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Bright outburst (14 mag), precise astrometry and time-resolved photometry is required!

TCP J06373299-0935420 (= ASASSN-19de)
Superoutburst of a WZ Sagittae-type dwarf nova:
Time-resolved photometry is required!

AAVSO Alert Notice 663

1SWASP J022916.91-395901.4 being observed with the Chandra X-ray Observatory (CXO)

8 March 2019Further to AAVSO Alert Notice 652, Dr. Koji Mukai (Goddard Space Flight Center) informs us that 1SWASP J022916.91-395901.4, one of the nova-like variables in his target list, will be observed with Chandra on 2019 March 11 22:35 UT – 2019 March 12 02:45 UT.

Knowing the status of the target is essential for interpreting the X-ray data. Dr. Mukai thanks observers for the observations they have already made of 1SWASP J022916.91-395901.4, and asks if more observations (a snapshot every night through March 12, and then every one to two nights) could be made between now and March 22. V filter is optimal. Visual observations are welcome. The V range of 1SWASP J022916.91-395901.4 is 12.8–16.7.

As Dr. Mukai wrote in Alert Notice 652, "We think we know how dwarf novae behave in X-rays, through various campaigns (famously that one on SS Cyg in outburst that Janet Mattei [and AAVSO observers] was heavily involved in, with Pete Wheatley and Chris Mauche, 2003MNRAS.345...49W): they are X-ray bright in optical quiescence, and fainter and softer in X-rays during outburst. In the optical, we think of nova-likes as systems in permanent outburst – but in X-rays, they don’t quite resemble dwarf novae in outburst. In fact, we haven’t seen a clear pattern, when we made X-ray observations of nova-like systems at various optical magnitudes. This Chandra program is part of an effort to look for patterns and to understand their X-ray emission."

Observers are reminded that occasional snapshots (again, V is preferred) are also needed of the remaining targets on the list given in Alert Notice 652 (LQ Peg, UU Aqr; KQ Mon, V378 Peg, and EC 21178-5417 have already been observed). Please see that Alert Notice for information on coordinates and magnitude ranges.

Coordinates (J2000.0) of 1SWASP J022916.91-395901.4: RA 02 29 16.95 Dec -39 59 01.7

Charts with a comparison star sequence for 1SWASP J022916.91-395901.4 may be created using the AAVSO Variable Star Plotter (VSP).

Please submit observations to the AAVSO International Database using the name 1SWASP J022916.91-395901.4.

AAVSO Forums: This campaign is the topic of the AAVSO Campaigns and Observation Reports forum thread

and the Cataclysmic Variables forum thread

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

The Z CamPaign

It’s all about the  standstills, those episodes where the star gets stuck at a mid-point between maximum and minimum. If it doesn’t exhibit standstills it isn’t a Z Cam star.

Data from Catalina Real Time Survey 

Drake et al. 2009, ApJ, 696, 87

Northern CVs brighter than 17th magnitude here.

Southern CV's brighter than 17th magnitude here.


Last updated 15:12 UT on 22 March 2019

New outbursts and unusual activity reported in the last 72 hours


TCP J06373299-0935420 # (rebrightening, see also 'Current superoutbursts' below)

PQ Aql :
IX Dra
SDSS J094002.56+274942.0

Current superoutbursts (since ...)
V359 Cen (20190314)
ASASSN-13bc (20190314) 
V1113 Cyg (20190313)
OGLE-BLG-DN-0254 (20190310; eclipsing, orbital period 0.07193083 d = 103.58040 min)
GZ Cnc (20190307)
V503 Cyg (20190307)
ASASSN-15dh (20190307)
CRTS J032839.9-010240 :# (20190222; time-resolved photometry is required)
TCP J06373299-0935420 # (20190221; UGWZ, Psh= 0.06687(5) d); rebrightening 20190321)
NSV 1440 # (20190216; AM CVn type, short rebrightenings 20190225, 0302 and 0318)
V386 Ser # (20190118; UGWZ, 10.4 mag, rebrightenings 20190216, 18, 20, 23, ...)
ASASSN-19ag (20190107, short rebrightening 20190225)

Z Cam-type dwarf novae at standstill
1RXS J062954.6-033520 (since 20190228)
AT Cnc (since 20190212)
Z Cam (since 20181012)

# indicates a noteworthy or unusual outburst
:  indicates confirmation required
'Activity At A Glance' is gleaned from observations reported to AAVSO MyNewsFlash, BAAVSS-Alert, CVnet-Outburst, VSObs-share and VSNET-outburst. We sincerely thank all the observers who contribute timely observations and reports of activity to these email lists.


