Key parameters at a glance
- A radius of 1.77 Earth radii
- A mass of 19.50 Earth masses
- Surface gravity around 6.22 g
- An orbital period of 13.635 days
- Semi-major axis 0.1363 AU
- Equilibrium temperature 358 K (85 °C)
- Distance from Earth 138.32 light-years
- Earth Similarity Index 0.635
- Travel time at Voyager 1 speed 2,439,264 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-2285 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#293of 1176
top 24.8%
This planet
1.77R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-2285 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.77 | 11.21 |
| Mass (M⊕) | 1.00 | 19.50 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 6.22 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.91 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 19.500 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 329148988
Gaia DR2
Gaia DR2 2199658670194983040
Gaia DR3
Gaia DR3 2199658670194983040
System
TOI-2285
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.64 Earth days (3.7% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1363 AU.
Transit Fingerprint
Depth
0.115 %
Duration
2.416 h
Impact parameter b
0.440
Rp / R★
0.034800
Transit midpoint (BJD)
2,458,747.1831
Photometric dip
Transit produces a flux drop of 1,154 ppm lasting ≈ 2.42 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034800
Semi-major axis / stellar radius
43.100
Impact parameter (b)
0.440
RV semi-amplitude (K)
7.500 m/s
Transit mid-time (BJD)
2,458,747.1831
Long. of periastron (ω)
56.00°
Angular separation (arcsec)
3.21000
Eq. Temperature
358K
(85 °C)
Insolation (S⊕)
3.91
Earth = 1.00
Earth Similarity (ESI)
0.635
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Fukui et al. 2022Instrument
TESS CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2285
Spectral Class
M-type red dwarf
Effective Temperature
3,491 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.464 R☉
Stellar Mass
0.454 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.773 dex
Stellar density
6.621 g/cm³
Systemic radial velocity
-24.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
23.551 mas
Total Proper Motion
29.796 mas/yr
PM Right Ascension
21.26 mas/yr
PM Declination
-20.87 mas/yr
Galactic Cartesian (pc)
x = 0.461 · y = -0.239 · z = 0.855
Equatorial (J2000)
RA 332.56326° · Dec 58.70609°
Galactic ℓ, b
103.288° · 2.124°
Ecliptic λ, β
14.624° · 61.546°
HTM-20 index
-1395354054
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