Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999msngr..95...18w&link_type=abstract
Messenger, No. 95, p. 18 - 19, 22 - 24
Other
1
Data Processing: Efficiency
Scientific paper
A number of articles have recently appeared in the ESO Messenger reporting on the past experience of the NTT service observing programme in Periods 58, 59 and 60 (Silva and Quinn 1997, Silva 1998). In this paper, the third in this series, we report on the results of a statistical analysis of the efficiency of service observing during Period 60. We have compared service observing (SO) with the classical ‘Visitor' Mode (VIS), and with the other main programme executed at the NTT during this period, the ESO Imaging Survey (EIS). To obtain an insight into the efficiency of service observing, we examined the Period 60 NTT observing logs in detail. We have only compared nighttime operations, and do not include pre-observing preparations into our analysis. The observations in Service Mode suffered significantly more from adverse weather conditions at La Silla than both the VIS and EIS observations. On average, the down time during Service Mode (both weather and technical down time) is more than double the down time during either the VIS and EIS Mode, 23.7% versus 10.9% and 10.4% respectively. Irrespective of these adverse weather conditions during Service Mode, it can be maintained that service observing is an efficient way of managing telescope time.
Silva Danilo
Woudt Patrick A.
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