February 13, 2024
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Time Sensitive Alerts: https://www.aavso.org/nova-in-sco-2024-pnv-j-17261813-3809354
- Novae: https://www.aavso.org/pnv-scorpius-2024
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 Scorpius - V1723 Sco = N Sco 2024 = PNV J17261813-3809354
Discovered independently by:
- Andrew Pearce (Nedlands, W. Australia)
- Yukio Sakurai (Mito, Japan) (via S. Nakano, CBET 5346)
Discovery magnitude:
- Pearce: 7.3 unfiltered CCD, using Canon 800D digital camera + 85-mm f/1.2 lens
- Sakurai: 7.1 unfiltered, using Nikon 7100 digital camera (+ 180-mm-f.l. f/2.8 lens) (via S. Nakano, CBET 5346)
Discovery date:
- Pearce: 2024 February 9.844 UT
- Sakurai: 2024 February 9.836 UT (via S. Nakano, CBET 5346)
Coordinates (2000.0): R.A. 17 26 18.07 Dec. -38 09 36.3 (from VSX page for V1723 Sco)
Spectra: Spectroscopy indicating the object to be a classical nova has been reported by:
- O. Garde on behalf of the Southern Spectroscopic Project Observatory Team (2SPOT) on 2024 Feb. 11.347 UT with the "Deep Sky Chile" 30.5-cm Ritchey-Chretien telescope (+ATIK460Ex camera + echelle optical-fiber spectrograph); spectrum at http://www.spectro-aras.com/forum/viewtopic.php?t=3113 (CBET 5346);
- E. Aydi et al. (ATel #16440) on Feb 10.4 UT with the 4.1-m Southern Astrophysical Research (SOAR) telescope, Cerro Pachon, Chile).
General observing recommendations: Generally, please observe V1723 Sco as it continues to evolve, with observations of all types (visual, CCD/CMOS, DSLR, spectroscopy) and multiple bands as instrumentation permits. As the nova becomes fainter, beware of the magnitude 11.6 V star 12" to its NE when you do photometry. Frequency of observation depends on the rate of decline, but Dr. Fred Walter (Stony Brook University) recommends 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 continues to evolve, but, he adds, "you can't go wrong with a spectrum every clear night."
Observations reported to the AAVSO:
2024 Feb. 07.836 UT, <11.8 unfiltered (Y. Sakurai, Mito, Japan, CBET 5346);
07.84375, <12.3 (Andrew Pearce, Nedlands, W. Australia);
08.82778, 7.8 (Pearce);
09.692, 7.3 unfiltered (McNaught, using a 135-mm f/2.8 lens, CBET 5346);
09.836, 7.1 (Sakurai, Mito, Japan, discovery image, CBET 5346);
09.84375, 7.3 (Pearce, discovery image);
09.85625, 7.4 (Pearce);
10.38806, 4.126 I +/-0.006 (J.-F. Hambsch, remotely from Atacma, Chile);
10.38817, 4.083 I +/-0.006 (Hambsch);
10.38832, 7.588 V +/-0.004 (Hambsch);
10.38842, 7.601 V +/-0.004 (Hambsch);
10.38859, 9.272 B +/-0.004 (Hambsch);
10.38876, 9.279 B +/-0.004 (Hambsch);
10.38893, 6.139 R +/-0.004 (Hambsch);
10.38905, 6.183 R +/-0.004 (Hambsch);
10.762, 6.4 unfiltered (R. H. McNaught, Coonabarabran, NSW, Australia, using a Canon 6D all-sky camera (8-mm-f.l. f/2.8 lens, CBET 5346);
10.82083, 7.4 (Pearce);
10.83775, 7.214 TG (Pearce);
10.83888, 7.287 TG (Pearce);
10.83999, 7.305 TG (Pearce);
10.84097, 7.337 TG (Pearce);
10.84194, 7.314 TG (Pearce);
