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Neptune: 0.67125 days [3] 0 d 16 h 6 m 36 s: 0.671 25 d (16 h 6 m 36 s) [10] Pluto: ... Day length fluctuations; Earth's rotation periods; List of slow rotators ...
Neptune's mass of 1.0243 × 10 26 kg [8] is intermediate between Earth and the larger gas giants: it is 17 times that of Earth but just 1/19th that of Jupiter. [g] Its gravity at 1 bar is 11.15 m/s 2, 1.14 times the surface gravity of Earth, [71] and surpassed only by Jupiter. [72] Neptune's equatorial radius of 24,764 km [11] is nearly four ...
NASA illustration detailing the studies of the proposed Trident mission Neptune (top) and Triton (bottom) three days after flyby of Voyager 2. The orbital properties of Triton were already determined with high accuracy in the 19th century. It was found to have a retrograde orbit, at a very high angle of inclination to the plane of Neptune's orbit.
The radio instruments on board found that Neptune's day lasts 16 hours and 6.7 minutes. Neptune's rings had been observed from Earth many years prior to Voyager 2 's visit, but the close inspection revealed that the ring systems were full circle and intact, and a total of four rings were counted. [4] Voyager 2 discovered six new small moons ...
In recent decades, the average length of a solar day on Earth has been about 86,400.002 seconds [2] (24.000 000 6 hours). There are currently about 365.2421875 solar days in one mean tropical year . Ancient custom has a new day starting at either the rising or setting of the Sun on the local horizon (Italian reckoning, for example, being 24 ...
All but the outer two are within Neptune-synchronous orbit (Neptune's rotational period is 0.6713 day or 16 hours [20]) and thus are being tidally decelerated. Naiad, the closest regular moon, is also the second smallest among the inner moons (following the discovery of Hippocamp), whereas Proteus is the largest regular moon and the second ...
The last time Neptune's rings were seen in detail was during a flyby in 1989 by NASA's Voyager 2 spacecraft as it journeyed beyond the solar system and into interstellar space. That historic flyby ...
57.996 ks: one day on planet Neptune. 62.064 ks: one day on Uranus. 86.399 ks (23 h 59 min 59 s): The length of one day with a removed leap second on UTC time scale. Such has not yet occurred. 86.4 ks (24 h): The length of one day of Earth by standard.