Nova in Hercules

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  • #574982
    Jeremy Shears
    Participant

    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.html

    ZTF 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-386b21100256

    Source No. 4514092717838547584 in Gaia EDR3 (Gmag. 19.95).

    Spectroscopy and multiband photometry are urgently required.

    Clear skies,
    Patrick
    ——-
    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..131a8003M

    #584333
    Jeremy Shears
    Participant

    Latest 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)

    #584334
    Jeremy Shears
    Participant

    Charts available from the AAVSO chart plotter. Here is a 5 deg chart. And here is 10 deg.

    Note that it’s almost in Aql: it is between epsilon Aql and 111 Her

    #584335
    Daryl Dobbs
    Participant

    In the twilight using opticron 15×70 binoculars I estimate the magnitude as 5.8

    #584336
    Gary Poyner
    Participant

    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

    #584337
    Jeremy Shears
    Participant

    Got it here at 6.3 vis, Jun 12 at 22h 12m, using 8 x 42 bins 

    #584338
    Paul Sutherland
    Participant

    Here is a photo just taken from Walmer, Kent. A 20 second exposure with a FujiFilm X-T10 and kit lens at 3200 ISO.

    #584339
    Paul Sutherland
    Participant

    And here as an attachment.

    #584340
    Robin Leadbeater
    Participant

    Intriguingly a low resolution Star Analyser spectrum by Rob Kaufman in Australia earlier today failed to show any significant emission

    https://hosting.photobucket.com/images/ww271/Rob_Kau/TCP_J18573095_1653396_spectrum_12_June_2021_text.jpg

    After clear blue skies all afternoon the clouds have rolled in here but no doubt we will have better spectra tonight

    #584341
    David Boyd
    Participant

    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

    #584342
    Nick James
    Participant

    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.

    #584343
    Nick Quinn
    Participant

    A short 5 second exposure with 35mm lens.

    #584344
    Francesco Campanini
    Participant

    5 seconds exposure – Canon 450d – Zenistar 73mm f=430mm APO – ISO 800 – Chesham UK

    #584346
    Hugh Allen
    Participant

    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

    #584347
    Eric Watkins
    Participant

    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

    #584348
    Jeremy Shears
    Participant

    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”

    #584349
    Robin Leadbeater
    Participant

    Very broad P Cygni H and He by the looks. Almost overlapping with the high velocity. Almost a supernova like spectrum

    #584350
    Dr James Dawson
    Participant

    In simple terms, what does the spectrum of the nova tell us about what is going on?

    #584351
    Hugh Allen
    Participant

    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

    #584352
    Alan Dowdell
    Participant

    Observed with Binos in a bright sky approx estimate 6th mag. Easy to find.

    Image was taken at 22.52 UT Canon 600D 10sec exposure undriven

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