[daip] 3C138 in aipsletter

[Amy Mioduszewski]

Eric is correct it has been since the X-band model was created, but will not 
effect your data if it was only used for amp calibration.

Amy

Crystal Brogan wrote:
> Ok, thats what I thought too, but wanted to double check.
> 
> thanks,
> Crystal
> 
> Eric Greisen wrote:
>> Crystal Brogan wrote:
>>> Hi Eric,
>>>
>>> I noticed an entry under "uv-data matters" in the most recent AIPS 
>>> note regarding a 0.25" position error for the 3C138 model image. I 
>>> wondered if you could clarify a couple of things:
>>>
>>> (1) has the model image always had this offset since its original 
>>> creation?
>>>
>>> (2) if you only used 3C138 for flux calibration (with this position 
>>> error) in place, what is the likely magnitude of affect on data?
>>>
>>> Best,
>>> Crystal
>> Amy can answer better than I - if I get this wrong.
>>
>> I think the error has been there a long time - perhaps forever in the X 
>> band model only.
>>
>> But, if you used it for flux only, there should be essentially no error
>> in the calibration.
>>
>> Eric
> 
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