ChaMPlane Observation: CTIO/Hydra June 21-25, 2004

ChaMPlane Observation with CTIO 4m Hydra

June 21-25, 2004

I. Target Fields

There are there target fields for this run. GC2-6 are the optical counter parts of X-ray sources from Wang's survey detected in Mosaic GC2 - GC6. GalPln are the Galactic Plane field. BW is the Baade's Window.

                   Table 1. ChaMPlane CTIO/Hydra Observation Field Lists

Field     RA         Dec(J2000)      l         b       NH(e22)   Exp  Instru  ObsID
-------------------------------------------------------------------------------------------
GC2    17:43:33.12  -29:01:48.0  359.68500   0.33677  1.0900   24.00  ACIS-I  2267 - 2296
GC3    17:45:44.88  -28:25:48.0    0.44816   0.24004  1.0900   24.00  ACIS-I  2267 - 2296
GC4    17:48:27.60  -28:25:48.0    0.75723  -0.26983  1.0900   24.00  ACIS-I  2267 - 2296
GC5    17:43:04.80  -29:37:48.0  359.12038   0.10918  1.0900   24.00  ACIS-I  2267 - 2296
GC6    17:45:49.20  -29:37:48.0  359.43188  -0.39826  1.0900   24.00  ACIS-I  2267 - 2296
BW     18:03:45.70  -29:57:15.0    1.11639  -3.92286  0.2960  100.00  ACIS-I  3780
GalPln 18:43:27.72  -03:58:12.0   28.49164  -0.03855  2.0700  200.00  ACIS-I  949 1523 2298
-------------------------------------------------------------------------------------------

II. Hydra Setup Files

Following table lists the Hydra setup files. For each field, there are bright setup (Mag < 18) and faint setup (Mag => 18). GC1 hydra files are also listed here but we don't observe them in this run, as most of them are already in the IMACS masks. For bright setup, only observe those with more than 10 objects in the hydra file (there are 8 such setup). For faint setup, only observe those with more than 25 objects in the hydra file (there are 7 such setup). The bright setup has higher priority than the faint setup, because it takes less exposure time. With in bright or faint setups, priorities are sorted in the order of number of objects in the setup. For example, do the GC5-bright1 first. After finish the bright setups, do the GC2-faint1 first.


    Table 2. ChaMPlane CTIO/Hydra Observation Hydra files 

        Bright (object Mag < 18)    Faint (object Mag => 18) 			 
        Total  1   2   3   4   5    Total  1   2   3   4   5
--------------------------------------------------------------
GC1       94   37  25  13  7   6     205   78  55  28  12  8
GC2       59   43  13  3             117   65  28  13  7   3
GC3       75   46  18  6   2   1     105   59  28  8   6   2
GC4       44   32  10  2              58   38  15  4   1   
GC5       65   46  16  2   1         124   59  37  17  6   2
GC6       44   31  10  3              32   21  7   1   1   1
BW       106   60  37  7   1   1
GalPln   279   71  60  58  45  23    285   81  76  69  40  14

--------------------------------------------------------------

Total: total number of bright or faint objects in this field.
1:     number of bright or faint objects in the first hydra setup
2:     number of bright or faint objects in the second hydra setup, which is the left over from the first setup.
3:     number of bright or faint objects in the third hydra setup, which is the left over from the second setup.
And so on for 4 and 5.

Click a number to get that hydra file.

III. Exposure Sequence

Take 3x10min exposures for each bright setup and 5x40min exposures for ech faint setup. Following tables list the exposure sequence for each setup, including setup fibers, acquire field and take comparison lamp.

The total time needed for each bright setup is 98.5m = 1hr38.5m. The total time needed for each faint setup is 236.5m = 3hr56.5m.

  Table 3. Exposure sequence for bright hydra setup

Do                     Exp   Readout Total   Timeline
                      (min)    (min) (min)     (min)
-----------------------------------------------------
Setup hydra fiber                       ~20     20.0
Acquire field                            ~5     25.0
Comparison spectrum   ~0.5    2.5         3     28.0
Object spectra        20.0    2.5        22.5   50.5
Object spectra        20.0    2.5        22.5   73.0
Object spectra        20.0    2.5        22.5   95.5
Comparison spectrum   ~0.5    2.5         3     98.5
-----------------------------------------------------


  Table 4. Exposure sequence for faint hydra setup

Do	               Exp   Readout Total   Timeline
                      (min)    (min) (min)     (min)
-----------------------------------------------------
Setup hydra fiber                       ~20     20.0 
Acquire field                            ~5     25.0
Comparison spectrum   ~0.5    2.5	  3     28.0
Object spectra        65.0    2.5        67.5   95.5
Object spectra        65.0    2.5        67.5  163.0
Comparison spectrum   ~0.5    2.5         3    166.0
Object spectra        65.0    2.5        67.5  233.5
Comparison spectrum   ~0.5    2.5         3    236.5
-----------------------------------------------------

IV. Observation Plan

Here is an observing elevation chart showing the locus of (from left to right) GC, SW, BW and GalPl. Horizontal axis is the time in hours. Space between two gray bars are the astronomical twilight zone. Vertical axis is the object zenith distance in degrees.

postscript and txt

Here is an observing almanac made for this run. Here is the CTIO 2004 Ephemeris.

The astronomical twilight on June 21-25, 2004 ends at 7:16pm local time and the duration ranging from 10:57:00 (657min) on June 21 to 10:56:38 (656.6min) on June 25. However, the duration for GC, SW or BW field with airmass < 2 is only about 9.5 hours. Since we need 1hr38.5m for each bright field and 3hr56.5m for each faint field, for a given night in the best possible condition, we can do:

Do                  time need
------------------------------
6 bright setups     9.85 hours
1 faint + 3 bright  8.87 hours
2 faint + 1 bright  9.52 hours
------------------------------

Here is the observing plan for each night. This table will be updated daily.

                  Table 5.  Observing Plan

Night Date                   Done
---------------------------------------------------------------------------------------
  1   6/21  GC5-bright1(1x25m) GC2-bright1(3x25m)  GC2-faint1(1x60m)
  2   6/22  GC3-bright1(3x25) GC4-bright1(25,2x20) GC3-faint1(3x60) GC6-bright1(3x20) GC3-bright2(15)
  3   6/23  GC5-faint1(3x65)  GC4-faint1(3x65)  BW-bright1(4x20)
  4   6/24  Bad weather.  No data.
  5   6/25  GC5-bright2(20,2x25) GP-bright1(3x20) GP-bright2(3x15) GP-bright3(15,2x16.7) GP-bright4(15,2x21.7) BW-bright2(20,30,25)
---------------------------------------------------------------------------------------

V. Flux Standard

Take flux standards before dawn when all the target fields are set.

To take the standard, move one fiber to the exact center, then point the telescope at the flux standard and take a spectrum. Remember to take a comparison spectrum after each standard taken.

VI. Preliminary Results


                   Table 6. Spectra Fits File.

        Bright (object Mag < 18)    Faint (object Mag => 18) 			 
        Total  1   2   3   4   5    Total  1   2   3   4   5
--------------------------------------------------------------
GalPln   279   71  60  58  45
--------------------------------------------------------------

                   Table 7. IRAF File.

        Bright (object Mag < 18)    Faint (object Mag => 18) 			 
        Total  1   2   3   4   5    Total  1   2   3   4   5
--------------------------------------------------------------
GalPln   279   71  60  58  45
--------------------------------------------------------------

Click a number to get that file.

Ping Zhao: zhao@cfa.harvard.edu