June 14, 2021
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Novae: https://www.aavso.org/https://www.aavso.org/tcp-j185730951653396-bright-probable-nova-mag-64-hercules
- Cataclysmic Variables: https://www.aavso.org/bright-nova-hercules-tcp-j185730951653396
- Time Sensitive Alerts: https://www.aavso.org/tcp-j185730951653396-bright-probable-nova-mag-64-hercules (goes to thread in Novae forum)
Please subscribe to these threads if you are observing this nova so you can be updated as to its behavior and any observing campaigns on it. Join in the discussion or ask questions there!
Event: Nova in Hercules: N Her 2021 = TCP J18573095+1653396 = ZTF19aasfsjq
Discovered by: Seiji Ueda (Kushiro, Hokkaido, Japan, via TOCP)
Discovery magnitude: unfiltered CCD magnitude 8.4 (three frames, using Canon EOS 6D digital camera + 200-mm f/3.2 lens with 6-s exposure, via TOCP)
Discovery date: 2021 June 12.537 UT (via TOCP)
Coordinates (2000.0): R.A. 18 57 30.98 Decl. +16 53 39.6 (from VSX page for N Her 2021)
Spectra: Spectra indicating the object to be a very fast, reddened, classical nova discovered before maximum have been obtained by multiple researchers, including:
- Munari et al. (ATel #14704) on 2021 Jun. 12.84 UT (high resolution) and on Jun. 12.85 UT (low resolution).
- Aydi et al. (ATel #14710) on 2021 Jun. 12.93 UT (low resolution), Jun. 13.01 UT (low resolution), and on Jun. 13.84 UT (high resolution).
- L. Franco (Rome, Italy) (low resolution) on 2021 Jun. 13.9340 UT with a 0.2-m telescope and Alpy600 spectrograph. Spectrum plot: https://digidownload.libero.it/A81_Observatory/Images/_tcpj18573095+1653396_20210613_934_LFranco.png
A low-resolution optical spectrum obtained by R. Kaufman (White Cliffs, NSW, Australia) on 2021 Jun. 12.6917 UT showed no significant emissions above the noise level. Kaufman's spectrum: https://hosting.photobucket.com/images/ww271/Rob_Kau/TCP_J18573095_1653396_spectrum_12_June_2021_text.jpg?width=450&height=278&crop=fill
Observing recommendations: Please observe N Her 2021 as it continues to evolve, with observations of all types (visual, CCD, DSLR, PEP, spectroscopy) and multiple bands as instrumentation permits. Dr. Fred Walter (Stony Brook University) recommends observations at a frequency of a minimum of one observation per night per band. For spectroscopy, he recommends spectra in blue to observe He II 4686, H-beta, and the Bowen blend (4640A), in addition to H-alpha, with a cadence of one spectrum per clear night.
Observations reported to the AAVSO (selected from over 200 observations from 61 observers at time of compilation):
2021 Jun. 12.192 UT, 16.3: g (ASAS-SN Sky Patrol, pre-discovery, reported via P. Schmeer, Saarbruecken-Bischmisheim, Germany);
12.537, 8.4 unfiltered CCD (S. Ueda, Kushiro, Hokkaido, Japan, discovery, via TOCP)
12.551, 6.7 unfiltered CCD (K. Itagaki, Yamagata, Japan, not an independent discovery, via TOCP);
12.64236, 6.4 (A. Pearce, Nedlands, W. Australia, confirming observation);
12.68611, 6.3 (Pearce);
12.698, 6.091 CR (Y. Sano, Nayoro Hokkaido, Japan, via TOCP);
12.7090, 6.4 TG (R. Kaufman, Whitecliffs, NSW, Australia, reddish under high saturation);
12.72375, 6.24 TG +/-0.05 (F. Romanov, Yuzhno-Morskoy, Nakhodka, Russian Fed.);
12.85625, 6.0 (L. Kocsmaros, Zrenjanin, Serbia);
12.86458, 6.2 (M. Vladut, Bucuresti, Romania);
12.87708, 6.4 (S. Keszthelyi, Bucsu, Hungary);
12.90, 6.903 B (Munari et al., ANS Collaboration telescope IR 0310, via ATel #14704);
