Date of latest modification: Apr 15 2010, 13:00 Chilean time (Francisco).
Click on the SN names above to get a finding chart.
Alternatively, go to the list of RetroCam finder charts.
Airmass plot of P1 SNe only. Airmass plot of P2 SNe only. Airmass plot of P3 SNe only.
In case none of the SNe above nor the standards can be observed, see if any of these older objects can be taken instead.
(*) Strategy: Go to the SN coordinates. Take a short exposure and use it to center on the SN or galaxy. Then do an Initial offset with dx and dy as indicated in the table (usually dx = 90 and dy = 90 to the SE).
Once a sequence is finished, if you have to repeat using the same filter, then change the pointing with offsets of the amount and direction indicated under Beam Switch. Specific instructions can be found in section 4.1 at the RetroCam observing procedures.
(**) Alternative Strategy: In the case of very extended objects (e.g., host galaxies), the sky sequence should be taken off-target. In these cases, point to the exact RA and DEC given in the table --which are not those of the SN--, do not do any offset, and take the object sequence there. After taking the object in each filter, go to the sky position (please be sure the extended object is not there any more), and take a sky sequence. Repeat this with evey filter. Important: for the sky sequence ALWAYS use Exptime = 30 s, Loop = 1, Dither macro = rot-5.
(***) Four sequences: In cases when four dither sequences are requested for a filter, take two consecutive sequences in the upper-right quadrant, followed by two sequences in the lower-right quadrant. Do a small offset of about 20'' in any direction between the two sequences of each quadrant. This way, each pair of sequences can be easily added together.
If photometric: Observe at least 5 Persson Standards in YJH, at different airmasses (roughly 1.0 < X < 2.5). Specific instructions can be found in section 4.2 at the RetroCam observing procedures.
You may refer to the IR Standard Stars list and plates.
Some photometric nights we'll be doing only standard stars, including the "Red Stars" from Persson et al. (Table 3).