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4217 Engelhardt

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4217 Engelhardt, provisional designation 1988 BO2, is a stony Phocean asteroid and a potentially binary system from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 24 January 1988, by American astronomer Carolyn Shoemaker at Palomar Observatory in California, and later named after German mineralogist Wolf von Engelhardt.[12]

4217 Engelhardt
Discovery [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date 24 January 1988
Designations
(4217) Engelhardt
Named after
 Wolf von Engelhardt
(German mineralogist)[2]
1988 BO2 · 1944 RL
1951 RY1 · 1970 AA
main-belt · Phocaea [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 72.73 yr (26,563 days)
Aphelion 2.8045 AU
Perihelion 1.8246 AU
2.3145 AU
Eccentricity 0.2117
3.52 yr (1,286 days)
272.23°
0° 16m 47.64s / day
Inclination 23.129°
355.44°
348.79°
Known satellites 1 (P: 36.03 h)[5][lower-alpha 1]
Physical characteristics
Dimensions 7.34±1.36 km[6]
8.742±0.356 km[7][8]
9.16±1.0 km[9]
9.24 km (derived)[3]
3.066±0.001h[10]
3.0661±0.0002 h[5][lower-alpha 1]
0.2108±0.052[9]
0.231±0.046[7][8]
0.2489 (derived)[3]
0.37±0.17[6]
S [3][11]
12.10±0.67[11] · 12.20[6] · 12.3[1][3] · 12.50[7][9]

    . . . 4217 Engelhardt . . .

    Engelhardt is a stony S-type asteroid and a member of the Phocaea family (701).[4] It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,286 days). Its orbit has an eccentricity of 0.21 and an inclination of 23° with respect to the ecliptic.[1]

    It was first identified as 1944 RL at Turku Observatory in 1944, extending the body’s observation arc by 44 years prior to its official discovery observation at Palomar.[12] It will pass about 0.0017 AU (250,000 km) from Earth threatening asteroid (29075) 1950 DA in 2736.[13]

    . . . 4217 Engelhardt . . .

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    . . . 4217 Engelhardt . . .

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