Steps of the Arrows too large ('move telescope a little bit')

[angelagonzalez]

I was recording the new tutorial of the night experiment, and pointing to some objects like: M92, M13, M51, Mars and Saturn (BOOTES-2, 24th June 2014, 23 UT - 23 UT), when I realized that the telescope didn't point well.

Then, I tried to solve it by using the arrows of 'move telescope a bit', but the movement of each arrow is too large and the target passes by.

I attach three compositions made with Aladin (M51, Saturn and Mars) which show that the step is too large to capture the whole image of the target.

I tested all the possible combinations of arrows, but the only one which works is to use 'down' alone, which in fact is like "moving left" the image.

In order to clarify the issue I list here the coordinates of some of the fits files headers:

M51: RA= '253.7627416561472' DEC= '3.1489171580749082' M51+DOWN: RA= '202.4709608413662' DEC= '46.995170979907634' SATURN: RA= '225.200198766565' DEC= '-14.619995583914354' SATURN+DOWN: RA= '225.19944896605006' DEC= '-14.819925632871977' MARS: RA= '250.22409062434238' DEC= '36.46130506270808' MARS+DOWN: RA= '194.48481879378235' DEC= '-6.5577298286733'

• Please, could you tell me what is each arrow actually supposed to do? I cannot see the relationship between clicking on 'DOWN' and the image moving left, or the ecuatorial coordinates decreasing / increasing (randomly?).
• Furthermore, could you decrease the lenght of each arrow step so that the target does not passes by when clicking on it?

[mclopez-uma]

I have been checking with RTS2 telescope responsibles (Jan and Mates) that the way this kind of movement is implemented is correct, when using the arrows the mount is suppose to move towards North, South, East, West using the OFFS property of the mount. It is well implemented but I have realized two things:

• This property is NOT reset when a movement command is sent with the same position as the one before.
• On Bootes2 when trying to move N/S RTS2 throws an error: B2 error: DATA ERROR HA.OFFSET FAILED 2\r. Although the error is thrown, the mount moves but it moves not only in N/S direction but also in W/E, not too much but a little bit. This behaviour also happens when moving W/E but the error is not thrown.

Regarding the amount of movement, I will modify it to be configurable. Please, let me know the increase you want. I will have this improvement as well as the OFFS reset ASAP.

[mclopez-uma]

Jan has told me to set the offset to 0.05 on Bart and 0.03 on D50 (1/10 FOV)

[angelagonzalez]

I've just asked them about it (including MJ, RC and AC-T).

[angelagonzalez]

BOOTES-1A: 30' (1/10 FOV; FOV=5ºx5º) BOOTES-2 y BOOTES-3: 1' (1/10 FOV; FOV=10'x10')

[mclopez-uma]

Desplegado.