C/2006 W3 (Christensen) - Photometry


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The Photometry of my comet images is made with MaxIm DL Version 3.22. This program offers a quite good possibility to easily perform the photometry of a series of images.

First I select some reference stars with a magnitude around the comet's mag using TheSky level VI. Only USNO magnitudes are used. The Aperture Radius of the photometry area depends on the size of the inner coma of the comet. In the case of comet C/2006 W3 (Christensen) I select the maximum Aperture of 20. Also the Gap Width is selected to its maximum size of 10. The Annulus Thickness is set to 5, not too much. The stars should have no neighbors around.

Obj1 = comet, Ref1-Ref6 = Stars

C/2006 W3 (Christensen) © by Bernhard Häusler, Germany

© 2008-11-29 by Bernhard Haeusler, Maidbronn, Germany


The result of the photometry made by MaxIm DL is the following graph:

The "curves" are resulting from different wheather conditons during the series of images.

It shows the performed photometry data of all selected reference stars and of the comet. The program is automatically snaping the "moving" comet on all images, no manual work has to be done. Finally I save the data on a .CSV file and load them into an excel sheet.

T (JD)

Ref1

Ref2

Ref3

Ref4

Ref5

Ref6

Obj1

245.480.029.908

10.824

10.901

12.909

13.368

12.892

13.796

12.819

245.480.030.354

10.841

10.914

12.902

13.355

12.888

13.791

12.805

245.480.030.569

10.867

10.932

12.894

13.344

12.881

13.772

12.794

245.480.030.784

10.852

10.917

12.893

13.358

12.883

13.787

12.802

245.480.031.000

10.821

10.891

12.905

13.372

12.899

13.801

12.823

245.480.031.215

10.808

10.873

12.919

13.377

12.903

13.810

12.831

245.480.031.430

10.764

10.835

12.940

13.392

12.927

13.833

12.843

245.480.031.645

10.807

10.861

12.920

13.381

12.904

13.818

12.820

245.480.031.861

10.807

10.860

12.920

13.379

12.906

13.818

12.822

245.480.032.076

10.816

10.872

12.919

13.381

12.901

13.802

12.820

245.480.032.291

10.821

10.887

12.915

13.372

12.895

13.800

12.816

245.480.032.506

10.800

10.867

12.920

13.383

12.908

13.812

12.828

245.480.032.721

10.783

10.846

12.929

13.388

12.917

13.828

12.842

245.480.032.936

10.772

10.819

12.936

13.404

12.926

13.833

12.862

245.480.033.151

10.787

10.846

12.928

13.394

12.916

13.818

12.856

245.480.033.367

10.781

10.822

12.939

13.403

12.922

13.823

12.865

245.480.033.582

10.783

10.824

12.937

13.389

12.926

13.831

12.878

245.480.033.797

10.758

10.780

12.953

13.416

12.940

13.844

12.904

245.480.034.013

10.759

10.796

12.952

13.408

12.933

13.843

12.887

245.480.034.228

10.773

10.814

12.939

13.404

12.926

13.833

12.880

245.480.034.443

10.762

10.805

12.952

13.411

12.925

13.835

12.889

245.480.034.659

10.743

10.758

12.961

13.422

12.944

13.862

12.893

245.480.034.874

10.728

10.733

12.973

13.438

12.956

13.861

12.910

245.480.035.090

10.784

10.830

12.938

13.398

12.917

13.823

12.866

245.480.035.305

10.747

10.760

12.963

13.419

12.945

13.857

12.890

245.480.035.520

10.752

10.779

12.962

13.420

12.939

13.839

12.890

245.480.035.735

10.642

10.611

13.018

13.499

13.008

13.912

12.968

245.480.035.950

10.637

10.609

13.030

13.491

13.011

13.911

12.950

245.480.036.165

10.725

10.737

12.976

13.430

12.960

13.862

12.879

245.480.036.380

10.731

10.756

12.972

13.436

12.948

13.846

12.876

245.480.036.595

10.654

10.648

13.019

13.473

12.993

13.903

12.917

245.480.036.810

10.730

10.745

12.969

13.431

12.952

13.863

12.875

245.480.037.025

10.737

10.766

12.964

13.429

12.940

13.854

12.864

245.480.037.241

10.717

10.725

12.980

13.444

12.959

13.864

12.886

245.480.037.456

10.671

10.664

13.010

13.466

12.987

13.891

12.925

245.480.037.671

10.641

10.627

13.026

13.491

12.998

13.907

12.950

245.480.037.887

10.598

10.569

13.048

13.522

13.027

13.926

12.976

245.480.038.102

10.658

10.637

13.021

13.473

12.999

13.902

12.961

245.480.038.317

10.675

10.684

12.999

13.456

12.977

13.898

12.955

245.480.038.533

10.655

10.633

13.021

13.484

12.998

13.899

12.975

245.480.038.749

10.712

10.719

12.986

13.443

12.964

13.866

12.916

 

 

 

 

 

 

 

 

average

10.749

10.779

12.957

13.418

12.940

13.846

12.878

In excel I compute the average values of the object and use the computed value of 12.88 mag for the comet.

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© Copyright of all sites and images of this web: Bernhard Haeusler, Dettelbach, Germany   IAU code: B82 Maidbronn and K87 Dettelbach Vineyard Observatory