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AAVSO Alert Notice 489: Nova Delphini 2013 = PNV J20233073+2046041

August 16, 2013

Event: Nova Del 2013 = PNV J20233073+2046041

Discovered by: Koichi Itagaki (Teppo-cho, Yamagata, Japan), reported by S. Nakano (Sumoto, Japan)

Discovery Magnitude: unfiltered CCD magnitude mag 6.8 using a 0.18-m reflector

Discovery date: 2013 Aug. 14.584 UT

Coordinates: R.A. 20 23 30.73  Decl. +20 46 04.1  (2000.0)

Spectra: Spectra by numerous professional and amateur astronomers show strong H-alpha and H-beta emission and P Cygni profile emission lines, all pointing to a pre-maximum classical nova. For details on spectra, see CBET 3628 and the IAU Circular to be announced shortly. Postings to the AAVSO Spectroscopy Forum (http://www.aavso.org/forums/variable-star-observing/spectroscopy) also contain information on spectra, as well as observing and reporting instructions for spectroscopists.

Charts: Charts for Nova Del 2013 may be created using the AAVSO Variable Star Plotter (VSP) at http://www.aavso.org/vsp. We have created a binocular sequence for this nova that can be plotted using the Binocular Chart option on VSP. For best results specify a field of view of 900 arc minutes (15 degrees) and a limiting magnitude of 7 and click on the Binocular Chart option. This will produce an uncluttered chart with a sequence from 6.9 to 3.5V for use with binoculars.

Observations reported to the AAVSO: Over 750 observations have been reported to the AAVSO since the discovery of Nova Del 2013. For a complete, up-to-the-minute listing of observations, go to the AAVSO website homepage (http://www.aavso.org), enter Nova Del 2013 into the Star Finder feature, and click on 'Check recent observations'. Representative observations, including prediscovery ones, include:

CCD observations:
2013 May 13.998, 17.1 unfiltered (D. Denisenko et al., double 0.40-m f/2.5 robotic MASTER-Kislovodsk reflector, Russia; via CBET 3628);
Aug. 13.565, <13.0 (Itagaki; via CBET 3628);
13.95486, <10.2 CV (MGAB, G. Murawski, Suwalki, Poland);
14.8, 6.8 unfiltered (E. Guido, N. Ruocco, and N. Howes, remotely using a 0.43-m f/6.8 astrograph near Nerpio, Spain; via CBET 3628);
14.8, 6.1 R (Guido et al.; 0.25-m f/6.3 telescope at Sorrento, Italy; via CBET 3628);
14.8, 6.9 unfiltered (Guido et al., Sorrento; via CBET 3628);
14.802, 6.4 R (S. Shurpakov, Baran, Belarus; via CBET 3628);
14.81700, 6.5 CV (SIV, I. Sergey, Molodechno, Belarus);
14.87207, 6.428 V +/-0.028 (HPIA, P. Hallsten, Vasterhaninge, Sweden);
14.87643, 6.432 B +/-0.004 (CLZ,  L. Corp, Rodez, France);
14.87736, 6.108 V +/-0.002 (Corp);
14.87812, 5.680 R +/-0.002 (Corp);
14.90647, 6.489 V +/-0.028 (Hallsten);
14.92293, 5.617 R +/-0.005 (ILUA, L. Izzo, Rome, Italy);
14.92293, 6.103 V +/-0.005 (Izzo);
14.92293, 6.773 B +/-0.005 (Izzo);
14.94930, 6.3 CV +/-0.008 (KTHA, T. Karlsson, Varberg, Sweden);
15.14916, 5.876 V +/-0.004 (CMJA, M. Cook, Newcastle, ON, Canada);
15.14895, 6.045 B +/-0.009 (Cook);
15.83727, 5.352 B +/-0.013 (WTHB, T. Wikander, Borlange, Sweden);
15.84440, 5.129 V +/-0.046 (VOL, W. Vollmann, Vienna, Austria);
15.86870, 5.097 CV +/-0.008 (Karlsson);
15.88326, 5.127 V +/-0.01 (SBX, A. Sonka, Bucharest, Romania);
16.03739, 4.60 I +/-0.02 (GKOA, K. Gazeas, Athens, Greece
16.03531, 4.71 R +/-0.04 (Gazeas);
16.03344, 4.80 V +/-0.04 (Gazeas);
16.03143, 4.97 B +/-0.03 (Gazeas);
16.27911, 4.445 V +/-0.008 (OAR, A. Oksanen, Muurame, Finland);
16.27804, 4.820 B +/-0.021 (Oksanen);
J. Blackwell (BKL, Exeter, NH) has 24 V obs, 8 B obs, Aug. 15.14015 at 5.858 V +/-0.002 through Aug. 15.15550 at 5.849 V +/-0.004.
K. Graham (GKA, Manhattan, IL) has 267 V observations Aug. 15.18369 at 5.866 +/-0.009 through Aug. 15.18347 at 5.873 +/-0.009.
A. Van Der Hoeven (HAGA, HI-Ambacht, Netherlands) has 166 V observations Aug. 14.93736 at 6.3070 +/-0.0072 through Aug. 15.88907 at 5.1284 +/-0.0038.

