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Discovery[1] and designation
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| Discovered by | Freimut Börngen |
| Discovery date | October 27, 1973 |
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Designations
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| Named after | Protesilaus |
| Alternate name(s) | 1973 UF5 |
| Minor planet category |
Jupiter Trojan |
| Epoch February 4, 2008 (JD 2454500.5) | |
| Aphelion | 877.796 Gm (5.868 AU) |
| Perihelion | 694.827 Gm (4.645 AU) |
| Semi-major axis | 786.312 Gm (5.256 AU) |
| Eccentricity | 0.116 |
| Orbital period | 4401.516 d (12.05 a) |
| Average orbital speed | 12.95 km/s |
| Mean anomaly | 212.942° |
| Inclination | 23.322° |
| Longitude of ascending node | 26.429° |
| Dimensions | ? km |
| Mass | ?×10? kg |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | ? m/s² |
| Equatorial escape velocity | ? km/s |
| Sidereal rotation period |
? d |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.10 |
| Temperature | ~121 K |
| Spectral type | ? |
| Absolute magnitude (H) | 9.0 |
3540 Protesilaos is a Jupiter Trojan asteroid that orbits in the L4 Lagrangian point of the Sun-Jupiter system, in the "Greek Camp" of Trojan asteroids. It was named after the Greek hero Protesilaus, who fought during the Trojan War. It was discovered by Freimut Börngen at the Karl Schwarzschild Observatory in Tautenburg, Germany on October 27, 1973.
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