Re: Would this work for optical sat observation? Raspberry Pi Skycam w/ NoIR V2 Camera and Light Pollution Filter

From: Bill Bard via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 12 Jul 2019 17:01:44 -0400
Found this for an all sky view recorder for a raspberry pi. It’s from 2016 and they mention ASI224MC and ASI120MC cameras and use an Arecont 1.55 wide angle lens.

A whole sky view may not have enough resolution but are the cameras any good?

Bill

> On Jul 11, 2019, at 6:45 PM, C. Bassa via Seesat-l <seesat-l_at_satobs.org> wrote:
> 
> Hi Andreas,
> 
> On Thu, Jul 11, 2019 at 8:08 PM Andreas Hornig via Seesat-l
> <seesat-l_at_satobs.org> wrote:
>> in the last email for our StarLink and NOAA I wrote I did not find any
>> "simple and small budget" solution for optical sat tracking.
>> It turned out I found one on Raspberry Pi and Raspi Cam basis
>> http://shortcircuitsandinfiniteloops.blogspot.com/2017/10/raspberry-pi-skycam-w-noir-v2-camera.html
>> 
>> I would be intrigued to build one, because I, by chance, have a spare
>> Raspi. But before I start I would like to ask a few things:
>> 
>> Do you think the infrared raspi cam described in this article will work to
>> provide usefull obervation for SeeSat-L?
> 
> The noir RPi camera is not sensitive enough for meteor work. I'm
> experimenting with CMOS cameras, in particular the ZWO ASI178MC, and
> that appears to work about as well as a Watec 902H2, though it is
> slightly more expensive. In the meteor community people are looking
> into cheap USB CCTV cameras using the IMX291 and IMX307 chips, but I
> have no experience with those.
> 
>> How do you calibrate them to know the attitude of the FOV?
>> I would attach a simple IMU from aliexpress that measues the magnetic
>> direction and the gravity vector. So I can determine to a certain degree
>> the orientation of the camera towards zenith. And also with the geo
>> position (manual or by gps) I can determine the difference between magnetic
>> north and north.
>> But how "precise" does the calibration need to be? Or how do you do yours
>> with your equipment?
> 
> The astrometric calibration, linking pixel coordinates to sky
> coordinates, needs to be as accurate as it can be. If the camera is
> relatively free of defects you don't even need to know where you point
> as astrometry.net will be able to solve the astrometry for you. If the
> camera and lens combination is also free of distortion, that should be
> precise enough for the astrometric calibration.
> 
> Regards,
>    Cees
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Received on Fri Jul 12 2019 - 16:02:26 UTC

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