Self-Supervised Clustering on Image-Subtracted Data with Deep-Embedded Self-Organizing Map

no code implementations • 14 Sep 2022 • Y. -L. Mong, K. Ackley, T. L. Killestein, D. K. Galloway, M. Dyer, R. Cutter, M. J. I. Brown, J. Lyman, K. Ulaczyk, D. Steeghs, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, L. Nuttall, E. Palle, D. Pollacco, E. Thrane, S. Awiphan, U. Burhanudin, P. Chote, A. Chrimes, E. Daw, C. Duffy, R. Eyles-Ferris, B. P. Gompertz, T. Heikkila, P. Irawati, M. Kennedy, A. Levan, S. Littlefair, L. Makrygianni, T. Marsh, D. Mata Sanchez, S. Mattila, J. R. Maund, J. McCormac, D. Mkrtichian, J. Mullaney, E. Rol, U. Sawangwit, E. Stanway, R. Starling, P. Strom, S. Tooke, K. Wiersema

The identification of transient detections from the subtraction artifacts after the image differencing process is a key step in such classifiers, known as real-bogus classification problem.

Clustering

Monitoring polarization in comet 46P/Wirtanen

no code implementations • 23 Dec 2020 • M. Zheltobryukhov, E. Zubko, E. Chornaya, I. Luk'yanyk, O. Ivanova, A. Kochergin, G. Kornienko, D. Mkrtichian, S. Poshyachinda, I. E. Molotov, S. S. Kim, G. Videen

While aperture-average polarimetry of 46P/Wirtanen reveals a nearly zero polarization PQ at the lowest phase angle {\alpha} = 18. 1 deg, simultaneous imaging polarimetry suggests that the negative polarization (PQ<0) arises in a region of within 5000 km of the nucleus, where the negative polarization could be as strong as PQ=-(1. 44 +/- 0. 15) percent.

Earth and Planetary Astrophysics