Key parameters at a glance
- A radius of 15.56 Earth radii
- A mass of 176.08 Earth masses
- Surface gravity around 0.73 g
- An orbital period of 3.653 days
- Semi-major axis 0.0470 AU
- Equilibrium temperature 1,616 K (1343 °C)
- Distance from Earth 932.46 light-years
- Earth Similarity Index 0.064
- Travel time at Voyager 1 speed 16,443,996 years
TOI-3321 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#194of 1771
top 10.9%
This planet
15.56R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-3321 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.56 | 11.21 |
| Mass (M⊕) | 1.00 | 176.08 | 317.83 |
| Density (g/cm³) | 5.51 | 0.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.73 | 2.53 |
| Insolation (S⊕) | 1.00 | 967.92 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 176.077 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 306648160
Gaia DR2
Gaia DR2 5909085279371278336
Gaia DR3
Gaia DR3 5909085279371278336
System
TOI-3321
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.65 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0470 AU.
Transit Fingerprint
Depth
0.966 %
Duration
4.310 h
Impact parameter b
0.420
Rp / R★
0.092100
Transit midpoint (BJD)
2,458,940.8175
Photometric dip
Transit produces a flux drop of 9,660 ppm lasting ≈ 4.31 h.
Extended Orbital Architecture
Planet / star radius ratio
0.092100
Semi-major axis / stellar radius
6.540
Impact parameter (b)
0.420
RV semi-amplitude (K)
71.000 m/s
Transit mid-time (BJD)
2,458,940.8175
Long. of periastron (ω)
12.00°
Angular separation (arcsec)
0.16400
Eq. Temperature
1,616K
(1343 °C)
Insolation (S⊕)
967.92
Earth = 1.00
Earth Similarity (ESI)
0.064
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Schulte et al. 2024Instrument
TESS CCD Array
Publication
2024-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3321
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,850 K — hotter than the Sun (5,778 K)
Estimated Age
8.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.549 R☉
Stellar Mass
1.041 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.076 dex
Stellar density
0.396 g/cm³
Rotational v·sin i
5.19 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.470 mas
Total Proper Motion
1.964 mas/yr
PM Right Ascension
0.11 mas/yr
PM Declination
-1.96 mas/yr
Galactic Cartesian (pc)
x = -0.031 · y = -0.421 · z = -0.906
Equatorial (J2000)
RA 265.76034° · Dec -65.00825°
Galactic ℓ, b
328.000° · -17.622°
Ecliptic λ, β
267.602° · -41.604°
HTM-20 index
-155577675
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