Junior Job: Investigate NEOs

[Jasem Mutlaq]

Hi Valentin,

Yes that could be a good compromise. I knew the file was pretty large, but
I think we should introduce an option to set the magnitude and warn the
users that file size can be quite large beyond a certain magnitude. We
should have the default as a sane value for us. Looking forward to the
patch.

Regards,
Jasem


On Sat, Mar 18, 2017 at 5:29 AM, Valentin Boettcher <valentin at boettcher.cf>
wrote:

> Edit:
>
> An option would be to perform a separate query for the NEOs with the
> parameters c1_item=Ag&c1_op==&c1_value=Y. The resulting CSV is 539K big and
> could be appended to the asteroids file. I will implement a patch for that.
>
> I alter the first query, so that no NEOs are returned to avoid dublication.
>
> Cheers.
> On 03/18/2017 02:37 PM, Valentin Boettcher wrote:
>
> Hello all.
>
> I've just got into KStars development and took on the junior job
> "Investigate NEOs".
>
> Here are my results:
>
> I've constructed a request to JPL myself and got out a csv of several
> hundred megabytes, which is certainly not suitable for KStars.
>
> Looking at the differences between my query and the one in KStars, I found
> some extra parameters, which had not been included in my one: c1_item=Ai
> and c1_op=%3C and c1_value=12.
>
> That basicly means, that JPL filters the asteroids for the ones which have
> an parameter 'H' (absolute magnitude) smaller than 12, which means that
> they are 'visible'.
>
> The asteroid (2003 YT1) with an absolute magnitude of 16.2 doesn't mach
> the criteria and is not included in the download.
>
> The parameter can't be set much higher, because the file size of the
> download would increase rapidly and slow down KStars. I tested a magnitude
> of 17 with a file size of a bit over 78 megabyte and my laptop struggled.
>
> One/I could maybe implement a setting for the absolute magnitude filter,
> to leave it to the user.
>
> I am looking forward to feedback! (Maybe I haven't understood it...)
>
> Cheers and Thanks!
>
> Valentin Boettcher (hiro, hiro98)
>
>
> P.S. Here is a screenshot with 2003 YT1 :). KStars crashed after a while...
>
>
>


-- 
Best Regards,
Jasem Mutlaq
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