Automatic Meridian Flip in Ekos

Over the past couple of weeks, I worked on a new feature in Ekos: Automatic Meridian Flip.

Equatorial mounts flip after crossing the meridian in order to prevent the imaging equipment train from hitting the tripod. With Ekos, you can set an hour angle limit which if exceeded, the mount will be commnded to flip. The mount must begin tracking east of the meridian in order to the meridian flip to be commanded in Ekos.

When commanding a meridian flip, Ekos will suspend the autoguiding process and waits until the mount completes the flip. Once the mount begins tracking again post meridian flip, Ekos will plate-solve and make any necessary slew commands to bring the mount to the exact location it was tracking prior to the flip.

Next, it will automatically capture a frame and select a suitable guide star, performs calibration, and resumes autoguiding. If In-Sequence focuing is enabled, it will also capture and focus a suitable star. It then resumes the capture process form where it left.

All these steps are completely automated and require no user intervention! Watch the video below for a live demo of this feature!

Joystick support in the next INDI release!

So it took me a couple of days, but I finally got around to adding support for joysticks in INDI. This is very exciting and it became quite important recently when I started using EQMod driver. For now, all LX200 and EQMod drivers supported. I didn't put a lot of functionality into the telescope drivers joystick control section yet, just the basic N/S/E/W motion and selection of slew speeds.

This is particular useful for EQMOd where it was a pain to try to center any star using the INDI control panel, while at the same time, trying to look in the eye piece! Of course, now with Ekos Alignment module & astrometry.net solver I don't have to do that anymore, but this functionality is indeed essentials for all of those tired of jumping back and forth between the scope and the laptop.

All those features will be available in the next INDI Library v0.9.7 release.

Here is a quick video for controlling LX200 GPS:

Demo of Ekos Alignment module

Yesterday, I field tested Ekos Alignment Module using EQMod for Linux driver with my Orion Atlas telescope. The module utilizes astrometry.net solver to find the actual celestial coordinates in a given image, making scope alignment quite a trivial procedure with amazingly accurate GOTOs.

To use Ekos for alignment, first you have to put your telescope in the starting home position, which simply means that it should be leveled and pointed at the North Celestial Pole (NCP), if you are in the northern hemisphere. With my mount (HEQ5), I have a polar finder scope so pointing it at the NCP was quite trivial simply by adjusting the mount altitude and azimuth knobs until polaris is within a small circle designated in the polar find scope.

Next, I fired Ekos and started it with two drivers: EQMod & QSI CCD INDI drivers. It would have been possible to use the Synscan driver, but the driver is very limited compared to EQMod. After you use EQMod, you never look back.

Then I asked EQMod to track a nearby star. Now this is where the magic of Ekos comes. You don't have to do anything yourself! No more looking in the eye piece or CCD image to align your scope. You just hit "solve" and it figures where in the sky the telescope is really pointing. Once it finds a solution, you can ask it to either sync the telescope coordinates to the solution coordinates, or sync and slew back to the target we were tracking just earlier. I set it to "Slew to Target" and I had to stop the first iteration of the solver because it was taking too long, but after adjusting some options (as you can see in the video), the solver only took 8 seconds to find a solution.

Each time the solver finds a solution and syncs, an alignment point is added to EQMod Alignment Model, which is N-Star by default. The more alignment points you have, the more accurate your slews become. I then asked EQMod to track another nearby star and repeated the same process, this time the solver only took 2 seconds. Finally, to show that the alignment is really working, I slewed to M31, took an image, and it was dead in the center!

All those exciting Ekos features are coming up in the next KDE 4.12 release. Have to give a shout-out to Jean-Luc Levaire, INDI EQMod driver developer, and Dustin Lang from astrometry.net for all their hard and beautiful work!

Check out this Youtube video showing the whole process!