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Optical transient L = 13.4, amplitude ~8.5 mag, possibly a nova as described here: https://www.astronomerstelegram.org/?read=16842
J2000 coordinates RA = 06:50:54.49, Dec = +59:36:24.51
60s exposure in grotty, hazy conditions from Chelmsford tonight (Oct 4) shows it around mag 13.2 unfiltered vs Gaia G.
Attachments:
It’s worth pointing out that the lead author on the ATel is Dr Thomas Killestein: https://tkilleste.in/
Thomas was recipient of the Sir Patrick Moore Prize 2016. I well remember presenting it to him at the 2017 January meeting: https://britastro.org/2017/young-astronomer-awarded-the-2016-sir-patrick-moore-prize
There is a further confirmation here: https://www.astronomerstelegram.org/?read=16847
Also picked up by MASTER yesterday at mag 13.6 (clear)
https://www.wis-tns.org/object/2024xhnThere is another PNV from 4 days ago around the same magnitude with no confirmation as yet
http://www.cbat.eps.harvard.edu/unconf/followups/J06393680+1604070.html
https://www.wis-tns.org/object/2024xdmHi all,
I set my C11 in Spain to image it for a couple of hours early this morning (6th Oct : JD 2460589.588866 – 2460589.697257) and got 132 measurements in an L filter. I used AAVSO chart X38448OQ and V magnitudes to get the attached. Average Vmag was 13.33 and there seems to be a gentle fade (the check star looks flat).
See attached for light curves and also the FOV with comp stars from AstroArt8.
Andy – are we going to add this to our BAA database? I have uploaded to the AAVSO db.
Cheers
Ian.My SLOOH image, taken on Oct 06.1208UT measures at 13.401CV using the AAVSO chart and sequence.
Ian: I’ll be uploading my CCD observations to the BAAVSS database shortly. The software will detect that this is a new object, and will create a new file with the name I upload it with – which is GOTO065054.49+593624.51 I can’t see any alias in VSX, so it will be this long winded nonsense I’m afraid.
Gary
Good to see the data coming in.
I also see an ATel from the ARIES team in India: https://www.astronomerstelegram.org/?read=16847Let’s hope it gets a proper name soon. Good publicity for the GOTO project(Gravitational-wave Optical Transient Observer)
Ian: I’ll be uploading my CCD observations to the BAAVSS database shortly. The software will detect that this is a new object, and will create a new file with the name I upload it with – which is GOTO065054.49+593624.51 I can’t see any alias in VSX, so it will be this long winded nonsense I’m afraid.
Thanks Gary, I’ve successfully uploaded my data now.
Cheers
Ian.Spectroscopy from the GOTO team leads them to suggest this is a WZ Sge type dwarf nova: https://www.astronomerstelegram.org/?read=16858
If so, one might expect superhumps to develop.
An ALPY200 spectrum from 20241010 (with severe auroral line contamination removed) confirms the typical features of a dwarf nova in outburst as described in ATel 16858
Cheers
RobinAttachments:
Tonny Vanmunster reports the emergence of 0.16 mag amplitude humps 13 days into the outburst of this putative UGWZ dwarf nova. The period is ~0.067 days.
Hi all,
I managed a decent run last night from Spain and concur with the ~0.067 day superhumps. See attached.
Cheers
Ian.Attachments:
Thanks Ian. I note that the star dipped (to mag 16) and re-brightened ~4 days ago. Classic UGWZ. I wonder if there will be further such episodes.
A few more spectra, the latest one at higher resolution with the ALPY600 (missed the fade unfortunately)
Cheers
RobinAttachments:
Latest data shows that the rebrightening episode, which lasted ~9 days, is now over with the star having faded to 18th mag. Additional rebrightenings are possible.
Just had a heads up from Tom Killestein. It’s bounced again. mag 15, up from 17.4 this morning
Robin
Preprint now on ArXiv
https://arxiv.org/abs/2501.11524
(Includes some of my spectra taken with ALPY200/600)Cheers
RobinAnd another paper
“Bridging the Gap: OPTICAM Reveals the Hidden Spin of the WZ Sge Star GOTO 065054.49+593624.51”
https://arxiv.org/abs/2501.11669
(Detection of a 148s periodic signal in high cadence photometry)
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