Näyttävyys: III / V
Comet 21P/Giacobini-Zinner is now about 0,4 AU from earth and moving quite fast, about 5' per hour. During observation it was bit low on north-east sky at 25°-30° altitude affected heavily of Helsinki light pollution and some fog. Dust tail length is about 15' to PA 275°.
Image 1 IDAS LPS (Visible light) filter tracking comet 20x45s bin 1x1
Image 2 Semrock CN 387nm/15nm filter tracking comet 20x3min=1h bin 2x2
Image 3 CN gas jets, image processing by CometCIEF and then color gradients with Photoshop. CometCIEF service "Samarasinha, N. H., Martin, M. P., Larson, S. M, 2013. Cometary Coma Image Enhancement Facility, http://www.psi.edu/research/cometimen"
Image 4 GIF Animation of CN gas jets, 4x15 min stacked images