Data Set Information
DATA_SET_NAME SAWYER ASTEROID SPECTRA V1.1
DATA_SET_ID EAR-A-3-RDR-SAWYER-ASTEROID-SPECTRA-V1.1
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION
Data Set Overview : This data set contains 94 asteroid spectra obtained by Scott Sawyer as part of his Ph.D. dissertation at the University of Texas at Austin.   Parameters : Each spectrum is contained in a separate file, listing wavelength and reflectance. The index file for this collection contains observation dates, visual magnitude, integration time, phase angle, solar elongation, geo- and heliocentric distances, airmass, wavelength coverage limits, normalization wavelength and solar analog stars for each spectrum included.   Processing : The details of the data processing are reported in Sawyer (1991) [SAWYER1991].  The spectra as shown in the figures of Sawyer (1991) have had the noisy red and blue ends trimmed, and sections affected by telluric H2O and O2 bands edited out. The versions of the spectra in this archive have not had noisy ends and telluric bands edited out. Comparison of these spectra with the figures in Sawyer (1991) will show which sections were edited out for publication.  The spectra in Sawyer (1991) have been normalized to 1.0 at 0.57 microns if the spectrum covers that wavelength. Bluer spectra are normalized at 0.45 microns, and redder spectra are normalized at 0.80 microns. Several spectra in this archive do not follow this pattern and the information is lacking to determine what normalization and shifting have been applied to them. For these spectra, the normalization wavelength is given as '9.99' in the index file.   Modification History : This data set first entered the PDS archives following its successful external peer review on 23 March 1998.  This data set was re-examined as part of a general review of holdings. At that time several upgrades and modification were made. These included:  o Specific target names were inserted into all labels.  o The observational parameters in the 'sawindex.tab' file were incorporated into the top-level description field of the corresponding label.  o The date of observations from 'sawindex.tab' was inserted into both the START_TIME and STOP_TIME fields of the corresponding label.  o Data files were renamed to indicate the asteroid number and name, with a sequence number only when multiple spectra of a single object are present in this collection.  o It was determined that no spectrum file contained any actual error values. The REFLECTANCE_ERROR column, formerly present but filled with a flag value, was thus deleted from all spectrum files and labels.  o Two files, '512herculina.tab' (formerly 'herculi1.tab') and '5astraea1.tab' (formerly 'astrae1.tab') contained apparently spurious data lines at the end of the spectrum. The reflectance values in these lines were printed in a different format from the rest of the file, and the values were 2-3 orders of magnitude smaller than the immediately preceding spectral point. These lines have been deleted (2 lines from '512herculina.tab' and 5 lines from '5astraea1.tab').  o The INSTRUMENT_HOST_NAME and INSTRUMENT_NAME fields, previously marked 'N/A', have been filled with appropriate values. In keeping with Small Bodies Node conventions for ground-based spectra, the instrument host is considered to be the telescope used; the instrument is the detector. Catalog objects have been supplied for the two hosts and two instruments newly defined.  o The 'sawindex.*' files were modified to reflect the new file names.  o This catalog file was updated to include a complete list of specific targets and to document the other changes.
DATA_SET_RELEASE_DATE 1998-03-23T00:00:00.000Z
START_TIME 1983-09-15T12:00:00.000Z
STOP_TIME 1990-07-14T12:00:00.000Z
MISSION_NAME SUPPORT ARCHIVES
MISSION_START_DATE 2004-03-22T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME 10 HYGIEA
107 CAMILLA
111 ATE
1167 DUBIAGO
1172 ANEAS
1268 LIBYA
127 JOHANNA
128 NEMESIS
13 EGERIA
130 ELEKTRA
137 MELIBOEA
14 IRENE
148 GALLIA
171 OPHELIA
173 INO
19 FORTUNA
190 ISMENE
194 PROKNE
2 PALLAS
20 MASSALIA
203 POMPEJA
212 MEDEA
230 ATHAMANTIS
241 GERMANIA
27 EUTERPE
30 URANIA
329 SVEA
34 CIRCE
386 SIEGENA
387 AQUITANIA
405 THIA
409 ASPASIA
41 DAPHNE
410 CHLORIS
419 AURELIA
431 NEPHELE
434 HUNGARIA
44 NYSA
45 EUGENIA
476 HEDWIG
48 DORIS
5 ASTRAEA
505 CAVA
51 NEMAUSA
511 DAVIDA
52 EUROPA
532 HERCULINA
537 PAULY
54 ALEXANDRA
57 MNEMOSYNE
602 MARIANNA
617 PATROCLUS
63 AUSONIA
64 ANGELINA
65 CYBELE
70 PANOPAEA
702 ALAUDA
704 INTERAMNIA
712 BOLIVIANA
72 FERONIA
804 HISPANIA
85 IO
87 SYLVIA
9 METIS
91 AEGINA
93 MINERVA
95 ARETHUSA
98 IANTHE
ASTEROID
TARGET_TYPE ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
ASTEROID
INSTRUMENT_HOST_ID MCD21
MCD27
INSTRUMENT_NAME CASSEGRAIN SPECTROMETER
LARGE CASSEGRAIN SPECTROMETER
INSTRUMENT_ID ES2
LCS
INSTRUMENT_TYPE SPECTROMETER
SPECTROMETER
NODE_NAME Small Bodies
ARCHIVE_STATUS SUPERSEDED
CONFIDENCE_LEVEL_NOTE
Review : The data set underwent external peer review on March 23, 1998.   Limitations :  This data set is incomplete, in that only 94 of the 164 spectra reported in Sawyer's thesis are included. The spectra included so far were obtained by PDS from Faith Vilas, with the permission of Scott Sawyer. PDS is currently attempting to locate a provider for the remaining spectra. If they are obtained, they will be added in an update of the data set.
CITATION_DESCRIPTION TBD
ABSTRACT_TEXT Partial spectral data for the plots presented in S. Sawyer's PhD Thesis, 'A High Resolution Spectroscopic Survey of Low Albedo Main Belt Asteroids', 1991.
PRODUCER_FULL_NAME CAROL NEESE
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