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ASASSN-19mo: classical nova (13.0 mag) in Scorpius
https://www.aavso.org/asassn-19mo-classical-nova-130-mag-scorpius



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 https://www.aavso.org/six-novalikes-2018-campaign

and the Cataclysmic Variables forum thread https://www.aavso.org/six-novalikes-2018-campaign-01

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.



ACTIVITY AT A GLANCE

Last updated 18:52 UT on 22 May 2019

New outbursts and unusual activity reported in the last 72 hours

YYYYMMDD

20190522
DM CMa
FQ Sco

20190521
QZ Vir = T Leo (superoutburst, precursor on 20190512)
KS UMa

20190520
SV CMi
ST Cha
DT Oct
UY Pup
BX Pup
CL Pup
DV TrA
HS Vir
ASASSN-14je


Current superoutbursts (since ...)
QZ Vir = T Leo (20190521; precursor on 20190512)
CI Gru (20190515)
IY UMa (20190427; eclipsing, orbital period 0.07390897 d)
ASASSN-13at (20190427; superhump period 0.0892(10) d)
EC 05200-5205 = DDE 76 (20190425, precursor outburst 20190418; ER UMa subtype)
MASTER OT J051529.15+560532.0 (20190415, superhump period 0.0716(19) d)
AL Com # (20190414; 
UGWZ, time-resolved photometry is required)


Z Cam-type dwarf novae at standstill
AT Cnc (since 20190212)
Z Cam (since 20181012)
1RXS J062954.6-033520 (20190228–20190316)
UY Pup (20181129–20181217)


# 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.

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