HCN production rates (upper panel) and line velocity offsets (lower panel) as a function of time in comet C/2001 Q4 (NEAT) derived from the AOSA (blue circles), AOSB (red squares), and CTSB (black triangles) spectrometers which include 1-σ uncertainties. The unit of time in the horizontal axis is UT decimal days in May 2004. The time resolution is roughly 6 min with a small overhead from the telescope movement (integration of 3 min at the on-source and off-source positions in the position-switching observing mode with a relative azimuth offset of 05 between both positions using 15 s samples). Filled symbols indicate spectra that were obtained with a system temperature that was more than 1-σ away from the mean system temperature during the adjacent scans. In the upper panel, the solid line shows the best fit to the H2O apparent outgassing rates with a period of 0.8139 days obtained by fitting a sine function with one harmonic (Biver et al. 2009) scaled by the mean QHCN/QH2O during our observations. The dashed lines show linear fits to the data from the three spectrometers using a weighted linear least-squares method.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.