The database presented here is comprised entirely of observations made utilizing conventional photoelectric photometers and narrowband filters isolating 5 emission species (OH, NH, CN, C3 and C2) and continua. This work was initiated by A'Hearn and Millis in 1976 and includes 2020 observations of 85 comets obtained over 429 nights through the end of 1992. The total number of observations, however, is not evenly distributed over the 85 comets. The median number of observations for a comet is 6, with only a single observation obtained for 14 comets while there were 820 observations of P/Halley. The majority of observations were obtained at either Lowell Observatory or Perth Observatory, however four other observatories were used including an extensive campaign on comet P/Halley from the Cerro Tololo Interamerican Observatory (CTIO). In this archive, results for a subset of 68 comets are presented while the results for P/Halley from this study are archived in the IHW archive.

20 Oct 2008, A.C.Raugh AddedThis dataset presents several data tables from A'Hearn et al. (1995) [AHEARNETAL1995], which contain a comparative analysis of Haser model production for the observations included in the Lowell Observatory Cometary Database (LOCD). In addition, similar data for two more comets, West (1975 A1-A) and Kohoutek (1973 E1), are included.

20 Oct 2008, A.C.Raugh AddedThis dataset presents several data tables from A'Hearn et al. (1995) [AHEARNETAL1995], which contain a comparative analysis of Haser model production for the observations included in the Lowell Observatory Cometary Database (LOCD). In addition, similar data for two more comets, West (1975 A1-A) and Kohoutek (1973 E1), are included.

The INFRARED PHOTOMETRY Network contains 2204 observations of Comet Halley spanning dates from 1984 Sep 14 through 1988 Apr 08.

The INFRARED PHOTOMETRY Network contains 2204 observations of Comet Halley spanning dates from 1984 Sep 14 through 1988 Apr 08.

This dataset presents a collection of 2334 published and 319 unpublished results in cometary polarimetry. The database contains 2653 measurements of linear and circular polarization for 65 comets since 1940. The narrow-band and broad-band measurements within the spectral region 0.3-3.5 micron are presented. The ranges of phase angles, helio- and geocentric distances of comets are 0.4-122 deg, 0.6-4.8 AU and 0.03-4.9 AU, respectively. We have compiled 64 references to the published papers and some unpublished sources. The data are presented in a tabular format (ASCII code). The database can be used as the observational basis for detailed theoretical modeling, interpretation of the phase-angle and spectral dependence of polarization, classification of comets, and for selecting future space-mission targets.

This dataset presents a collection of 2334 published and 319 unpublished results in cometary polarimetry. The database contains 2653 measurements of linear and circular polarization for 65 comets since 1940. The narrow-band and broad-band measurements within the spectral region 0.3-3.5 micron are presented. The ranges of phase angles, helio- and geocentric distances of comets are 0.4-122 deg, 0.6-4.8 AU and 0.03-4.9 AU, respectively. We have compiled 64 references to the published papers and some unpublished sources. The data are presented in a tabular format (ASCII code). The database can be used as the observational basis for detailed theoretical modeling, interpretation of the phase-angle and spectral dependence of polarization, classification of comets, and for selecting future space-mission targets.

The McDonald Observatory Faint Comet Survey data set presents spectral data from 152 observations of 17 comets taken using the Intensified Dissector Scanner spectrograph.

The McDonald Observatory Faint Comet Survey data set presents spectral data from 152 observations of 17 comets taken using the Intensified Dissector Scanner spectrograph.

The NEAR NUCLEUS STUDIES Network contains 2204 observations of Comet Halley spanning dates from 11982 Oct 16 through 1989 Apr 12.