4035 Thestor (Asteroid)
From South El Monte , 4035 Thestor is visible in the dawn sky, rising at 03:13 (PDT) – 3 hours and 55 minutes before the Sun – and reaching an altitude of 33° above the south-eastern horizon before fading from view as dawn breaks at around 06:08.
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Name
4035 Thestor
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Object type
Asteroid
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Current position
| Computed for: | 31 October 2025 |
| Right ascension: | 10h52m [1] |
| Declination: | −04°23' [1] |
| Constellation: | Leo |
| Magnitude: | 17.55 (V) [1] |
| Distance: | 5.77 AU 48.01 lightmin [1] |
| Angular motion (speed): | 4.40 arcmin/day[1] |
| Angular motion (pos ang): | 288.3° |
Orbital elements [1]
| Semi-major axis: | 5.28 AU |
| Eccentricity: | 0.056651 |
| Inclination: | 12.13° |
| Longitude ascending node: | 233.71° |
| Argument of perihelion: | 199.89° |
| Epoch of elements: | 25 January 2025 |
| Mean Anomaly at epoch: | 54.42° |
| Absolute mag (H): | 9.56 [1] |
| Slope parameter (G): | 0.15 [1] |
Derived quantities
| Perihelion: | 4.98 AU |
| Aphelion: | 5.58 AU |
| Orbital period: | 12.12 years |