3548 Eurybates
3548 Eurybates (/jʊˈrɪbətiːz/ yə-RIB-ə-teez) is a carbonaceous Jupiter trojan from the Greek camp and the parent body of the Eurybates family, approximately 68 kilometers (42 miles) in diameter. It is a target to be visited by the Lucy mission in August 2027. Discovered during the second Palomar–Leiden Trojan survey in 1973, it was later named after Eurybates from Greek mythology. This C-type asteroid is among the 60 largest known Jupiter trojans and has a rotation period of 8.7 hours. Eurybates has one kilometer-sized satellite, named Queta, that was discovered in images taken by the Hubble Space Telescope in September 2018.
Eurybates and its satellite Queta (circled) imaged by the Hubble Space Telescope in 2019–2020 | |
| Discovery | |
|---|---|
| Discovered by | C. J. van Houten I. van Houten-G. Tom Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 19 September 1973 |
| Designations | |
| (3548) Eurybates | |
| Pronunciation | /jʊˈrɪbətiːz/ |
Named after | Eurybates (Greek mythology) |
| 1973 SO · 1954 CB 1957 JX · 1978 EE5 1985 TZ | |
| Jupiter trojan Greek Eurybates binary | |
| Adjectives | Eurybatian |
| Orbital characteristics | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 0 | |
| Earliest precovery date | 9 February 1954 |
| Aphelion | 5.680 AU |
| Perihelion | 4.733 AU |
| 5.206 AU | |
| Eccentricity | 0.0909 |
| 11.88 yr (4,339 d) | |
| 27.507° | |
| 0° 4m 58.682s / day | |
| Inclination | 8.054° |
| 43.542° | |
| 27.481° | |
| Jupiter MOID | 0.1092 AU |
| TJupiter | 2.972 |
| Physical characteristics | |
| Dimensions | 77.5 × 71.3 × 61.8 km |
Mean diameter | 69.3±1.4 km (area equivalent) |
| Mass | (1.51±0.03)×1017 kg |
Mean density | 1.1±0.3 g/cm3 |
| 8.7027283±0.0000029 h | |
| 150° (wrt ecliptic) 158° (wrt orbit) | |
Pole ecliptic latitude | −60° |
Pole ecliptic longitude | 320° |
| 0.044±0.003 | |
| C B–V = 0.739±0.026 V–R = 0.384±0.021 V–I = 0.355±0.015 | |
| 16.2 to 18.1 | |
| 9.800±0.007 | |
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