July 30, 2021
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/tcp-j202107702914093-possible-nova-mag-12-vulpecula
- Novae: https://www.aavso.org/tcp-j202107702914093-possible-nova-mag-12-vulpecula-0
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 Vulpecula: N Vul 2021 = TCP J20210770+2914093 [V606 Vul]
Discovered by: Koichi Itagaki (Yamagata, Japan, via TOCP)
Discovery magnitude: unfiltered CCD magnitude 12.0 (using 180-mm camera lens + CCD, via TOCP)
Discovery date: 2021 July 16.475 UT (via TOCP)
Coordinates (2000.0): R.A. 20 21 07.70 Decl. +29 14 09.1 (from VSX page for N Vul 2021)
Spectra: Spectroscopy indicating the object to be a nova was obtained by:
- R. Leadbeater (Wigton, UK) on 2021 Jul. 16.915 UT. His spectrum may be viewed at: https://britastro.org/specdb/data_graph.php?obs_id=10094
- U. Munari et al. (ATel #14793) on 2021 Jul. 17.102 UT with the Stroncone 0.50-m telescope and mk.III Astrolight Instrument multi-mode spectrograph. Their spectra indicated an He/N type nova, but they commented that: "Should the nova still rise in brightness, it could cool down to a FeII type by the time of maximum."
Further spectra obtained by Munari et al. (ATel #14816) on Jul. 18.944 UT and Jul. 28.942 UT with the Asiago 1.82-m telescope indicate N Vul 2021 has evolved into an FeII type nova.
Observing recommendations: Please observe N Vul 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 every few hours in the early stages as the nova continues to brighten. Frequency of observation once past peak depends on the rate of decline, but should be 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. Cadence for spectra depends on how fast the nova evolves, but, he adds, "you can't go wrong with a spectrum every clear night."
The light curve below from the AAVSO International Database shows how N Vul 2021 began fading and is now brightening again. 36 observers worldwide contributed 935 observations to this light curve for 2021 16-30 July (JD 2459412-2459425).
Observations reported to the AAVSO: (selected from over 900 submitted at the time of compilation)
2021 Jul. 14.395 UT, <17.0 g (ASAS-SN Sky Patrol, via P. Schmeer, via TOCP);
15.380, 19.6 r (ZTF21abmbzax, Zwicky Transient Facility (via P. Schmeer, via TOCP);
15.489, <14.2 unfiltered CCD (K. Itagaki, Yamagata, Japan, via TOCP);
16.147, 13.19 g (ASAS-SN);
16.178, 13.05 g (ASAS-SN);
16.190, 13.02 g (ASAS-SN);
16.475, 12.0 unfiltered CCD (Itagaki, discovery observation, via TOCP);
16.54490, 11.8 R +/- 0.1 (F. Watanabe, Nayoro Observatory, Nayoro, Japan, via TOCP);
16.5647, 13.13 B (S. Kiyota, Kamagaya, Japan, via TOCP);
16.5647, 12.28 V (Kiyota);
16.5647, 11.68 Rc (Kiyota);
16.5647, 11.15 Ic (Kiyota);
16.75579, 12.77 B +/- 0.01 (N. Ikonnikova and K. Sokolovsky, 0.6-m SAI Moscow State University telescope (Kislovodsk, Russia), via TOCP);
