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SN 2021rhu: Bright Supernova in NGC 7814 (Caldwell 43)


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Made some comparison/finder charts using the AAVSO Variable Star Plotter

3 deg FOV, orientation as in RACI finder

X26752KT.thumb.png.ac855b183a0e11c05665f50e687123ca.png

1 deg FOV, orientation as in SCT with diagonal

X26752KV.thumb.png.ace0859a62f0a45fc2a96e74cd1b08d9.png

same, with SDSS image overlaid

X26752KX.thumb.png.6068d32d84397563f53752eb18474bbb.png

As can be seen, the SN is really close to the core

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I'm looking forward to having a look at this but, as clear and blue as the sky has been here today, it won't be tonight that I try. The clouds are due to roll in before midnight :(

The weekend looks promising though just before the Moon starts getting in the way!

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The issue for me is that Pegasus does not clear the surrounding houses / trees until the early hours. Can't do a really late one tonight (though it is clear) so I'll hope the SN stays observable for a few days.

 

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7 hours ago, John said:

The issue for me is that Pegasus does not clear the surrounding houses / trees until the early hours. Can't do a really late one tonight (though it is clear) so I'll hope the SN stays observable for a few days.

 

They can last months., so fingers crossed 

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Thanks Michael for the 'heads up'. Checking back I observed this galaxy in 2008, 2010 and 2011 so a revisit is called for. Unfortunately it does not rise high enough until the early hours so hopefully I will catch the SN.

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I managed to observe this last night. It seemed brighter than mag 12.8 initially and I started to doubt I was seeing it. I did some testing on nearby stars of similar mag and decided it was about right. Very close to the centre of the host galaxy which gave a nice ghostly glow. Many thanks to@michael.h.f.wilkinson for the heads up. 

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1 hour ago, Mark at Beaufort said:

Well done Neil I really must try and stay awake. Unfortunately it takes awhile for this galaxy to clear my rooftop.

 

 

Thanks Mark. It was only just above the rooftops when I caught it last night. It was around 00:40 so it’s bright enough that you don’t need it to get really high in the sky. 

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2 hours ago, Mark at Beaufort said:

Well done Neil I really must try and stay awake. Unfortunately it takes awhile for this galaxy to clear my rooftop.

 

 

Well done indeed Neil :thumbright:

I have a similar problem to Mark - that corner of the square of Pegasus is visible for a while but it's low down at that point and affected by the Bristol light pollution, then it is behind conifers for a good 2-3 hours before being visible again, and better positioned for finding a galaxy of course :rolleyes2:

It sounds a good SN though - worth some effort :icon_biggrin:

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Had a shot tonight.. had to wait until 02:30-ish before it rises over the house, so the sky was getting light again. Some high clouds were threatening too.

The galaxy NGC7814 was barely visible with averted vision. I really need to try this with a dark sky. Les' photo tied-in with Sky Safari and really helped locate it.

As I (avertedly) watched, a very faint point of light was popping in and out, at the centre of the galaxy. I think that was it, but can't be certain. No way I can try to estimate magnitude.

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Here is my effort in capturing this supernova from this morning:

21 x 30 sec   250PDS Newt, ASI178 camera  Optolong L Pro Filter

It's easy to lose the SN in the galaxy's core by pushing to get more detail in the outer galaxy. So the galaxy remains subdued!

377666904_SN2021rhuNGC7814.thumb.jpg.af22b5863e890c02d2796887836f89be.jpg

Edited by Paul M
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2 hours ago, Paul M said:

Here is my effort in capturing this supernova from this morning:

21 x 30 sec   250PDS Newt, ASI178 camera  Optolong L Pro Filter

It's easy to lose the SN in the galaxy's core by pushing to get more detail in the outer galaxy. So the galaxy remains subdued!

377666904_SN2021rhuNGC7814.thumb.jpg.af22b5863e890c02d2796887836f89be.jpg

Looks great, Paul :) 

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Here is one hour of Lum integration from last night, taken with Esprit 150/ASI 178. The object was very low down for me  but the SN is still quite distinct through the murk.

SN2021rhu_Lum_2x2_20x3mins-Luminance-session_1_session_2.thumb.jpg.fc100a55f6f26976ddb99db64500f6b7.jpg

 

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My effort from this morning with v poor seeing conditions. At least managed to grab the SN although C43 is virtualy lost to view in comparison with the image from 17th July.

Regards to all,

Les

IMG_7123 C43 & SN 2021rhu.jpg

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