RoboPol: A four-channel optical imaging polarimeter

A. N. Ramaprakash, C. V. Rajarshi, H. K. Das, P. Khodade, D. Modi, G. Panopoulou, S. Maharana, D. Blinov, E. Angelakis, C. Casadio, L. Fuhrmann, T. Hovatta, S. Kiehlmann, O. G. King, N. Kylafis, A. Kougentakis, A. Kus, A. Mahabal, A. Marecki, I. MyserlisG. Paterakis, E. Paleologou, I. Liodakis, I. Papadakis, I. Papamastorakis, V. Pavlidou, E. Pazderski, T. J. Pearson, A. C.S. Readhead, P. Reig, A. Słowikowska, K. Tassis, J. A. Zensus

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)
51 Downloads (Pure)


We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, Greece. RoboPol is capable of measuring both relative linear Stokes parameters q and u (and the total intensity I) in one sky exposure. Though primarily used to measure the polarization of point sources in the R band, the instrument features additional filters (B, V, and I), enabling multiwavelength imaging polarimetry over a large field of view (13.6 × 13.6). We demonstrate the accuracy and stability of the instrument throughout its 5 yr of operation. Best performance is achieved within the central region of the field of view and in the R band. For such measurements the systematic uncertainty is below 0.1 per cent in fractional linear polarization, p (0.05 per cent maximum likelihood). Throughout all observing seasons the instrumental polarization varies within 0.1 per cent in p and within ∼1 in polarization angle.

Original languageEnglish
Pages (from-to)2355-2366
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - May 2019
MoE publication typeA1 Journal article-refereed


  • Instrumentation: polarimeters
  • Techniques: polarimetric


Dive into the research topics of 'RoboPol: A four-channel optical imaging polarimeter'. Together they form a unique fingerprint.

Cite this