Analys av HCN-emission från kometen C/2013 R1 (Lovejoy)
Abstract: In this report, results from the observations of comet C/2013 R1 (Lovejoy) carried out with the 20 metertelescope at Onsala Space Observatory during the autumn of 2013 are presented. The project comprisesthe analysis of data from the observation dates when emission from the rotational transition J = 1 0for the molecule hydrogen cyanide (HCN) were observed. Detections have been made for seven differentdates when C/2013 R1 (Lovejoy) were at a distance of 0.94-0.82AU from the sun, just before perihelion.The production rate increases from 31026 s1 to 51026 s1 with the decreasing distance to the sun. One ofthe days has also been divided in mean value formations over shorter time intervals for which a periodicvariation in the production rate can be discerned although not confirmed.To perform calculations and processing of data, two computer programs have been used. The first isxs, a data reduction software for radio astronomical observations, written by Per Bergman at Onsala SpaceObservatory. The second program is mom, developed by Stefanie Milam at NASA Goddard Space FlightCenter.iv
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