[Aavso-photometry] RE: Aavso-photometry Digest, Vol 16, Issue 8

Wed Mar 16 14:45:56 EST 2005

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Subject: Aavso-photometry Digest, Vol 16, Issue 8

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Today's Topics:

   1. 70 Virginis observations (Richard Miles)
   2. rising supernova (Peter Brown)
   3. RE: rising supernova SN2004am (Jean-Claude PELLE)
   4. Visual-Radio Exoplanet Campaign
      (Shankland, Paul D CDR U.S. Naval Observatory)

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Message: 1
Date: Mon, 7 Mar 2005 19:29:56 -0000
From: "Richard Miles" <rmiles.btee at btinternet.com>
Subject: [Aavso-photometry] 70 Virginis observations
To: <aavso-photometry at aavso.org>
Message-ID: <001e01c5234c$0db24240$70fd9c51 at INSPIRON>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=original

As part of the current exoplanet campaign, I spent some time last night 
imaging the field around 70 Vir using a 6-cm aperture Takahashi FS60C 
refractor + V filter + SXV-H9 CCD camera operated unbinned.  This 
combination has a field size of about 1.0x1.5 deg so in addition to 
recording the closest comparison star (HIP 65749, V=8.58), I was able to 
also register three other 8th magnitude stars (HIP 65644, HIP 65589, and the 
furthest HIP 65534 some 48 arcmin from 70 Vir).

I defocussed the telescope so that the FWHM was increased from about 1 pixel 
to about 4 pixels and used a 5-pixel radius photometric aperture for the 
analysis.  Looking at a sequence of 100 x 5-second exposures made when the 
field was at an altitude of 46 deg, the following was found.

Standard deviation rel. to nearest comparison = 0.021 mag
Same rel. to nearest two 8th mag stars = 0.017 mag
Same rel. to furthest 8th mag stars = 0.016 mag
Same rel. to ensemble of all four 8th mag stars = 0.014 mag

Standard deviation of 4-star ensemble, 10-frame averages = 0.005 mag
Cycle time for 10 x 5-sec frames = 90 sec

One of the aims of the campaign is to identify possible flares of the main 
star, which may then translate (after a delay) in possible auroral activity 
from any orbiting planet, detectable in the radio spectral signature of the 
system.  Flares, if these occur will be significantly more intense in the B 
filter passband than in V.  However from 30 minutes of photometry to the 
above level of precision, no flare was detected in V.

Richard Miles
Golden Hill Obs, Dorset, UK

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Message: 2
Date: Mon, 7 Mar 2005 14:00:02 -0800 (PST)
From: Peter Brown <grbpeter at yahoo.com>
Subject: [Aavso-photometry] rising supernova
To: aavso-photometry at mira.aavso.org
Message-ID: <20050307220003.36048.qmail at web53306.mail.yahoo.com>
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For anyone interested in supernovae, SN2005am is at 14 mag and still rising.  There are images on this Bright Supernovae site:

http://www.rochesterastronomy.org/snimages/

2005am, IAUC 8490 discovered 2005/02/22.733 by R. Martin 
Found in NGC 2811 at R.A. = 09h16m12s.47, Decl. = -16°18'16".0 
Located 17".6 east and 31" north of the center of NGC 2811 (Itagaki Confirmation image) (CSP/LCO image) (Lode Stevens image) (Taurus Hill Obs image) 
Mag 14.0 and rising, Type Ia (CfA spectrum) (References: CBET 112) 

Peter

Peter J. Brown
Pennsylvania State University
Website under construction at:
http://www.personal.psu.edu/users/p/j/pjb932/
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Message: 3
Date: Tue, 8 Mar 2005 03:03:23 -0000
From: "Jean-Claude PELLE" <jcpelle at mail.pf>
Subject: [Aavso-photometry] RE: rising supernova SN2004am
To: <aavso-photometry at mira.aavso.org>
Message-ID: <NEBBKLFHKLAMGKMPPBABOEFPHJAB.jcpelle at mail.pf>
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-----Original Message-----
> ...
> For anyone interested in supernovae, SN2005am is at 14 mag and still rising....
> ...

See also 

http://astrosurf.com/snweb2/2005/05am/05amHome.htm

and a nearby reference field

http://astrosurf.com/snweb2/2005/05am/05amPhot.htm

Jean-Claude PELLE
Southern Stars Observatories

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Message: 4
Date: Tue, 8 Mar 2005 10:57:22 -0500
From: "Shankland, Paul D CDR U.S. Naval Observatory"
	<paul.shankland at navy.mil>
Subject: [Aavso-photometry] Visual-Radio Exoplanet Campaign
To: <aavso-photometry at mira.aavso.org>
Message-ID:
	<653C8E7D21FB654997909E77C691053F442F1F at NAEAWNYDEX21VA.nadsusea.nads.navy.mil>

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Hi all,
I agree with Aaron - nice work Aaron, Tim, Walt, et al! And having done stratospheric photometry through refractors - I agree Aaron - so long as the refractor has a decent response and is flat (most upper ends, APOs), a refractor is immensely 'handy'..

Paul

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End of Aavso-photometry Digest, Vol 16, Issue 8
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