Kottamia Observatory
National Research Institute of Astronomy and Geophysics (NRIAG)

file:///C:/0MYDOCUM/Kottamia74/Docs/Hassan1998.htm
	Latitude 	29 55' 35.24" N
	Longitude 	31 49' 45.85" E
	Altitude 	482.7 m

Location of Kottamia Observatory: 60 km east of Cairo

Kottamia74OpticsMechanics\MirrorOpticalSystem_CarlZeiss1995.pdf
P.76: Primary Mirror E80% = 0.247 arcsec w/ f=9138.4 �} 1mm


MirrorManual_CarlZeiss.pdf
	ZERODUR
	mirror budget 20.3nm RMS => wave front error 40.6nm
	diametera/thickness 6.2
	18 axially weight balancing system
	16 radially weight balancing system

��Parameters_Kottmia74_2002.pdf


	--------------------------------------------------------------
	Optical system
	--------------------------------------------------------------
	Diameter of M1 (D1)		1888.00 (1930 total diameter)
	Radius curvature of M1 (R1)	-18277.00
	Conic coefficient of M1 (K1)	-1.000
	Normalized central hole		0.15250
	--------------------------------------------------------------
	--------------------------------------------------------------
	Diameter of M2 (D2)		483.00
	Radius of curvature of M2 (R2)	-7380.00
	Conic coefficient of M2 (K2)	-3.012377
	--------------------------------------------------------------
	--------------------------------------------------------------
	normalized back distance	0.1094271
	Focal length of telescope	33984.00
	Distance M1-M2			6990.00
	Distance M2-focal plane		7990.00
	--------------------------------------------------------------

	Weight of M1: 1620 kg
	Density: 2.53 x 10^-3 kg mm^-3
	Modulus of elasticity: 	E   = 9210.6 kpmm
				��  = 0.243
	Radius of M1		r_a = 965 mm
	Radius of inner hole	r_i =  94 mm

	Support radius 		d_inner =  711.69 +/- 1 mm
				d_outer = 1611.55 +/- 1 mm

	Geometrical-optical spot concentration: d_100% = 0.06 arcsec at ��=633nm
	Deformation (optimal support): rms Def = ��/167


	Newtonian focus  f= 9138.5 mm 	F= 4.87	scale=22.54 arcsec/mm 
	Cassegrain focus f=33984   mm 	F=18	scale= 6.09 arcsec/mm