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FebStds.txt

Marc Mengel, 08/26/2013 12:01 PM

 
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Table of standard stars to take during normal evening twilight time (i.e., starting about 45 min before Astronomical Twilight)
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and just before middle-of-the-night switchover (about 20 min before switchover).
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If Evening Twilight or Pre-Switchover standard star fields are not taken at the normal times, then it is recommended to 
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use the StdStarPicker code on observer2 to choose the fields.
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The Evening Twilight fields are listed in order of the high-airmass field (hi), the low-airmass field (lo), and the 
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medium-airmass field (med).
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During Evening Twilight, it is probably best to take the high-airmass field first, followed by the low and medium airmass fields
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(i.e., in the order listed).
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For Pre-Switchover, a field was chosen which seemed to best complement the fields suggested for Evening Twilight.
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Generally, a high-airmass field was chosen, but sometimes a low-airmass field is chosen (or at least chosen as an
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alternate).  
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Date   |            Eve. Twi (hi,lo,med)                 |   Pre-Switchover                 |  Comments                            |
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Jan 29 | SDSSJ0100,SDSSJ0320,SDSSJ0200                   | E2-A (hi)                        |                                      |
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Jan 30 | SDSSJ0100,SDSSJ0320,SDSSJ0200                   | E2-A (hi)                        |                                      |
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Jan 31 | SDSSJ0100,SDSSJ0320,SDSSJ0200                   | E2-A (hi)                        |                                      |
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Feb  1 | SDSSJ0100,SDSSJ0320,SDSSJ0200                   | E2-A (hi) (alternate: E4-A (lo)) |                                      |
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Feb  2 | SDSSJ0100,SDSSJ0320,SDSSJ0200                   | E2-A (hi) (alternate: E4-A (lo)) |                                      |
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Feb  3 | SDSSJ0100,SDSSJ0320,SDSSJ0200                   | E2-A (hi) (alternate: E4-A (lo)) |                                      |
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Feb  4 | SDSSJ0100(alternate: E4-A),SDSSJ0320,SDSSJ0200  | E2-A (hi) (alternate: E4-A (lo)) | E4-A is alt. if 0100 has set too far |
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Feb  5 | SDSSJ0100(alternate: E4-A),SDSSJ0320,SDSSJ0200  | E2-A (hi) (alternate: E4-A (lo)) |                                      |
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Feb  6 | SDSSJ0100(alternate: E4-A),SDSSJ0320,SDSSJ0200  | E2-A (hi) (alternate: E4-A (lo)) |                                      |
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Feb  7 | E4-A,SDSSJ0320,SDSSJ0200                        | E2-A (hi) (alternate: E4-A (lo)) |                                      |
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Feb  8 | E4-A,SDSSJ0320,SDSSJ0200                        | E4-A (lo) (alternate: E2-A (hi)) | Note pre-switchover field switch     |
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       |                                                 |                                  |                                      |
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Feb 17 | SDSSJ0200,E2-A,SDSSJ0320                        | E6-A (hi)                        |                                      |
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Feb 18 | SDSSJ0200,E2-A,SDSSJ0320                        | E6-A (hi)                        |                                      |
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Feb 19 | SDSSJ0200,E2-A,SDSSJ0320                        | E6-A (hi)                        |                                      |
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Feb 20 | SDSSJ0200,E3-A(alternate: E2-A),SDSSJ0320       | E6-A (hi)                        | Note switch from E2-A to E3-A        |
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Feb 21 | SDSSJ0200,E3-A(alternate: E2-A),SDSSJ0320       | E6-A (hi)                        |                                      |
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Feb 22 | SDSSJ0200,E3-A(alternate: E2-A),SDSSJ0320       | E6-A (hi)                        |                                      |
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