Derived, calibrated density profiles from the NMS ION and NEUTRAL sensors flown on the GIOTTO mission and obtained during the comet Halley fly-by on 13 March 1986. This data set corrects issues found in the GIO-C-NMS-4-86P-V1.0 data set.

In preparation for the concerted international study of Comet Halley, the IHW conducted a trial run with observations of Comet Crommelin, largely during February and March of 1984.

NASA's International Halley Watch (IHW) has created a Comet Halley Archive. The collection of data spans the full wavelength range as submitted by scientists to the IHW. The observations belong to one of the following Disciplines: Amateur, Astrometry, Infrared Studies, Large-Scale Phenomena, Meteor Studies, Near-Nucleus Studies, Photometry and Polarimetry, Radio Studies, and Spectroscopy and Spectrophotometry. The data collected by these nine disciplines were augmented by Spacecraft measurements. The data were submitted to IHW, but the evaluation and selection for the Archive has been the primary responsibility of the Discipline Specialist Teams for each network in cooperation with the Lead Center. The visual data for Eta Aquarid contains 579 observations, spanning dates 1984 April 27 through 1987 May 11.

In preparation for the concerted international study of Comet Halley, the IHW conducted a trial run with observations of Comet Crommelin, largely during February and March of 1984.

In preparation for the concerted international study of Comet Halley, the IHW conducted a trial run with observations of Comet Crommelin, largely during February and March of 1984.

In preparation for the concerted international study of Comet Halley, the IHW conducted a trial run with observations of Comet Crommelin, largely during February and March of 1984.

The IKS data from Vega-1 came in various forms. The initial submission from IKI by Dyachkov was in GROUP FITS (binary) for the 'imaging channel'. A separate submission came through the IHW Infrared Studies Discipline and also contained data presented in the FITS format (IHW keywords) for the two 'infrared channels'. In the former case, the three Pvalues carried information on the distance and two angles used to locate the position of the comet on the slit. The other simple keyword values marked only the date, mission, and experiment. The latter data, had not only 101 individual spectra for the 3-5 micron measurements but a composite 'final' 6-12 micron spectrum with associated 'figure 7' from the published results (COMBES, M. et al. 1988, Icarus, 76, 404). For these 101 spectra a cometo-centric distance was quoted rather than a time micron data. Using this information, the distance range was 270534.9 to 39273.22 km. From this comparison, it is inferred that the distance quoted in the IKI submission is also cometo-centric (31596.0 to 16092 km)

NASA's International Halley Watch (IHW) has created a Comet Halley Archive. The collection of data spans the full wavelength range as submitted by scientists to the IHW. The observations belong to one of the following Disciplines: Amateur, Astrometry, Infrared Studies, Large-Scale Phenomena, Meteor Studies, Near-Nucleus Studies, Photometry and Polarimetry, Radio Studies, and Spectroscopy and Spectrophotometry. The data collected by these nine disciplines were augmented by Spacecraft measurements. The data were submitted to IHW, but the evaluation and selection for the Archive has been the primary responsibility of the Discipline Specialist Teams for each network in cooperation with the Lead Center. The Amateur Observation Network archived 11641 measurements of Halley's comet. Even though most observers adhered to guidelines established by the IHW, visual magnitudes are highly subjective depending on the technique of each observer and may vary with the quality of the instrument used (e.g., binoculars vs. telescope). These magnitude estimates cover the date range from 1985 January 23 through 1988 February 23.

In preparation for the concerted international study of Comet Halley, the IHW conducted a trial run with observations of Comet Crommelin, largely during February and March of 1984.

NASA's International Halley Watch (IHW) has created a Comet Halley Archive. The collection of data spans the full wavelength range as submitted by scientists to the IHW. The observations belong to one of the following Disciplines: Amateur, Astrometry, Infrared Studies, Large-Scale Phenomena, Meteor Studies, Near-Nucleus Studies, Photometry and Polarimetry, Radio Studies, and Spectroscopy and Spectrophotometry. The data collected by these nine disciplines were augmented by Spacecraft measurements. The data were submitted to IHW, but the evaluation and selection for the Archive has been the primary responsibility of the Discipline Specialist Teams for each network in cooperation with the Lead Center. The data from the Large-Scale Phenomena Network has been organized into a set of digitized images and those left in the original analog state for reasons of quality, time coverage, or submission problems. These latter 1771 pieces of data are held in an archive both at Goddard Space Flight Center and with the Small Bodies Node of the Planetary Data System. (In the latter case, contact specifically the Comet Sub-Node of the PDS at the Laboratory for Atmospheric and Space Physics associated with the University of Colorado Boulder, for more assistance). Some of these analog images are presented in 'The International Halley Watch Atlas of Large-Scale Phenomena' (Brandt, John C., Niedner, Malcolm B. Jr., Rahe, Jurgen, 1992). The data cover a time range from 1984 December 22 through 1987 April 26 through 23 of the IHW Chronological Data Archive Collection