102554 1999 US21 (Asteroid)
From South El Monte , 102554 1999 US21 is visible in the morning sky, becoming accessible around 01:15, when it reaches an altitude of 21° above your south-eastern horizon. It will then reach its highest point in the sky at 04:00, 34° above your southern horizon. It will be lost to dawn twilight around 04:34, 33° above your southern horizon.
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Name
102554 1999 US21
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Object type
Asteroid
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Current position
| Computed for: | 08 July 2025 |
| Right ascension: | 22h14m [1] |
| Declination: | −21°32' [1] |
| Constellation: | Aquarius |
| Magnitude: | 21.01 (V) [1] |
| Distance: | 1.80 AU 14.97 lightmin [1] |
| Angular motion (speed): | 18.23 arcmin/day[1] |
| Angular motion (pos ang): | 244.9° |
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 |