10.84285, 7.320 TG (Pearce);
10.84419, 7.270 TG (Pearce);
10.84583, 7.4 (Pearce);
10.84594, 7.382 TG (Pearce);
10.84685, 7.374 TG (Pearce);
10.84775, 7.344 TG (Pearce);
10.84866, 7.316 TG (Pearce);
10.84938, 7.326 TG (Pearce);
10.854, 5.8 unfiltered CCD (T. Noguchi, Katori, Japan, using a 0.23-m f/10 Schmidt-Cassegrain reflector, CBET 5346);
11.22917, 7.3 (A. Padilla Filho, Rio de Janeiro, Brazil);
11.25000, 7.2 (W. de Souza, São Paulo, Brazil);
11.27778, 7.5 (A. Amorim, Florianopolis, Brazil);
11.29000, 7.3 (J. Aguiar, Campinas, Brazil);
11.31944, 6.8 (L. Carmago da Silva, São Paulo, Brazil);
11.33542, 7.0 (N. Justino, São Paulo, Brazil);
11.33958, 6.8 (M. Coronel Rodríguez, Ñemby, Paraguay);
11.39238, 4.083 I +/-0.010 (Hambsch);
11.39247, 4.103 I +/-0.011 (Hambsch);
11.39257, 7.902 V +/-0.007 (Hambsch);
11.39265, 7.929 V +/-0.007 (Hambsch);
11.39280, 9.782 B +/-0.004 (Hambsch);
11.39298, 9.784 B +/-0.004 (Hambsch);
11.39312, 6.040 R +/-0.007 (Hambsch);
11.39321, 6.013 R +/-0.007 (Hambsch);
11.80625, 7.5 (Pearce);
11.84339, 7.617 TG (Pearce);
11.84476, 7.593 TG (Pearce);
11.84567, 7.587 TG (Pearce);
11.84657, 7.567 TG (Pearce);
11.84722, 7.5 (Pearce);
11.84750, 7.562 TG (Pearce);
11.85003, 7.559 TG (Pearce);
11.85120, 7.542 TG (Pearce);
11.85219, 7.553 TG (Pearce);
11.85313, 7.588 TG (Pearce);
11.85403, 7.579 TG (Pearce);
11.85494, 7.549 TG (Pearce);
11.85586, 7.561 TG (Pearce);
11.85675, 7.512 TG (Pearce);
11.85772, 7.520 TG (Pearce);
12.24306, 7.6 (Padilla Filho);
12.27920, 7.7 (Amorim);
12.28000, 7.4 (Aguiar);
12.30556, 7.5 (de Souza);
12.30972, 7.5 (Justino);
12.31736, 7.2 (Carmago da Silva);
12.32569, 7.3 (Coronel Rodríguez);
12.81597, 7.6 (Pearce);
12.86042, 7.6 (Pearce);
13.23958, 7.9 (Padilla Filho);
13.26042, 7.8 (de Souza);
13.31250, 7.7 (de Souza);
13.32639, 7.7 (Justino);
Charts: Charts with comparison stars for V1723 Sco may be created using the AAVSO Variable Star Plotter (VSP). As mentioned above, as the nova becomes fainter, beware of the magnitude 11.6 V star 12" to its NE when you do photometry.
Submit observations: Please submit observations using the name V1723 SCO.
- Submit optical observations to the AAVSO International Database using WebObs.
- Submit spectra to the AAVSO Spectroscopy Database (AVSpec).
Notes:
a. Designated PNV J17261813-3809354 when posted to the IAU Central Bureau for Astronomical Telegrams Transient Object Confirmation Page (TOCP) for this object.
b. E. Kazarovets reports that the permanent GCVS name V1723 Sco was assigned to this nova (CBET 5346, ed. D. W. E. Green).
c. A. Pearce reports the nova's position corresponds to that of Gaia-survey G-magnitude-19.4 star (Gaia DR3 5974053153713533184).
d. Image: T. Noguchi (2024 Feb. 10.854 UT, via CBET 5346): http://park8.wakwak.com/~ngc/images/PNVinSco_20240210.jpg
Congratulations to Andrew Pearce and Yukio Sakurai on their latest discoveries!
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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