It is a outer planet
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Jupiter has the shortest day among the planets because it has the fastest rotation on its axis, completing one rotation in about 10 hours. This rapid rotation speed is a result of Jupiter's large size and mass, which causes faster spinning due to conservation of angular momentum.
The shortest planetary "day" (period of rotation) is that of the largest planet, Jupiter.With an equatorial rotation speed of over 12.6 km/sec (28,000 mph), Jupiter spins once on its axis every 9.925 Earth hours. (about 9 hours, 55 1/2 minutes)
Jupiter has the shortest day among the planets in our solar system, with a day lasting approximately 9.9 hours.
The time between sunrise and sunset would be shortest on Mercury. This is because Mercury has a slow rotation period compared to its orbit around the sun, resulting in longer days and shorter intervals between sunrise and sunset.
Saturn's year lasts 29.5 Earth years, however Saturn's day lasts only 10.6 Earth Hours. That is less than half of one Earth day.
Of the four inner planets (Mercury, Venus, Earth, and Mars), Earth has the shortest day at 23 hours and 56 minutes sidereal rotation period. That's the "sidereal day". The day that lasts exactly 24 hours is called the "solar day". For both "days", Earth has the shortest day.