Key parameters at a glance
- A radius of 2.78 Earth radii
- A mass of 8.50 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 16.710 days
- Equilibrium temperature 824 K (551 °C)
- Distance from Earth 176.04 light-years
- Earth Similarity Index 0.296
- Travel time at Voyager 1 speed 3,104,455 years
1 sibling around TOI-1774
TOI-1774.01 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-1774.01 this | Sub-Neptune | 2.78 | 8.50 | 16.710 | 824 | 2021 |
| HD 85426 c | Sub-Neptune | 3.19 | 10.30 | 35.730 | 640 | 2026 |
TOI-1774.01 Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#768of 1978
top 38.8%
This planet
2.78R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1774.01 | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.78 | 11.21 |
| Mass (M⊕) | 1.00 | 8.50 | 317.83 |
| Density (g/cm³) | 5.51 | 2.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 73.76 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 8.500 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 85426
HIP
HIP 48443
TIC
TIC 4897275
Gaia DR2
Gaia DR2 796063843195758208
Gaia DR3
Gaia DR3 796063843195758208
System
TOI-1774
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 16.71 Earth days (4.6% of a terrestrial year) on a nearly circular orbit.
Transit Fingerprint
Depth
0.062 %
Duration
5.410 h
Impact parameter b
0.240
Transit midpoint (BJD)
2,459,674.4131
Photometric dip
Transit produces a flux drop of 615 ppm lasting ≈ 5.41 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
24.300
Impact parameter (b)
0.240
RV semi-amplitude (K)
2.200 m/s
Transit mid-time (BJD)
2,459,674.4131
Long. of periastron (ω)
282.00°
Eq. Temperature
824K
(551 °C)
Insolation (S⊕)
73.76
Earth = 1.00
Earth Similarity (ESI)
0.296
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Giacalone et al. 2021Instrument
TESS CCD Array
Publication
2021-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1774
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,746 K — cooler than the Sun (5,778 K)
Estimated Age
7.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.130 R☉
Stellar Mass
0.991 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.330 dex
Stellar density
0.967 g/cm³
Rotational v·sin i
2.00 km/s
Rotation period
25.00 days
Activity index (log R'HK)
-4.920
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
18.499 mas
Total Proper Motion
304.356 mas/yr
PM Right Ascension
264.67 mas/yr
PM Declination
-150.27 mas/yr
Galactic Cartesian (pc)
x = -0.695 · y = 0.432 · z = 0.575
Equatorial (J2000)
RA 148.16193° · Dec 35.11101°
Galactic ℓ, b
189.721° · 51.241°
Ecliptic λ, β
138.043° · 20.858°
HTM-20 index
-1825106223
Similar Worlds
Kepler-58 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.78 R⊕ · 3,161.3 ly
Kepler-24 e
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.78 R⊕ · 3,773.0 ly
Kepler-870 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.78 R⊕ · 4,107.8 ly
Kepler-894 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.78 R⊕ · 3,792.9 ly
Kepler-799 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.78 R⊕ · 4,922.0 ly
Kepler-1906 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.78 R⊕ · 4,437.8 ly