ASASSN-21nv (UGWZ:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2223860
ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF21abouwjj/
Recent ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/dc7c9a1a-df53-4dd2-8866-99e32…
The (super?)outburst started on 2021 July 27. A rapid fading&…
[View More]nbsp;began on August 23.
Short rebrightenings were recorded on August 27 and 30, and on September 2 and 4.
(according to ZTF, ATLAS and ASAS-SN data)
Time-resolved photometry was performed by Tonny Vanmunster (VMT) during six
observing sessions (July 30 - Aug. 3 and Aug. 10 UT); no superhumps were detected:
https://app.aavso.org/webobs/results/?star=ASASSN-21nv
Follow-up observations are encouraged.
Clear skies,
Patrick
-------
References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
- Shappee et al., 2014ApJ...788...48S
- Kochanek et al., 2017PASP..129j4502K
Asteroid Terrestrial-impact Last Alert System (ATLAS):
- Tonry et al., 2018PASP..130f4505T
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M
[View Less]
MASTER OT J052622.61+734629.7: new SU UMa-type dwarf nova
Tamas Tordai and Josch Hambsch have reported observations.
The object shows superhumps with a period of 0.06549(4) d
and an amplitude of 0.28 mag.
ASASSN-21qi: new SU UMa-type dwarf nova
Berto Monard has reported observations. The object
has been showing superhump (amplitude 0.18 mag)
since Aug. 26. The period is 0.06141(2) d allowing
aliases (alias still not selected due to the limited
coverage).
Dear colleagues,
I have just finished analysing my unfiltered observations of TCP
J19092450+3041330, obtained on 2021, September 04/05 at CBA Belgium
Observatory (0.40-m f/10.0 telescope, QHY-268M CMOS, clear then clouds) and
at CBA Extremadura Observatory (0.40-m f/5.1 telescope, SX-46 CCD, clear
skies).
Combining both observation sets, regular superhumps with an amplitude of
0.40 mag are clearly visible in the resulting light curve, establishing TCP
J19092450+3041330 as a new SU UMa-type …
[View More]dwarf nova. A period analysis using
the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso
3.0), yields a combined superhump period of 0.0680 +/- 0.0002d. The object
was at mag CV = 16.1 on Sep 05th.
I will send my observations to AAVSO, CBA and VSNET for further analysis.
Best regards
Tonny
---
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com
[View Less]
SDSS J172102.48+273301.2 (AM CVn star)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=233123
The second part of the current double superoutburst began on
(or shortly before) September 3, according to ZTF (and ATLAS) data:
https://lasair.roe.ac.uk/object/ZTF21abvdxkq/
The 2012 superoutburst had started between May 27 and June 5
(Denis Denisenko, vsnet-alert 14657).
Time-resolved photometry during the current superoutburst is required.
Clear skies,
Patrick
--------------------
…
[View More]Naoto Kojiguchi wrote on Friday, 3 September 2021 at 17:22:22 UTC:
SDSS J172102.48+273301.2: AM CVn object with double superoutburst
Taguchi-san has reported the latest outburst of this object detected by ZTF alert.
This object will soon show a second superoutburst.
SC ~ 9.3 yr.
Time-resolved photometry is required.
YYYYMMDD(UT) mag observer comment
20210825.323 <16.677g ASN
20210826.196 15.852zr ZLR Start of outburst
20210826.217 15.659g ASN
20210827.277 16.078o ATF
20210827.319 15.813g ASN
20210828.195 15.757zg ZLR
20210828.211 15.764g ASN
20210828.258 16.124zr ZLR
20210829.044 15.935g ASN
20210829.275 16.140cy ATF
20210830.751 <16.748g ASN Start of dip
20210831.208 19.372zg ZLR
20210831.333 19.748o ATF
ATF (ATLAS Forced Photometry (Tonry et al. 2018))
ASN (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
ZLR (Zwicky Transient Facility Lasair (Masci+ 2019))
[View Less]
Dear colleagues,
I have just finished analysing my unfiltered CMOS observations of MASTER OT
J052622.61+734629.7, obtained on 2021, September 03/04 at CBA Belgium
Observatory, using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under
clear skies.
Regular superhumps with an amplitude of 0.29 mag are clearly visible in the
resulting light curve, establishing MASTER OT J052622.61+734629.7 as a new
SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle,
Generalized-Lomb-…
[View More]Scargle and PDM methods (Peranso 3.0), yields a combined
superhump period of 0.0665 +/- 0.0003d. The object was at mag CV = 16.2 on
Sep 04th.
I will send my observations to AAVSO, CBA and VSNET for further analysis.
Best regards
Tonny
---
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com
[View Less]