https://www.ta3.sk/caosp/Eedition/FullT … 00-512.pdf
SuperWASP (Wide Angle Search for Planets) uses robotic installations on La Palma (Canary Islands, Spain) and at Sutherland (South Africa) to survey the sky for transiting exoplanets. At each site, there is an instrument consisting of eight 200 mm camera lenses (0.11 m aperture) backed with Andor e2v CCDs, arranged on a single equatorial fork mount.
2.2. Observing strategy
The observing strategy employed by both instruments has typically been to observe around a dozen fields per night across a strip of constant declination, but the galactic plane is avoided for reasons of crowding. Two 30 s exposures are taken at each visit, and the typical cadence is around 10 minutes. Fields are followed for a full season of around five months, and the greatest coverage to date is of the region surrounding the celestial equator, which has been observed by both the northern and southern instruments (see Fig. 1).
2.3. Data processing
Since on a clear night, each camera may generate up to 1000 images, and each image occupies around 5 MB when compressed (8 MB uncompressed), there is around 40 GB of data to transfer for each full night’s observation. There is sufficient bandwidth available at SuperWASP-N to transfer the raw data over the internet, but at WASP-South hard disk drives have replaced data tapes as the means of data transfer; a 1 TB disk is returned to the UK every four to six weeks. Raw data are stored in the WASP archive at Warwick (formerly Leicester), which currently contains around 7.7 × 106 raw images, occupying
some 60 TB.
After standard data calibration methods are applied, aperture photometry is performed on objects fainter than about V = 9.5 and brighter than V = 13 (see Pollacco et al., 2006 for a description of the data reduction pipeline). The processed data is also stored in the archive, where there are 4.3 × 1011 data points on 3.1 × 107 unique objects (as at 2013 September).
WASP coverage map. Average data points per star in the WASP archive (as of 2013 September), as a function of sky position (equatorial coordinates)
Отредактировано Пользователь1 (2018-11-14 20:35:03)
