Problem slewing to ngc 188

[woldsman]

Forecast was not great tonight so decided to image NGC 188 as it’s an open cluster. Luminance filter went fine but after focussing the green filter manually at Dubhe, I was unable to slew back to the target. Scope insisted on going to RA 2 39 31 DEC 84 27 24. This was around 11.10pm U.K. time.  Target coordinates were RA 00 48 25 DEC 85 14 59. I realise proximity of NGC 188 to Polaris must be the issue but I don’t know or can’t work out what the exact impediment is. Can anyone put me right?

[AMcD]

If the target was close to the zenith when you tried to slew back to it, I would check your mount safety limits (if you have them).  I had a similar difficulty recently on my Losmandy G11.   Both my East and West safety limits were set to less than 90 degrees following the installation of a new and much larger camera and filter wheel.  This had the effect of preventing the mount from accessing an area around the Zenith.  When I increased the safety limit on the West to 120 degrees (still safe for my set up) I could access the zenith again.

[woldsman]

On 17/11/2022 at 20:13, AMcD said:

If the target was close to the zenith when you tried to slew back to it, I would check your mount safety limits (if you have them).  I had a similar difficulty recently on my Losmandy G11.   Both my East and West safety limits were set to less than 90 degrees following the installation of a new and much larger camera and filter wheel.  This had the effect of preventing the mount from accessing an area around the Zenith.  When I increased the safety limit on the West to 120 degrees (still safe for my set up) I could access the zenith again.

Thanks for replying. I think you are spot on!