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DarkRidgeObservatory.org 1
Eclipsing Binary Star Program, Eclipsing Binary Star Program, Hardware and SoftwareHardware and Software
Thomas C. SmithThomas C. SmithDirector, Dark Ridge ObservatoryDirector, Dark Ridge Observatory
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Observing Project GoalsObserving Project Goals
Specific Points of interest– Automated EB Observing Program– Automatic Observatory Operations– Automatic Data Collection and Reduction– System Health Notification Process
Using equipment and software that is commonly available to the amateur, an automatic EB program of study will be carried out.
– Telescope is a Meade 14” LX200GPS mounted equatorially on a heavy-duty wedge.
– CCD Camera is an ST-7XE USB non-antiblooming, blue-enhanced system from SBIG.
– Software is TheSky, CCDSoft, TPoint, and Orchestrate from Software Bisque also MIRA AP-7 from Axiom Research.
Programming will utilize the ASCOM or RASCOM standard objects that integrate with the above software and hardware.
Bisque.com / Axiom.com
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Observatory, Telescope and Observatory, Telescope and MountingMounting
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ST-7XE CCD SpecificationsST-7XE CCD SpecificationsCCD Kodak KAF-0401E + TI TC-211
Pixel Array 765 x 510 pixels, 6.9 x 4.6 mm, Total Pixels 390,000
Pixel Size 9 x 9 microns
Full Well Capacity (NABG) ~100,000 e-, Dark Current 1e¯/pixel/sec at 0° C
Non ABG, Shutter Electromechanical
Exposure 0.11 to 3600 seconds, 10ms resolution, Correlated Double Sampling
A/D Converter 16 bits, A/D Gain 2.3e¯/ADU, Read Noise 15e¯ RMS
Binning Modes 1 x 1, 2 x 2, 3 x 3
Pixel Digitization Rate Up to 420,000 pixels per second
Full Frame Acquisition ~1 second
Specs Per SBIG
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ST-7XE Optical SpecificationsST-7XE Optical Specifications
Using an 8" f/10 system
Field of View 12 x 8 arcminutes
Pixel Size .9 x .9 arcseconds
Limiting Magnitude Magnitude 14 in 1 second
(for 3 arcsec FWHM stars) Magnitude 18 in 1 minute
Specs Per SBIG
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ST-7XE System SpecificationsST-7XE System Specifications
Cooling - standard Single Stage Thermoelectric, Active Fan, Water Assist Ready
-45 C from Ambient Typical
Temperature Regulation ±0.1°C
Power 5 VDC at 1.5 amps, ±12 VDC at 0.5 amp
Computer Interface USB
Computer Compatibility Windows 95/98/NT/2000/Me/XP
Guiding Dual CCD Self-Guiding
Specs Per SBIG
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ST-7XE Physical DimensionsST-7XE Physical Dimensions
Optical Head 5 inches diameter x 3 inches 12.5 cm diameter x 7.5 deep 2 pounds/0.9 Kg
CPU All electronics integrated into Optical Head, No CPU
Mounting T-Thread, 1.25" and 2" nosepieces
Backfocus 0.92 inches/2.3 cm
Specs Per SBIG
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Running System Flow DiagramRunning System Flow Diagram
This is a preliminary flow diagram of a normal observing session run. The system is continuously performing self monitoring to ensure that appropriate actions are taken.
Program Script
Proceed toTelescope?
WeatherTelemetrySystem
WeatherMonitor
PositionTelescope
Position FilterWheel
NO
YES
Environmental Conditions Acceptable for Program Run
CCD ImageAquisition
ObservatoryOperational?
PrepareObservatory
YES
NOProgram
Parameters
Scope inPosition?
Filter in Place?YES
YES
NONO
ImageAquired?
YESImage Storage
SystemYES Image Stored?
NO NO
ScriptComplete?
NO
YES, Next Program Step
ProgramInitializationand Begin
Update Observatory Ready Parameter
Enter ShutdownProcess
YES
0 to N loops
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System Shutdown ProcessSystem Shutdown Process
TelescopePosition
Telemetry
Park Scopes Close Roof
FTP Results
Roof Clear& PositionTelemetry
ShutdownSystem
ProgramSleep
ScopesParked?
Roof Closed?
NO NO
YES
DataReceived?
SystemReported
Shutdown?
NO
YES
NO
YES
YESShutdownProcess
When the system has completed the programmed loops or an error condition is raised, the system will enter the shutdown process.
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Flow Control System: Flow Control System: Environmental Monitoring SystemEnvironmental Monitoring System
The environmental monitoring system will be responsible for the following items– Cloud cover and precipitation anticipation– OTA to Ambient delta-T measurements– Wind speed– Lightening strike detection– Ambient light conditions– Smoke / Fire detection system
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Flow Control System: Flow Control System: Observatory OperationsObservatory Operations
The observatory operations system will be responsible for the following items– Roof position detection– OTA park-position detection– AC/DC power monitoring– Internal lighting system control– Observatory “flat” screen illumination and filtering
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Flow Control System: Flow Control System: Telescope ControlTelescope Control
The telescope control and positioning system will be responsible for the following items– Telescope pointing and tracking– Target acquisition and centering– Auto guiding (using the ST-7XE guider)– Telescope park and shutdown initiation
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Flow Control System: Flow Control System: CCD Camera and Filter WheelCCD Camera and Filter Wheel
The camera and filter wheel system will be responsible for the following items– Creating calibration “dark” and “flat” exposures– Filter position indexing– Auto guiding system control signal generation– Target exposure / integration– Data signal conversion and storage
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System Shutdown: System Shutdown: Park ScopePark Scope
The telescope control system will position the telescope into the “park” position in preparation for roof closure
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System Shutdown: System Shutdown: ObservatoryObservatory Roof ClosureRoof Closure
Once the telescope is “parked” the roof closure system will:– Verify the roof is clear to close using a two-detector
system that utilizes infrared detectors.– Close the roof using the DC motors to the fully shut
position as indicated by redundant limit switches– Power down the observatory roof circuits
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System Shutdown: System Shutdown: Data File transferData File transfer
The data file transfer system will be responsible for the following items– Moving the collected data files onto a server utilizing a
wireless network.– Verify the file move succeeded– Delete the local file copy– Initiate the remote data analysis software– System health and heartbeat message creation– System error message creation and notifications
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ProceduresProcedures
Detailed system startup, operation and shutdown procedures will be created and followed to ensure data integrity and repeatability
Target or opportunity program suspension procedures and processes will be available with “smart” subsequent program step resumption
FOR MORE INFO...
Procedures will be maintained on the project web site at http://www.DarkRidgeObservatory.org
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ScheduleSchedule
–Hardware and observatory construction (Jun 2003 – Oct 2003)
–System testing and automation processes (Sept 2003 – Dec 2003)
–Observing program initiation (Sept 2003 – Nov 2003)
–Scientific program of study (Sept 2003 – Kepler Launch)
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