visual observations:
2013 Aug. 14.829 UT, 6.0 (SPK, P. Schmeer, Bischmisheim, Germany)
14.87847, 6.3 (WAU, A. Wargin, Bydgoszcz, Poland);
14.88194, 6.3 (MUY, E. Muyllaert, Oostende, Belgium);
14.88472, 6.6 (WLP, P. Wils, Hever, Belgium);
14.89236, 6.1 (GPIA, P. Guzik, Krosno, Poland);
14.91459, 6.5 (VSD, D. Vansteelant, Varsenare, Belgium);
14.91528, 6.3 (BOS, E. Broens, Mol, Belgium);
14.94722, 6.2 (TTU, T. Tezel, Kukurtlu, Turkey);
14.94790, 6.4 (KTHA, T. Karlsson, Varberg, Sweden);
14.99930, 6.1 (GZN, A. Glez-Herrera, Ferrol, Spain);
15.08333, 6.0 (MCLA, C. Muir, Canada);
15.12780, 5.8 (PKV, K. Paxson, Centerville, OH);
15.14310, 5.7 (BRJ, J. Bortle, Stormville, NY);
15.17847, 5.5 (HUZ, R. Huziak, Saskatoon, SK, Canada);
15.20556, 5.7 (SGE, G. Sarty, Saskatoon, SK, Canada);
15.20833, 5.4 (WGE, G. Ward, Flemington, WV);
15.25833, 5.5 (LMK, M. Linnolt, Ocean View, HI);
15.26597, 5.6 (MCPA, C. Maloney, Helena, AR);
15.29650, 5.8 (KMA, M. Komorous, London, ON, Canada);
15.31319, 5.8 (BJS, J. Bedient, Honolulu, HI);
15.38403, 5.6 (SLH, L. Shotter, Uniontown, PA);
15.39028, 5.9 (WCG, C. Wyatt, Walcha, NSW, Australia);
15.41736, 5.9 (MTH, H. Matsuyama, Kanimbla, QLD, Australia);
15.56244, 5.6 (BDJB, D. Benn, Klemzig, SA, Australia);
15.57292, 5.5 (PEX, A. Pearce, Nedlands, WA, Australia);
15.65972, 5.5 (CMQ, P. Camilleri, Warners Bay, NSW, Australia);
15.77917, 5.2 (GBZ, O. Gabzo, Givatayim, Israel);
15.80556, 5.0 (NLZ, L. Nemeth, Petfurdo, Hungary);
15.80900, 5.3 (BSR, S. Baroni, Milan, Italy);
15.81944, 5.2 (MVH, V. Mihai, Bucharest, Romania);
15.82292, 5.1 (KAM, A. Kammerer, St. Leon-Rot, Germany);
15.83300, 5.0 (BQ, L. Bartha, Budapest, Hungary);
15.83681, 5.1 (BLD, D. Blane, Henley-on-Klip, South Africa);
15.84167, 5.0 (MVO, V. Makela, Helsinki, Finland);
15.85694, 5.17(BISA, I. Bryukhanov, Minsk, Belarus);
15.86458, 5.0 (GGU, G. Gilein, Noordwijk, Netherlands);
15.87500, 5.1 (LMT, M. Legutko, Gliwice, Poland);
15.89580, 5.0 (PLP, L. Palazzi, Genova, Italy);
15.89931, 4.9 (VNL, F. Van Loo, Genk, Gelgium);
15.90139, 4.8 (RFC, F. Rodriguez Bergali, Seville, Spain);
15.90903, 5.1 (CUU, J. Curto Amigo, Maliano, Spain);
15.91319, 5.0 (AAX, A. Amorim, Florianopolis, Brazil);
15.91667, 5.0 (HEY, B. Heyndricks, Zwijnaarde, Belgium);
15.92560, 5.1 (BTAD, T. Banys, Lodz, Poland);
15.93750, 5.0 (ACN, C. Adib, Porto Alegre, Brazil);
15.95139, 5.1 (SROC, R. Szaj, Rybno, Poland);
15.96875, 5.1 (RVR, V. Ruiz, Spain);
15.98889, 5.1 (MGAB, G. Murawski, Suwalki, Poland);
16.03125, 5.0 (GPMA, P. Gray, Greenwood, NS, Canada);
16.03403  4.9 (ONJ, J. O'Neill, Rush, Ireland);
16.04583, 5.0 (HQA, A. Henden, Cambridge, MA);
16.05000, 4.8 (DSJ, J. De Souza Aguiar, Campinas, Brazil);
16.06110, 4.9 (Bortle);
16.06528, 4.9 (BSJ, S. Beck, Topsfield, MA);
16.07639, 4.8 (Muir);
16.09167, 4.6 (TYS, R. Tyson, Freeport, NY);
16.10903, 4.9 (TBA, A. Tekatch, Hamilton, ON, Canada);
16.12361, 4.9 (SXN, M. Simonsen, Imlay City, MI);
16.13540, 4.8 (BTB, T. Bretl, Plymouth, MN);
16.14583, 4.7 (STI, P. Steffey, Daytona Beach, FL);
16.16611, 4.6 (ZQIA, Q. Zhang, Lake Elsinore, CA);
16.18540, 4.7 (Paxson);
16.23056, 4.7 (RBK, B. Ramotowski, Tijeras, NM);
16.27778, 4.6 (Bedient);
16.28958, 4.5 (Maloney);
16.34722, 4.4 (Linnolt);
16.36458, 4.4 (BMI, M. Brewster, Dripping Springs, TX);
16.39236, 4.4 (Wyatt);
16.50139, 4.5 (SANG, A. Sing, Makati City, Philippines);
16.52083, 4.5 (MMIK, M. Matessa, Ben Lomond, CA);
16.56458, 4.3 (ONOA, N. Ohuo, Hiroshima, Japan);
16.61389, 4.4 (Pearce);
16.79861, 4.6 (RZM, M. Rzepka, Krosno, Poland);
16.80278, 4.7 (Nemeth);
16.80903, 4.56 (PMAA, M. Pirtac, Onesti, Romania);
16.81320, 4.5 (Baroni);
16.81736, 4.4 (Sergey);
16.82290, 4.7 (Palazzi);
16.82639, 4.5 (SSW, S. Swiercyznski, Dobczyce, Poland);
16.83333, 4.6 (WTHA, T. Will, Rednitzhembach, Germany);
16.83542, 4.8 (TUO, U. Tagliaferri, Collepardo, Italy);
16.84028, 4.5 (PGC, G. Pappa, Mascalucia, Sicily, Italy);
16.84400, 4.7 (MPR, P. Maurer, Bad Friedichshall, Germany);
16.84722, 4.6 (GOC, R. Grochoswski, Swidnica, Poland);
16.86250, 4.5 (WNBA, N. Wakefield, Highbridge, England);
16.86458, 4.6 (Makela);
16.90278, 4.4 (JDAA, D. Jakubek, Smardzowice, Poland);

