Key parameters at a glance
- A radius of 2.25 Earth radii
- A mass of 6.10 Earth masses
- Surface gravity around 1.20 g
- An orbital period of 6.441 days
- Semi-major axis 0.0629 AU
- Equilibrium temperature 743 K (470 °C)
- Distance from Earth 76.99 light-years
- Earth Similarity Index 0.363
- Travel time at Voyager 1 speed 1,357,761 years
- Almost certainly tidally locked to its host star given the close orbit
HD 207496 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1589of 1978
top 80.3%
This planet
2.25R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 207496 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.25 | 11.21 |
| Mass (M⊕) | 1.00 | 6.10 | 317.83 |
| Density (g/cm³) | 5.51 | 3.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.20 | 2.53 |
| Insolation (S⊕) | 1.00 | 72.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 207496
HIP
HIP 108162 A
TIC
TIC 290348383
Gaia DR2
Gaia DR2 6356417496318028800
Gaia DR3
Gaia DR3 6356417496318028800
System
HD 207496
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.44 Earth days (1.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0629 AU.
Transit Fingerprint
Depth
0.091 %
Duration
1.762 h
Impact parameter b
0.430
Rp / R★
0.026630
Transit midpoint (BJD)
2,458,658.7898
Photometric dip
Transit produces a flux drop of 914 ppm lasting ≈ 1.76 h.
Extended Orbital Architecture
Planet / star radius ratio
0.026630
Semi-major axis / stellar radius
21.470
Impact parameter (b)
0.430
RV semi-amplitude (K)
2.520 m/s
Transit mid-time (BJD)
2,458,658.7898
Long. of periastron (ω)
57.00°
Angular separation (arcsec)
2.66000
Eq. Temperature
743K
(470 °C)
Insolation (S⊕)
72.90
Earth = 1.00
Earth Similarity (ESI)
0.363
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
Barros et al. 2023Instrument
TESS CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 207496
Spectral Class
K-type orange
Effective Temperature
4,819 K — cooler than the Sun (5,778 K)
Estimated Age
0.52 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.769 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.507 dex
Stellar density
2.495 g/cm³
Rotation period
12.36 days
Activity index (log R'HK)
-4.457
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
42.333 mas
Total Proper Motion
292.220 mas/yr
PM Right Ascension
224.86 mas/yr
PM Declination
-186.63 mas/yr
Galactic Cartesian (pc)
x = 0.187 · y = -0.114 · z = -0.976
Equatorial (J2000)
RA 328.71817° · Dec -77.33880°
Galactic ℓ, b
313.779° · -35.795°
Ecliptic λ, β
290.819° · -58.201°
HTM-20 index
-1926219648
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