| 释义 |
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{{for|the satellite of Jupiter|Adrastea (moon)}}{{Infobox planet
| minorplanet=yes
| background=#D6D6D6
| name=239 Adrastea
| discoverer=Johann Palisa
| discovered=18 August 1884
| mpc_name=(239) Adrastea
| alt_names=A915 TD, 1955 MK1,
1956 UJ
| named_after=Adrasteia
| mp_category=Main belt
| epoch=31 July 2016 (JD 2457600.5)
| semimajor={{Convert|2.96616|AU|Gm|abbr=on}}
| perihelion={{Convert|2.2695|AU|Gm|abbr=on}}
| aphelion={{Convert|3.66279|AU|Gm|abbr=on|lk=on}}
| eccentricity=0.23486
| period=5.11 yr (1865.9 d)
| inclination=6.1746°
| asc_node=180.634°
| arg_peri=210.15°
| mean_anomaly=233.617°
| avg_speed=17.25 km/s
| dimensions={{val|41.52|1.4|ul=km}}
| mass=
| density=
| rotation={{Convert|18.4707|h|d|abbr=on|lk=on}}
| spectral_type=unknown
| abs_magnitude=10.4
| albedo={{val|0.0777|0.006}}
| single_temperature=unknown
| mean_motion={{Deg2DMS|0.19294|sup=ms}} / day
| orbit_ref=
| observation_arc=131.66 yr (48087 d)
| uncertainty=0
}}Adrastea (minor planet designation: 239 Adrastea) is a main belt asteroid. It was discovered by Johann Palisa on 18 August 1884 in Vienna. It is named after the Greek nymph Adrasteia. The asteroid is roughly 42 km in diameter.References
}} External links - The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- {{JPL small body}}
{{Minor planets navigator|238 Hypatia|number=239|240 Vanadis}}{{Small Solar System bodies}}{{DEFAULTSORT:000239}}{{beltasteroid-stub}} 5 : Background asteroids|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1884|Discoveries by Johann Palisa |