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Patrick Schmeer has just posted this message on the BAA VSS Alert email system:
TCP J18573095+1653396 = ZTF19aasfsjq (N:)
(submitted to VSX)Discovered on 2021 June 12.537 UT at mag. 8.4 by Seiji Ueda (Kushiro, Hokkaido, Japan):
http://www.cbat.eps.harvard.edu/unconf/followups/J18573095+1653396.htmlZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF19aasfsjq/Possibly recorded on the rise (gmag. ~16.3 on June 12.192 UT) by the ASAS-SN Sky Patrol:
https://asas-sn.osu.edu/sky-patrol/coordinate/a611fda3-59f1-42fd-8e6d-386b21100256Source No. 4514092717838547584 in Gaia EDR3 (Gmag. 19.95).
Spectroscopy and multiband photometry are urgently required.
Clear skies,
Patrick
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References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
– Shappee et al., 2014ApJ…788…48S
– Kochanek et al., 2017PASP..129j4502K
Lasair:
– Smith et al., 2019RNAAS…3…26S
Zwicky Transient Facility (ZTF):
– Masci et al., 2019PASP..131a8003MLatest on CBAT transients page:
2021 06 12.642 – Visually confirmed this nova suspect at reported position. Magnitude 6.4 at June 12.642 UT.
2021 06 12.642 -Visual observation on June 12.642 UT by Andrew Pearce (Nedlands, W.Australia)
Observed with 10x50B and a 5 degree chart drawn with VSP using the 61 star, I get 6.2 on June 12 at 22h 06m UT.
Gary
Here is a photo just taken from Walmer, Kent. A 20 second exposure with a FujiFilm X-T10 and kit lens at 3200 ISO.
Intriguingly a low resolution Star Analyser spectrum by Rob Kaufman in Australia earlier today failed to show any significant emission
After clear blue skies all afternoon the clouds have rolled in here but no doubt we will have better spectra tonight
Here is a low resolution R~1000 spectrum of the new bright object in Her. Taken with a LISA on a 0.28m SCT.
This has been instrument and atmospheric response corrected.
David
Another bright nova! Here’s my image https://britastro.org/observations/observation.php?id=20210612_231222_b0ed29be83050b55. I’ve taken some 1s exposures too which I’ll measure later.
It’s wonderful that a ‘new star’ appears in the sky when the weather is ideal! The BAA notification system worked perfectly and I was able to observe the possible Nova Her 2021 after first capturing another spectrum of Nova Cas 2021. This is an extraordinary spectrum the like of which I haven’t seen before
Cheers
Hugh
Whilst test running a new 2nd main telescope (16″, F:6 Newt) I was able to image the new Nova in Hercules, using a Moravian MkII 3200ME camera, 2x binning and a 1 sec exposure
Now confirmed as a Nova by Munari, Valisa and Dellaporta in an ATEL 14704: “Spectroscopic classification of TCP J18573095+1653396 as a nova bordering naked-eye brightness”
Very broad P Cygni H and He by the looks. Almost overlapping with the high velocity. Almost a supernova like spectrum
After a little sleep I’ve attempted to interpret last night’s spectrum. I estimate an explosion velocity of about 3450 km/sec based on the P Cygni profile of the Hα emission. I’ve annotated the spectrum with the rest wavelengths of the first seven H Balmer lines, where at the shortest wavelengths the P Cygni profiles are not consistently positioned based on my estimated explosion velosity. I also added couple of the HeI l lines where the positions are consistent. Using my explosion velocity, several of the deepest absorption lines appear more consistent with some specific metal P Cygni profiles. It’s certainly a fascinating spectrum
Cheers
Hugh
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