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.
New outbursts and unusual activity reported in the last 5 days
YYYYMMDD
20251217
CZ Ori
AR Pic
BX Pup
MASTER OT J162323.48+782603.3
20251216
SY Cnc
AA Oct
CN Ori
BV Pup
HO Pup
VZ Pyx
VW Tuc
ASASSN-14ff
20251215
MASTER OT J003831.10-640313.7
20251213
BI Ori
# indicates a noteworthy or unusual activity
: indicates confirmation required
* indicates time-resolved photometry required
ASASSN-25eq: new WZ Sge-type dwarf nova, likely a period bouncer.
VSNET-ALERT 28130
November 27, 2025
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AAVSO Alert Notice - Observing Campaign #907
Nova in Sgr: V7994 Sgr (N Sgr 2025 No. 4 = TCP J18035290-3127298 = TCP J18035278-3127240)
September 24, 2025
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AAVSO Alert Notice - Observing Campaign #906
Nova in Cen: V1935 Cen (N Cen 2025 = PNV J14372177-5847400)
September 24, 2026
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AAVSO Alert Notice - Observing Campaign #904
Photometry requested for DDE 155 (ZTF18abmbdyk)
August 8, 2025
For new papers on CVs see arxiv.org astro-ph
Updated December 16, 2025
WZ Sge-type dwarf novae: an extreme laboratory in cataclysmic variables.
Yusuke Tampo
Challenging historical novae: AT Cnc (1645), Te-11 (483), and M22 (BC 48) revisited.
D.L. Neuhäuser, R. Neuhäuser, V. Hambaryan (U Jena), J. Chapman (Society for the Study of Early China), M. Della Valle (INAF Napoli)
Outbursts in ultra-compact AM CVn binaries
Gavin Ramsay
A study of transients from ground-based surveys reveals new
Jan Kára, Liliana Rivera Sandoval, Wendy Mendoza, Thomas J. Maccarone, Manuel Pichardo Marcano, Luis E. Salazar Manzano, Ryan J. Oelkers, and Jan van Roestel
TESS and ground-based observations of WZ Sge-type dwarf novae in outburst
Y. Tampo, N. Kojiguchi, K. Isogai, D. Nogami, H. Itoh, F.-J. Hambsch, K. Matsumoto, R. Matsumura, D. Fujii, T. Tordai, Y. Sano, B. Monard, P.A. Dubovsky, T. Medulka, D.A.H. Buckley, N. Rawat, S.B. Potter, A. van Dyk, P.J. Groot, P. Woudt, S. Kiyota, G. Bolt, T. Vanmunster, J. Pietz, P. Starr, S.Y. Shugarov, K. Kasai, K. Menzies, S.M. Brincat, E.P. Pavlenko, A. Baklanov, J. Ito, T. Kato
A Bow-Shock Nebula Around the Z Camelopardalis-type Cataclysmic Variable FY Vulpeculae
Howard E. Bond, Calvin Carter, Eric Coles, Peter Goodhew, Jonathan Talbot, Gregory R. Zeimann
The Silent Majority: The Interacting Post-Common-Envelope Binaries Underlying Cataclysmic Variables
Yarin Meir Shani, Na'ama Hallakoun, Sagi Ben-Ami, Sahar Shahaf, Jiadong Li, Hans-Walter Rix, Silvia Toonen
The orbital period changes for novae
Wenshi Tang, Xiangdong Li, Bo Wang
GOTO065054+593624: a 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers
T. L. Killestein, G. Ramsay, M. Kennedy, L. Kelsey, D. Steeghs, S. Littlefair, B. Godson, J. Lyman, M. Pursiainen, B. Warwick, C. Krawczyk, L. K. Nuttall, E. Wickens, S. D. Alexandrov, C. M. da Silva, R. Leadbeater, K. Ackley, M. J. Dyer, F. Jiménez-Ibarra, K. Ulaczyk, D. K. Galloway, V. S. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, E. Pallé, D. Pollacco, A. Kumar, D. O'Neill, T. Butterley, R. Wilson, S. Mattila, A. Sahu, R. Starling, C. Y. Wang, Q. Liu, A. Li, Z. Dai, H. Feng, W. Yuan, R. Billington, A. G. Bull, S. Gaudenzi, V. Gonano, H. Krawczyk, M. T. Mazzucato, A. Pasqua, J. A. da Silva Campos, M. Torres-Guerrero, N. N. Antonov, S. J. Bean, E.T. Boeneker, S. M. Brincat, G. S. Darlington, F. Dubois, F.-J. Hambsch, D. Messier, A. Oksanen, G. Poyner, F. D. Romanov, I. D. Sharp, T. Tordai, T. Vanmunster, K. Wenzel
Hot donors in cataclysmic variables: The case of EI Psc
J. Kára, S. Zharikov, M. Wolf, N. Vaidman, A. Agishev, S. Khokhlov, C.E. Chavez
A 70 pc-Diameter Nova Super-remnant Surrounding the Recurrent Nova RS Ophiuchi
Michael M. Shara, Kenneth M. Lanzetta, Alexandra Masegian, James T. Garland, Stefan Gromoll, Alexei Kniazev, Lee Townsend, David Zurek, Joanna Mikolajewska, David Valls-Gabaud, Frederick M. Walter, John K. Webb
CV artwork courtesy Darren Baskill