102554 1999 US21 (Asteroid)
From South El Monte , 102554 1999 US21 is visible in the morning sky, becoming accessible around 01:23, when it reaches an altitude of 21° above your south-eastern horizon. It will then reach its highest point in the sky at 04:08, 34° above your southern horizon. It will be lost to dawn twilight around 04:33, 34° above your southern horizon.
Name
102554 1999 US21
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Object type
Asteroid
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Current position
Computed for: | 06 July 2025 |
Right ascension: | 22h15m [1] |
Declination: | −21°23' [1] |
Constellation: | Aquarius |
Magnitude: | 21.05 (V) [1] |
Distance: | 1.82 AU 15.10 lightmin [1] |
Angular motion (speed): | 18.12 arcmin/day[1] |
Angular motion (pos ang): | 244.8° |
Orbital elements [1]
Semi-major axis: | 2.44 AU |
Eccentricity: | 0.115322 |
Inclination: | 6.84° |
Longitude ascending node: | 35.56° |
Argument of perihelion: | 139.02° |
Epoch of elements: | 25 January 2025 |
Mean Anomaly at epoch: | 86.45° |
Absolute mag (H): | 16.79 [1] |
Slope parameter (G): | 0.15 [1] |
Derived quantities
Perihelion: | 2.16 AU |
Aphelion: | 2.73 AU |
Orbital period: | 3.82 years |