public StarProspect OffsetCenter(StarProspect tgtStar, double imagePA)
{
/*Calculates an offset position that places the input position in the center
* of the guider FOV.
*
* Note that the bearing for moving off the target star is opposite for different
* sides of the pier. If the scope is peering over the meridian, then this wont work
* well.
*/
//Set the star chart FOV 4 times the y distance (arcmin) center of the ccd
// fov to the center of the guider fov -- not really needed but helps viewing during processing
SetStarChartSize();
// Convert target star RA and Dec to radians and place in RA/Dec structure
double tgtRA = Transform.HoursToRadians(tgtStar.StarRA);
double tgtDec = Transform.DegreesToRadians(tgtStar.StarDec);
Celestial.RADec tgtStarPosition = new Celestial.RADec(tgtRA, tgtDec);
// Compute the rotation (radians) associated with any guider FOV offset from the image PA
double gRotationR = -Math.Atan2(gfov.CenterX, gfov.CenterY);
// Increment the image PA by the guider offset
double bearingR = gRotationR + Transform.DegreesToRadians(imagePA);
// Reverse bearing if the mount is pointing east
//if (!pierEast) { bearingR = -bearingR; }
// Compute the distance beween the center of the Image FOV and the center of the Guider FOV
double distanceR = Transform.DegreesToRadians((SumOfSquares(gfov.CenterX, gfov.CenterY)) / 60.0);
// Calculate an offset position such that the guider FOV will have the target star in its center
//Celestial.RADec endPosition = Celestial.Travel(tgtStarPosition, -gVectorR, gRotationR);
Celestial.RADec endPosition = Celestial.ComputePositionFromBearingAndRange(tgtStarPosition, bearingR, -distanceR);
// Convert this position back to hours and degrees (RA and Dec) and return the result
// as a DBQStar structure
StarProspect endStar = new StarProspect()
{
StarRA = Transform.RadiansToHours(endPosition.RA),
StarDec = Transform.RadiansToDegrees(endPosition.Dec)
};
return(endStar);
}
private void PickButton_Click(object sender, EventArgs e)
{
PickButton.BackColor = Color.LightSalmon;
StartButton.BackColor = Color.LightSalmon;
//Pick up the target star location as selected in TSX Star Chart
MessageBox.Show("Select target star");
WriteLog("Picking up coordinates of selected target star");
sky6ObjectInformation tsxoi = new sky6ObjectInformation();
StarProspect foundStar = new StarProspect();
tsxoi.Index = 0;
tsxoi.Property(Sk6ObjectInformationProperty.sk6ObjInfoProp_NAME1);
foundStar.StarName = (tsxoi.ObjInfoPropOut);
tsxoi.Property(Sk6ObjectInformationProperty.sk6ObjInfoProp_RA_2000);
foundStar.StarRA = (tsxoi.ObjInfoPropOut);
tsxoi.Property(Sk6ObjectInformationProperty.sk6ObjInfoProp_DEC_2000);
foundStar.StarDec = (tsxoi.ObjInfoPropOut);
tsxoi.Property(Sk6ObjectInformationProperty.sk6ObjInfoProp_MAG);
foundStar.StarMag = (tsxoi.ObjInfoPropOut);
WriteLog("Target star found: " + foundStar.StarName);
//Closed Loop Slew (following standard slew -- see notes) to the target guide star
WriteLog("Centering imaging camera on target star");
bool slewDone1 = SlewToStar(foundStar.StarName, foundStar.StarRA, foundStar.StarDec);
if (slewDone1)
{
WriteLog("Target star centered");
}
else
{
WriteLog("There was a problem centering the target star");
}
//Calculate a pointing position that would put the target star in the guider FOV
WriteLog("Calculating offset for centering star in guider FOV");
StarProspect tgtPosition = guiderFOV.OffsetCenter(foundStar, imagePA);
WriteLog("Offset calculated for pointing at " + tgtPosition.StarRA.ToString("0.000") + " , " + tgtPosition.StarDec.ToString("0.000"));
//Closed Loop Slew (following standard slew -- see notes) to that offset position
WriteLog("Centering target star in guider FOV");
bool slewDone = SlewToPosition(tgtPosition.StarRA, tgtPosition.StarDec);
if (slewDone1)
{
WriteLog("Target star centered in guider FOV");
}
else
{
WriteLog("Could not recenter the target star");
}
//plate solve current location -- not necessary but it sets up the star chart nicely for viewing
// note that we are not in such a hurry that we can't mess around a bit
WriteLog("Checking offset position with a plate solve");
imagePA = PlateSolve();
//Reset the chart size for something pleasant around the FOVI's
guiderFOV.SetStarChartSize();
//center the star chart on the pointing location == once again, for esthetic purposes
WriteLog("Recentering chart");
sky6StarChart tsxsc = new sky6StarChart
{
RightAscension = tgtPosition.StarRA,
Declination = tgtPosition.StarDec
};
WriteLog("Target star centered in Guider FOV");
PickButton.BackColor = Color.LightGreen;
StartButton.BackColor = Color.LightGreen;
OptimizeButton.Enabled = true;
CalibrateButton.Enabled = true;
OptimizeButton.BackColor = Color.LightGreen;
CalibrateButton.BackColor = Color.LightGreen;
//all done
return;
}