Additional Outburst of Comet 29P/Schwassmann-Wachmann 1

ATel #13179; Quanzhi Ye (U. Maryland), Michael S. P. Kelley (U. Maryland), Dennis Bodewits (Auburn U.), on behalf of the Zwicky Transient Facility Collaboration
on 10 Oct 2019; 12:57 UT
Distributed as an Instant Email Notice Comets
Credential Certification: Quanzhi Ye (qye@caltech.edu)

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We report a sudden increase in the brightness of comet 29P/Schwassmann-Wachmann 1, using the images acquired with the Zwicky Transient Facility (ZTF) operated on the 1.2-m Oschin Schmidt telescope at Palomar Observatory (Bellm et al. 2019, PASP, 131, a8002). This event took place between 2019 Oct 7.38 and 8.29 UT, with a brightness increase of 0.37 +/- 0.04 mag. The event is preceded by the possible fragmentation that we reported earlier (ATel #13164). Photometry of the comet in images for the past 7 days, measured with 20,000 km radius apertures and calibrated to the PS1 catalog (Tonry et al. 2012, ApJ, 750, 99), is tabulated below. We assumed median comet color corrections from Solontoi et al. (2010, Icarus, 205, 605) of g-r = 0.49 and r-i = 0.24.

 
Date UT            r mag    dmag band  
===================================== 
2019 Oct. 09.30    15.61    0.02    i 
2019 Oct. 08.29    15.69    0.03    g 
2019 Oct. 07.38    16.06    0.03    g 
2019 Oct. 07.35    16.02    0.02    r 
2019 Oct. 05.40    15.97    0.02    r 
2019 Oct. 05.32    15.97    0.03    i 
2019 Oct. 04.41    16.04    0.03    g 
2019 Oct. 04.37    16.03    0.03    g 
2019 Oct. 04.30    15.96    0.02    r 
2019 Oct. 03.29    15.92    0.02    r 
2019 Oct. 02.40    15.99    0.03    g 

Part of this work makes use of observations obtained with the Samuel Oschin Telescope 48-inch at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW.