July 2, 2018
Event: Nova in Scutum - N Sct 2018 = TCP J18292290-1430460
Discovered by: Yukio Sakurai (Mito, Japan)
Discovery magnitude: unfiltered CCD magnitude 10.3, on two frames using Nikon D7100 digital camera + 180-mm f/2.8 lens
Discovery date: 2018 June 29.5768 UT
Coordinates (2000.0): R.A. 18 29 22.93 Decl. -14 30 44.2 (from VSX)
Spectra: Olivier Garde and Umberto Sollecchia (ARAS Group) report (ATel #11802) that echelle spectra obtained by Garde (Observatoire de la Tourbiere, France) on 2018 June 30.861 UT and low resolution grim spectra obtained by Sollecchia (L'Aquila, Italy) on June 30.874 UT indicate N Sct 2018 to be a classical nova in the optically thick (Fe-curtain) stage. All spectra are publicly available though the ARAS database at http://www.astrosurf.com/aras/Aras_DataBase/Novae/2018_NovaSct2018.htm
Observing recommendations: Observations of all types (visual, CCD, DSLR, PEP, spectroscopy) and multiple bands as instrumentation permits are strongly encouraged as the nova evolves.
Observations reported to the AAVSO:
2018 June 23.435 UT, <15.3 V (ASAS-SN Sky Patrol, reported via P. Schmeer, Saarbrücken-Bischmisheim, Germany);
23.632, <12.1 (Y. Sakurai, Mito, Japan; via TOCP);
30.2646, 10.43 V (S. Kiyota, Japan, with 0.61-m f/6.5 CDK astrograph + FLI PL09000 CCD, iTelescope.NET at Auberry, CA, USA; via TOCP);
30.2646, 9.35 Ic (Kiyota; via TOCP);
30.528, 10.57 V (K. Yoshimoto, Yamaguchi-ken, Japan, using 0.50-m f/6.8 reflector + CCD + focal reducer, Siding Spring, remotely; via TOCP);
30.528, 9.69 R (Yoshimoto; via TOCP);
30.528, 8.84 I (Yoshimoto; via TOCP);
30.5960, 12.16 B (Kiyota, with 0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD at iTelescope.NET, SSO, NSW, Australia; via TOCP);
30.5960, 10.98 V (Kiyota, 0.43-m f/6.8 CDK astrograph; via TOCP);
30.5960, 10.37 Rc (Kiyota, 0.43-m f/6.8 CDK astrograph; via TOCP);
30.5960, 9.83 Ic (Kiyota, 0.43-m f/6.8 CDK astrograph; via TOCP);
30.82110, 10.717 TG +/-0.016 (D. Blane, Henley-on-Klip, South Africa);
30.90486, 10.5 (R. Tyson, Freeport, NY);
30.90610, 10.723 TG +/-0.013 (Blane);
30.91696, 10.742 V +/-0.009 (T. Vanmunster, Landen, Belgium);
30.93741, 10.783 V +/-0.008 (Vanmunster);
30.93940, 10.590 V +/-0.005 (A. Mantero, Cuneo, Italy);
30.93953, 10.702 V +/-0.005 (Mantero);
30.94013, 10.788 V +/-0.008 (Vanmunster);
30.94240, 10.810 V +/-0.008 (Vanmunster);
30.94555, 10.793 V +/-0.008 (Vanmunster);
30.94661, 10.822 V +/-0.008 (Vanmunster);
30.94734, 12.481 B +/-0.034 (D. Boyd, Wantage, Ox., UK);
30.94769, 10.832 V +/-0.008 (Vanmunster);
30.94775, 10.651 V +/-0.017 (Boyd);
30.94806, 9.694 R +/-0.023 (Boyd);
30.94848, 12.519 B +/-0.036 (Boyd);
Jul. 01.00021, 9.583 R +/-0.020 (Boyd);
01.00048, 12.436 B +/-0.036 (Boyd);
01.00160, 10.761 V +/-0.008 (Vanmunster);
01.00195, 10.578 V +/-0.017 (Boyd);
01.00212, 9.558 R +/-0.033 (Boyd);
01.00238, 12.432 B +/-0.032 (Boyd);
01.00264, 10.788 V +/-0.008 (Vanmunster);
01.00270, 10.595 V +/-0.013 (Boyd);
01.00290, 9.588 R +/-0.017 (Boyd);
01.00317, 12.440 B +/-0.040 (Boyd);
01.00347, 10.616 V +/-0.013 (Boyd);
01.00362, 9.568 R +/-0.035 (Boyd);
01.00369, 10.779 V +/-0.008 (Vanmunster);
01.00623, 12.458 B +/-0.035 (Boyd);
01.00647, 10.594 V +/-0.019 (Boyd);
01.00662, 9.596 R +/-0.020 (Boyd);
01.00675, 10.763 V +/-0.008 (Vanmunster);
01.00683, 12.401 B +/-0.033 (Boyd);
01.00707, 10.583 V +/-0.027 (Boyd);
01.00722, 9.635 R +/-0.025 (Boyd);
