102554 1999 US21 (Asteroid)

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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.

Name 102554 1999 US21
Object type Asteroid
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

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