Key parameters at a glance
- A radius of 1.92 Earth radii
- A mass of 5.20 Earth masses
- Surface gravity around 1.41 g
- An orbital period of 7.103 days
- Semi-major axis 0.0576 AU
- Equilibrium temperature 482 K (209 °C)
- Distance from Earth 209.49 light-years
- Earth Similarity Index 0.575
- Travel time at Voyager 1 speed 3,694,402 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around TOI-663
TOI-663 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
TOI-663 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#102of 1176
top 8.6%
This planet
1.92R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-663 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.92 | 11.21 |
| Mass (M⊕) | 1.00 | 5.20 | 317.83 |
| Density (g/cm³) | 5.51 | 4.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.41 | 2.53 |
| Insolation (S⊕) | 1.00 | 12.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 54962195
Gaia DR2
Gaia DR2 3762515188088861184
Gaia DR3
Gaia DR3 3762515188088861184
System
TOI-663
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.10 Earth days (1.9% of a terrestrial year) at a mean orbital distance of 0.0576 AU.
Transit Fingerprint
Depth
0.132 %
Duration
2.754 h
Impact parameter b
0.170
Rp / R★
0.034500
Transit midpoint (BJD)
2,458,547.1125
Photometric dip
Transit produces a flux drop of 1,318 ppm lasting ≈ 2.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034500
Impact parameter (b)
0.170
RV semi-amplitude (K)
2.700 m/s
Transit mid-time (BJD)
2,458,547.1125
Angular separation (arcsec)
0.89700
Eq. Temperature
482K
(209 °C)
Insolation (S⊕)
12.90
Earth = 1.00
Earth Similarity (ESI)
0.575
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.
Discovery Paper
Primary reference
Cointepas et al. 2024Instrument
TESS CCD Array
Publication
2024-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-663
Spectral Class
M-type red dwarf
Effective Temperature
3,681 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.512 R☉
Stellar Mass
0.514 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.727 dex
Stellar density
5.347 g/cm³
Rotation period
30.00 days
Activity index (log R'HK)
-4.810
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.540 mas
Total Proper Motion
164.616 mas/yr
PM Right Ascension
-142.18 mas/yr
PM Declination
-82.96 mas/yr
Galactic Cartesian (pc)
x = -0.930 · y = 0.337 · z = -0.148
Equatorial (J2000)
RA 160.06585° · Dec -8.51108°
Galactic ℓ, b
256.572° · 42.254°
Ecliptic λ, β
164.917° · -15.659°
HTM-20 index
-595525992
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