KPNO 4 Meter Mayall - Basic Parameters and Facts
This page describes the current 4 Meter configuration
- Design concepts for very wide field Prime Focus and Cassegrain configurations
- Additional facts relevant to possible use of the 4 Meter for large science programs
Location:
Longitude: 111:35:59.6 W, Latitude: 31:57:50.5 N, Altitude: 2123.2m MSL
Basic Optical Data
Prime Focus (f/3.1) Corrector and ADC PrismsOpto-Mechanical Assembly - 4 Meter Prime Focus Corrector The 4-m prime focus corrector is described in Jacoby, Liang, Vaughnn, Reed, and Armandroff (1988 SPIE, 3355, 721). Slew TimeCalculated slew and servo settling time for the 4-meter telescope with the new Mayall Active Primary Support (MAPS) implementation. Slew motion occurs in both HA and DEC simultaneously, so the time estimate should use the longer of the two motions. South East Annex PositionThe position of the telescope when at the South East Annex is: |
4MAPS - 4 Meter Active Primary System4MAPS Manual (NOAO only) Risley Prisms - Cass Focus
TelescopeCassegrain Cage Mechanical Data
* datum=back of primary mirror cell
DomeThere are some old (and old-fashioned paper) enormous drawings of the dome and environment, but they are like ancient papyrus and very crowded with information.
|
Mayall HA Operation Limits |
||
---|---|---|
Declination |
Lower Shutter Up
|
Lower Shutter Down
|
+80 | 6:20 | 6:20 |
+70 | 6:20 | 6:20 |
+60 | 5:50 | 6:20 |
+50 | 5:40 | 6:20 |
+40 | 5:15 | 6:05 |
+30 | 4:50 | 5:35 |
+20 | 4:35 | 5:10 |
+10 | 4:15 | 4:50 |
0 | 3:45 | 4:20 |
-10 | 3:10 | 4:00 |
-20 | 2:25 | 3:15 |
-30 | 0:30 | 2:20 |
-40 | --- | --- |
* Note: The Airmass=2.1 limit was determined for Mosaic3. For DESI, with its 1.5 degree field, it's advised to point only to targets of airmass < 2.0 with the lower shutter raised.
Updated on March 31, 2022, 5:51 am