2003 SD220
Discovered on September 29 2003 by LONEOS, Anderson Mesa. Included in the list of the "Potentially Hazardous Asteroids" of the Minor Planet Center.
Orbital and Physical Characteristics
| Epoch | 2018 Apr 27 |
| Mean Anomaly | 28.01270° |
| Argument of Perihelion | 326.93022° |
| Longitude of Ascending Node | 273.91692° |
| Inclination | 8.51490° |
| Eccentricity | 0.2106895 |
| Semimajor Axis | 0.8266953 AU |
| Orbital Period | 0.75 years |
MOID |
0.0188111 AU |
| Orbit type | Aten |
| Absolute Magnitude | 17.2 |
| Diameter | 1600-800 m |
| Rotation period | 285.0 h [1] |
Radar scattering properties
SC/OC |
0.22 [2] |
| Radar albedo | 0.17 [2] |
Close Approach to the Earth
| Date of encounter | 2018 Dec 22 |
| Distance | 0.0189 AU (7.4 lunar distances) |
Observation Schedule
| Date | Window, UT | Receiver |
Transmitter |
Frequency, MHz |
λ, cm |
Ptx, kW |
R, au |
RTT, sec |
SNR/RTT |
|---|---|---|---|---|---|---|---|---|---|
| 2018 Dec 17 | 11:05 - 13:10 | RT-32 (Sv, Zc) | DSS-14 [3] | 8560.0 | 3.5 | 100 - 144 | 0.025 | 25 | 33 |
| 11:05 - 12:38 | RT-32 (Bd) | ||||||||
| 2018 Dec 18 | 11:40 - 13:10 | RT-32 (Sv, Zc) | DSS-14 [3] | 8560.0 | 3.5 | 100 - 144 | 0.023 | 23 | 46 |
| 2018 Dec 20 | 13:00 - 14:40 | RT-32 (Zc) | DSS-14 [3] | 8560.0 | 3.5 | 100 - 144 | 0.020 | 20 | 78 |
| 2018 Dec 22 | 14:35 - 15:05 | RT-32 (Sv) | DSS-14 [3] | 8560.0 | 3.5 | 100 - 144 | 0.019 | 19 | 87 |
Echo power spectrum
Bistatic DSS-14/RT-32 continuous wave echo power spectra of 2003 SD220 obtained at Zelenchukskaya observatory on December 20, 2018 from 13:10 to 13:35 UT and Svetloe observatory on December 22 from 14:40 to 14:50 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
Warner, B.D. et al., 2009
We thank L. A. Benner, S. Naidu, M. Brozovic and the technical staff at Goldstone for the help with the radar observations.