Table 1 Forward-scatter radar cross sections σ of Vesta’s surface measured at each echo site from high-incidence BSR surface reflections
From: Orbital bistatic radar observations of asteroid Vesta by the Dawn mission
Orbit no. | Occultation date & stage | Time at receiver HH:MM:SS (UTC) | Surface echo location (Lat., Lon.) | Terrain31 | a σ (km2) | b σ/σ max (dB) |
|---|---|---|---|---|---|---|
355 | 24 DEC 2011 Entry | 3:47:09 | (25°S, 13°E) | Rheasilvia smooth terrain (rst) | 1361 ± 19 | –4.2 ± 0.2 |
355 | 24 DEC 2011 Exit | 4:20:19 | (43°N, 115°E) | Northern cratered trough terrain (nctt) | 823 ± 16 | –6.4 ± 0.3 |
377 | 28 DEC 2011 Exit | 5:26:29 | (46°N, 173°E) | nctt | 262 ± 15 | –11.4 ± 0.3 |
406 | 02 JAN 2012 Exit | 13:11:48 | (40°N, 149°E) | nctt | 3588 ± 200 | 0(reference valueb for the site with maximum surface echo strength) |
407 | 02 JAN 2012 Entry | 17:06:36 | (26°S, 346°E) | rst | 1124 ± 17 | –5.0 ± 0.3 |
407 | 02 JAN 2012 Exit | 17:38:17 | (39°N, 87°E) | Dark material near Arruntia crater | 280 ± 12 | –11.1 ± 0.3 |
521 | 23 JAN 2012 Exit | 16:21:05 | (38°N, 104°E) | nctt | 1539 ± 27 | –3.7 ± 0.3 |
597 | 06 FEB 2012 Exit | 15:10:12 | (29°N, 328°E) | Lavinium Dorsum | 156 ± 13 | –13.6 ± 0.4 |
644 | 15 FEB 2012 Entry | 6:10:47 | (7°S, 204°E) | Marcia crater ejecta | 782 ± 21 | –6.6 ± 0.3 |
644 | 15 FEB 2012 Exit | 6:27:29 | (29°N, 247°E) | Saturnalia Fossae | 84 ± 8 | –16.3 ± 0.5 |
719 | 29 FEB 2012 Entry | 0:39:44 | (0°N, 148°E) | Octavia crater | 971 ± 87 | –5.7 ± 0.5 |
719 | 29 FEB 2012 Exit | 0:45:13 | (13°N, 156°E) | Cratered highlands near Aricia Tholus | 2369 ± 115 | –1.8 ± 0.3 |
720 | 29 FEB 2012 Entry | 4:59:51 | (7°S, 86°E) | Divalia Fossae | 3012 ± 43 | –0.8 ± 0.2 |
720 | 29 FEB 2012 Exit | 5:10:37 | (13°N, 118°E) | Cratered highlands | 2080 ± 42 | –2.4 ± 0.3 |
