[Robin Leadbeater]

The Padova-Asiago classification in TNS was type I   (uncertain – either Ic-BL or Ia). This has now been revised to type Ia based on a spectrum from ZTF (LT/SPRAT)

https://www.wis-tns.org/object/2021hpr

I am just reducing my spectrum taken last night. 

Cheers

Robin

[Robin Leadbeater]

At ~mag 17 last night this was near my limiting magnitude for spectra  but the strong features confirm a type Ia so it should get a fair bit brighter yet. Here is my spectrum compared with a match from SNID

and my spectrograph guider image

[Robin Leadbeater]

The links do indeed now work as intended. (Using “open new window” ensures the reader can visit the links without closing the BAA website tab)

Thanks Dominic!

[Robin Leadbeater]

A comparison of the spectrum from last night with the SOAR Goodman classification spectrum from TNS and described in Atel 14500 taken  2 nights earlier  

[Robin Leadbeater]

The spectrum from last night with some contamination from galaxy lines 

SNID confirms a good fit to a young type Ia several days from maximum

Cheers

Robin

[Robin Leadbeater]

Looking at the details for the object in the GSC, I see it is classed as 3 – “non stellar”
http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ6066f68a1b2892&-out.add=.&-source=I/254/out&GSC=0028800235
so perhaps GSC 00288 00235 was detected in GSC as an area  including the bright knots in the galaxy directly above it with an integrated brightness of mag 12?

[Robin Leadbeater]

Rainer Ehlert has pointed out on the RSpec forum that there is a Mag 12 star GSC 00288 00235 listed at the same position (with an arcsec) but this does not appear in images from DSS,SDSS PanSTARRS and there is certainly nothing that bright there now. (SN2021hiz is definitely a type Ia SN at a  redshift matching UGC 7513)

Could there be an error in the GSC catalogue and  the exact coordinate match a coincidence or is there more to this ? Any ideas ?

Cheers

Robin

[Robin Leadbeater]

Thanks Dominic,

While I have your ear ;-)…   I embedded some links in the description of the image and selected the “new window” option expecting it to open the link in a separate window but it closed the original window. Is this how it should work ?

Cheers

Robin

[Robin Leadbeater]

similarly this one

https://britastro.org/observations/observation.php?id=20201130_172000_14eeb4c49a70db2e

Robin

[Robin Leadbeater]

pinched optics, mirrors with turned edges

[Robin Leadbeater]

Finally got my spectrum a couple of days later. A nice full set of H Balmer and HeI  P Cygni profiles 

Cheers

Robin

[Robin Leadbeater]

For specific targets I like Roger Wesson’s   https://observability.date/     

Robin

[Robin Leadbeater]

Now classified as a type II. Not surprising for a star burst galaxy I guess

https://www.wis-tns.org/astronotes/astronote/2021-93

[Robin Leadbeater]

Argh !   

It was clear last night here too and I was looking round for interesting targets for spectroscopy. This would have shot to the top of the list but nothing on vsnet-alert. Where better should I be monitoring ?

EDIT: I see it is on vsnet-alert.  My brain did not register the alerts for some reason  I think I must have thought Cze was some obscure southern constellation and moved on. 🙁

Cheers
Robin

Cheers

Robin 

[Robin Leadbeater]

Fold over a number of rotations perhaps? (A good test for low read noise CMOS technology)

[Robin Leadbeater]

Does it work using ATIK’s own Artemis Capture ?

https://www.atik-cameras.com/capture-software/

[Robin Leadbeater]

Hi Jack,

To home in on the source of the problem I would check the following

Is the camera installed correctly ? As Tim said, check the Device Manager the camera should be listed under USB somewhere and should report that it is working properly. If not try reinstalling the driver

Once it is installed correctly, try the ATIK capture software. If it is working there then the problem lies with MAXIM DL somewhere.

Cheers

Robin

[Robin Leadbeater]

Then I am stumped I am afraid. If it pops up again you could perhaps try moving the micrometer a touch to see if it moves with the spectrum and/or move the spectrum along the slit a bit to see if it is a localised defect

Robin

[Robin Leadbeater]

Hi Kevin,

I suggest checking your flat image in this area. This double line effect looks typical of that produced by a dust donut. Take a profile across the flat at the location of the spectrum.  I was discussing with Jack Martin the other day who saw something similar (at a different location). It turned out to be a defect visible in  the flat which for some reason we don’t quite understand was not corrected by the flat (The defect was weaker in the flat than in the image)  

Cheers

Robin

[Robin Leadbeater]

I used to work for a Swedish paper company and when discussing aurorae with a colleague who worked in forestry there he commented unprompted on hearing crackling during strong aurorae which I assumed was a local electrostatic effect.  

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