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.

C/2006 W3 (Christensen) by Bernhard Haeusler, Germany

2008-11-27 by Bernhard Haeusler, Maidbronn, Germany


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

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

C/2006 W3

2454798.27896

14.245

12.461

15.552

14.888

13.854

12.625

2454798.28111

14.237

12.449

15.567

14.904

13.842

12.618

2454798.28326

14.228

12.455

15.556

14.919

13.843

12.629

2454798.28545

14.243

12.449

15.548

14.908

13.852

12.626

2454798.28760

14.234

12.452

15.576

14.893

13.845

12.610

2454798.28975

14.236

12.454

15.561

14.901

13.847

12.620

2454798.29190

14.244

12.463

15.528

14.923

13.842

12.635

2454798.29405

14.240

12.460

15.558

14.896

13.846

12.656

2454798.29620

14.240

12.463

15.569

14.881

13.847

12.681

2454798.29835

14.232

12.464

15.548

14.904

13.852

12.691

2454798.30050

14.237

12.454

15.542

14.922

13.845

12.677

2454798.30265

14.241

12.469

15.543

14.903

13.844

12.689

2454798.30480

14.231

12.460

15.559

14.904

13.847

12.654

2454798.30695

14.235

12.464

15.533

14.920

13.848

12.653

2454798.30910

14.225

12.463

15.576

14.888

13.848

12.641

2454798.31125

14.242

12.467

15.539

14.906

13.846

12.650

2454798.31341

14.245

12.469

15.529

14.897

13.859

12.655

2454798.31556

14.224

12.453

15.579

14.906

13.837

12.643

2454798.31771

14.232

12.462

15.539

14.917

13.851

12.658

2454798.31987

14.240

12.474

15.549

14.900

13.837

12.662

2454798.32202

14.238

12.470

15.511

14.927

13.854

12.686

2454798.32417

14.235

12.461

15.554

14.905

13.845

12.678

2454798.32632

14.225

12.458

15.560

14.909

13.849

12.688

2454798.32848

14.247

12.466

15.548

14.881

13.859

12.717

2454798.33063

14.230

12.468

15.535

14.922

13.844

12.701

2454798.33278

14.235

12.472

15.534

14.909

13.850

12.705

2454798.33493

14.230

12.465

15.565

14.905

13.835

12.668

2454798.33709

14.221

12.467

15.574

14.888

13.850

12.665

2454798.33924

14.258

12.477

15.504

14.895

13.866

12.641

2454798.34139

14.246

12.457

15.533

14.918

13.846

12.622

2454798.34355

14.241

12.471

15.529

14.902

13.858

12.646

2454798.34570

14.229

12.461

15.550

14.914

13.847

12.636

2454798.34785

14.238

12.458

15.570

14.893

13.840

12.627

2454798.35000

14.243

12.472

15.533

14.908

13.844

12.630

2454798.35215

14.235

12.463

15.565

14.892

13.845

12.625

2454798.35430

14.254

12.469

15.518

14.904

13.854

12.632

2454798.35645

14.236

12.463

15.548

14.904

13.848

12.638

2454798.35861

14.227

12.455

15.566

14.906

13.846

12.623

2454798.36076

14.248

12.466

15.543

14.899

13.844

12.640

2454798.36291

14.229

12.465

15.531

14.915

13.860

12.664

2454798.36506

14.237

12.472

15.537

14.889

13.865

12.643

2454798.36721

14.223

12.449

15.612

14.886

13.831

12.625

2454798.36936

14.227

12.453

15.566

14.907

13.846

12.625

2454798.37151

14.244

12.466

15.555

14.882

13.852

12.628

2454798.37367

14.230

12.465

15.551

14.901

13.852

12.618

2454798.37582

14.220

12.462

15.571

14.912

13.834

12.623

2454798.37798

14.224

12.464

15.551

14.905

13.856

12.626

2454798.38013

14.228

12.458

15.567

14.897

13.850

12.631

2454798.38228

14.229

12.465

15.552

14.900

13.852

12.671

2454798.38443

14.239

12.468

15.546

14.898

13.849

12.691

 

 

 

 

 

 

 

Average

14.236

12.463

15.551

14.903

13.848

12.650

In excel I compute the average values of the object and use the computed value of 12.65 mag for the comet.

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Copyright of all sites and images of this web: Bernhard Haeusler, Rimpar, Germany   MPC code: B82 Maidbronn