16.75584, 12.19 V +/- 0.01 (Ikonnikova and Sokolovsky);
16.75610, 11.46 Rc +/- 0.01 (Ikonnikova and Sokolovsky);
16.75633, 11.24 Ic +/- 0.01 (Ikonnikova and Sokolovsky);
16.83588, 11.657 R +/- 0.015 (N. Ruocco, Sorento, Italy);
16.83629, 12.432 V +/- 0.021 (Ruocco);
16.877, 13.087 B (Munari et al., ATel #14816);
16.877, 12.395 V (Munari et al.);
16.877, 11.706 R (Munari et al.);
16.877, 11.126 I (Munari et al.);
16.89750, 12.327 V +/- 0.036 (M. Larsson, Malmoe, Sweden);
16.89950, 12.42 TG +/- 0.03 (R. Fidrich, Budapest, Hungary, remotely with a 150-mm iTelescope APO Refractor in Nerpio, Spain);
16.90973, 12.4 (D. Vansteelant, Varsenare, Belgium);
16.93654, 12.491 V +/- 0.021 (Larsson);
16.93750, 12.2 (L. Lindhard, Esbjerg N, Denmark);
16.94124, 11.2 CR +/- 0.24 (J. G. Bosch, Haute Savoie, France);
16.94800, 12.3 (G. Poyner, Birmingham, UK);
17.02708, 12.7 (M. Deconinck, Artignosc sur Verdon, France);
17.14700, 12.668 TG (Poyner);
17.26833, 11.357 I +/- 0.0043 (R. Schmidt, Washington, DC);
17.27484, 11.902 TR +/- 0.046 (J. Backman, Lappeenranta, Finland);
17.27538, 12.780 TG +/- 0.035 (Backman);
17.27590, 13.449 TB +/- 0.024 (Backman);
17.461, 12.4 unfiltered CCD (Itagaki);
17.584, 12.6 unfiltered CCD (Itagaki);
17.83333, 13.1 (I. Muravev, Russian Federation);
17.84583, 12.506 TR (P. Jordanov, Dimitrovgrad, Bulgaria);
17.84583, 13.037 TG (Jordanov);
17.84583, 13.735 TB (Jordanov);
17.85417, 13.0 (V. Cseh, Debrecen, Hungary);
17.88867, 11.695 I +/- 0.025 (Larsson);
17.88980, 13.050 V +/- 0.036 (Larsson);
17.89297, 12.991 V +/- 0.008 (A. Mantero, Bernezzo, Italy);
17.90732, 13.853 B +/- 0.008 (D. Boyd, West Challow, Wantage, UK);
17.90789, 13.096 V +/- 0.005 (Boyd);
17.90790, 13.001 V +/- 0.085 (J. Shears, Bunbury, UK);
17.91814, 13.021 V +/- 0.029 (H. Braunwarth, Hamburg, Germany);
17.94866, 13.096 V +/- 0.009 (M. Morales Aimar, Sencelles, Spain);
17.96300, 13.1 (Poyner);
17.97430, 13.1 (E. Muyllaert, Oostende, Belgium);
17.97917, 12.5 (Lindhard);
18.04900, 13.101 TG (Poyner);
18.19162, 13.146 TG +/- 0.018 (Backman);
18.19213, 13.833 TB +/- 0.033 (Backman);
18.897, 13.752 B (Munari et al.);
18.897, 13.111 V (Munari et al.);
18.897, 12.410 R (Munari et al.);
18.897, 11.925 I (Munari et al.);
18.90778, 12.356 R +/- 0.007 (E. Reina, Spain);
18.91817, 13.056 V +/- 0.033 (Reina);
18.93000, 13.018 CV (Poyner);
18.96205, 12.958 CV +/- 0.007 (Shears);
18.96940, 13.1 (Muyllaert);
18.97013, 13.849 B +/- 0.004 (Boyd);
18.97044, 13.108 V +/- 0.003 (Boyd);
19.83015, 12.829 CV +/- 0.018 (S. Brincat, San Gwann, Malta);
19.88488, 13.018 V +/- 0.008 (Morales Aimar);
19.88957, 11.662 I +/- 0.004 (Reina);
19.90538, 13.629 B +/- 0.018 (Reina);
19.93471, 12.278 R +/- 0.008 (Reina);
19.95100, 13.2 (Poyner);
19.96276, 12.824 CV +/- 0.014 (Shears);
20.00111, 12.960 V +/- 0.013 (A. Agudo Azcona, Badajoz, Spain);
