• IOptron IPolar Usage With Mac Computer - Page 4 - Equipment ...
• Free Polar Alignment Software
• Polar Alignment App
• Telescope Polar Alignment Software
• All OSX Software For Imaging - CCD/CMOS Astro Camera Imaging ...

Winjupos - planetary processing software for derotation/mapping/planetary moon alignment. DigiCamControl - Free camera control for those with Nikon DSLRs. PEMPro - periodic error correction, polar alignment and backlash using your CCD Camera or Webcam. Sofortbild - Free capture control for mac + nikon. ‎Polar Scope Align will calculate the position of Polaris or σ Octantis in your Polar Scope reticle for your location (using your phone's GPS or manually), allowing a quick and accurate polar alignment. It is one of the few programs that are accurate in lower latitudes by correcting for atmospheric r.

Introduction

1. This polar camera is excellent! I mounted mine in a iOptron IEQ45 Pro. Usually polar alignment takes about 15 minutes with the scope. With the iPolar about 5 minutes and the rig is aligned much better than with the original polar scope.
2. Has new features, one of which is a useful drift align tool. EQAlign - see link below under guiding software. Can do polar alignment as well. Guiding Software:.PHD2 (OpenPHD) (Win/Mac) - the next generation of Craig Stark's PHD (see PHD below). Has new features and enhancements. PHD Guiding (Win/Mac) - by far the most popular guiding software.
3. Polar Alignment tool: an easy tool for doing polar alignment with software and your camera insteade of the polar scope Free Download of SharpCap: The best free webcam astronomy software Download Version 3. I did all the processing for this photo using libre software. Note for MAC and Linux Users. Either by recording the drift of a star.

Ekos Alignment Module enables highly accurate GOTOs to within sub-arcseconds accuracy and can measure and correct polar alignment errors. This is possible thanks to the astrometry.net solver. Ekos begins by capturing an image of a star field, feeding that image to astrometry.net solver, and getting the central coordinates (RA, DEC) of the image. The solver essentially performs a pattern recognition against a catalog of millions of stars. Once the coordinates are determined, the true pointing of the telescope is known. Often, there is a discrepancy between where the telescope thinks it is looking at and where it is truly pointing. The magnitude of this discrepancy can range from a few arcminutes to a couple of degrees. Ekos can then correct the discrepancy by either syncing to the new coordinates, or by slewing the mount to the desired target originally requested.

Furthermore, Ekos can measure the misalignment in the polar axis by taking a couple of images near the meridian and east/west of the meridian. This will enable the user to adjust the mount until the misalignment is minimized.

At minimum, you need a CCD/Webcam and a telescope that supports Slew & Sync commands. Most popular commercial telescope nowadays support such commands.

For the Ekos Alignment Module to work, you have an option of either utilizing the online astrometry.net solver, or the offline solver. The online solver requires no configuration, and depending on your Internet bandwidth, it might take a while to upload and solve the image. The offline solver can be faster and requires no Internet connection. In order to use the offline solver, you must install astrometry.net in addition to the necessary index files. If you are running Ubuntu, you can install it by running the following command:
sudo apt-get install astrometry.net

After astrometry.net is installed, you must download and install the necessary index files suitable for your telescope+CCD field of view (FOV). You need to install index files covering 100% to 10% of your FOV. For example, if your FOV is 60 arcminutes, you need to install index files covering skymarks from 6 arcminutes (10%) to 60 arcminutes (100%). There are many online tools to calculate FOVs, such as Starizona Field of View Calculator.

Index Filename	FOV (arcminutes)	Debian Package
index-4219.fits	1400 - 2000	astrometry-data-4208-4219
index-4218.fits	1000 - 1400
index-4217.fits	680 - 1000
index-4216.fits	480 - 680
index-4215.fits	340 - 480
index-4214.fits	240 - 340
index-4213.fits	170 - 240
index-4212.fits	120 - 170
index-4211.fits	85 - 120
index-4210.fits	60 - 85
index-4209.fits	42 - 60
index-4208.fits	30 - 42
index-4207-*.fits	22 - 30	astrometry-data-4207
index-4206-*.fits	16 - 22	astrometry-data-4206
index-4205-*.fits	11 - 16	astrometry-data-4205
index-4204-*.fits	8 - 11	astrometry-data-4204
index-4203-*.fits	5.6 - 8.0	astrometry-data-4203
index-4202-*.fits	4.0 - 5.6	astrometry-data-4202
index-4201-*.fits	2.8 - 4.0	astrometry-data-4201-1 astrometry-data-4201-2 astrometry-data-4201-3 astrometry-data-4201-4
index-4200-*.fits	2.0 - 2.8	astrometry-data-4200-1 astrometry-data-4200-2 astrometry-data-4200-3 astrometry-data-4200-4

The Debian packages are suitable for any Debian-based distribution (Ubuntu, Mint...etc). If you downloaded the Debian Packages above for your FOV range, you can install them from your favorite package manager, or via the following command:

sudo dpkg -i astrometry-data-*.deb

On the other hand, if you downloaded the FITS index files directly, copy them to /usr/share/astrometry directory.

It is recommended to use a download manager as such DownThemAll! for Firefox to download the Debian packages as browsers' built-in download manager may have problems with download large packages.

Alignment Options

The alignment options are passed to the astrometry.net solver and Ekos each time an image is captured:

• CCD: Select CCD to capture from
• Exposure: Exposure duration in seconds
• Bin X: Set horizontal binning of the CCD
• Bin Y: Set vertical binning of the CCD
• RA: RA coordinates of the search pattern
• DEC: DEC coordinates of the search pattern
• Radius: Radius in degrees of the search pattern
• Options: Options that are passed to the astrometry.net solver. For more details on the options, please refer to astrometry.net
• Update Coordinates After Slew: If checked, it will automatically update the RA & DEC values for the solver search pattern whenever the telescope completes a successful slew/track.
• Preview: If checked, display captured FITS image in FITSViewer tool.
• Verbose: If checked, display detailed information in the logging window.

