HD 63433 d
HD 63433 d (TOI-1726 d) is a confirmed exoplanet orbiting HD 63433, a Sun-like star located 73 light-years away in the constellation Gemini. It was the third (and most recent) exoplanet to be discovered in orbit around this star; the other two were HD 63433 b and c, discovered in 2020. Its radius is measured at around 1.1 R🜨, which makes it similar to the Earth in size. Orbiting its star at a distance of 0.0503 astronomical units (7,520,000 km), it is the innermost planet orbiting HD 63433, and completes an orbit around it just every 4 days. Due to the proximity of its star, the planet is scorching hot, having a temperature estimated at 1260 °C at daytime. The proximity of its star also causes it to be tidally locked.
| Discovery | |
|---|---|
| Discovered by | Capistrant, Soares-Furtado et al. (THYME) |
| Discovery date | 10 January 2024 |
| Transit | |
| Designations | |
| TOI-1726 d, BD+27 1490 d, HIP 38228 d, V377 Geminorum d | |
| Orbital characteristics | |
| 0.0503+0.0025 −0.0027 AU | |
| Eccentricity | 0.16+0.36 −0.12 |
| 4.20975+0.000012 −0.000023 d | |
| Inclination | 88.73°+0.85° −1.06° |
| Star | HD 63433 |
| Physical characteristics | |
Mean radius | 1.073+0.046 −0.044 R🜨 |
| Temperature | 1040±40 K (767 ± 40°C) (mean),, 1,530 K (1,260 °C) (daytime) |
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