Toward astrometric calibration of ultrawide‐field images. Issue 5 (10th September 2018)

• Record Type: Journal Article
• Authors: Bednar, J.; Skala, P.; Pata, P.
• Other Names: Hudec R. guestEditor.; Urban M. guestEditor.; Nentvich O. guestEditor.
• Is Part Of: Astronomische Nachrichten. Volume 339:Issue 5(2018)
• Page Start: 403
• Page End: 407
• Publication Date: 2018-09-10
• Subjects: astrometry -- catalogs -- techniques: Image processing; Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.201813514
• Languages: English
• ISSNs: 0004-6337

Abstract

Abstract : In this paper, we introduce a new method of astrometric calibration tailored especially for ultrawide‐field systems like WILLIAM. The standard astrometric solution often fails to provide any result if the processed image contains a large amount of distortion, such as from a fisheye lens. Some algorithms yield the result, but the accuracy is satisfactory only at the center of the field of view. This work analyzes such images and proposes a new method that leads to much higher accuracy and success ratio of the calibration.