[APBeta] Double stars

[Paul Rodman]

On Dec 14, 2008, at 05:11 PM, David Crum wrote:

> Yes Paul, that is exactly what I was seeing.
>
> So which catalog should I (or not be) using??

Well, this is a problem that is not easily resolvable, without a major  
rethinking of the way catalogues are managed. I was hoping to attack  
it for V2, but it proved to be too nasty. It would also mean that the  
V1 catalogue files would (probably) not be forward compatible with V2,  
which was a problem. There is no simple workaround, apart from only  
using catalogues with similar coordinate accuracy for both plan  
objects and FOV display.

There are some tricks to avoiding the duplicate objects in the  
display, but none of them is guaranteed to work under all conditions.

> Also, any luck on the other  AP template files??

Nope. I can't reproduce the problem on the Mac. I suspect that it's a  
timing/threading/event problem in Windows, but currently I can't even  
get the app to work there without hard crashing on launch. This is  
very discouraging.

Paul R.

>
>
> Dave
>
> On Sun, Dec 14, 2008 at 5:29 PM, Paul Rodman <paul at ilanga.com> wrote:
>>
>> On Nov 27, 2008, at 04:02 AM, David Crum wrote:
>>
>>> Working with version 2.0b5 and Double stars, I am seeing "double".
>>>
>>> I start up a new session, select Search Catalogs, I choose the AL
>>> Double star one.  I then hit the "ok" button (selecting all
>>> constellations).  I then add all the objects found to the plan.   
>>> Once
>>> they are in the plan I sort it to the way I want it.
>>>
>>> I go to Beta Cygni (Alberio).  When I go to Field of View, things  
>>> get
>>> a bit fuzzy.  There are now 4 stars in the field.  Alberio and  
>>> ALDS85
>>> AND another copy of Alberio and ALDS85.
>>>
>>> This happens on every double star I tried it on in the AL Double  
>>> star
>>> catalog.
>>>
>>> I also tested this out on the Neglected Doubles I catalog, same  
>>> result.
>>>
>>> Do I have more then one catalog selected??
>>
>> Is what is shown below what you are seeing?
>>
>>
>>
>>
>>
>> This occurs because the coordinates in the AL Double Star catalogue  
>> are not
>> particularly accurate (RA and Dec only to the nearest arcmin or  
>> worse),
>> whereas the stars in the Bright Star catalogue (which is selected  
>> here) are
>> more accurate. The difference you're seeing is the difference  
>> between those
>> two catalogues.
>>
>> Paul R.
>>
>>
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>>
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