304P/Ory - 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 P/2008 Q2 (Ory) I select the maximum Aperture of 6. 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.

P/2008 Q2 (Ory) � by Bernhard Haeusler, Germany

Ref1-7 = stars, Obj1 = comet

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

Ref6

Ref7

Obj1

245.479.846.344

14.647

16.273

16.202

15.782

16.346

16.320

16.589

16.201

245.479.846.559

14.651

16.303

16.170

15.782

16.419

16.319

16.515

16.184

245.479.846.774

14.648

16.344

16.239

15.764

16.328

16.315

16.523

16.222

245.479.846.989

14.662

16.330

16.226

15.765

16.328

16.329

16.521

16.237

245.479.847.204

14.656

16.313

16.229

15.784

16.305

16.314

16.558

16.166

245.479.847.431

14.650

16.293

16.234

15.792

16.313

16.344

16.534

16.203

245.479.847.646

14.649

16.271

16.229

15.776

16.374

16.326

16.535

16.233

245.479.847.861

14.650

16.295

16.240

15.773

16.370

16.301

16.530

16.216

245.479.848.075

14.659

16.292

16.215

15.786

16.358

16.323

16.527

16.202

245.479.848.290

14.650

16.318

16.251

15.762

16.362

16.313

16.502

16.231

245.479.848.505

14.659

16.292

16.219

15.765

16.359

16.316

16.550

16.215

245.479.848.720

14.653

16.301

16.212

15.778

16.361

16.334

16.521

16.235

245.479.848.935

14.647

16.320

16.229

15.788

16.349

16.323

16.504

16.191

245.479.849.149

14.666

16.290

16.194

15.795

16.375

16.319

16.521

16.235

245.479.849.364

14.654

16.291

16.228

15.776

16.339

16.329

16.542

16.228

245.479.849.579

14.652

16.281

16.243

15.767

16.343

16.324

16.549

16.209

245.479.849.794

14.662

16.268

16.247

15.783

16.356

16.307

16.536

16.206

245.479.850.009

14.656

16.290

16.227

15.776

16.369

16.331

16.512

16.223

245.479.850.223

14.658

16.295

16.215

15.784

16.376

16.297

16.535

16.270

245.479.850.438

14.652

16.295

16.215

15.779

16.347

16.313

16.559

16.236

245.479.850.653

14.668

16.302

16.203

15.780

16.377

16.310

16.519

16.219

245.479.850.867

14.658

16.297

16.227

15.778

16.329

16.310

16.561

16.231

245.479.851.082

14.663

16.283

16.233

15.780

16.379

16.294

16.528

16.227

245.479.851.297

14.648

16.286

16.224

15.763

16.370

16.319

16.549

16.219

245.479.851.512

14.657

16.277

16.217

15.771

16.365

16.315

16.558

16.216

245.479.851.726

14.649

16.289

16.218

15.786

16.398

16.318

16.503

16.235

245.479.851.941

14.662

16.282

16.213

15.775

16.390

16.313

16.525

16.273

245.479.852.156

14.642

16.279

16.213

15.764

16.377

16.303

16.582

16.207

245.479.852.370

14.650

16.301

16.221

15.775

16.358

16.316

16.539

16.230

245.479.852.585

14.662

16.292

16.217

15.763

16.343

16.346

16.537

16.265

245.479.852.799

14.644

16.294

16.232

15.755

16.356

16.332

16.546

16.258

245.479.853.014

14.640

16.305

16.212

15.761

16.389

16.319

16.533

16.230

245.479.853.229

14.656

16.291

16.215

15.771

16.369

16.344

16.515

16.242

245.479.853.444

14.647

16.295

16.204

15.780

16.400

16.317

16.516

16.257

245.479.853.659

14.634

16.276

16.252

15.781

16.363

16.317

16.537

16.227

245.479.853.873

14.637

16.316

16.224

15.795

16.366

16.294

16.528

16.211

245.479.854.088

14.643

16.296

16.238

15.770

16.355

16.310

16.549

16.241

245.479.854.303

14.637

16.266

16.243

15.770

16.352

16.331

16.560

16.255

245.479.854.517

14.627

16.354

16.215

15.782

16.379

16.298

16.506

16.239

245.479.854.732

14.629

16.317

16.194

15.775

16.361

16.358

16.525

16.294

245.479.854.947

14.650

16.337

16.172

15.768

16.375

16.298

16.560

16.234

245.479.855.161

14.632

16.346

16.213

15.777

16.341

16.330

16.522

16.270

245.479.855.376

14.646

16.297

16.232

15.814

16.330

16.310

16.532

16.246

245.479.855.591

14.650

16.329

16.217

15.752

16.340

16.313

16.560

16.264

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

16.230

 

In excel I compute the average values of the object and use the computed value of 16.230 mag for the comet.

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Copyright: The author of NEO Planner and all sites of this web is Bernhard Haeusler, Dettelbach, Germany, all rights reserved