102554 1999 US21 (Asteroid)
Finder chart
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From South El Monte , 102554 1999 US21 will become visible at around 17:48 (PST), 35° above your south-western horizon, as dusk fades to darkness. It will then sink towards the horizon, setting at 21:35.
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Name
102554 1999 US21
|
Object type
Asteroid
|
Current position
| Computed for: | 15 December 2025 |
| Right ascension: | 22h06m [1] |
| Declination: | −16°38' [1] |
| Constellation: | Aquarius |
| Magnitude: | 22.31 (V) [1] |
| Distance: | 2.99 AU 24.90 lightmin [1] |
Orbital elements [1]
| Semi-major axis: | 2.44 AU |
| Eccentricity: | 0.115526 |
| Inclination: | 6.84° |
| Longitude ascending node: | 35.55° |
| Argument of perihelion: | 139.00° |
| Epoch of elements: | 21 Nov 2025 |
| Mean Anomaly at epoch: | 163.89° |
| Absolute mag (H): | 16.78 [1] |
| Slope parameter (G): | 0.15 [1] |
Derived quantities
| Perihelion: | 2.16 AU |
| Aphelion: | 2.73 AU |
| Orbital period: | 3.82 years |
Visibility from South El Monte
All times shown in South El Monte local time.