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Dark Ridge Observatory (DRO)

 

Site

Latitude and longitude: 32:48:12N, 105:28:29W (+32.80333, -105.4747)
Elevation: 7100ft (2164m)

Site manager: Tom Smith

Internet access:  DSL

Weather statistics: 30% photometric, 40% usable, 30% cloudy

Typical good seasons: April-June and September-October

 

Telescopes at the Dark Ridge Observatory:

APASS North

 

APASS North

Telescope
Type: corrected Newtonian

Aperture: 20cm

Focal length: 720mm

F-ratio: 3.6

Focuser: OKI electronic

 

Mount
Paramount ME

pointing accuracy: 1arcmin

maximum unguided tracking

restrictions, if any: 5mins

Computer: Linux

Software: TheSky, MaxIm DL, ACP, ACP Scheduler

Telecope Advocate: A. Henden

 

Imaging

Typical seeing: 1-2arcsec

Best seeing: 1arcsec

Vignetting: severe; 30%

Scattered light: some, taken out in processing

 

Camera

Image defects: bad column

Type: Apogee U16m

Filter wheel: Apogee 7s

Filters: B,V,u,g,r,i,z

Exposure ratios/filter:

Pixel count: 4096x4096

Pixel scale: 2.56 arcsec/pix

Field of view: 2.9x2.9 degrees

Gain: 2.69

Readnoise: 9.21

Linearity (graph)

Full well: 80Ke-

Cosmetic defects:

Dark current:

Read time: 25sec

Shortest exposure: 0.2sec (3sec recommended)

Compressed image size: 10MB

QE response (graph)

 

Typical Use of System

All-sky survey; some bright-time projects

 

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484