C40/RetroCam Exposure Times

Date of latest modification: Apr 15 2010, 13:00 Chilean time (Francisco).

Supernovae (sorted by RA)

Number of dither sequences X Exposure Time (s) X Loops - Dither Macro

Name Yc
 sec   -  macro		 Jo
 sec   -  macro		 Hc
 sec   -  macro		 Dither
Step		 RA                 DEC
2000.0		 Initial offsets(*)
dx           dy		 Beam
Switch(*)		 Priority
(1 is highest)

Old Calibrations (sorted by RA) ONLY IF PHOTOMETRIC AND STANDARDS TAKEN

Number of dither sequences X Exposure Time (s) X Loops - Dither Macro

Name Yc
 sec   -  macro		 Jo
 sec   -  macro		 Hc
 sec   -  macro		 Dither
Step		 RA                DEC
2000.0		 Initial offsets(*)
dx          dy		 Beam
Switch(*)		 Priority
(1 is highest)
SN 2008hh 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 01 26 03.65 +11 26 26.50 90'' E 90'' S 180'' N-S 2
SN 2007il 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 01:27:09.75 +14:46:46.50 90'' E 90'' S 180'' N-S 2
SN 2008gi 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 02:44:00.33 +05:25:42.80 90'' E 90'' S 180'' N-S 1
SN 2008F 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 02:54:55.11 -06:21:56.70 90'' E 90'' S 180'' N-S 1
SN 2008J 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 02 34 24.20 -10 50 38.50 90'' E 90'' S 180'' N-S 1
SN 2007jd 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 02:59:53.37 +01:09:38.60 90'' E 90'' S 180'' N-S 1
SN 2007jh 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 03:36:01.54 +01:06:12.20 90'' E 90'' S 180'' N-S 3
SN 2009cz 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 09 15 00.02 +29 44 07.10 90'' E 90'' S 180'' N-S 3
SN 2006lu 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 09 15 17.63 -25 36 00.30 90'' E 90'' S 180'' N-S 3
SN 2009dq 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 10 08 49.94 -67 01 57.30 90'' E 90'' S 180'' N-S 2
SN 2009ds 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 11:49:04.11 -09:43:44.90 90'' E 90'' S 180'' N-S 1
SN 2008in 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 12 22 01.77 +04 28 47.50 90'' E 90'' S 180'' N-S 1
SN 2009dp 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 20 26 52.69 -18 37 04.20 90'' E 90'' S 180'' N-S 2
SN 2006it 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 20:43:51.38 +12:30:30.90 90'' E 90'' S 180'' N-S 2
SN 2007hm 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 20:57:55.47 -07:23:24.10 90'' E 90'' S 180'' N-S 2
SN 2009ca 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 21:26:22.20 -40:51:48.60 90'' E 90'' S 180'' N-S 2
SN 2009dt 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 22:10:09.27 -36:05:42.60 90'' E 90'' S 180'' N-S 1
SN 2008go 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 22:10:44.83 -20:47:17.20 90'' E 90'' S 180'' N-S 1
SN 2006iw 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 23:21:19.47 +00:15:35.50 90'' E 90'' S 180'' N-S 3
SN 2005es 2x60x1 - rot-9 2x60x1 - rot-9 2x30x2 - rot-9 15'' 23:25:47.62 +08:02:17.30 90'' E 90'' S 180'' N-S 3

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).