SN 2019np

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oopfan
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SN 2019np

Post by oopfan » Sun Feb 10, 2019 6:23 am

Supernova SN 2019np
Last reported magnitude at AAVSO: 13.846

William Optics 71mm f/5.9
Altair 290M camera (uncooled)
Optolong Luminance
Unitron Model 142 GEM
Passive tracking with PEC
No active guiding

Gain 200 (1.74 e-/ADU, FWD: 7100e-, Read Noise: 1.55e-)
Offset: 25 ADU
Exposure: 25s
Camera rotation: 5 deg E of N

Lum: 150 frames
Flats: 100 frames
Darks: 20 frames
Bias: 100 frames

Total integration time: 62 minutes

SharpCap 3.1.5219
APP 1.071

Turbulent atmosphere
Attachments
NGC-3254_SN-2019np_annotated_2019-02-10.jpg
NGC-3254_SN-2019np_annotated_2019-02-10.jpg (510.33 KiB) Viewed 320 times

nexusjeep
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Re: SN 2019np

Post by nexusjeep » Sun Feb 10, 2019 10:04 am

Nice capture at least we can see other peoples images who can get out it's currently blowing a gale here and lashing down but allegedly the forecast for the end of the week is looking promising.

Cheers
Nick

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turfpit
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Re: SN 2019np

Post by turfpit » Sun Feb 10, 2019 12:43 pm

Brian

Interesting - where do you get these from? Thanks for the comprehensive capture details - most useful.

I found some detailed info here http://www.rochesterastronomy.org/supernova.html.

Dave

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oopfan
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Re: SN 2019np

Post by oopfan » Sun Feb 10, 2019 3:22 pm

Thanks, everyone.

One of the perks of joining AAVSO: email notification of events.

Last night I noticed after posting that there appeared to be an artifact in the image that looked like a hair. I scrutinized all 150 lights this morning and discovered three frames that have cosmic rays. I removed those frames and restacked. Furthermore I decided to discard the worst 20% during integration based on each image's quality score. Now the total integration time is reduced from 62 minutes to 49 minutes but to me the image only looks better.

I've also attached an inverted image that is more practical for seeing fine details.

Brian
Attachments
NGC-3254_SN-2019np_49m_denoise_invert_2019-02-10.jpg
NGC-3254_SN-2019np_49m_denoise_invert_2019-02-10.jpg (293.5 KiB) Viewed 302 times
NGC-3254_SN-2019np_49m_denoise_2019-02-10.jpg
NGC-3254_SN-2019np_49m_denoise_2019-02-10.jpg (293.48 KiB) Viewed 302 times

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