Data Set Information
DATA_SET_NAME GIOTTO HALLEY MULTICOLOR CAMERA IMAGES V1.0
DATA_SET_ID GIO-C-HMC-3-RDR-HALLEY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview: In total 2304 images were returned on encounter night between 20:54 and 00:03 UT. Of these images, a total of 2017 are present in the data set submitted to IHW. Images taken in 'photometer' mode have not been submitted. These data were obtained by using the spin of the spacecraft to scan the sky while the CCD remained unclocked. They therefore have one dimensional spatial information but each pixel contains the integrated intensity from some portion (depending upon the exposure time) of an annulus on the sky. These data would be useful for this purpose (particularly when taken through the narrow-band filters because of the significantly higher exposure time) were it not for the stray light entering the optics of the camera when HMC was on the sunward side of the spacecraft. No effort has been made to reduce this data and its scientific usefulness is assumed to be negligible. The last three image sets returned in multi-detector mode (MDM) immediately prior to the power disturbance which terminated operations before closest approach are also excluded. Image set 3504 does contain useful data but is corrupted and requires manual reduction. This task has not been completed at this time. Image sets 3505 and 3506 are also corrupted and probably do not contain useful image data. Seven images taken at the beginning of the encounter sequence (image ids 674 to 680) were not correctly converted by the telemetry conversion routine. These images are not currently in the HMC database system and are therefore not included in the IHW data set. The similarity between these data and the subsequent data probably ensures that, for scientific evaluation of HMC data, their omission is of little or no importance. One image (3142) has been omitted because it does not have an associated header. Available data The total numbers of images taken in each superpixel format (SPF) in the IHW data set are shown in Table I together with the size of each superpixel and the size of the output image in superpixels. For the encounter night data set, images taken in SPFs 2, 3, 4, and 5 showed the complete CCD at all times. SPF 1 images were only used in MDM and provided a 37 x 37 superpixel image. In SPF 0, the image format varied as shown in Table II. Red, blue and clear fixed filters covered detectors B, D, and E respectively. Detector C was exposed through a filter wheel with 11 filters and polarizers. The total numbers of images taken through each filter are shown in Table III together with the effective wavelengths and bandwidths of the configurations for single detector mode (from Thomas and Keller, 1989). Table I:| Superpixel | Superpixel size in | Number of available | Image size in || format | original pixels | images | superpixels |-------------------------------------------------------------------------| 0 | 1 x 1 | 882 | see Table II || 1 | 2 x 2 | 204 | 37 x 37 || 2 | 4 x 4 | 38 | 98 x 73 || 3 | 8 x 8 | 171 | 49 x 36 || 4 | 16 x 16 | 394 | 25 x 18 || 5 | 4 x 3 | 328 | 98 x 97 |: Table II:| Image format in SPF 0 | Number of images |--------------------------------------------| 74 x 74 | 68 || 392 x 292 | 131 || 368 x 26 | 210 || 34 x 276 | 209 || 36 x 36 | 132 || 98 x 98 | 93 || 196 x 196 | 39 |: Table III:| Filter | Number of | Effective | Effective | Multiplication || | images | wavelength | bandwidth | factor for FITS || | | [nm] | [nm] | conversion |-----------------------------------------------------------------| clear | 893 | 652.9 | 372.6 | 10 || red | 177 | 813.0 | 165.0 | 10 || orange | 109 | 645.4 | 94.0 | 10 || blue | 175 | 440.0 | 101.1 | 10 || cont.1 | 172 | 457.4 | 20.30 | 100 || cont.2 | 174 | 738.1 | 37.42 | 100 || p- | 42 | - | - | 10 || pII | 43 | - | - | 10 || oh | 83 | 314.8 | 12.25 | 100 || c-2 | 74 | 408.4 | 16.63 | 100 || c-3 | 75 | 509.5 | 20.90 | 100 |:
DATA_SET_RELEASE_DATE 3000-01-01T00:00:00.000Z
START_TIME 1986-03-13T08:54:34.000Z
STOP_TIME 1986-03-14T12:02:35.000Z
MISSION_NAME GIOTTO
MISSION_START_DATE 1985-07-02T12:00:00.000Z
MISSION_STOP_DATE 1992-07-10T12:00:00.000Z
TARGET_NAME HALLEY
TARGET_TYPE COMET
INSTRUMENT_HOST_ID GIO
INSTRUMENT_NAME HALLEY MULTICOLOUR CAMERA
INSTRUMENT_ID HMC
INSTRUMENT_TYPE CAMERA
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : N/A
CITATION_DESCRIPTION Keller, H. U., N. Thomas, W. Curdt, and G. Schwarz, GIOTTO HALLEY MULTICOLOR CAMERA IMAGES V1.0, GIO-C-HMC-3-RDR-HALLEY-V1.0, NASA Planetary Data System, 1992
ABSTRACT_TEXT In total 2304 images were returned on encounter night between 20:54 and 00:03 UT. Of these images, a total of 2017 are present in the data set submitted to IHW.
PRODUCER_FULL_NAME INTERNATIONAL HALLEY WATCH
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