Comet 21P/Giacobini-Zinner, data from Osservatorio Astrofisico di Asiago (Italy) at 2018.07.17,9. Obs. Paolo Ochner, Schmidt 67/91, filters BVR Johnson, 300s exp. Images: coadding (RGB calibrated), colour indexes (B-V, V-R). Very interesting the shape of the emission in B and V. |
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