129839 1999 RH21 (Asteroid)
From South El Monte , 129839 1999 RH21 is visible in the morning sky, becoming accessible around 20:54, when it reaches an altitude of 21° above your north-eastern horizon. It will then reach its highest point in the sky at 02:33, 89° above your southern horizon. It will be lost to dawn twilight around 05:11, 57° above your western horizon.
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Name
129839 1999 RH21
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Object type
Asteroid
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Current position
| Computed for: | 04 November 2025 |
| Right ascension: | 05h37m [1] |
| Declination: | +33°59' [1] |
| Constellation: | Auriga |
| Magnitude: | 19.96 (V) [1] |
| Distance: | 1.58 AU 13.11 lightmin [1] |
| Angular motion (speed): | 22.49 arcmin/day[1] |
| Angular motion (pos ang): | 267.6° |
Orbital elements [1]
| Semi-major axis: | 2.63 AU |
| Eccentricity: | 0.202580 |
| Inclination: | 7.93° |
| Longitude ascending node: | 6.67° |
| Argument of perihelion: | 347.54° |
| Epoch of elements: | 25 January 2025 |
| Mean Anomaly at epoch: | 347.46° |
| Absolute mag (H): | 16.18 [1] |
| Slope parameter (G): | 0.15 [1] |
Derived quantities
| Perihelion: | 2.09 AU |
| Aphelion: | 3.16 AU |
| Orbital period: | 4.25 years |