[Aavso-photometry] Reality Check - Basic Concepts

[Aaron Price]

 When the original announcement was sent (SN#44) we did not have a chart. 
However, one was added shortly after. But then the star did the darndest 
thing and kept getting brighter. So we had to extend the sequence last 
week with new stars on the bright end. 

 With that said, often people observe stars without charts. But they wait 
to reduce the data and submit the observations until the chart is 
available. This is important for transient objects that may not be around 
once a chart is available. 

Aaron



On Wed, Jun 13, 2007 at 06:09:09PM -0700, David Trowbridge wrote:
> But I thought there were no comparison stars in the vacinity of this Nova
> until just a week or so ago when chart 1804-18 was released. Am I wrong? The
> light curve goes back to before the chart, doesn't it?
> 
> David
> 
> -----Original Message-----
> From: Michael Koppelman [mailto:lolife at bitstream.net] 
> Sent: Wednesday, June 13, 2007 5:48 PM
> To: David Trowbridge
> Cc: AAVSO Photometry; Rebecca Jensen-Clem
> Subject: Re: [Aavso-photometry] Reality Check - Basic Concepts
> 
> For this question I would say, no. The common case is people doing  
> differential photometry against comparison stars without transforming  
> the observations.
> 
> For people just getting started (and, in fact, people who have been  
> doing this for a long time) it is by far easier to go differential  
> and untransformed. With well-chosen comparison stars, the error  
> introduced by not transforming is quite minor.
> 
> M.
> http://www.lolife.com/astronomy/
> 
> 
> On Jun 13, 2007, at 5:55 PM, David Trowbridge wrote:
> 
> > Question #1: In general, do the data points in this light curve  
> > represent
> > the results of observers who have been doing all-sky photometry and  
> > using
> > standards such as Landolt, M67, etc?
> 
> 
> 
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-- 

Aaron Price
Technical Assistant, Technology
American Association of Variable Star Observers
www.aavso.org