Astronomical evidence
Kepler-453 b circles a binary star. The discovery analysis gives a planetary period of 240.503 ± 0.053 days and a radius of 6.204 ± 0.039 Earth radii. Those values describe a large planet whose orbit surrounds both host stars. Circumbinary transits are shaped by the movement of the stars as well as the planet. The target being crossed is not fixed in the sky, so transit timing and duration require a model of the whole configuration. A simple sequence of equal intervals is an incomplete description of this geometry. The catalog mass of 16 Earth masses is an upper limit. It cannot be combined with the radius as though both were exact measurements to obtain a uniquely known density. Limits and asymmetric uncertainties are retained in the accompanying catalog table.
The illustrated viewpoint
The foreground moon is entirely fictional. The two stellar lights reflect the real binary architecture, but their apparent sizes, separation and simultaneous visibility are not calculated for a specified epoch. No moon or surface ecosystem is established.
The foreground moon is entirely fictional. The two stellar lights reflect the real binary architecture, but their apparent sizes, separation and simultaneous visibility are not calculated for a specified epoch. No moon or surface ecosystem is established. All depicted life and technology are fictional.
Catalog measurements & sources
Host: Kepler-453. Snapshot: 25 September 2026. Errors, limits and source provenance are retained. Calculated values and model estimates are not direct measurements. Unknown is not zero; equilibrium temperature is not surface temperature.
| Quantity / unit | Value / reported errors | Source |
|---|---|---|
| Radius · Earth radii | 6.204 (+0.039 / -0.039) | Welsh et al. 2015 |
| Mass · Earth masses | ≤ 16 | Welsh et al. 2015 |
| Density · g/cm³ | Unknown | Not supplied |
| Orbital period · days | 240.503 (+0.053 / -0.053) | Welsh et al. 2015 |
| Orbital semimajor axis · AU | 0.7903 (+0.0028 / -0.0028) | Welsh et al. 2015 |
| Eccentricity | 0.0359 (+0.0088 / -0.0088) | Welsh et al. 2015 |
| Inclination · degrees | 89.4429 (+0.0091 / -0.0091) | Welsh et al. 2015 |
| Irradiation · Earth flux | 0.9636 (+0.0196 / -0.0196) | Calculated Value |
| Equilibrium temperature · K | 273.62 (+5.29 / -5.29) | Calculated Value |
| Stellar effective temperature · K | 5527 (+100 / -100) | Welsh et al. 2015 |
| Stellar radius · Solar | 0.833 (+0.011 / -0.011) | Welsh et al. 2015 |
| Stellar mass · Solar | 0.944 (+0.01 / -0.01) | Welsh et al. 2015 |
| Stellar luminosity · log Solar | -0.2205 (+0.00821 / -0.00837) | Gaia DR2 |
| Stellar age · Gyr | ≤ 2.49 (+0.38 / -0.38) | Welsh et al. 2015 |
| Stellar metallicity · dex | 0.09 (+0.1 / -0.1) | Welsh et al. 2015 |
| Distance · pc | 442.846 (+2.7245 / -2.7245) | TICv8 |