BVR photometry of comets 63P/Wild 1 and C/2012 K1 (PANSTARRS)

Abstract

We analyzed the BVR photometry of the comets 63P/Wild 1 and C/2012 K1 (PANSTARRS) obtained between March 2013 and May 2014, with 0.20-m to 2.0-m aperture telescopes installed in Australia, Europa and USA. We have found R-band nuclear magnitudes \(H_{0}=16.3\pm 0.6\) and \(12.52 \pm 0.02\) for 63P and K1 comets. Admitting a geometric albedo equal to 0.04, the nuclei have a radius equal to \(1.5\pm 0.4\) and \(8.67\pm 0.08\) km respectively. Using the Lomb-Scargle periodogram, we found that the most probable periods of rotation of these nuclei are \(14\pm 2\) h and \(9.4 \pm 0.4\) h, with a peak-to-peak light curve amplitude of \(0.85 \pm 0.01\) and \(0.4\pm 0.2\) magnitudes. The inner coma of both comets were probably optically thin and in steady-state during all duration of our observations seasons. The average normalized reflectivity gradient S’ of the coma of 63P and K1 are \(10\pm 15\) (1\(\sigma \)) and \(8\pm 7\) %/100 nm in the spectral range between 440 and 647 nm, which have indicated that both comets are statistically redder than the Sun. The Kruskal–Wallis H-test suggests that the distribution of the color indexes B-V, V-R, and B-R of the objects are similar, indicating some kind of equality between the physical or mineralogical properties of the comas of these comets.

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Notes

  1. 1.

    https://rea-brasil.org/cometas/periodicos.htm#63p.

  2. 2.

    https://rea-brasil.org/cometas/observ12k1.htm.

  3. 3.

    https://www.slooh.com/.

  4. 4.

    https://lco.global/.

  5. 5.

    https://www.itelescope.net/.

  6. 6.

    http://www.astronomie.be/alfons.diepvens/cometimages/comet/photometry/63P-Wild.html.

  7. 7.

    http://www.astronomie.be/alfons.diepvens/cometimages/comet/photometry/C2012-K1-PANSTARRS.html.

  8. 8.

    http://binaries.boulder.swri.edu/binaries/fields/ngc7790.html.

  9. 9.

    http://binaries.boulder.swri.edu/binaries/fields/m67.html.

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Acknowledgements

The authors would like to thank the anonymous reviewer for his/her valuable comments.

This research has used observations made with the LCOGT network, NASA Astrophysics Data System, and data provided by Astrometry.net.

This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

This research made use of Photutils, an Astropy package for detection and photometry of astronomical sources.

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Betzler, A.S., de Sousa, O.F., Diepvens, A. et al. BVR photometry of comets 63P/Wild 1 and C/2012 K1 (PANSTARRS). Astrophys Space Sci 365, 102 (2020). https://doi.org/10.1007/s10509-020-03814-5

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Keywords

  • Comets: individual [63P/Wild 1 C/2012 K1 (PANSTARRS)]
  • Techniques: photometric
  • Methods: data analysis