102554 1999 US21 (Asteroid)
From South El Monte , 102554 1999 US21 is visible in the evening sky, becoming accessible around 19:16 (PDT), 29° above your southern horizon, as dusk fades to darkness. It will then reach its highest point in the sky at 20:28, 32° above your southern horizon. It will continue to be observable until around 22:58, when it sinks below 21° above your south-western horizon.
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Name
102554 1999 US21
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Object type
Asteroid
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Current position
| Computed for: | 15 October 2025 |
| Right ascension: | 21h15m [1] |
| Declination: | −23°46' [1] |
| Constellation: | Capricornus |
| Magnitude: | 21.63 (V) [1] |
| Distance: | 2.16 AU 18.00 lightmin [1] |
| Angular motion (speed): | 14.94 arcmin/day[1] |
| Angular motion (pos ang): | 251.6° |
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 |