Key parameters at a glance
- A radius of 9.66 Earth radii
- A mass of 99.00 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 4.537 days
- Semi-major axis 0.0570 AU
- Equilibrium temperature 1,278 K (1005 °C)
- Distance from Earth 1,040.56 light-years
- Earth Similarity Index 0.111
- Travel time at Voyager 1 speed 18,350,187 years
TOI-1298 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#28of 574
top 4.7%
This planet
9.66R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1298 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.66 | 11.21 |
| Mass (M⊕) | 1.00 | 99.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 732.01 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 99.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 237104103
Gaia DR2
Gaia DR2 1647136729864424576
Gaia DR3
Gaia DR3 1647136729864424576
System
TOI-1298
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.54 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0570 AU.
Transit Fingerprint
Depth
0.420 %
Duration
4.029 h
Impact parameter b
0.272
Rp / R★
0.060916
Transit midpoint (BJD)
2,458,934.1225
Photometric dip
Transit produces a flux drop of 4,200 ppm lasting ≈ 4.03 h.
Extended Orbital Architecture
Planet / star radius ratio
0.060916
Semi-major axis / stellar radius
9.000
Impact parameter (b)
0.272
RV semi-amplitude (K)
33.600 m/s
Transit mid-time (BJD)
2,458,934.1225
Long. of periastron (ω)
57.00°
Angular separation (arcsec)
0.17900
Eq. Temperature
1,278K
(1005 °C)
Insolation (S⊕)
732.01
Earth = 1.00
Earth Similarity (ESI)
0.111
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Moutou 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-1298
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,752 K — cooler than the Sun (5,778 K)
Estimated Age
4.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.454 R☉
Stellar Mass
1.219 M☉
Metallicity [Fe/H]
0.40
Extended Stellar Properties
Surface gravity (log g)
4.194 dex
Stellar density
0.550 g/cm³
Systemic radial velocity
-55.56 km/s
Rotational v·sin i
4.60 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.106 mas
Total Proper Motion
57.061 mas/yr
PM Right Ascension
-36.41 mas/yr
PM Declination
43.93 mas/yr
Galactic Cartesian (pc)
x = -0.163 · y = -0.297 · z = 0.941
Equatorial (J2000)
RA 241.32290° · Dec 70.19004°
Galactic ℓ, b
103.887° · 38.977°
Ecliptic λ, β
148.042° · 78.950°
HTM-20 index
1388448575
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