[vsnet-chat 756] Position of V17-NGC5128

["Bruce Sumner" <b.sumner@bom.gov.au>]

Hi all,

Here are a few more thoughts on the position of V17 and its 
companion.

Using the DSS image of NGC5128  it is just possible to isolate 
CoD-42 8389 (the "companion") from the greatly overexposed image 
of the galaxy. Considerable contrast and image adjustement is 
required, but a possible image of the star is measureable. V17 itself 
is not visible on this DSS image (exposed 24 March 1991). 

By using Mati Morel's offsets [vsnet-chat 753] of V17 from 
CoD-42 8389 (+3.6s, -20"), an approximate position of V17 is able
to be obtained. The results of all this are, for Epoch 2000:

	CoD-42 8389	13h 25m 28.08s  -43d 02' 22.3"  (DSS)
	V17			13h 25m 31.7s    -43d 02' 02"     (Mati Morel offsets)

However the Bryant/Thompson chart gives a RA separation of only 
about 2s, which yields the following position for V17, again Epoch 
2000	
	V17			13h 25m 30s	-43d 02' 02"

I hope this discussion does not complicate an already confusing 
issue.

Bruce Sumner
Melbourne

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