12.90, 6.184 V (Munari et al.);
12.90, 5.749 R (Munari et al.);
12.90, 5.232 I (Munari et al.);
12.90310, 6.51 CV +/-0.01 (K. Sokolovsky, Moscow, Russian Fed.);
12.90764, 6.4 (D. Heinonen, Varmdo, Sweden);
12.90870, 6.963 B +/-0.018 (D. Boyd, Wantage, Oxon., UK);
12.90875, 6.324 V +/-0.013 (Boyd);
12.91390, 6.4 (G. Holmberg, Lund, Sweden);
12.91597, 6.2 (K. Wenzel, Grossostheim, Germany);
12.92100, 6.2 (G. Poyner, Birmingham, UK);
12.92500, 6.3 (J. Shears, Bunbury, Cheshire, UK);
12.92640, 6.4 (E. Muyllaert, Oostende, Belgium);
12.93184, 7.059 B +/-0.020 (Boyd);
12.93189, 6.366 V +/-0.013 (Boyd);
12.93403, 6.3 (H. Hautecler, Boutersem, Belgium);
12.93850, 6.218 TG +/-0.007 (D. Blane, Henley-on-Klip, S. Africa);
12.94100, 6.2 (A. Glez-Herrera, Ferrol, Spain);
12.94514, 6.2 (L. Camargo da Silva, Cesson-Sevigne, France);
12.95900, 6.13 V +/-0.11 (M. Kolb, Wuppertal, Germany);
12.95900, 6.96 B +/-0.2 (Kolb);
12.96050, 6.138 V +/-0.020 (P. Lindner, Hoyerswerda, Germany);
12.96427, 7.094 B +/-0.020 (Lindner);
12.97010, 6.4 (M. Poxon, Great Plumstead, Norfolk, UK);
12.99722, 6.3 (H. Dahle, Oslo, Norway);
13.01021, 6.542 TG +/-0.064 (J. Temprano, Santander, Spain);
13.02292, 6.7 (A. Amorim, Florianopolis, Brazil);
13.03300, 6.3 (Poyner);
13.06269, 6.805 TR +/-0.052 (J. Backman, Lappeenranta, Finland);
13.06310, 7.343 TG +/-0.039 (Backman);
13.06352, 8.065 TB +/-0.032 (Backman);
13.06657, 7.393 TG +/-0.076 (R. Tyson, Glen Burnie, MD);
13.07153, 6.9 (Amorim);
13.07292, 6.5 (C. da Silva, Luminarias, Brazil);
13.08300, 6.3 (Poyner);
13.08681, 6.5 (L. Araujo, Pelotas, Brazil);
13.08750, 6.9 (C. Adib, Porto Alegre, Brazil);
13.09447, 6.838 V +/-0.017 (Romanov, remotely from Abbey Ridge Observatory, Canada);
13.09461, 7.69 B +/-0.108 (Romanov, remotely from Abbey Ridge Observatory, Canada);
13.09722, 6.7 (M. Deconinck, Artignosc sur Verdon, France);
13.15, 6.2 R (E. Guido and A. Valvasori, remotely with TEL 0.32-m f/8.0 reflector + CCD, Nerpio, Spain (iTelescope network (MPC Code I89), via TOCP);
13.15417, 7.0 (R. King, Duluth, MN);
13.15486, 7.1 (L. Herrington, Spring, TX);
13.15972, 6.8 (C. Chiselbrook, Canton, GA);
13.16208, 7.872 B +/-0.05 (J.-B. Desrosiers, Val Racine, QC, Canada);
13.16255, 6.924 V +/-0.03 (Desrosiers);
13.16287, 6.092 R +/-0.05 (Desrosiers);
13.16319, 5.322 I +/-0.05 (Desrosiers);
13.18403, 7.2 (E. Briggs, Cheektowaga, NY);
13.21181, 7.3 (A. Padilla Filho, Rio de Janeiro, Brazil);
13.22292, 7.2 (J. Barentine, Tucson, AZ);
13.23194, 7.2 (M. Napper);
13.24514, 7.5 (Sokolovsky);
13.36110, 7.25 (M. Komorous, London, ON, Canada);
13.66111, 8.0 (N. Brown, Yanchep, W. Australia);
13.76600, 7.73 CV +/-0.01 (Sokolovsky);
13.86111, 8.0 (B. Eigner, Csabdi, Hungary);
13.86250, 8.2 (B. Bago, Piliscsaba, Hungary);
13.86260, 8.267 TG +/-0.025 (W. Vollmann, Vienna, Austria);
13.87222, 8.1 (S. Keszthelyi, Bucsu, Hungary);
13.87361, 8.046 V +/-0.01 (V. Tuboly, Hungary);
13.87500, 8.3 (R. Fidrich, Budapest, Hungary);
13.87780, 8.1 (W. Kriebel, Schierling/Walkenstetten, Germany);
13.88, 7.98 V +/-0.01 (Aydi et al., B-V = 0.56, via ATel #14710);
13.88125, 8.3 (Wenzel);
13.88981, 8.213 V +/-0.004 (O. Nickel, Mainz, Germany);
13.89375, 8.4 (Kocsmaros);
13.90625, 8.2 (Vladut);
13.91107, 8.897 B +/-0.006 (Boyd);
13.91116, 8.345 V +/-0.004 (Boyd);
13.91250, 8.306 V +/-0.074 (Kolb);
13.91250, 9.13 B +/-0.1 (Kolb);
13.91319, 8.4 (P. Wils, Hever, Belgium);
13.92160, 7.07 R (A. Valvasori, Bologna, Italy);