01.01008, 10.574 V +/-0.023 (Boyd);
01.01024, 9.621 R +/-0.037 (Boyd);
01.01031, 10.745 V +/-0.008 (Vanmunster);
01.01045, 12.404 B +/-0.034 (Boyd);
01.01911, 10.529 V +/-0.027 (Boyd);
01.01926, 9.477 R +/-0.028 (Boyd);
01.01946, 12.339 B +/-0.034 (Boyd);
01.01970, 10.570 V +/-0.028 (Boyd);
01.01985, 9.523 R +/-0.035 (Boyd);
01.02006, 12.336 B +/-0.035 (Boyd);
01.05600, 10.6 (G. Poyner, Birmingham, UK);
01.07014, 10.78 (M. Deconinck, Artignosc sur Verdon, France);
01.08125, 10.7 (Deconinck);
01.08403, 10.56 (Deconinck);
01.28947, 10.721 V +/-0.003 (P. Lewin, Glendora, CA);
01.28987, 10.690 V +/-0.003 (Lewin);
01.33179, 10.540 CV +/-0.003 (G. Stone, Auberry, CA);
01.33198, 10.650 V +/-0.003 (Lewin);
01.33274, 10.506 CV +/-0.003 (Stone);
01.33713, 10.641 V +/-0.003 (Lewin);
01.33870, 10.610 V +/-0.003 (Lewin);
01.34970, 10.552 CV +/-0.003 (Stone);
01.36777, 10.530 CV +/-0.003 (Stone);
01.50245, 12.405 B +/-0.025 (A. Pearce, Nedlands, W. Australia);
01.50380, 10.899 V +/-0.011 (Pearce);
01.50464, 9.735 R +/-0.026 (Pearce);
01.50532, 8.770 I +/-0.015 (Pearce);
01.59926, 8.934 I +/-0.056 (K. Menzies, Framingham, MA);
01.60080, 11.049 V +/-0.029 (Menzies);
01.84590, 11.159 TG +/-0.016 (Blane);
01.89000, 11.2 (W. Vollmann, Vienna, Austria);
01.90417, 11.2 (Tyson);
01.91087, 10.814 CV +/-0.024 (J. Dos Santos, Buenos Aires, Argentina);
01.93170, 11.080 TG +/-0.007 (Blane);
01.95140, 11.0 (A. Amorim, Florianopolis, Brazil);
02.02220, 11.4 (Amorim);
02.09514, 11.3 (Deconinck);
02.10347, 11.2 (Deconinck);
02.21678, 11.107 V +/-0.010 (B. Harris, New Smyrna Beach, FL);
02.21764, 12.465 B +/-0.018 (Harris);
02.21847, 10.231 R +/-0.030 (Harris);
Charts: Charts with a comparison star sequence for N Sct 2018 may be created using the AAVSO Variable Star Plotter (VSP).
Submit observations: Please submit observations to the AAVSO International Database using the name N SCT 2018. Once a GCVS name is announced in an IAU Circular or CBET, please use that name.
AAVSO Forums: N Sct 2018 is the topic of the AAVSO Novae forum thread https://www.aavso.org/tcp-j18292290-1430460-likely-nova-103-mag-scutum
Notes:
a. Designated TCP J18292290-1430460 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP). Some information in this Alert Notice is taken from the TOCP page.
b. Sakurai writes there is a variable star TSVSC1-TN-S300112300-126-67-2 at 21.88s and 51.1".
c. P. Schmeer (Saarbrücken-Bischmisheim, Germany) writes that a progenitor candidate is the Pan-STARRS1 source PSO J182922.940-143044.155 (position end figures 22.935s, 44.19"; i= 20.26 mag); [eruption amplitude is] of more than 11 magnitudes (V band). He also writes that the Bochum Galactic Disk Survey variable star GDS_J1829246-143046 (Gaia DR2 position end figures 24.578s, 47.30"; G= 12.85 mag) is 25" east of the position reported by Sakurai.
d. Position end figures
- S. Kiyota (2018 Jun. 30.2646 UT; via TOCP): 22.93s, 43.9"
- K. Yoshimoto (2018 Jun. 30.528 UT; via TOCP): 22.96s, 44.0"
- T. Vanmunster (2018 Jun. 30.93 UT): 22.97s, 44.1" (with 0.3" uncertainty)
- A. Mantero (2018 Jun. 30.9394 UT; via TOCP): 22.96s, 43.9"
e. Images
- K. Yoshimoto (2018 30.528 UT): http://orange.zero.jp/k-yoshimoto/TCP-J18292290-1430460_0630.jpg
Congratulations to Yukio Sakurai on his latest discovery!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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