Key parameters at a glance
- A radius of 1.98 Earth radii
- A mass of 4.15 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 7.434 days
- Semi-major axis 0.0706 AU
- Equilibrium temperature 805 K (532 °C)
- Distance from Earth 134.28 light-years
- Earth Similarity Index 0.338
- Travel time at Voyager 1 speed 2,368,034 years
- Almost certainly tidally locked to its host star given the close orbit
HD 235088 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#24of 1176
top 2.0%
This planet
1.98R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | HD 235088 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.98 | 11.21 |
| Mass (M⊕) | 1.00 | 4.15 | 317.83 |
| Density (g/cm³) | 5.51 | 2.92 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 70.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.150 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 235088
HIP
HIP 98668
TIC
TIC 293954617
Gaia DR2
Gaia DR2 2089570519439964416
Gaia DR3
Gaia DR3 2089570519439964416
System
HD 235088
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.43 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0706 AU.
Transit Fingerprint
Depth
0.070 %
Duration
2.673 h
Impact parameter b
0.435
Rp / R★
0.023600
Transit midpoint (BJD)
2,458,705.6461
Photometric dip
Transit produces a flux drop of 701 ppm lasting ≈ 2.67 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023600
Semi-major axis / stellar radius
19.710
Impact parameter (b)
0.435
RV semi-amplitude (K)
1.520 m/s
Transit mid-time (BJD)
2,458,705.6461
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.71000
Eq. Temperature
805K
(532 °C)
Insolation (S⊕)
70.00
Earth = 1.00
Earth Similarity (ESI)
0.338
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
Orell Miquel et al. 2023Instrument
TESS CCD Array
Publication
2023-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 235088
Spectral Class
K-type orange
Effective Temperature
5,075 K — cooler than the Sun (5,778 K)
Estimated Age
0.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.772 R☉
Stellar Mass
0.849 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.550 dex
Stellar density
2.622 g/cm³
Rotational v·sin i
1.90 km/s
Rotation period
12.17 days
Activity index (log R'HK)
-4.480
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
24.260 mas
Total Proper Motion
219.833 mas/yr
PM Right Ascension
164.82 mas/yr
PM Declination
145.47 mas/yr
Galactic Cartesian (pc)
x = 0.304 · y = -0.513 · z = 0.803
Equatorial (J2000)
RA 300.61545° · Dec 53.37744°
Galactic ℓ, b
87.458° · 11.774°
Ecliptic λ, β
333.450° · 70.147°
HTM-20 index
-1889364398
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