CARA: Cometary ARchive for Afrho


News of different types

C/2019 Y4 (ATLAS: a double comet with fragments

C/2019 Y4 (ATLAS): a split comet


Evolution of C/2019 Y4 fragmentation

Images taken with the 80 cm f/4 telescope of the Celado Observatory (Italy) -  Giancarlo Favero and Mauro Facchini

C/2019 Y4 ATLAS

Comet C/2019 Y4 ATLAS, 2020/04/07 UT21:30


The rising and fading of comet C/2019 Y4 (ATLAS)



38P Af[rho] plot

A preliminary analysis of the last year apparition of comet 38P/Stephan - Oterma shows that the peak of activity was about 25 days before perihelion

Published the latest revision of Winafrho manual

The latest Winafrho User Manual has been published
By Cavezzo Observatory

A small amplitude ouburst on comet 64P/Swift-Gehrels

On January 2 and 3 a small outburst was observed By Erik Bryssinck on comet 64P/Swift-Gehrels.  Despite the small amplitude  of the event it's trace is evident in the changing of the coma morphology. The Af[rho] quantity increased from about 160 cm to 290 cm in R band for measuring windows between 5,000 and 10,000 km. Below the images and plots made by Erik Bryssinck.

  64P Jan 2, 2019

Comets 46P/Wirtanen and 64P/Swift-Gehrels update

In this period comets 46P/Wirtanen and 64P/Swift-Gehrels are among the more interresting objects. The enclosed plots have been updated by Erik Bryssinck and show the behavior of the two comets reporting the Af[rho] quantity vs. days from perihelion.

The observers that are contributing to the observing campaigns are listed below in alphabetical order.  The data for 46P have been normalised for a zero phase angle while for 64P have been used the observed values.

Comets 21P/Giacobini-Zinner and 46P/Wirtanen

The recent apparitions of periodic comets 21P/Giacobini-Zinner and 46P/Wirtanen have been intensively monitored.  The analysis and the enclosed plots made by Erik Bryssinck well show the preliminary results on the two objects. Comet 21P displayed a regular curve peaking about 18 days before perihelion in agreement with the 1998 apparition (Lara et al, A&A 399- 2003).



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