C/2006 W3 (Christensen) - Photometry


[upwards]

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

2008-12-07 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

245.480.826.946

13.739

13.494

14.200

12.099

14.061

12.357

11.994

245.480.827.161

13.735

13.502

14.192

12.092

14.069

12.360

11.994

245.480.827.375

13.789

13.487

14.152

12.084

14.083

12.355

12.000

245.480.827.591

13.741

13.490

14.227

12.095

14.023

12.374

11.993

245.480.827.806

13.775

13.513

14.217

12.078

14.008

12.358

12.010

245.480.828.021

13.755

13.501

14.155

12.097

14.072

12.371

12.001

245.480.828.236

13.750

13.497

14.173

12.111

14.051

12.367

12.009

245.480.828.451

13.741

13.483

14.157

12.132

14.033

12.403

12.007

245.480.828.667

13.747

13.480

14.151

12.139

14.039

12.394

12.014

245.480.828.882

13.754

13.468

14.168

12.123

14.060

12.377

12.021

245.480.829.096

13.752

13.487

14.165

12.129

14.028

12.389

12.026

245.480.829.315

13.754

13.474

14.171

12.133

14.024

12.394

12.029

245.480.829.530

13.725

13.468

14.158

12.156

14.018

12.425

12.019

245.480.829.745

13.711

13.465

14.147

12.163

14.031

12.433

12.027

245.480.829.961

13.720

13.454

14.155

12.171

14.030

12.420

12.006

245.480.830.177

13.713

13.459

14.126

12.181

14.028

12.443

11.985

245.480.830.393

13.723

13.467

14.144

12.148

14.042

12.426

11.988

245.480.830.608

13.719

13.446

14.167

12.156

14.015

12.447

11.953

245.480.830.824

13.715

13.470

14.152

12.142

14.016

12.455

12.025

245.480.831.039

13.729

13.454

14.173

12.124

14.058

12.413

12.012

245.480.831.255

13.734

13.468

14.189

12.108

14.054

12.396

11.961

245.480.831.471

13.751

13.483

14.194

12.105

14.042

12.374

11.932

245.480.831.687

13.729

13.464

14.185

12.125

14.026

12.423

11.909

245.480.831.902

13.732

13.462

14.164

12.139

14.011

12.442

11.902

245.480.832.118

13.751

13.461

14.152

12.123

14.044

12.420

11.913

245.480.832.334

13.738

13.479

14.193

12.124

14.021

12.395

11.892

245.480.832.549

13.715

13.472

14.186

12.134

14.037

12.405

11.887

245.480.832.765

13.719

13.475

14.169

12.136

14.042

12.409

11.907

245.480.832.981

13.754

13.475

14.174

12.121

14.050

12.375

11.872

245.480.833.196

13.727

13.466

14.154

12.120

14.072

12.411

11.890

245.480.833.411

13.710

13.463

14.148

12.148

14.035

12.447

11.879

245.480.833.627

13.752

13.470

14.159

12.124

14.033

12.411

11.904

245.480.833.842

13.738

13.462

14.132

12.151

14.031

12.436

11.937

245.480.834.057

13.721

13.455

14.139

12.150

14.021

12.464

11.942

245.480.834.273

13.701

13.449

14.145

12.155

14.030

12.469

11.905

245.480.834.488

13.720

13.437

14.101

12.153

14.044

12.495

11.887

245.480.834.704

13.747

13.478

14.145

12.100

14.060

12.419

11.980

245.480.834.919

13.720

13.472

14.178

12.117

14.057

12.407

11.952

245.480.835.135

13.710

13.457

14.136

12.142

14.041

12.464

11.931

245.480.835.350

13.698

13.446

14.172

12.170

13.994

12.470

11.927

 

 

 

 

 

 

 

 

Average

13.734

13.471

14.164

12.130

14.038

12.412

11.961

In excel I compute the average values of the object and use the computed value of 11.96 mag for the comet.

[upwards]

 

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