[Aavso-photometry] Toads Campaign nd HV Vir

[Wolfgang Renz]

Hi George

If you positioned the stars at exactly the same location of the
CCD, have you checked if it might be a reflection of the 5.7
mag star ?

Clear skies
 Wolfgang

-- 
Wolfgang Renz, Karlsruhe, Germany
Rz.BAV = WRe.vsnet = RWG.AAVSO



----- Original Message ----- 
From: "Wolfgang Renz" <w_renz at onlinehome.de>
To: "George Sjoberg" <george_sjoberg at yahoo.com>
Cc: "AAVSO-PHOTOMETRY" <aavso-photometry at mira.aavso.org>
Sent: Sunday, May 25, 2008 3:34 PM
Subject: Re: [Aavso-photometry] Toads Campaign nd HV Vir


Hi George

> The table in the alert notice shows a RA of 13:21:03.1,  the chart
> generator for HV Vir shows 13:21:3.1 (which i interpret as 13:21:30.1)
> Which is correct? 

Your interpretation is incorrect. 3.1 is 03.1 and not 30.1.

> More confusing is the fact that on two nights running i find on my
> images a mag 14.6 star where the chart (080520) says HV Vir
> would be. After the first night I didn't report anything because I
> feel am in test mode.  When the same star appeared after last
> nights run I assumed I would find something in recent observations.
> But CMP for May 24 shows a mag less than 17.1 in V (the same
> filter I was shooting thru)  Can someone help me understand what
> my mistake(s) are? I can supply the images if that helps.
> I am using a C14 and an ST8 (NABG)

Was your first run in begin of March ?
At that time it was at ~ 14.5 mag:
http://www.aavso.org/cgi-bin/newql.pl?name=HV%20Vir&output=html

If its not this and HV Vir (or an background star) doesn't show an
outburst, it might be one of those:

How exacly is it the same position ?
Are you sure its not the 14.1 mag comp star ?

Have you already checked at the MPC if it might be a minor planet ?
Did you make more than one image per night ?

Have you checked if it might be a hot pixel/cluster or a cosmic ?
Does it look star-like ?
Is the FWHM and the radial profile similar to a close star of nearly
equal birghtness ?
Is it at the same position of the CCD ?
Does the bias/dark/flat frames show something at the position ?

Clear skies
 Wolfgang

-- 
Wolfgang Renz, Karlsruhe, Germany
Rz.BAV = WRe.vsnet = RWG.AAVSO