The fastest rotational velocity of any known planet or star depends on their individual characteristics. Here are a few examples:
Planets:
- Jupiter: Jupiter is the fastest rotating planet in our solar system. It has an equatorial rotational velocity of approximately 45,300 kilometers per hour (28,200 miles per hour).
- Saturn: Saturn is the second fastest rotating planet in our solar system. It has an equatorial rotational velocity of about 35,500 kilometers per hour (22,100 miles per hour).
- Earth: Earth rotates at a speed of approximately 1,670 kilometers per hour (1,040 miles per hour) at the equator.
Stars:
- Regulus: Regulus, the brightest star in the constellation Leo, has a rapid rotational velocity of about 317 kilometers per second (715,000 miles per hour). This makes it one of the fastest rotating stars known.
- Vega: Vega, a prominent star in the constellation Lyra, has a rotational velocity of around 274 kilometers per second (615,000 miles per hour).
It's important to note that these values represent some of the fastest known rotational velocities, but there may be other celestial objects with even higher rotational speeds that have not been discovered or measured yet.