OF THE ROGER N. CLARK
OF THE ROGER N. CLARK
OF THE ROGER N. CLARK
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VISUAL ASTRONOMY <strong>OF</strong> <strong>THE</strong> DEEP SKY<br />
-<br />
Optimum Detection Magnification<br />
size<br />
for a given telescope aperture<br />
ID v mag arc -min S.B. Cl 2 4 6 8 12 16 24<br />
- - - - - - - -1 - - - - - 1 - - - - - - - - -1 - - - - 1 - - - - 1 - - - - 1 - - - - 1 - - - -1 - - - - 1 - - - -1 - - - -1<br />
- - - _<br />
NGC 7510 9. 3x3 20 .0 1.7 89 38 28 27 41 54 8 1<br />
NGC 7582 11 .8 3.0x3 .0 22 .8 0.6 89 38 28 27 41 54 8 1<br />
NGC 7590 11.9 2.2xO .8 21 .1 1.2 450 450 436 306 187 131 101<br />
NGC 7599 12 .0 3.8x1 .2 22 .3 0.8 300 290 177 124 76 67 8 1<br />
NGC 7619 12 .6 0.8xO .6 20 .4 1.5<br />
11 .<br />
600 600 581 354 249 152<br />
NGC 7626 12 .7 0.9xO .7 20 .8 1.4 514 514<br />
251<br />
NGC 7635<br />
10x5 23 .9 0.1 29 16 20 27 41 54 81<br />
NGC 7654<br />
12x12 21 .0 1.3 7 14 20<br />
41 54 81<br />
NGC 7662 8.5 0.5xO .5 15 .6 3.5 720 720 720 720 531<br />
7.<br />
NGC 7789 10 . 20x20 25 .1 -0.4 7 14 20 27 41<br />
NGC 7793<br />
9.7<br />
412<br />
6.0x4 .0 21 . 8 1.0 47 22 20 27 41<br />
27<br />
177 122<br />
373 227<br />
54<br />
81<br />
54 81<br />
APPENDIX F: OPTIMUM DETECTION MAGNIFICATIONS FOR DEEP-SKY OBJECTS<br />
Table F.S. Sample FORTRAN computer program: TELEODM<br />
=-<br />
c<br />
this program computes the optimum detection<br />
c<br />
magnification (odm ) values and gene ra tes<br />
c<br />
entries like those in the Appendix F ca ta 10g.<br />
c<br />
c . opts iz optimum size (angle)<br />
c opower optimum detect ion magnificat ion on an object<br />
c odm optimum de tect ion magnificat ion on an object<br />
c<br />
for each telescope size given by tele<br />
c<br />
powe r telesc ope 's power<br />
c<br />
tele telesc ope 's aperture in inches<br />
c<br />
tmag te lescope 's limiting magnitude<br />
implicit integer*4 (i-n)<br />
integer*4 odm, crtin , crtout<br />
rea1*4 tele , mb , tmag<br />
charac ter*80 in , in2<br />
character*l il, ihx , ihblnk<br />
data ihx , ihblnk I'x' , ' 'I<br />
crtin = 0<br />
crtout = 0<br />
1 wr ite (crtout , 2)<br />
2 format (lx, '***** Program Teleodm: Telescope Opt imum Detection' ,<br />
c<br />
c<br />
1 ' Magni fica tion ***** ' ,11, 1 x,<br />
2 'Enter the telescope aperture in inches ' )<br />
read (crtin,*) tele<br />
if (tele .le. 0.01) go to 1<br />
size 1 0.0<br />
size2 0.0<br />
c sbO is the background surface brightness. You could add a<br />
c read statement to input this value to examine other sky<br />
c<br />
c<br />
cond itions<br />
sbO 24 .25<br />
sb 0.0<br />
c determine fain te st star based on equa tion 4.1 (= tmag) :<br />
c dmm = telescope's aperture in mi 11imeters<br />
c dsube = aperture of eye in mi 11imeters<br />
c trans = telescope transmission fa ctor<br />
c trans = 0.7<br />
c dmm = te1e* 25 .4<br />
c dsube = 7.5<br />
c tmag = 8.5 + 2.5* alog10(dmm*dmm*trans/(dsube*dsube »<br />
338<br />
339
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