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Name
  ASASSN-19xw  
AAVSO UID
000-BNG-866 (890 observations)  
Constellation
Vulpecula Sequence
J2000.0
19 19 00.42 +25 03 32.0  (289.75175 +25.05889) Search nearby
B1950.0 19 16 56.08 +24 57 57.6
Galactic coord. 58.305 +5.531
Other names

(Internal only)
AT 2019rki    
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Variability type
UGWZ
Spectral type --
Mag. range
14.9 - <23 g
Discoverer ASAS-SN
Epoch
29 Sep 2019 (HJD 2458755.73)
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Schmeer, Patrick Unfiltered time-series runs, made on seven consecutive nights from 2019 Sept. 29.8 UT (JD = 2458756.3), did not reveal any periodic variation with an amplitude > 0.02 magnitudes down to 50 cycles/day (2019ATel13180...1L). Subsequently, superhumps with an amplitude of 0.28 mag and a period of 0.057(2) d were detected 2019 Oct. 17–21 (vsnet-alert 23650, 2019ATel13225....1L). Spectroscopy on 2019 Oct. 12 revealed strong, narrow H-alpha emission on top of broader H-alpha absorption and Balmer absorption lines, consistent with that of a dwarf nova in outburst (J. Rupert, TNS). The epoch is for the optical peak of the 2019 superoutburst.
2 Otero, Sebastian Alberto ASAS-SN magnitudes contaminated by 2MASS J19190095+2503293 (V= 18.4; g= 19.0; sep. 9"); 2MASS J19190006+2503240 (V= 17.6; g= 18.3; sep. 9") and 2MASS J19185981+2503255 (V= 18.3; g= 18.8; sep. 10"). Range has been corrected.
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References
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1 C. Lloyd; T. Vanmunster, 2019, ATel #13225 2019ATel13225....1L
2 C. Lloyd; T. Vanmunster, 2019, ATel #13180 2019ATel13180....1L
3 Transient Name Server, 2019 (online data) --
4 T. Kato, 2019, vsnet-alert #23657 --
5 T. Vanmunster, 2019, vsnet-alert #23650 --
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Images
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Supporting Documents
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Revision History
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2 Schmeer, Patrick 2019-10-11 16:12 UTC Type from vsnet-alert 23650, 2019ATel13225....1L, and vsnet-alert 23657. Position based on astrometry by T. Vanmunster (personal communication). "Eruption" year deleted.
1 Otero, Sebastian Alberto 2019-09-30 21:56 UTC Approximate minimum magnitude from Pan-STARRS1 Aladin image.

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