20.23836, 11.5443 I +/- 0.0110 (Schmidt);
20.80117, 12.605 CV +/- 0.020 (Brincat);
20.8883, 11.7 CR (G. Masi, remotely using the 17" robotic unit, Virtual Telescope Project facility, Ceccano, Italy, via TOCP);
20.91900, 12.695 CV (Poyner);
20.95546, 12.621 CV +/- 0.004 (Shears);
20.96900, 12.8 (Poyner);
21.00328, 12.5188 CV +/- 0.0077 (I. Peretto, Cornedo, Vicino, Italy);
21.89426, 11.129 I +/- 0.002 (Reina);
21.89795, 12.480 V +/- 0.006 (R. Farfan, Ecija, Spain);
21.91032, 13.171 B +/- 0.018 (Reina);
21.92674, 12.449 V +/- 0.004 (Reina);
21.93000, 12.378 CV (Poyner);
21.93554, 13.306 B +/- 0.012 (Boyd);
21.93590, 12.477 V +/- 0.006 (Boyd);
21.95872, 12.369 CV +/-0.008 (Shears);
21.98600, 12.4 (Poyner);
22.00086, 12.502 V +/- 0.015 (Agudo Azcona);
22.12934, 13.185 B +/- 0.004 (D. Cejudo Fernandez, Madrid, Spain);
22.13256, 12.483 V +/- 0.002 (Cejudo Fernandez);
22.13653, 11.806 R +/- 0.002 (Cejudo Fernandez);
22.14346, 11.176 I +/- 0.002 (Cejudo Fernandez);
22.33819, 12.5 (L. Shotter, Uniontown, PA);
22.86822, 12.522 TG +/- 0.163 (I. Sergey, Molodechno, Belarus);
22.87824, 12.449V +/- 0.007 (Morales Aimar);
22.88800, 12.42 (Poyner);
22.929, 13.220 B (Munari et al.);
22.929, 12.447 V (Munari et al.);
22.929, 11.786 R (Munari et al.);
22.929, 11.162 I (Munari et al.);
22.93400, 12.4 (Muyllaert);
22.94275, 13.240 B +/- 0.005 (Boyd);
22.94307, 12.439 V +/- 0.005 (Boyd);
22.95374, 11.763 R +/- 0.007 (Reina);
22.96797, 12.437 V +/- 0.003 (Reina);
22.98327, 13.096 B +/- 0.008 (Reina);
22.99902, 11.111 I +/- 0.007 (Reina);
23.85069, 12.15 V +/- 0.01 (Y. Solomonov, Moscow, Russian Fed.);
23.89100, 11.933 CV (Poyner);
24.08130, 10.8347 I +/- 0.0056 (Schmidt);
24.13531, 12.789 B +/- 0.008 (Cejudo Fernandez);
24.13800, 12.112 V +/- 0.004 (Cejudo Fernandez);
24.14116, 11.488 R +/- 0.003 (Cejudo Fernandez);
24.14663, 10.890 I +/- 0.003 (Cejudo Fernandez);
24.20651, 11.450 R +/- 0.003 (F. Romanov, Primorsky Krai, Russian Fed., remotely using 0.355-m f/6.2 Schmidt-Cass at Abbey Ridge Observatory (Canada));
24.20733, 10.840 I +/- 0.005 (Romanov);
24.20817, 12.070 V +/- 0.004 (Romanov);
24.20899, 12.745 B +/- 0.016 (Romanov);
24.83333, 12.45 V +/- 0.01 (Solomonov);
24.88500, 11.957 CV (Poyner);
25.13602, 12.570 B +/- 0.007 (Cejudo Fernandez);
25.13871, 11.851 V +/- 0.004 (Cejudo Fernandez);
25.14186, 11.248 R +/- 0.003 (Cejudo Fernandez);
25.14733, 10.647 I +/- 0.003 (Cejudo Fernandez);
25.89200, 11.850 CV (Poyner);
25.95400, 12.1 (Poyner);
25.98157, 12.006 TG +/- 0.029 (G. Williamson, UK);
25.98205, 11.853 V +/- 0.009 (Agudo Azcona);
26.08056, 12.27 (Deconinck);
26.11103, 10.5403 I +/- 0.0064 (Schmidt);
26.81627, 11.605 CV +/- 0.005 (C. Galdies, Naxxar, Malta);
26.87636, 11.832 V +/- 0.005 (Morales Aimar);
26.89900, 11.796 CV (Poyner);
26.98832, 11.877 TG +/- 0.019 (Williamson);
27.20000, 11.9 (R. Young, Harrisburg, PA);
