Key parameters at a glance
- A radius of 6.81 Earth radii
- A mass of 27.40 Earth masses
- Surface gravity around 0.59 g
- An orbital period of 4.360 days
- Semi-major axis 0.0510 AU
- Equilibrium temperature 952 K (679 °C)
- Distance from Earth 550.34 light-years
- Earth Similarity Index 0.160
- Travel time at Voyager 1 speed 9,705,233 years
TOI-1248 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#219of 574
top 38.0%
This planet
6.81R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1248 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 6.81 | 11.21 |
| Mass (M⊕) | 1.00 | 27.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.47 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 202.07 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 27.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 232612416
Gaia DR2
Gaia DR2 1438888501713397760
Gaia DR3
Gaia DR3 1438888501713397760
System
TOI-1248
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.36 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0510 AU.
Transit Fingerprint
Depth
0.559 %
Duration
2.314 h
Impact parameter b
0.596
Rp / R★
0.071866
Transit midpoint (BJD)
2,458,687.1212
Photometric dip
Transit produces a flux drop of 5,592 ppm lasting ≈ 2.31 h.
Extended Orbital Architecture
Planet / star radius ratio
0.071866
Impact parameter (b)
0.596
RV semi-amplitude (K)
11.500 m/s
Transit mid-time (BJD)
2,458,687.1212
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.30200
Eq. Temperature
952K
(679 °C)
Insolation (S⊕)
202.07
Earth = 1.00
Earth Similarity (ESI)
0.160
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
Polanski et al. 2024Instrument
TESS CCD Array
Publication
2024-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1248
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,205 K — cooler than the Sun (5,778 K)
Estimated Age
5.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.869 R☉
Stellar Mass
0.904 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.515 dex
Stellar density
1.931 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
5.898 mas
Total Proper Motion
81.080 mas/yr
PM Right Ascension
-2.87 mas/yr
PM Declination
-81.03 mas/yr
Galactic Cartesian (pc)
x = -0.086 · y = -0.444 · z = 0.892
Equatorial (J2000)
RA 259.02359° · Dec 63.10561°
Galactic ℓ, b
92.713° · 34.705°
Ecliptic λ, β
211.445° · 84.206°
HTM-20 index
-578651444
Similar Worlds
Kepler-857 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.80 R⊕ · 3,207.8 ly
HATS-37 A b
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HD 34445 f
Neptune-like · G-type yellow (Sun-like)
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Kepler-799 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.88 R⊕ · 4,922.0 ly
HATS-38 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.88 R⊕ · 1,120.4 ly
HD 25912 b
Neptune-like · G-type yellow (Sun-like)
Radius 6.90 R⊕ · 160.4 ly