Site, Telescope, Camera, Filters

Site

Observatory Name, Stone Edge Observatory

Site Name, Stone Edge Farm, Post Office Box 487, Sonoma, CA 95476

Telescope Designer, Richard R. Treffers, Starman Systems, LLC


Observatory Code for Minor Planet Center: G52

Telescope

The telescope is a 20 inch Ritchey-Chretien manufactured by RC Optical. It has the following properties:
  • Primary diameter: 20 inches
  • Focal ratio: f8.1
  • Focal length: 4115mm
  • Scale: 50.1 arc-seconds/mm

Camera 

SBIG STXL-6303E camera with a KAF-6303E chip.
Array Size 3072x2048 pixels 

Pixel size 9 microns 

Santa Barbara Instrument Group SBIG STXL 6303E

Uploading bin=1 image of M20 to nova.astrometry.net, here are more details.  
http://nova.astrometry.net/user_images/1096773#original

Field of View: 23.7 x 15.8 arcmin
Radius: 0.238 deg
Pixel Scale at bin=1: 0.464 arcsec/pixel

Filters 

 We are using the same filter set as used in Sloan Digital Sky survey. bought from Asahi.

These are five 50x50mm square filters 5 mm thick. Here are their transmission curves.

u-band
g-band
r-band
i-band
z-band
There is also a narrow (12nm FWHM) band H-alpha filter

+----------+---------+------+--------------+
| FilterID | Name    | Slot | Description  |
+----------+---------+------+--------------+
|        1 | u-band  |    1 | AST0532 A132 |
|        2 | g-band  |    2 | AST0536 A133 |
|        3 | r-band  |    3 | AST0537 A134 |
|        4 | i-band  |    4 | AST0538 A135 |
|        5 | z-band  |    5 | AST0539 A136 |
|        6 | clear   |    6 | ESCO Q320188 |
|        7 | h-alpha |    7 | ZBPA660      |
+----------+---------+------+--------------+
Historical

CCD Camera - 1st one - no longer used

The camera is an STL 1301E Santa Barbara Instrument Group. It has the following properties:

      • Chip: Kodak KAF-1302E/LE
      • Pixels 1280 x 1024
      • Pixels size: 16 x 16 microns
      • Full well: 120,000 electrons
      • Gain (factory spec): 2.3 e/ADU
The chip is thermoelectrically cooled.

We use the Universal Driver and the Linux library developed by Jan Soldan in in the Czech Republic.

It has an integrated filter wheel with filters:

Filters
BoltColor
1red
2green
3blue
4clear
5luminance

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