27.87584, 11.525 V +/- 0.004 (Morales Aimar);
27.91429, 12.229 B +/- 0.021 (Larsson);
27.91722, 10.321 I +/- 0.016 (Larsson);
27.99365, 11.571 TG +/- 0.060 (Williamson);
28.12219, 11.346 8 V +/- 0.0061 (J. Philpot, Franklin, TN);
28.89916, 11.109 V +/- 0.010 (Boyd);
28.89938, 11.875 B +/- 0.017 (Boyd);
28.939, 11.828 B (Munari et al.);
28.939, 11.088 V (Munari et al.);
28.939, 10.514 R (Munari et al.);
28.939, 9.956 I (Munari et al.);
28.98900, 11.108 CV (Poyner);
28.98971, 10.541 TR +/- 0.014 (Williamson);
28.99013, 11.160 TG +/- 0.026 (Williamson);
28.99068, 11.936 TB +/- 0.094 (Williamson);
28.99172, 11.043 V +/- 0.006 (Agudo Azcona);
28.99200, 11.2 (Poyner);
29.04708, 11.028 V +/- 0.017 (Braunwarth);
29.04767, 11.715 B +/- 0.032 (Braunwarth);
29.14965, 10.998 V +/- 0.0061 (Philpot);
29.25169, 10.367 R +/- 0.002 (Romanov);
29.25250, 9.779 I +/- 0.005 (Romanov);
29.25336, 10.953 V +/- 0.004 (Romanov);
29.25418, 11.612 B +/- 0.010 (Romanov);
29.86740, 10.9 (W. Kriebel, Schierling/Walkenstetten, Germany);
29.90286, 10.610 V +/- 0.013 (Reina);
29.91798, 11.364 B +/- 0.017 (Reina);
29.92937, 9.443 I +/- 0.011 (Reina);
29.93898, 10.027 R +/- 0.005 (Reina);
30.27220, 10.8 (M. Koromous, London, ON, Canada);
Charts: Charts with comparison stars for N Vul 2021 may be created using the AAVSO Variable Star Plotter (VSP).
Submit observations: Please submit observations using the name N VUL 2021. When a GCVS name is assigned to this nova, please use it when submitting observations.
- Submit optical observations to the AAVSO International Database using WebObs.
- Submit spectra to the AAVSO Spectroscopy Database (AVSpec).
Notes:
a. Designated TCP J20210770+29140930 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP).
b. P. Schmeer (Saarbrücken-Bischmisheim, Germany) reports no previous brightenings had been recorded in the ASAS-SN Sky Patrol data since 2015 February 27.
c. P. Schmeer reports the likely progenitor is catalogued as:
- Gaia EDR3 1861166838700691968 (RA 20 21 07.704 DEC +29 14 09.09, equinox J2000.0, epoch J2016; Gmag. 21.05)
- SDSS J202107.70+291409.0 (gmag. 22.3, rmag. 21.7, imag. 21.4)
- Pan-STARRS1 source PSO J202107.703+291409.136 (gmag. 21.85, rmag. 21.29, imag. 21.13
d. Images
- K. Itagaki (2021 Jul. 16.475 UT, discovery image, via TOCP): http://k-itagaki.jp/images/2021-Vul.jpg
- S. Kiyota (2021 Jul 16.5647 UT, via TOCP): http://meineko.sakura.ne.jp/ccd/TCP_J20210770+2914093.jpg
- R. Fidrich (2021 Jul. 16.8995 UT, via TOCP): https://twitter.com/fidusz/status/1416585687558725639
e. Position end figures:
- F. Watanabe (2021 Jul. 16.54490 UT, via TOCP): 07.67s, 10.0"
- G. Masi (2021 Jul 20.8883 UT, via TOCP): 07.70s, 09.0"
Congratulations to Koichi Itagaki on his discovery!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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