Sutter Creek Observatory
Latitude and longitude: 38 22'47"N 120 46'31"W (+38.3796, -120.7751)
Site manager: Bill Goff
Typical good seasons:
Wright 30 (W30) - Donated by the late Paul Wright
Type: 12-inch Meade LX-200 (Classic)
Focal length: 3050mm
Focuser: Optec TCF-S
Meade LX-200 (Classic) fork
Pointing accuracy : Typically 2 – 4 arcminutes 'in the blind', but after a plate solve/reslew pointing error is reduced to 40 arc seconds or less. Maximum unguided tracking restrictions, if any: 60 seconds
Computer: PC/Win XP
Software: Maxim for CCD/filter wheel control. TheSky6Pro/TPoint for scope control and pointing model. FocusMax for focuser control. ACP and ACP Scheduler for overall system operation.
Telecope Advocate: Elizabeth Waagen
Typical seeing: Note. Images are intentionally defocused with the goal of FWHM 2.2 pixel radius. At best focus this scope delivers undersampled images.
Scattered light: After flat fielding, photometric errors are at the 1 – 2% level across the entire field. (Arne has verified this with raster scan multi-image tests.)
Image defects: None
Type: SBIG STL-1001E
Filter wheel: SBIG 8-position
Filters: BVRIg'r'i'z' (Astrodon 3mm thick interference filters)
Exposure ratios/filter: C=0.25 B=3.0 V=1.0 R=0.55 I=1.1 (Note – if your target is a very red star, expect to shorten R and I exposures and lengthen B exposures...assuming V exposures remain constant.)
Pixel count: 1024x1024
Pixel scale: 1.65 arcsec/pixel
Field of view: 28 x 28 arc minutes
Full well: Above 55,000 ADU the response is no longer linear.
Cosmetic defects: None
Read time: 3 seconds
Shortest exposure: 0.11 sec.
Compressed image size: 420KB
|Star Image||Flat||Bias Frame||Dark Frame|
Typical use of system
Mostly long time-series, with multi-filter 'snapshot' coverage filling in the rest of the night.
Calibrated images are 16-bit, but can have negative values, and non-integer values. You may have to set up your photometry software to specifically deal with this situation (some software deals with it automatically, some does not).
Last Updated: January 28, 2013 - 10:05am