wheel1

Updated on May 31, 2021, 9:31 am

wheel1:

 (id1 = "U") Short identifier for filter in position 1
 (name1 = "U c6001") Full name of filter in position 1
(focus1 = -200.) Focus value for filter 1 \n
(id2 = "B") Short identifier for filter in position 2
(name2 = "B Harris c6002") Full name of filter in position 2
(focus2 = 10.) Focus value for filter 2 \n
(id3 =  "V") Short identifier for filter in position 3
(name3 = "V Harris c6026") Full name of filter in position 3
(focus3 = 30.) Focus value for filter 3 \n
(id4 = "R") Short identifier for filter in position 4
(name4 = "R Harris c6004") Full name of filter in position 4
(focus4 = 0.) Focus value for filter 4 \n
(id5 = "I") Short identifier for filter in position 5
(name5 = "I c6028") Full name of filter in position 5
(focus5 = 0.) Focus value for filter 5 \n
(id6 =  "z") Short identifier for filter in position 6
(name6 = "z SDSS c6020") Full name of filter in position 6
(focus6 = -15.) Focus value for filter 6 \n
(id7 = "M") Short identifier for filter in position 7
(name7 = "M Washington c6007") Full name of filter in position 7
(focus7 =  65.) Focus value for filter 7 \n
(id8 = "D51") Short identifier for filter in position 8
(name8 = "DDO 51 c6008") Full name of filter in position 8
(focus8 = -35.) Focus value for filter 8 \n
(id9 = "VR") Short identifier for filter in position 9
(name9 = "VR SuperMacho c6027") Full name of filter in position 9
(focus9 =  30.) Focus value for filter 9 \n
(id10 = "o3") Short identifier for filter in position 10
(name10 = "o3 OIII c6014") Full name of filter in position 10
(focus10 =  130.) Focus value for filter 10 \n
(id11 = "g") Short identifier for filter in position 11
(name11 = "g SDSS c6017") Full name of filter in position 11
(focus11 = 30.) Focus value for filter 11 \n
(id12 = "r") Short identifier for filter in position 12
(name12 =  "r SDSS c6018") Full name of filter in position 12
(focus12 = 120.) Focus value for filter 12 \n
(id13 = "i") Short identifier for filter in position 13
(name13 =  "i SDSS c6019") Full name of filter in position 13
(focus13 = -20.) Focus value for filter 13 \n
(id14 = "u") Short identifier for filter in position 14
(name14 = "u SDSS c6021") Full name of filter in position 14
(focus14 = 230.) Focus value for filter 14 \n
(first_pos =  1.) First Filter positions in wheel (read only)
(last_pos = 14.) Last Filter positions in wheel (read only)
(mode = "ql")  

The wheel1 parameter file contains all of the information about the filters: their short identifiers (the name you type when requesting that Arcon use a certain filter, and the name that appears on the GUI), their full names, and their focus offsets with respect to the R filter. The focus offset is applied automatically when taking an exposure; Arcon assumes that the base focus value that appears in instrpars (see above and the section on the focus procedure) corresponds to the R filter. Normally, you should not need to change anything in the wheel1 parameter file; we recommend, however, that you check to make sure that the focus offsets are set to the measured values listed on the filter page.