1691 Oort
1691 Oort, provisional designation 1956 RB, is a rare-type carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 33 kilometers in diameter.
Lightcurve-based 3D-model of Oort | |
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth I. Groeneveld |
| Discovery site | Heidelberg Obs. |
| Discovery date | 9 September 1956 |
| Designations | |
MPC designation | (1691) Oort |
Named after | Jan Oort (astronomer) |
Alternative designations | 1956 RB · 1945 TD 1947 DA · 1950 PZ 1950 RU · 1951 XW 1955 MW · 1956 SD 1964 DA · A917 TD |
Minor planet category | main-belt · Themis |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 71.42 yr (26,086 days) |
| Aphelion | 3.7153 AU |
| Perihelion | 2.6084 AU |
Semi-major axis | 3.1618 AU |
| Eccentricity | 0.1750 |
Orbital period (sidereal) | 5.62 yr (2,054 days) |
Mean anomaly | 240.25° |
| Inclination | 1.0860° |
Longitude of ascending node | 174.55° |
| 232.69° | |
| Physical characteristics | |
| Dimensions | 27.13 km (calculated) 33.163±0.534 km 33.644±0.267 37.37±0.74 km |
Synodic rotation period | 10.2684±0.0005 h 10.2705±0.0004 h |
| 0.053±0.002 0.065±0.011 0.0672±0.0150 0.10 (assumed) | |
| Tholen = CU · CU B–V = 0.682 U–B = 0.316 | |
| 10.90±0.12 · 10.95 | |
It was discovered on 9 September 1956, by German astronomer Karl Reinmuth and Dutch astronomer Ingrid van Houten-Groeneveld at Heidelberg Observatory in south-west Germany. It was later named after Dutch astronomer Jan Oort.
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