Updated 17 January 2019

For new papers on CV's see astro-ph

Taichi Kato (Kyoto U), Elena P. Pavlenko, Nikolaj V. Pit, Kirill A. Antonyuk, Oksana I. Antonyuk, Julia V. Babina, Aleksei V. Baklanov, Aleksei A. Sosnovskij, Sergey P. Belan, Yutaka Maeda, Yuki Sugiura, Sho Sumiya, Hanami Matsumoto, Daiki Ito, Kengo Nikai, Naoto Kojiguchi, Katsura Matsumoto, Pavol A. Dubovsky, Igor Kudzej, Tomas Medulka, Yasuyuki Wakamatsu, Ryuhei Ohnishi, Takaaki Seki, Keisuke Isogai, Andrii O. Simon, Yaroslav O. Romanjuk, Alexsandr R. Baransky, Aleksandr V. Sergeev, Vira G. Godunova, Inna O. Izviekova, Volodymyr A. Kozlov, Aleksandr S. Sklyanov, Roman Ya. Zhuchkov, Alexei G. Gutaev, Vasyl O. Ponomarenko, Volodymyr V. Vasylenko, Ian Miller, Kiyoshi Kasai, Shawn Dvorak, Kenneth Menzies, Enrique de Miguel, Stephen M. Brincat, Roger D. Pickard

Keisuke Isogai, Taichi Kato, Akira Imada, Tomohito Ohshima, Naoto Kojiguchi, Ryuhei Ohnishi, Franz-Josef Hambsch, Berto Monard, Seiichiro Kiyota, Hideo Nishimura, Daisaku Nogami

G. Ramsay, M. J. Green, T. R. Marsh, T. Kupfer, E. Breedt, V. Korol, P.J. Groot, C. Knigge, G. Nelemans, D. Steeghs, P. Woudt, A. Aungwerojwit

Luis Alberto Canizares, Peter Garnavich, Colin Littlefield, Joshua Pepper, Allyson Bieryla, Supachai Awiphan, Siramas Komonjinda

Anna F. Pala, Linda Schmidtobreick, Claus Tappert, Boris T. Gänsicke, Andrea Mehner

G. J. M. Luna, K. Mukai, J. L. Sokoloski, T. Nelson, P. Kuin, A. Segreto, G. Cusumano, M. Jaque Arancibia, N. E. Nunez

Mariko Kimura et al

M. J. Darnley, S. Starrfield

Mariko Kimura, Keisuke Isogai, Taichi Kato, Kenta Taguchi, Yasuyuki Wakamatsu, Franz-Josef Hambsch, Berto Monard, Gordon Myers, Shawn Dvorak, Peter Starr, Stephen M. Brincat, Enrique de Miguel, Joseph Ulowetz, Hiroshi Itoh, Geoff Stone, Daisaku Nogami

Joseph Patterson et al.

Paula Szkody, Mark E. Everett, Zhibin Dai, Donald Serna-Grey

John R. Thorstensen, Frederick A. Ringwald, Cynthia J. Taylor, Holly A. Sheets, Christopher S. Peters, Julie N. Skinner, Erek H. Alper, Kathryn E. Weil

Mariko Kato (Keio Univ.), Izumi Hachisu (Univ. of Tokyo), Hideyuki Saio (Tohoku Univ.)

E. Aydi, K. L. Page, N. P. M. Kuin, M. J. Darnley, F. M. Walter, P. Mróz, D. Buckley, S. Mohamed, P. Whitelock, P. Woudt, S. C. Williams, M. Orio, R. E. Williams, A. P. Beardmore, J. P. Osborne, A. Kniazev, V. A. R. M. Ribeiro, A. Udalski, J. Strader, L. Chomiuk

Michael M. Shara, Trisha F. Doyle, Ashley Pagnotta, James T. Garland, Tod R. Lauer, David Zurek, Edward A. Baltz, Ariel Goerl, Attay Kovetz, Tamara Machac, Juan Madrid, Joanna Mikolajewska, J. D. Neill, Dina Prialnik, Doug L. Welch, Ofer Yaron

J.M Hameury & J.P Lasota

V. V. Lukin, K. L. Malanchev, N. I. Shakura, K. A. Postnov, V. M. Chechetkin, V. P. Utrobin

Authors: A. F. Pala, B. T. Gänsicke, D. Townsley, D. Boyd, M. J. Cook, D. De Martino, P. Godon, J. B. Haislip, A. A. Henden, I. Hubeny, K. M. Ivarsen, S. Kafka, C. Knigge, A. P. LaCluyze, K. S. Long, T. R. Marsh, B. Monard, J. P. Moore, G. Myers, P. Nelson, D. Nogami, R. Pickard, G. Poyner, D. E. Reichart, D. Rodriguez Perez, M. R. Schreiber, J. Shears, E. M. Sion, R. Stubbings, P. Szkody, M. Zorotovic

Liam K Hardy, Martin J McAllister, Vik S Dhillon, Stuart P Littlefair, Madelon C P Bours, Elme Breedt, Tim Butterley, Anurak Chakpor, Puji Irawati, Paul Kerry, Tom R Marsh, Steven G Parsons, Chris D J Savoury, Richard W Wilson, Patrick A Woudt