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Old 28-05-2024, 12:47 PM
foc (Ross)
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12P Pons Brook from Canberra with Spectrum

In Canberra in the last year or two, it seems when we are not getting the Eastern mist from Sydney, we instead suffer cloud funneling along the Dividing range either from the North or South! Hope it improves as Saturn rises earlier.

But we often get a bit of sun in the day so I can do some solar imaging and some clearish sky in the early night which in this instance I used for comets.

Micks Pons Brook image from a few nights ago inspired me to post up my own taken on a 533mc with a C6 and Celestron reducer. This shows what I am told is an anti-tail at the front.


Also, in case it was of interest added a very novice comet spectrum using the Star Analyzer 100 with my 533mm.
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Click for full-size image (Pons Brook 19 May with all comet lines Calibs 6 w Celestron Rdcr 13 May 24.jpg)
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Click for full-size image (12P_Pons_Brook_C6_CelrR_20_mins_IIS APP_comet_mode_oriented_26_May_2024-Luminance-session_2-crop.jpg)
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Old 28-05-2024, 12:52 PM
foc (Ross)
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And another comet

With the same C6 gear, and also imaged on 26 May here is Tsuchinchan- Atlas 2023 which is of possibly more interest as while now about 10th magnitude, it is higher, coming our way and getting brighter
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Click for full-size image (Tschu Atlas 2023_C6_CelrR_48_mins_APP_ ISS comet_stck_mode_26_May_2024-Luminance-session_1-St.jpg)
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Old 28-05-2024, 01:04 PM
Mickoid (Michael)
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Thanks Ross for showing these images, the graph is a bit beyond my knowledge on spectrographs but I'm sure others more intelligent than me will make sense of it. Thanks for confirming that my lens wasn't playing tricks with me and that the anti-tail out the front is real. Very interesting.
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Old 28-05-2024, 02:23 PM
foc (Ross)
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Hi Michael,

Yes I had the same reaction when I first saw the anti-tail myself. But it even shows up faintly in an earlier Seestar image. I am very novice in Spectroscopy but I know there are some quite experienced members here.
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Old 30-05-2024, 12:23 AM
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astronobob (Bob)
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Fascinating results Ross
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