By default, the solver will search all over the sky to determine the coordinates of the captured image. This can take a lot of time; therefore, in order to speed up the solver, you can restrict it to only search within a specified area in the sky designated by the RA, DEC, and Radius options above. The Solver's RA & DEC coordinates can be updated automatically whenever the mount successfully completely slewing, if the Update Coordinates After Slew is checked. Alternatively, you can use the copy icon to copy the telescope coordinates to the solver options. While the telescope coordinates will certainly differ from the actual target coordinates (unless you are perfectly aligned already!), they are close enough to be utilized properly by the solver.

Alignment Modes

Ekos provides two alignment modes:

GOTO

Using the GOTO mode, Ekos captures and solves an image, and if the solver is successful, it can perform the following actions:

• Sync: Syncs the telescope coordinates to the solution coordinates.
• Slew to Target: Syncs the telescope coordinates to the solution coordinates and then slew to the target.
• Nothing: Just solve the image and display the solution coordinates.

Polar Alignment

Using the Polar Alignment mode, Ekos can measure and correct for polar alignment errors. To measure Azimuth error, point your mount to a star close to the meridian. If you live in the northerm hemisphere, you will point the mount toward the southern meridian. Click on Measure Az Error to begin the process. Ekos will try to measure the drift between two images and calculates the error accordingly. You can ask Ekos to correct Azimuth error by clicking on Correct Az Error button. Ekos will slew to a new location and asks you to adjust the mount's azimuth knobs until the star is in the center of the Field of View. You can use the Focus Module's Framing feature to take a look at the image as you make your adjustments.

Similarly, to measure Altitude error, click on the Measure Alt Error button. You need to point your mount either east or west, and set the Altitude Direction combo box accordingly. Ekos will take two images and calculates the error. You can ask Ekos to correct Altitude error by clicking on the Correct Alt Error button. As with Azimuth correction, Ekos will slew to a new location and asks you to adjust the mount's altitude knobs until the star is in the center of the FOV.

After making a correction, it is recommended to measure the Azimuth and Altitude errors again and gauge the difference. You may need to perform the correction more than once to obtain optimal results.

IOptron IPolar Usage With Mac Computer - Page 4 - Equipment ...

GOTO Workflow

Using Ekos Alignment Module, aligning your mount using the controller's 1, 2, or 3 star alignment is not strictly necessary, though for some mounts it is recommended to perform a rough 1 or 2 star alignment before using Ekos alignment module. If you are using EQMod, you can start using Ekos alignment module right away. A typical workflow for GOTO alignment involves the following steps:

1. Set your mount to its home position (usually the NCP for equatorial mounts)
2. Select Slew to Target in the GOTO options.
3. Check Update Coordinates After Slew in the Plate Solver options.
4. Slew to a nearby bright star
5. After slew is complete, click Capture & Solve

If the solver is successful, Ekos will sync and then slew to the star. You can verify this by capturing an image in the CCD Module. You can repeat this process as needed. For drivers such as EQMod, the more sync points you add to the model, the better the alignment model becomes.

Polar Alignment Workflow

Before starting the Polar Alignment tool, you must complete the GOTO Workflow above for at least one point in the sky. Once your mount is aligned, proceed with the following (assuming you live in the northern hemisphere):

1. Slew to a bright star (4th magnitude or below) near the southern meridian (Azimuth 180). Make sure Slew to Target is selected. Capture and solve. The star should be exactly centered in your CCD field of view.
2. Switch mode to Polar Alignment. Click Measure Az Error. It will ask you to slew to a star at the southern meridian which we already done, click continue. Ekos will now perform the error calculation.
3. If all goes well, the error is displayed in the output boxes. To correct for the error, click Correct Az Error. Ekos will now slew to a different point in the sky, and you will be required to ONLY adjust the mount's azimuth knobs to center the star in the field of view. The most convenient way of monitoring the star field is by going to the Focus module and clicking Start Framing. If the azimuth error is great, the star might not be visible in the CCD field of view, and therefore you have to make blind adjustments (or simply look through the finderscope) until the star enters the CCD FOV.
4. Begin your azimuth adjustments until the bright star you slewed to initially is as close to center as you can get it
5. Stop Framing in the Focus module.
6. Repeat the Measure Az Error to ensure we indeed corrected the error. You might have to run it more than once to ensure the results are valid.
7. Switch mode to GOTO.
8. Now slew to a bright star either on the eastern or western horizon, preferably above 20 degrees altitude. It has to be as close as possible to the eastern (90 azimuth) or western (270) cardinal points.
9. After slew is complete, capture and solve. The star should be dead center in the CCD FOV now.
10. Switch mode to Polar Alignment
11. Click Measure Alt Error. It will ask you to slew to a star at either the eastern (Azimuth 90) or western (Azimuth 270) which we already done, click continue. Ekos will now perform the error calculation.
12. To correct for the error, click Correct Alt Error. Ekos will now slew to a different point in the sky, and you will be required to ONLY adjust the mount's altitude knobs to center the star in the field of view. Start framing as done before in the focus module to help you with the centering.
13. After centering is complete, stop framing.
14. Repeat the Measure Alt Error to ensure we indeed corrected the error. You might have to run it more than once to ensure the results are valid.
15. Polar alignment is now complete!

The mount may slew to a dangerous position and you might risk hitting the tripod and/or other equipment. Carefully monitor the mount's motion. Use at your own risk.

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