potentially bright supernova in NGC4636

[James Foster]

To: Robin,
RE:"SN 2020ue not SN2020ue"
Nice catch....I also used this SN2020ue designation in the AASVO database submission, and haven't (yet?) been rejected for this. BAA has a more
flexible system...when I try to submit spectra for Alpha Orion, it rejects it in favor of the full star name, which almost always misspell (Betelgeuse).

James

[Robin Leadbeater]

I think with the AAVSO database the object name has to already be in their variable star database (though it might be forgiving over missed spaces)

The BAA database is for any object so if you are the first one to submit a spectrum you can call it what you like (though an official name is obviously preferred.) and register it as a new object, having first checked there are no spectra already under a different name.

Subsequent spectra of the same object can be submitted under a different name but this should be entered as an alias linked to the original object name, not as a new object. That way when either name is searched on, both are found. In the case of Alpha Ori, this is registered with the object name alf Ori and Betelgeuse is registered as an alias to alf Ori . Searching on either brings both spectra up.

Ideally aliases should be picked up and registered as such at submission saving the database manager work tidying up later. With SN 2020ue I noticed that SN 2020ue and SN2020ue were entered as different objects so I changed SN2020ue to being an alias of SN 2020ue ( I am not the database manager but I do have some authority to correct these if I happen to spot them)

Cheers
Robin

[Robin Leadbeater]

Here are all the aliases for alf Ori in the BAA database currently

alf_ori_aliases.png (20.64 KiB) Viewed 2664 times

[James Foster]

I got much better guiding and seeing on SN 2020ue with my Alpy600 with the modified Atik414ex (UV glass CCD cover) last night:

I almost went to sleep because a huge fog-bank came up besides my small hill (elev=148m), but luckly it cleared by the time galaxy NGC 4636
came near meridian. Shot Denebola again for my instrument response curve just prior to shooting 12x7min CCD exposures with the Alpy600
working with the 23micron glass slit. Hard to compare with my older ones as the S/N was so low, but definite changes in the spectrum
compared to a week ago.

James

[Robin Leadbeater]

Nice SNR ! It looks like the explosion velocity has dropped about 700km/s since 19th

sn2020ue_20200119_100-25_528.png (32.91 KiB) Viewed 2616 times

Cheers
Robin

[James Foster]

To: Robin,

RE:"Nice SNR ! It looks like the explosion velocity has dropped about 700km/s since 19th"

Let me know if you want my Isis V5.93 processed .fits file for my 25Jan20 observation to get better RV calcs.

James

[Robin Leadbeater]

Hi James

I got much better guiding and seeing on SN 2020ue with my Alpy600 with the modified Atik414ex (UV glass CCD cover) last night:

Note the lines marked as forbidden lines [OII] are the Telluric molecular bands O2 6869 and H2O 7186
eg
http://www.astrosurf.com/buil/us/vatlas/vega3.gif
http://www.astrosurf.com/buil/us/vatlas/vega4.gif

Cheers
Robin

[Robin Leadbeater]

To: Robin,

RE:"Nice SNR ! It looks like the explosion velocity has dropped about 700km/s since 19th"

Let me know if you want my Isis V5.93 processed .fits file for my 25Jan20 observation to get better RV calcs.

James

Hi James, I already picked it up from the BAA database (Thanks for adding it !) There should have been a graphic with that post which went astray somewhere. (now added back in) Here it is again. It shows your spectrum compared with mine from 2020-01-19 red shifted by 700km/s to approximately match. (The actual velocity depends slightly on the line being looked at as we see to different depths. The main effect with time is that we are seeing deeper into the ejected material to lower velocity material as it thins out.)

sn2020ue_20200119_100-25_528.png (32.91 KiB) Viewed 2618 times

Cheers
Robin

[James Foster]

To: Robin,

RE:"Hi James, I already picked it up from the BAA database (Thanks for adding it !)"

Nice that you were able to get it from BAA. Seems were the only ones watching this here, BAA, and AASVO.
I started last week to take IRVB photometry on it with my C-11 at F/6.3 since unlike most SN, its fairly far away from the stellar nucleus of the galaxy.

When I get one or two more nights of images I'll upload the photometry to AASVO and present it here.

James

[Robin Leadbeater]

I started last week to take IRVB photometry on it with my C-11 at F/6.3

That will be useful. The day of maximum in B is a key point. With a spectrum near then we can measure various characteristics
viewtopic.php?f=38&t=2308&start=40#p12716

Cheers
Robin