## 4 Meter

The plate scale at F/8 is 6.624 arcsec/mm

The plate scale at F/15 is 3.64 arcsec/mm

The primary clear aperture is 3.797m

The secondary clear aperture is 1.65m

The F/8 focus clear aperture at Cass is 6.2"

The diameter of the hatch in the cass cage bottom is 48"

The diameter of the cage opening, without the bottom,
is 106"

The distance from the cage bottom to the bottom of the guider is 61"

The weight of the rotator is 1300 lbs

The weight of the guider is 800 lbs

The weight of the cass cage bottom is 1300 lbs

The door opening to the coude room is 93" wide X 95" tall

The RCS handling cart with RSC in it is 69" X 72" X 84"

The largest box that fits in the elevator is 58" X 37"

The cable run from the cage to the console room is 150'

The cable run from the cage to the computer room is 150'

The diameter of the opening in the guider is 20.25" +/-.003"

The diameter of the recess in the guider is 31" +/-.003"

The depth of the recess in the guider is .320" +/- .01"

The instrument mounting bolt center diameter on the guider is 35"

The size and depth of the mounting holes on the guider are 5/8-11 x 1.00

The travel of the S guide probe for focus is +/- .312" from center

The guider probe has approxomately 2000 motor steps

The encoder readings for the guide probe are from 10-426, where
10 is all the way out

The back focus from the guider to focal plane at F/8 is 6"

The back focus from the guider to the focal plane for F/15 is 17"

The focus travel of the prime focus pedestal is +/- 1.4" from center

There are 4 filters in the ILS side of the guider:

A = Blue BG37 1mm thick

B = Red OG 590 2mm thick

C = Neutral Density (NG-3) ~2.5 mag (4500-6500l) 1mm thick

D = Clear 1mm thick quartz plate

Pickoff mirror move times:

From position 1 - 2 is 7 seconds

From position 2 - 3 is 11 seconds

From position 3 - 4 is 13 seconds

The tube weights can make up for 400 lbs

The regular cass cage bottom, with no weights, weighs 1300 lbs

The weight of the prime focus corrector is 380 lbs

## 2 Meter

The plate scale at F/8 is 12.685 arcsec/mm

The plate scale at F/15 is 6.5 arcsec/mm

The primary clear aperture is 2.12 m

The central obstruction is 1.12 m

The weight of the rotator is 347 lbs

The weight of the rotator cart is 153 lbs

The weight of the Gold Guider is 150 lbs

The weight of the Gold Guider cart is 106 lbs

The distance from platform to bottom of telescope is 81"

The distance from platform to the cell at top of travel is 39"

The distance from platform to indicator is 75"

The distance from platform to rotator readout box is 75.75"

The distance from platform to rotator hand-crank is 75.25"

The distance from platform to bottom of rotator is 78"

The distance from platform to bottom of guider is 67"

The width of the platform is 85"

The distance from bottom of telescope to horse shoe is 62"
**Note: Flamingos limit is set at 61.23"**

The platform load rating is:

1st stage (38" to 51" from floor) 2000 lbs

2nd stage (51" to 65" from floor) 1000 lbs

3rd stage (65" to 80" from floor) 500 lbs

The foot print (envelope) of the elevator is 112" X 63.5"

Inside the hand rails of the elevator it is 112" X 61"

The distance for cable drape from a telescope instrument to the control
room is 45'

The outer diameter of the rotator is 36.5"

The diameter of the rotator mounting ring to telescope is 32.187"

The depth of recess of the rotator in the telescope is .25"

The diameter of the rotator instrument mounting pocket is 25.1"

The largest outer diameter of a instrument you can install on the
rotator is 25.1"

The depth of the rotator instrument mounting pocket is 2.25"

The instrument mounting bolt center diameter on the rotator is 24"
3/8 -24 TPI

The instrument mounting BC diameter on bottom of guider is 20" 3/8 -16 TPI

The back focus from mounting surface of rotator at f/8 is
14.687"

The back focus from the bottom surface of the guider is 2"

The back focus from mirror cell at F/8 is 15.125"

The nominal back focus for Phoenix at F/15 is 4.2"

The diameter of the recess in the bottom of the guider is 22"

The main mirror belt has 73 teeth

The main mirror hole is 3.06 w X 4.812 h

The comp/flat belt has 172 teeth

The guider test star plate (2x2) hole diameter is 1.6 arcsec or .0051"

The back lash in X/Y stage is 22mm to 27mm

Back lash corresponds to 0.1 arcsec @ F/8

The travel of the X/Y stage (software limits) is:

x = -70 to -41.5 mm, 36.5 to 67 mm

y = -40 to 40 mm

## WIYN

The weight of Hydra is 485 lbs

The weight of WHIRC is 77 lbs

The plate scale is 9.4 arcsec/mm

The primary clear aperture is 3.4988m

The central obstruction is 1.45m

## Instruments

The weight of a universal dewar is 30 lbs

The weight of Mosaic is 480 lbs

The weight of Phoenix is 1,280 lbs

The weight of the Phoenix adaptor is 220 lbs

The weight of the Phoenix cart is 900 lbs

The weight of the RCS is 2000 lbs

The weight of the RCS cart is 700 lbs

The weight of Flamingos is 1,300 lbs

The weight of the Flamingos adaptor is 180 lbs

The weight of the Flamingos cart is 400 lbs

The weight of the Echelle is 2000 lbs

The weight of the Echelle cart is 700 lbs

The weight of Newfirm is 3000 lbs

The weight of the Newfirm cart is 900 lbs

The weight of Kosmos with the cradle is 530 lbs

The weight of the Kosmos adapter is 145 lbs

The weight of the Kosmos cart is 445 lbs

The weight of Gold Cam is 530 lbs

The GoldCam stop limit on the grating is at position 38

The units on the GoldCam counter coorespond to .001"

LN2 fill lines: 3/8 swivel fm flare on one end and 1/2 swivel fm flare on other

A universal dewar fill uses 3 liters of LN2

A Mosaic dewar fill uses 5-6 liters of LN2

1 liter of LN2 weights 1.78 lbs

1 gallon of LN2 weights 6.729 lbs