Newest observations
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Lempäälä, Sääksjärvi, Landscape image of a planet
I
19.3.2023 at 20.03 -
Rovaniemi, One halo form
I
19.3.2023 at 16.00 -
Kemijärvi, Several halo forms
II
19.3.2023 at 15.30 -
Kittilä, Several halo forms
II
19.3.2023 at 14.35 -
Pello, Starlink G2-7
I
19.3.2023 at 05.00 -
Tornio, Starlink G2-8
I
19.3.2023 at 04.40 -
Vaasa, A fireball at night, as bright as a full moon
III
19.3.2023 at 00.07 -
Vaasa, A fireball at night, brighter than the venus
III
18.3.2023 at 23.04 -
Peltovuoma, Enontekiö, A fireball at night, as bright as a full moon
III
18.3.2023 at 21.10 -
Muonio, A fireball at night, as bright as a crescent moon
III
18.3.2023 at 21.00 -
Lappeenranta, One halo form
I
18.3.2023 at 11.20 -
Helsinki, One halo form
I
18.3.2023 at 10.30
Contact information
Visibility IV / V
Timo Kantola, Ursa (Itä-Suomi)
Nice comet! From the beginning of the evening I watched with 7x50 binoculars. The comet was easy to find and was visible as a clear oblong haze, although Pieksämäki's LED lighting annoyingly disturbs my observation spot in the northern sky. Next, I applied for a more robust Celestron 76mm f300mm Cometron, which is just the right game for this kind of comet bongaing. With that, the shape of the comet began to take shape, I couldn't make out the tail any worse.
At the beginning of the evening at 22:30 I took a few pictures with the modded Canon 1000D + 135mmF2. Either due to light pollution or the UV filter, I couldn't get an ion tail in the pictures at all. I found C/2022E3 spectrum measurements online, and in the blue at 388nm there is a strong CN emission (Cyanide?) which is cut out with a UV filter. Link to spectrum: ZTFhttps://posts.3cepheids.co.in/wp/category/spectroscopy/comet-spectroscopy/
At night I set the clock to 2:50 and photographed the comet with a 30cmF4 tube, field of view 25.9' x 19.3' The gas tail was visible in the pictures and the 37 min gif animation shows a bit of the life of the tail.
Pictures:
- GIF 27.1. 05:13-05:50
- 3-picture mosaic 27.1. 04:26-04:37
- same as negative
- same gradient map
- tail without comma c2022 E3 ZIF 04:01-04:04
- Cropped color photo experiment with Canon 26.1 22:30
The comet made the biggest impression live with a small tube!
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Onpa upea havainto! Hieno animaatio.
Hienoja havaintoja C/2022 E3:sta Timo ! CN/syaaniradikaali on sähköisesti neutraali molekyyli, joten se ei muodosta ionipyrstöä aurinkotuulen vaikutuksesta. UV-alueella on vahvan CN-emission lisäksi useita emissioviivoja ioneista kuten CO+ ja OH+ jne jotka luonnollisesti leikkautuvat UV-fltterillä pois, lisäksi useat ccd/cmos-kennot ovat hyvin epäherkkiä UV alueella. E3:sen ionipyrstö näkyy aika hyvin näkyvän valon G ja B kanavilla, mm CO+ ja R kanavalla on H2O+ emissioviiva.
Kiitos Jorma, sieltähän tuli ihan professoritason vastaus!
Jos oikein ymmärsin niin uv filtteri ei ole syypää siihen että ionipyrstö ei Canon kuvassa näy, ennemmin valosaaste, jääsumu haittaa kontrastia ja piilottaa pyrstön. Pitäis olla jonkunlainen komeetta filtteri.