2011 UW158
Discovered on October 25, 2011 by Pan-STARRS 1, Haleakala. Included in the list of the "Potentially Hazardous Asteroids" of the Minor Planet Center.
Orbital and Physical Characteristics
| Epoch | 2018 Mar 23 |
| Mean Anomaly | 107.60886° |
| Argument of Perihelion | 8.76665° |
| Longitude of Ascending Node | 285.99130° |
| Inclination | 4.57170° |
| Eccentricity | 0.3762211 |
| Semimajor Axis | 1.6206420 AU |
| Orbital Period | 2.06 years |
MOID |
0.0022222 AU |
| Orbit type | Amor |
| Absolute Magnitude | 19.4 |
| Diameter | 320 m |
| Rotation period | 0.61 h [1] |
Close Approach to the Earth
| Date of encounter | 2015 Jul 19 |
| Distance | 0.0164 AU (6.4 lunar distances) |
Observation Schedule
| Date | Window, UT | Receiver |
Transmitter |
Frequency, MHz |
λ, cm |
Ptx, kW |
R, au |
RTT, sec |
SNR/RTT |
|---|---|---|---|---|---|---|---|---|---|
| 18-19 July 2015 г. | 19:25 - 02:30 | RT-32 (Sv, Bd) | DSS-14 [2] | 8560.0 | 3.5 | 400 | 0.0166 | 17 | 7 |
| 19:25 - 23:30 | RT-32 (Zc) |
Echo power spectrum
Bistatic DSS-14/RT-32 continuous wave echo power spectra of 2011 UW158 obtained at Badary and Zelenchukskaya observatories on July 18, 2015 from 20:25 to 21:00 UT. Solid and dashed lines denote echo power in the opposite circular (OC) and same circular (SC) polarizations as that of the transmitted wave.
Remarks
We thank L. A. Benner, S. Naidu, M. Brozovic and the technical staff at Goldstone for the help with the radar observations.