[vsnet-chat 4407] Re: ac2000

[Fraser Farrell <fraser@trilobytes.com.au>]

> Hi,does anyone know what astrosoftware can take the AC2000 CD from USNO ?

Hans,

Versions 6 and 7 of Guide can make use of this CD. As described on the 
extra features page of the Guide website 
(www.projectpluto.com/extras.htm):


- - - - [begin quote] - - - -

The USNO AC 2000.0 CD-ROM contains positions for 4,621,836 stars, from 
the Astrographic Catalog. As described at the above link, the dataset is 
available on CD at no charge.
 
You can display this data in Guide 6.0 or 7.0, as a user-added dataset, 
using this AC2000.TDF file [http://vsnet.projectpluto.com/ac2000.tdf]. 

Put this file in your Guide directory. Using the AC 2000 is a little 
clumsier than is the case with most of the user-added datasets on this 
page, for two reasons. 

First, you'll have to copy the AC 2000 (or the declination zones you 
want) from the AC 2000 CD-ROM, to somewhere on your hard drive. There's 
no provision for swapping CDs. So unless you have two CD-ROM drives (or 
possibly a CD-ROM changer), you'll have to copy over the data. 

Once you've done this, edit AC2000.TDF. You'll notice that the files are 
assumed to be in the J:\DATA directory, with lines such as this:

file j:\data\ac_p50.dat 

Alter the path accordingly, and you should be ready to go. 

At this point, you run into the second minor annoyance with AC 2000: it 
is broken up into fourteen bands in declination. Use the "Extras... 
Toggle User Datasets" option, and you'll be confronted, not with one "AC 
2000" dataset, but fourteen small datasets, each toggled separately. 

- - - - [end quote] - - - -




cheers,
Fraser Farrell

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