15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

ALTAIR: Precision Calibration via Artificial Light Sources Above the Atmosphere

20 Jun 2014, 10:00
C-112 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Non-Student) / orale (non-étudiant) Instrumentation and Measurement Physics / Physique des instruments et mesures (DIMP-DPIM) (F1-5) Future of Cosmic Frontier: Dark Matter III and Dark Energy - PPD-DTP / Avenir de la frontière cosmique: matière sombre III et énergie sombre - PPD-DTP


Ms Divya Bhatnagar (University of Victoria) Justin Albert (University of Victoria (CA))


Understanding the properties of dark energy via supernova surveys (and to a large extent other methods as well) requires unprecedented photometric precision. Laboratory and solar photometry and radiometry regularly achieve precisions on the order of parts in ten thousand, but photometric calibration for non-solar astronomical imaging presently remains stuck at the percent or greater level. We present our CSA and NSERC (+ U.S.) sponsored project, ALTAIR, to erase this discrepancy, and current steps toward achieving laboratory-level photometric precision for major sky surveys late this decade. In particular, we show far- and near-field imaging of the balloon-borne light source we presently launch to altitudes of approximately 20 km, and our initial calibration results (in addition to prior work with a present calibrated source in low-Earth orbit). Our technique is additionally applicable to microwave astronomy. Observation of gravitational waves in the polarized CMB will similarly require unprecedented polarimetric and radiometric precision, and we briefly present our plans for a calibrated microwave source above the atmosphere as well.

Primary authors

Dr Arnold Gaertner (NRC (Institute for National Measurement Standards)) Prof. Christopher Stubbs (Harvard University) Ms Divya Bhatnagar (University of Victoria) Justin Albert (University of Victoria (CA)) Dr Karun Thanjavur (University of Victoria) Prof. Keith Vanderlinde (University of Toronto) Matt Dobbs (Department of Physics and Astronomy) Mr Paul Kovacs (University of Toronto) Dr Yorke Brown (Dartmouth College)

Presentation Materials