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Дата изменения: Thu Sep 6 11:25:36 2001
Дата индексирования: Sun Apr 10 01:52:43 2016
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Instrument Orientations and Offset Directions

Instrument Orientations and Offset Directions

"Stop the insanity."


IRAF View

This is the orientation of the image as viewed in an image display via IRAF (e.g. ximtool, saoimage). Note: This is different from the orientation of the image as viewed on a Macintosh, via Remark. Scroll down the page for the Macintosh orientation.

A +X, +Y instrument offset will move a star in the direction indicated
by the arrows.  Directions of East and North are given for 0 degrees
object rotation.  Note: The offset direction depends upon which
interface the offset command was issued in!

INTERFACE:         TCC               MC              REMARK

                    N                 N                 N
GrIm2          -----------       -----------       -----------
f/5           |     ^     |     |           |     |           |
              |     |y    |     |       x   |     |       x   |
             E|  <--*     |    E|     *-->  |    E|     *-->  | 
              |   x       |     |    y|     |     |    y|     |
              |           |     |     V     |     |     V     |
               -----------       -----------       -----------


GrIm2          -----------       -----------       -----------
f/10,         |           |     |     ^     |     |     ^     |
f/20          |   x       |     |    y|     |     |    y|     |
             E|  <--*     |    E|     *-->  |    E|     *-->  | 
              |     |y    |     |       x   |     |       x   |
              |     V     |     |           |     |           |
               -----------       -----------       -----------
                    N                 N                 N

                    N                 N                 N
SPIcam         -----------       -----------       -----------
              |     ^     |     |           |     |           |
              |    y|     |     |      x    |     |    x      |
             E|     *-->  |    E|     *-->  |    E|  <--*     |
              |      x    |     |    y|     |     |     |y    |
              |           |     |     V     |     |     V     |
               -----------       -----------       -----------



DIS            -----------       -----------       -----------
              |           |     |     ^     |     |     ^     |
              |      x    |     |     |y    |     |    y|     |
             E|     *-->  |    E|     *-->  |    E|     *-->  |
              |    y|     |     |      x    |     |      x    |
              |     V     |     |           |     |           |
               -----------       -----------       -----------
                    N                 N                 N


DIS                 N                 N                 N
slit cam       -----------       -----------       -----------
              |           |     |     ^     |     |     ^     |
              |      x    |     |     |y    |     |     |y    |
             E|     *-->  |    E|  <--*     |    E|  <--*     | 
              |    y|     |     |   x       |     |   x       |
              |     V     |     |           |     |           |
               -----------       -----------       -----------



Echelle        -----------       -----------       -----------
slit cam      |     ^     |     |           |     |           |
              |    y|     |     |      x    |     |    x      |
              |     *-->  |     |     *-->  |     |  <--*     |
              |      x    |     |    y|     |     |     |y    |
              |           |     |     V     |     |     V     |
               -----------       -----------       -----------



AOTF           -----------       -----------       -----------
              |           |     |     ^     |     |     ^     |
              |      x    |     |    y|     |     |     |y    |
              |     *-->  |     |     *-->  |     |  <--*     |
              |    y|     |     |      x    |     |    x      |
              |     V     |     |           |     |           |
               -----------       -----------       -----------





MACINTOSH View

This is the orientation of the image as viewed on a Macintosh (i.e. as displayed by Remark). Note: This is different from the orientation of the image as viewed by IRAF. Scroll up the page for the IRAF orientation.

A +X, +Y instrument offset will move a star in the direction indicated
by the arrows.  Directions of East and North are given for 0 degrees
object rotation.  Note: The offset direction depends upon which
interface the offset command was issued in!

INTERFACE:         TCC               MC              REMARK


GrIm2          -----------       -----------       -----------
f/5           |           |     |     ^     |     |     ^     |
              |    x      |     |    y|     |     |    y|     |
             E|  <--*     |    E|     *-->  |    E|     *-->  | 
              |     |y    |     |           |     |       x   |
              |     V     |     |           |     |           |
               -----------       -----------       -----------
                    N                 N                 N

                    N                 N                 N
GrIm2          -----------       -----------       -----------
f/10,         |     ^     |     |           |     |           |
f/20          |     |y    |     |      x    |     |      x    |
             E|  <--*     |    E|     *-->  |    E|     *-->  | 
              |    x      |     |    y|     |     |    y|     |
              |           |     |     V     |     |     V     |
               -----------       -----------       -----------


                    N                 N                 N
DIS            -----------       -----------       -----------
              |     ^     |     |           |     |           |
              |     |y    |     |      x    |     |      x    |
             E|     *-->  |    E|     *-->  |    E|     *-->  |
              |           |     |     |y    |     |    y|     |
              |           |     |     V     |     |     V     |
               -----------       -----------       -----------



Echelle        -----------       -----------       -----------
slit cam      |           |     |     ^     |     |     ^     |
              |      x    |     |    y|     |     |     |y    |
              |     *-->  |     |     *-->  |     |  <--*     |
              |    y|     |     |      x    |     |    x      |
              |     V     |     |           |     |           |
               -----------       -----------       -----------



K. Gloria - June, 1999
updated R. McMillan - September, 2001