STRUMENTAZIONE
PRECEDENTE
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OTTICHE
Rutten-Maksutov "Rumak" D=127 mm F=1270mm @f/10 
Rifrattore apo ORION 80 ED D=80 mm F=600mm @f7,5 
Flat Cylinder Box |
CAMERE CCD
Atik 16 hr Sensore: Sony ICX285AL Exview HAD Dimensione sensore: 10.2 x 8.3mm Dimensione dei pixels: 6.45 x 6.45 microns Formato immagine: 1392 x 1024 pixels
Starlight-Xpress mx916 + star 2000 + mk2 Sensore: Sony ICX083AL SuperHAD CCD Dimensione sensore: 8.7mm x 6.5mm Dimensione dei pixels: 11.6 x 11.2 microns Formato immagine: 752 x 580 pixels Starlight-Xpress mx5c + star 2000 + mk2 Sensore: Sony ICX055CK CCD Dimensione sensore: 3.7mm x 4.9mm Dimensione dei pixels: 12.6 x 9.8 microns Formato immagine: 500 x 290 pixels  configurazione ok: (intes + bin1x1) 1) backlash 0° 0' 10'' 2) guida a 0,75 x  |
| 27 Agosto 2007 (aggiunto secondo cercatore) | ||
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| setup del 24 Agosto 2007 (aggiunti anelli decentrabili) | ||
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Calculation
of guide speed in pixels per second (pps)
-----------------------------------------------------
pps in declination
= (MS-1)/(B*240*arctan(P/1000F)) pixels per second
pps in r.a.
= (MS-1)*cos(d)/(B*240*arctan(P/1000F)) pixels per second
Here is :
MS = Mount
speed, related to sideral speed, such as 1.5x or 2x (**)
( Is never
< 1, otherwise you could not move in positive direction!)
B = the binning
you are using. 1 = 1x1 binning, 2 = 2x2 binning
P = the pixel
size of your camera in microns, such as 8.6 micron
F = the focal
length of your (guide) scope
d = the declination
of your guide star
If you calculate
arctan or cos, be sure your calculator is set to 'degrees'.
(**) With some
mounts like the Vixen GP or GPDX, the real guiding speed is
set, such
as 1.5x or 2x. With some mounts however, the setting can be quite
confusing.
Sometimes, the guide speed is set as 'the percentage of sideral speed
above the
normal sideral speed'. In that case, a setting of 60 would mean
in fact 1.6x.
When the guide
speed is set to 2x and the mount moves in +RA, it runs at a
speed of 2x
the star speed. When it 'moves' in -RA, the motor stops, so that
the star is
moving in the other direction on your chip with the same speed.
That means
that it is not adviced to use a guide speed of more than 2x.
When the quide
speed is more than 2x, it means that the RA motor has to be
reversed (
like it is the case in declination ). That would mean that backlash
becomes important
here. As long as the guide speed remains between 1 and 2,
your R.A.
motor does not have to reverse and there is no backlash in R.A.
I hope this
will help a bit.
Amities,
Patrick
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celestron acromatico r6 gt D=152mm F=1200mm @f/8 (come guida e ripresa con la mx5c e con l'atik 16 hr tra il 2004 - 2006) |
rifrattore acromatico Ziel D=70mm F=500mm @f/7,14 (usato come guida tra il 2005 e il 2006) |
newton skyline D=200mm F=600mm @f/3,3 (acquistato a Milano nel 2000 usato fino al 2001) |
teleobiettivo jupiter D=50mm F=200mm @f/4 usato sin dal 1997 e ancora oggi |
rifrattore acromatico konus D=60mm F=700mm @f/11,6 (usato nel 2004) |
rifrattore acromatico konus D=60mm F=700mm @f/11,6 (usato nel 2004) |
D=114mm F=900mm @f/7,9 (usato dal 1994 al 2004) |
D=114mm F=900mm @f/7,9 (usato dal 1994 al 2004) |
Carlo (come accecare un astrofilo che, dopo due ore di buio totale si e' adattato al buio ...) |
(come stressare un telescopio ...) |
(lo so ... lo so ... dopo sta flesciata e' difficile capire cosa puntare ... :))) |
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