Calibration Standards

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Submitted by bkloppenborg on 20 February 2010

Below we include a set of useful calibrators for DSLR photometry on epsilon Aurigae.  These values come from Homogeneous Means in the UBV System (Mermilliod 1991).  Values were obtained through VizieR using the II/168 catalog.
Variable Stars:

Star HD RA DEC (B-V) Cat
eps Aur 31964 75.49223 43.82331 0.540

Comparision Stars (see chart below for AAVSO ID references).

Star AAVSO HD RA DEC V Cat (B-V) Cat

eta Aur

32

32630

76.62872

41.23447

3.172

-0.178

zet Aur *

38

32068 

75.61953

41.07584

3.755

1.224

lam Aur

47

34411

79.78531

40.09905

4.705

0.624

5 Aur

60

31761

75.07641

39.39470

5.960

0.410

ome Aur

50

31647

74.81421

37.89024

4.952

0.040

rho Aur

 

34759

80.45173

41.80457

5.218

-0.149

mu Aur

 

33641

78.35716

38.4845

4.851

0.187

sig Aur

50

35186

81.16309

37.38535

5.010

1.416

58 Per

43

29095

69.17262

41.26481

4.255

1.225

the Aur

26**

40312

89.93028

37.21258

2.645

-0.081

* NOTE: Zeta Aur is itself an eclipsing binary star.  Be aware of it's eclipses or use it with two or more comparison stars.
** NOTE: The Aur is a preferred standard for visual observers.  Please see this reference chart for it's location.

Star Charts:

To assist you in finding the stars in the images, you may either use the AAVSO star chart (image below), or a downloadable PDF document that uses a real DSLR image.

DSLR Chart:

This document was created by bikeman as part of the DSLR Documentation and Reduction team.  Download the PDF copy from here.

AAVSO Chart:

Categories:
B-V for Omega Aur

Ibelieve that the B-V you have listed for Omega Aurigae has a typo. According to the calibration standards page, B-V is listed as 0.400. When Ilook at the star in the catalog from VizieR: http://cdsarc.u-strasbg.fr/viz-bin/nph-Cat//txt?II%2F168/ubvmeans.dat LID: 0100031647 The magnitude is listed as 4.952 and B-Vis listed as +0.040. -Mike Durkin

Typo indeed, corrected now.

Mike, You are correct. I've updated the standard star list above. Thanks for double-checking! Brian

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