[vsnet-alert 25842] CH UMa outburst (since May 8)

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

 CH Ursae Majoris (UGSS)
Orbital period: 0.343184 d (8.2364 h)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=37213
 
AAVSO data:
https://app.aavso.org/webobs/results/?star=CH+UMa
 
ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF18aabjlca/
 
Recent ASAS-SN Sky Patrol light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/50f1b311-fa69-4ba9-8a41-e3452ac28d2d
 
The two most recent outbursts occurred from 2019 June 19 to 28
and from 2020 June 24 to July 11.

Clear skies,
Patrick
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References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
- Shappee et al., 2014ApJ...788...48S
- Kochanek et al., 2017PASP..129j4502K
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M
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Bagó Balázs wrote (cvnet-outburst message "Activity 2021MAY08"):

Balazs Bago (BOZ) - Hungary
Visual observations for 2021MAY08
AUR SS      20210508,783  11.7    Active
CNC SY      20210508,788  11.8    Active
CRB VW      20210508,863  14.7    Active
LEO IU      20210508,817  14.9    Fading
LYR LL      20210508,868  13.7    Active
UMA CH      20210508,845  12.9    Outburst
UMA ER      20210508,797  12.9    Active
VIR TW      20210508,822  14.9  Active
Instrument: 355/1600 Dobson
Sequences : AAVSO
Conditions: Good transparency