Celestron NexImage Solar System Imager User Guide - Page 13

How long to take Streaming Video, Rotational speed of the planets, File size

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How long to take Streaming Video On first thought you may think that the more frames you record the better. However there are some limitation to the duration of video and the amount of frames you can acquire. Rotational speed of the planets Since the NexImage will combine as many sharp frames as possible to achieve one high quality image, you don't want to take so many images that you start to detect the rotation of the planet. For example, assume that you do not want to take a series of images long enough to detect .25 arc seconds of motion. Then by knowing the rotational period and angular diameter of the planet you will know the maximum time you can take an individual video. On average, the rotational time limit for the following planets at their closest approach would be: Jupiter - 90 seconds, Saturn - 240 seconds, and Mars - 440 seconds. File size Each frame of a high resolution video can equal a large file size. Hundreds of frames can take up much of your hard drive space. For this reason, Registax will only process video up to 1 GB in size. To avoid taking images that are too large or too long, it is recommended that you take images at higher frame rates (15-30 frames per second) in order to capture as many high quality frames as possible. Note: Since file sizes of each video taken can be quite large, it is recommended that you save your video data onto a CD-ROM. This way you can have a library of files stored for processing without filling up your hard drive in the process. 12

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How long to take Streaming Video
On first thought you may think that the more frames you record the better.
However there are some limitation to the duration of video and the amount
of frames you can acquire.
Rotational speed of the planets
Since the NexImage will combine as many sharp frames as possible to achieve
one high quality image, you don’t want to take so many images that you start
to detect the rotation of the planet. For example, assume that you do not want
to take a series of images long enough to detect .25 arc seconds of motion.
Then by knowing the rotational period and angular diameter of the planet you
will know the maximum time you can take an individual video. On average, the
rotational time limit for the following planets at their closest approach would be:
Jupiter – 90 seconds, Saturn – 240 seconds, and Mars – 440 seconds.
File size
Each frame of a high resolution video can equal a large file size. Hundreds of
frames can take up much of your hard drive space. For this reason, Registax
will only process video up to 1 GB in size. To avoid taking images that are too
large or too long, it is recommended that you take images at higher frame rates
(15-30 frames per second) in order to capture as many high quality frames
as possible.
Note:
Since file sizes of each video taken can be quite large, it is
recommended that you save your video data onto a CD-ROM. This way you
can have a library of files stored for processing without filling up your hard
drive in the process.
12