13.92708, 8.0 (A. Morozov, Novozybkov, Russian Fed.);
13.92766, 8.296 V +/-0.008 (M. Morales Aimar, Sencelles, Spain);
13.92887, 8.257 V +/-0.004 (F. Dubois, Zillebeke, Belgium);
13.93100, 8.3 (Vollmann);
13.94375, 8.3 (V. Voropaev, Krasnogorsk, Russian Fed.);
13.95100, 8.4 (G. Poyner, Birmingham, UK)
13.95536, 8.291 V +/-0.008 (Lindner);
13.95742, 8.909 B +/-0.007 (Lindner);
13.96670, 8.3 (E. van Ballegoij, Heesch, Netherlands);
13.97431, 8.4 (Dahle);
13.99444, 8.2 (D. Koehn, Germany);
13.99600, 8.280 CV (Poyner);
14.02639, 8.3 (Amorim);
14.10521, 8.586 V +/-0.010 (D. Koehn, Germany);
14.10534, 9.016 B +/-0.059 (Romanov, remotely from Abbey Ridge Observatory, Canada);
14.11458, 8.5 (B. Vietje, South Ryegate, VT);
14.15098, 8.612 TG +/-0.037 (G. Williamson, UK);
14.18403, 8.4 (Padilla Filho);
14.20556, 8.5 (King);
14.20764, 8.6 (Napper);
14.21944, 8.45 (Herrington);
14.22361, 8.3 (P. Zeller, Indianapolis, IN);
14.25350, 8.6 (Komorous);
14.39907, 8.744 V +/-0.018 (Pearce);
14.39962, 8.767 V +/-0.006 (Pearce);
14.40019, 8.734 V +/-0.016 (Pearce);
14.40080, 7.027 I +/-0.021 (Pearce);
14.40134, 7.029 I +/-0.021 (Pearce);
14.56944, 8.7 (A. Sang, Makati City, Philippines);
Charts: Charts with comparison stars for N Her 2021 may be created using the AAVSO Variable Star Plotter (VSP).
Submit observations: Please submit observations using the name N HER 2021. When a GCVS permanent name is assigned, please use that to submit observations.
- Submit optical observations to the AAVSO International Database using WebObs.
- Submit spectra to the AAVSO Spectroscopy Database (AVSpec).
Notes:
a. Designated TCP J18573095+1653396 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP).
b. S. Ueda reports that nothing is visible down to magnitude 13.0 at this location on exposures taken 2021 June 10.5 UT with same digital camera (via TOCP).
c. P. Schmeer reports that ASAS-SN Sky Patrol images show no previous brightening since 2015 January 27 (via TOCP).
d. P. Schmeer reports there is a previously known Zwicky Transient Facility transient ZTF19aasfsjq with (J2000.0) position end figures 30.985s, 39.55" (data since May 2019). Schmeer also reports the likely progenitor is Gaia source 4514092717838547584 (Gaia EDR3 position 18 57 30.983 +16 53 39.59; Gmag. 19.95) and Pan-STARRS1 source PSO J185730.981+165339.527 (gmag. 20.48).
e. Li Kwan-Lok (ATel #14705) reports detection of N Her 2021 as a gamma-ray source in Fermi-LAT data obtained on 2021 Jun. 12.0000 - 12.9840 UT.
f. Aydi et al. (ATel #14710) report time-series photometry of N Her 2021 from The New Milky Way wide-field survey.
g. Position end figures:
- A. Pearce (2021 Jun. 14.399 UT): 30.96s, 39.5"
- E. Guido and A. Valvasori (2021 Jun. 13.15 UT, via TOCP): 30.98s, 39.6"
h. Images:
- R. Kaufman (2021 Jun. 12.7090 UT, reddish under high saturation, via TOCP): https://hosting.photobucket.com/images/ww271/Rob_Kau/TCP_J18573095_1653396_12_June_2021_text.jpg?width=450&height=278&crop=fill
- F. Romanov (2021 Jun. 12.72375, stacked 32x10 sec., via TOCP):
https://www.flickr.com/photos/filipp-romanov/51242904498
- E. Guido and A. Valvasori (2021 Jun. 13.15, animation showing a comparison between our image and the archive POSS1 plate (1990-08-17), via TOCP): https://tinyurl.com/animationnovaher
Congratulations to Seiji Ueda on his discovery!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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