Data Set Information
|
| DATA_SET_NAME |
GEOGRAPHOS RADAR V1.0
|
| DATA_SET_ID |
EAR-A-GST-3-RDR-GEOGRAPHOS-RADAR-V1.0
|
| NSSDC_DATA_SET_ID |
|
| DATA_SET_TERSE_DESCRIPTION |
|
| DATA_SET_DESCRIPTION |
Data Set Overview : Goldstone radar observations of 1620 Geographos from August 28 through Sept. 2, 1994 yield delay-Doppler images whose linear spatial resolutions range from ~75 to ~151 meters, and 138 pairs of dual-polarization (OC/SC) (opposite circular/same circular) spectra with one-dimensional resolution of 103 m. These data are presented in Ostro, et al. 1996, Icarus 121, 46 [OSTROETAL1996], and are included in this data set. A full description of the observations and the reduction process is provided in the paper. Data : Individual images from each successful radar run are in FITS files 'ge[Nxx].fit' where N is the last digit of DOY (day of year) and xx is the run number within that day. The low-resolution images are collected in a collage image 'gelrmov.fit', and the high-resolution images in a collage image 'gehrmov.fit'. Multi-run sums of co-registered images from 30 degree blocks of rotational phase, for the low- and high-resolution images respectively, are in files 'gelrsum.fit' and 'gehrsum[N].fit' (N:1,3 for the three high-resolution summed images). The collages and summed images are the same as the data presented in Figures 8-11 of the paper. The scaling of the images is explained in the following excerpt from the paper: 'Data values for each image in this paper are mapped onto a 256-level gray scale. Since the noise background is not interesting, all data values below a clipping level near the noise mean are mapped to black to make the most of the gray scale's available dynamic range. Similarly, all data values above some saturation level are mapped to white, since the contrast at the very highest echo levels contains less interesting information than contrast among the more abundant dimmer pixels.' The levels chosen for clipping and saturation level for each image are recorded in the label description for that image. 138 individual continuous wave (cw) power spectra are collected in the file 'gecwall.tab', and spectra from the bandwidth extrema are in 'gecwext.tab'. These spectra are the same as those presented in Figures 2 and 7 of the paper. Ancillary Data : An index of the data with observational circumstances for each run is given in the file geindex.tab.
|
| DATA_SET_RELEASE_DATE |
1998-03-23T00:00:00.000Z
|
| START_TIME |
1994-08-28T12:00:00.000Z
|
| STOP_TIME |
1994-09-02T12:00:00.000Z
|
| MISSION_NAME |
SUPPORT ARCHIVES
|
| MISSION_START_DATE |
2004-03-22T12:00:00.000Z
|
| MISSION_STOP_DATE |
N/A (ongoing)
|
| TARGET_NAME |
GEOGRAPHOS
|
| TARGET_TYPE |
ASTEROID
|
| INSTRUMENT_HOST_ID |
GDSCC
|
| INSTRUMENT_NAME |
GOLDSTONE DEEP SPACE NETWORK ANTENNA DSS-14
|
| INSTRUMENT_ID |
DSS14
|
| INSTRUMENT_TYPE |
RADAR
|
| NODE_NAME |
Small Bodies
|
| ARCHIVE_STATUS |
SUPERSEDED
|
| CONFIDENCE_LEVEL_NOTE |
Review : This data set underwent external peer review on March 23, 1998.
|
| CITATION_DESCRIPTION |
Citation TBD
|
| ABSTRACT_TEXT |
Goldstone radar observations of 1620 Geographos from August 28 through Sept. 2, 1994 yield delay-Doppler images whose linear spatial resolutions range from ~75 to ~151 meters, and 138 pairs of dual-polarization (OC/SC) (opposite circular/same circular) spectra with one-dimensional resolution of 103 m. These data are presented in Ostro, et al. 1996, Icarus 121, 46 [OSTROETAL1996], and are included in this data set. A full description of the observations and the reduction process is provided in the paper.
|
| PRODUCER_FULL_NAME |
CAROL NEESE
|
| SEARCH/ACCESS DATA |
SBN PSI WEBSITE
|
|
.png)
.png)