Submit observations: Please submit observations to the AAVSO International Database using the name NOVA DEL 2013 until a GCVS name is assigned and announced.

Notes:
a. Announced on IAU CBAT Central Bureau Electronic Telegram 3628 (Daniel W. E. Green, ed.).

b. Nova Del 2013 was designated PNV J20233073+2046041 when it was posted on the CBAT TOCP webpage (http://www.cbat.eps.harvard.edu/unconf/tocp.html).

c. Confirmed by Itagaki on unfiltered images taken with a 0.60-m f/5.7 reflector on Aug. 14.750 that show the variable at mag 6.3.

d. Itagaki posted his discovery image at http://www.k-itagaki.jp/images/pnv-del.jpg.

e. P. Schmeer (Bischmisheim, Germany) reports a star of blue magnitude 17 (16.86 V, from The Guide Star Catalogue, Version 2.3.2) located about 0.3" from the position of the nova at position end figures 30.714s, 04.22". Denisenko et al. suggest that the variable is identical to the blue star USNO-B1.0 1107-0509795 (position end figures 30.713s, 03.97"; blue mag 17.2- 17.4, red mag 17.4-17.7) and to the ultraviolet source GALEX J202330.7+204603 (NUV magnitude 17.9); their color-combined (BRIR) Digitized Sky Survey finder chart posted at http://master.sai.msu.ru/static/OT/J202330+204604-BRIR5x5.jpg (field-of-view 5' x 5') has the proposed precursor marked. (CBET 3628)

f. References to multiple images and position end figures are given in CBET 3628.

Congratulations to Koichi Itagaki on his latest discovery!


This AAVSO Alert Notice was prepared by Elizabeth O. Waagen.

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