Key parameters at a glance
- A radius of 5.25 Earth radii
- A mass of 23.60 Earth masses
- Surface gravity around 0.86 g
- An orbital period of 1.977 days
- Semi-major axis 0.0250 AU
- Equilibrium temperature 635 K (362 °C)
- Distance from Earth 150.31 light-years
- Earth Similarity Index 0.291
- Travel time at Voyager 1 speed 2,650,705 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-674 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#348of 574
top 60.5%
This planet
5.25R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-674 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.25 | 11.21 |
| Mass (M⊕) | 1.00 | 23.60 | 317.83 |
| Density (g/cm³) | 5.51 | 0.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.86 | 2.53 |
| Insolation (S⊕) | 1.00 | 38.40 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 23.600 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 158588995
Gaia DR2
Gaia DR2 5400949450924312576
Gaia DR3
Gaia DR3 5400949450924312576
System
TOI-674
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.98 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0250 AU.
Transit Fingerprint
Depth
1.388 %
Duration
1.110 h
Impact parameter b
0.624
Rp / R★
0.114000
Transit midpoint (BJD)
2,458,641.4046
Photometric dip
Transit produces a flux drop of 13,877 ppm lasting ≈ 1.11 h.
Extended Orbital Architecture
Planet / star radius ratio
0.114000
Semi-major axis / stellar radius
12.800
Impact parameter (b)
0.624
RV semi-amplitude (K)
21.440 m/s
Transit mid-time (BJD)
2,458,641.4046
Angular separation (arcsec)
0.54200
Eq. Temperature
635K
(362 °C)
Insolation (S⊕)
38.40
Earth = 1.00
Earth Similarity (ESI)
0.291
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
Murgas et al. 2021Instrument
TESS CCD Array
Publication
2021-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-674
Spectral Class
M-type red dwarf
Effective Temperature
3,514 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.420 R☉
Stellar Mass
0.420 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.810 dex
Stellar density
10.140 g/cm³
Systemic radial velocity
13.49 km/s
Rotational v·sin i
0.40 km/s
Rotation period
52.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
21.670 mas
Total Proper Motion
163.313 mas/yr
PM Right Ascension
-163.27 mas/yr
PM Declination
-3.77 mas/yr
Galactic Cartesian (pc)
x = -0.771 · y = 0.213 · z = -0.600
Equatorial (J2000)
RA 164.58656° · Dec -36.85811°
Galactic ℓ, b
279.030° · 20.710°
Ecliptic λ, β
183.223° · -39.415°
HTM-20 index
193089446
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