Key parameters at a glance
- A radius of 1.46 Earth radii
- A mass of 5.60 Earth masses
- Surface gravity around 2.61 g
- An orbital period of 0.438 days
- Semi-major axis 0.0108 AU
- Equilibrium temperature 1,936 K (1663 °C)
- Distance from Earth 369.15 light-years
- Earth Similarity Index 0.123
- Travel time at Voyager 1 speed 6,509,900 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-1798
TOI-1798.02 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-1798.02 this | Super-Earth | 1.46 | 5.60 | 0.438 | 1,936 | 2024 |
| TOI-1798.01 | Sub-Neptune | 2.45 | 6.50 | 8.022 | 734 | 2024 |
TOI-1798.02 Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#818of 1176
top 69.5%
This planet
1.46R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-1798.02 | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.46 | 11.21 |
| Mass (M⊕) | 1.00 | 5.60 | 317.83 |
| Density (g/cm³) | 5.51 | 11.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.61 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,345.44 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.600 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 198153540
Gaia DR2
Gaia DR2 1505890751741673856
Gaia DR3
Gaia DR3 1505890751741673856
System
TOI-1798
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 10.5 hours long on a nearly circular orbit at a mean orbital distance of 0.0108 AU.
Transit Fingerprint
Depth
0.029 %
Duration
1.215 h
Impact parameter b
0.316
Rp / R★
0.017060
Transit midpoint (BJD)
2,459,691.3135
Photometric dip
Transit produces a flux drop of 291 ppm lasting ≈ 1.22 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017060
Semi-major axis / stellar radius
2.962
Impact parameter (b)
0.316
RV semi-amplitude (K)
5.240 m/s
Transit mid-time (BJD)
2,459,691.3135
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.09530
Eq. Temperature
1,936K
(1663 °C)
Insolation (S⊕)
3,345.44
Earth = 1.00
Earth Similarity (ESI)
0.123
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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
Hord et al. 2024Instrument
TESS CCD Array
Publication
2024-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1798
Spectral Class
K-type orange
Effective Temperature
5,165 K — cooler than the Sun (5,778 K)
Estimated Age
2.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.870 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.572 dex
Stellar density
2.422 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
8.807 mas
Total Proper Motion
38.512 mas/yr
PM Right Ascension
-27.34 mas/yr
PM Declination
-27.12 mas/yr
Galactic Cartesian (pc)
x = -0.589 · y = -0.355 · z = 0.726
Equatorial (J2000)
RA 211.09394° · Dec 46.51928°
Galactic ℓ, b
91.169° · 65.856°
Ecliptic λ, β
183.629° · 53.812°
HTM-20 index
-1485569739
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