[Aavso-photometry] Reality Check - Basic Concepts

[David Trowbridge]

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?