Earth, Moon, and Planets

, Volume 122, Issue 1–2, pp 53–71 | Cite as

Photometric Study of Comet C/2014 S2 (PANSTARRS) After the Perihelion

  • A. S. Betzler
  • O. F. de Sousa
  • L. B. S. Betzler


We analyzed the BVR photometry of comet C/2014 S2 obtained between March and June 2016, in observatories installed in Europe and the United States. Using the Lomb–Scargle periodogram, we found that the most probable periodicity deduced from the V-band magnitudes is 2.70 days, suggesting that it is the period of rotation of the nucleus of this comet is \(2.70 \pm 0.07\) days or \(68 \pm 2\) h, with a peak-to-peak light curve amplitude of \(0.4 \pm 0.1\) magnitudes. We verify that the absolute magnitude \(H_0\) and the activity index n differ from each other when they are calculated from the visual or CCD magnitudes. Considering the absolute magnitude \(H_{v0}=\) 6.0, obtained from visual magnitudes, we estimate that the lower limit of nuclear radius is 1.3 km. Analyzing the variation of magnitude R with the photometric aperture, we suggest that the coma of this object was in steady-state within the time limits of our observational interval. The coma had a mean color index B–V\(=0.79\pm 0.22\), which is typical of active comets. Additionally, we have shown that the use of a variable photometric aperture, linked to geocentric distance, is probably unnecessary for the comet PANSTARRS .


Comets: individual [C/2014 S2 (PANSTARRS)] Techniques: photometry Methods: observational 



The authors thank A. Diepvens of the Olmen Observatory (Belgium), the ICQ and the“Fachgruppe Kometen” by kindly disposing on the internet the data of the comet PANSTARRS, and the two anonymous reviewers for their valuable comments on our manuscript. O. F. de Sousa would like to thanks the productive discussions on the Programa de Astronomia no Recôncavo da Bahia (PARB). This research made use of NASA Astrophysics Data System and data provided by 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.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • A. S. Betzler
    • 1
    • 2
  • O. F. de Sousa
    • 3
  • L. B. S. Betzler
    • 3
  1. 1.Centro de Ciência e Tecnologia em Energia e SustentabilidadeUniversidade Federal do Recôncavo da BahiaFeira de SantanaBrazil
  2. 2.Brazilian Meteor Observation Network (BRAMON)NhandearaBrazil
  3. 3.Centro de Formação de ProfessoresUniversidade Federal do Recôncavo da BahiaAmargosaBrazil

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