0.229 · y = -0.533 · z = -0.814
Equatorial (J2000)
RA 293.28661° · Dec -54.53273°
Galactic ℓ, b
343.062° · -27.700°
Ecliptic λ, β
285.753° · -32.360°
HTM-20 index
-381105343
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