Key parameters at a glance
- A radius of 11.10 Earth radii
- A mass of 70.56 Earth masses
- Surface gravity around 0.57 g
- An orbital period of 4.631 days
- Semi-major axis 0.0549 AU
- Equilibrium temperature 1,211 K (938 °C)
- Distance from Earth 577.68 light-years
- Earth Similarity Index 0.099
- Travel time at Voyager 1 speed 10,187,404 years
TOI-1273 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1656of 1771
top 93.5%
This planet
11.10R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1273 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.10 | 11.21 |
| Mass (M⊕) | 1.00 | 70.56 | 317.83 |
| Density (g/cm³) | 5.51 | 0.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.57 | 2.53 |
| Insolation (S⊕) | 1.00 | 225.01 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 70.558 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 445859771
Gaia DR2
Gaia DR2 1611685760565507840
Gaia DR3
Gaia DR3 1611685004650291840
System
TOI-1273
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.63 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0549 AU.
Transit Fingerprint
Depth
0.486 %
Duration
1.435 h
Impact parameter b
0.958
Rp / R★
0.096000
Transit midpoint (BJD)
2,458,712.3468
Photometric dip
Transit produces a flux drop of 4,860 ppm lasting ≈ 1.44 h.
Extended Orbital Architecture
Planet / star radius ratio
0.096000
Impact parameter (b)
0.958
RV semi-amplitude (K)
26.700 m/s
Transit mid-time (BJD)
2,458,712.3468
Long. of periastron (ω)
110.00°
Angular separation (arcsec)
0.31000
Eq. Temperature
1,211K
(938 °C)
Insolation (S⊕)
225.01
Earth = 1.00
Earth Similarity (ESI)
0.099
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
Serrano Bell et al. 2024Instrument
TESS CCD Array
Publication
2024-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1273
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,690 K — cooler than the Sun (5,778 K)
Estimated Age
3.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.060 R☉
Stellar Mass
1.060 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.370 dex
Stellar density
1.181 g/cm³
Rotational v·sin i
2.80 km/s
Rotation period
42.00 days
Activity index (log R'HK)
-5.000
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
5.617 mas
Total Proper Motion
57.870 mas/yr
PM Right Ascension
37.07 mas/yr
PM Declination
-44.44 mas/yr
Galactic Cartesian (pc)
x = -0.434 · y = -0.294 · z = 0.852
Equatorial (J2000)
RA 214.12086° · Dec 58.39025°
Galactic ℓ, b
103.381° · 55.392°
Ecliptic λ, β
170.958° · 63.937°
HTM-20 index
-1164673180
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