Near-Earth-Asteroid Radar at Goldstone, Aug 1996 - Jun 1998

Astronomy and Astrophysics – Astronomy

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Scientific paper

We obtained echoes from nine NEAs during this period. The following table presents some of our astrometric results. Each entry gives the time delay or Doppler frequency for echoes from the target's center of mass, received at the specified UTC epoch. Stated errors incorporate uncertainties in target dimensions. Observations used 8510-MHz transmissions from DSS-14 and reception at DSS-14 or DSS-13, as indicated. Each antenna's reference point is the intersection of the elevation and azimuthal axes. Here 1 us corresponds to 150 m in range and 1 Hz corresponds to 1.76 cm/s in radial velocity. \vskip 1ex
UTC Epoch Target yyyy/mm/dd hh:mm:ss Type Measurement\quad \= +/- RCV 7822 (1991CS) \>1996/08/26 \>14:10:00 \>DOP \>491117.6 Hz\> 0.5 Hz \> 14 4197 (1982TA) \>1996/10/23 \>07:10:00 \>DOP \>488339 Hz\> 5 Hz \> 14 4197 (1982TA) \>1996/10/23 \>11:10:00 \>DEL \>89.601609 s \> 13 us \> 14 4197 (1982TA) \>1996/10/24 \>06:50:00 \>DEL \>86.425022 s \> 13 us \> 14 4197 (1982TA) \>1996/10/28 \>17:00:00 \>DEL \>94.450116 s \> 13 us \> 14 4179 Toutatis \>1996/11/26 \>18:00:00 \>DEL \>40.12841509 s \> 0.3 us \> 13 4179 Toutatis \>1996/12/01 \>13:20:00 \>DEL \>36.57292418 s \> 0.3 us \> 13 7341 (1991VK) \>1997/01/10 \>18:20:00 \>DOP \>3731.0 Hz\> 5 Hz \> 14 7341 (1991VK) \>1997/01/11 \>19:10:00 \>DEL \>75.008124 s \> 5 us \> 14 7482 (1994PC1) \>1997/01/20 \>05:10:00 \>DEL \>65.524897 s \> 4 us \> 14 7482 (1994PC1) \>1997/01/23 \>04:50:00 \>DEL \>69.2846055 s \> 10 us \> 13 1997BR \>1997/07/01 \>20:40:00 \>DOP \>375473.1 Hz\> 0.5 Hz \> 14 1998BY7 \>1998/02/21 \>05:30:00 \>DOP \>-25905 Hz\> 10 Hz \> 14 6037 (1988EG) \>1998/02/27 \>01:30:00 \>DEL \>35.7262935 s \> 2.0 us \> 14 6037 (1988EG) \>1998/03/03 \>05:30:00 \>DOP \>-485452.20 Hz\> 0.2 Hz \> 14 6037 (1988EG) \>1998/03/04 \>05:10:00 \>DEL \>43.2599250 s \> 2.0 us \> 14 1998KY26 \>1998/06/06 \>03:40:00 \>DOP \>201145.6 Hz\> 3.0 Hz \> 13 1998KY26 \>1998/06/07 \>14:00:00 \>DEL \>5.61737824 s \> 0.2 us \> 13 1998KY26 \>1998/06/08 \>12:30:00 \>DEL \>5.3867641 s \> 10.0 us \> 13 1998KY26 \>1998/06/08 \>12:30:00 \>DOP \>-37379.439 Hz\> 3.0 Hz \> 13 }

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