137373 1999 TD128 (Asteroid)
From South El Monte , 137373 1999 TD128 is visible in the evening sky, becoming accessible around 19:54 (PDT), 28° above your southern horizon, as dusk fades to darkness. It will then reach its highest point in the sky at 20:39, 29° above your southern horizon. It will continue to be observable until around 22:53, when it sinks below 21° above your south-western horizon.
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Name
137373 1999 TD128
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Object type
Asteroid
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Current position
| Computed for: | 17 September 2025 |
| Right ascension: | 19h37m [1] |
| Declination: | −26°10' [1] |
| Constellation: | Sagittarius |
| Magnitude: | 20.96 (V) [1] |
| Distance: | 1.72 AU 14.29 lightmin [1] |
| Angular motion (speed): | 19.28 arcmin/day[1] |
| Angular motion (pos ang): | 260.1° |
Orbital elements [1]
| Semi-major axis: | 2.22 AU |
| Eccentricity: | 0.104653 |
| Inclination: | 3.98° |
| Longitude ascending node: | 10.53° |
| Argument of perihelion: | 72.95° |
| Epoch of elements: | 25 January 2025 |
| Mean Anomaly at epoch: | 170.20° |
| Absolute mag (H): | 16.85 [1] |
| Slope parameter (G): | 0.15 [1] |
Derived quantities
| Perihelion: | 1.99 AU |
| Aphelion: | 2.46 AU |
| Orbital period: | 3.31 years |