Key parameters at a glance
- A radius of 8.29 Earth radii
- A mass of 82.64 Earth masses
- Surface gravity around 1.20 g
- An orbital period of 3.937 days
- Semi-major axis 0.0430 AU
- Equilibrium temperature 690 K (417 °C)
- Distance from Earth 424.30 light-years
- Earth Similarity Index 0.234
- Travel time at Voyager 1 speed 7,482,523 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-3629 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#137of 574
top 23.7%
This planet
8.29R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-3629 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.29 | 11.21 |
| Mass (M⊕) | 1.00 | 82.64 | 317.83 |
| Density (g/cm³) | 5.51 | 0.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.20 | 2.53 |
| Insolation (S⊕) | 1.00 | 39.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 82.635 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 455784423
Gaia DR2
Gaia DR2 2881820324294985856
Gaia DR3
Gaia DR3 2881820324294985856
System
TOI-3629
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.94 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0430 AU.
Transit Fingerprint
Depth
1.546 %
Duration
2.200 h
Impact parameter b
0.200
Rp / R★
0.126000
Transit midpoint (BJD)
2,458,784.2560
Photometric dip
Transit produces a flux drop of 15,461 ppm lasting ≈ 2.20 h.
Extended Orbital Architecture
Planet / star radius ratio
0.126000
Semi-major axis / stellar radius
15.400
Impact parameter (b)
0.200
RV semi-amplitude (K)
45.000 m/s
Transit mid-time (BJD)
2,458,784.2560
Long. of periastron (ω)
-110.00°
Angular separation (arcsec)
0.33100
Eq. Temperature
690K
(417 °C)
Insolation (S⊕)
39.00
Earth = 1.00
Earth Similarity (ESI)
0.234
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
Ca Ntilde As et al. 2022Instrument
TESS CCD Array
Publication
2022-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3629
Spectral Class
M-type red dwarf
Effective Temperature
3,870 K — cooler than the Sun (5,778 K)
Estimated Age
7.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.600 R☉
Stellar Mass
0.630 M☉
Metallicity [Fe/H]
0.40
Extended Stellar Properties
Surface gravity (log g)
4.670 dex
Stellar density
4.000 g/cm³
Systemic radial velocity
-24.83 km/s
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.658 mas
Total Proper Motion
185.750 mas/yr
PM Right Ascension
185.75 mas/yr
PM Declination
1.02 mas/yr
Galactic Cartesian (pc)
x = 0.774 · y = -0.003 · z = 0.634
Equatorial (J2000)
RA 359.79339° · Dec 39.31426°
Galactic ℓ, b
112.023° · -22.448°
Ecliptic λ, β
17.867° · 35.620°
HTM-20 index
1076552828
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