Key parameters at a glance
- A radius of 5.34 Earth radii
- A mass of 31.30 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 3.770 days
- Semi-major axis 0.0450 AU
- Equilibrium temperature 943 K (670 °C)
- Distance from Earth 406.65 light-years
- Earth Similarity Index 0.201
- Travel time at Voyager 1 speed 7,171,295 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-1694
TOI-1694 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-1694 b this | Neptune-like | 5.34 | 31.30 | 3.770 | 943 | 2023 |
| TOI-1694 c | Gas Giant | 13.80 | 297.00 | 393.100 | — | 2023 |
TOI-1694 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#335of 574
top 58.2%
This planet
5.34R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1694 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.34 | 11.21 |
| Mass (M⊕) | 1.00 | 31.30 | 317.83 |
| Density (g/cm³) | 5.51 | 1.13 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 195.29 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 31.300 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 396740648
Gaia DR2
Gaia DR2 1104269596843209472
Gaia DR3
Gaia DR3 1104269596843209472
System
TOI-1694
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.77 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0450 AU.
Transit Fingerprint
Depth
0.436 %
Duration
2.870 h
Impact parameter b
0.266
Rp / R★
0.060948
Transit midpoint (BJD)
2,458,817.2663
Photometric dip
Transit produces a flux drop of 4,361 ppm lasting ≈ 2.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.060948
Semi-major axis / stellar radius
10.206
Impact parameter (b)
0.266
RV semi-amplitude (K)
14.300 m/s
Transit mid-time (BJD)
2,458,817.2663
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.36100
Eq. Temperature
943K
(670 °C)
Insolation (S⊕)
195.29
Earth = 1.00
Earth Similarity (ESI)
0.201
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
Van Zandt et al. 2023Instrument
TESS CCD Array
Publication
2023-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1694
Spectral Class
K-type orange
Effective Temperature
5,058 K — cooler than the Sun (5,778 K)
Estimated Age
4.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.804 R☉
Stellar Mass
0.853 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.558 dex
Stellar density
2.301 g/cm³
Rotational v·sin i
1.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.992 mas
Total Proper Motion
50.774 mas/yr
PM Right Ascension
46.51 mas/yr
PM Declination
-20.36 mas/yr
Galactic Cartesian (pc)
x = -0.054 · y = 0.397 · z = 0.916
Equatorial (J2000)
RA 97.74871° · Dec 66.36060°
Galactic ℓ, b
148.585° · 22.702°
Ecliptic λ, β
94.238° · 43.035°
HTM-20 index
-1848056411
Similar Worlds
TOI-3568 b
Neptune-like · K-type orange
Radius 5.30 R⊕ · 645.5 ly
Kepler-1737 b
Neptune-like · K-type orange
Radius 5.40 R⊕ · —
Kepler-257 c
Neptune-like · K-type orange
Radius 5.41 R⊕ · 2,544.9 ly
HD 192310 c
Neptune-like · K-type orange
Radius 5.25 R⊕ · 28.7 ly
HD 99492 b
Neptune-like · K-type orange
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Kepler-957 b
Neptune-like · K-type orange
Radius 5.50 R⊕ · 2,689.8 ly