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Name
  ASASSN-19nl  
AAVSO UID
000-BNC-650 (461 observations)  
Constellation
Cygnus Sequence
J2000.0
21 38 49.66 +42 12 23.6  (324.70692 +42.20656) Search nearby
B1950.0 21 36 51.02 +41 58 48.1
Galactic coord. 89.099 -7.671
Other names

(Internal only)
1RXS J213851.0+421213 2MASS J21384966+4212236 2RXS J213851.0+421212
AllWISE J213849.70+421223.7 CMC15 J213849.8+421223 GSC2.3 N31D039792
GSC2.3 N31D107525 PSO J213849.665+421223.663 USNO-A2.0 1275-16194419
USNO-B1.0 1322-0520760 WISE J213849.70+421223.8  
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Variability type
UG
Spectral type --
Mag. range
14.4 - 18.2 g
Discoverer ASAS-SN
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Schmeer, Patrick Astrometry obtained on 2019 May 28.985 UT (21 38 49.68 +42 12 23.7; observer G. Wells, measurer D. Bamberger, personal communication) confirms that the outbursting object is indeed PSO J213849.665+421223.663 and not the close companion.
2 Schmeer, Patrick VSP Note: 17.8 Vmag. star 3" to the E.
3 Schmeer, Patrick Gaia DR2 parallax 0.7261 0.0875 mas (distance 1.3 0.2 kpc). The ASAS-SN Sky Patrol recorded between 2014 Dec. 16 and 2019 May 24 two outbursts: on 2016 June 20 and on 2019 May 22. ASAS-SN data contaminated by Gaia DR2 1966829150207515776 (V= 17.8; sep. 3") and partially contaminated by 2MASS J21384838+4212171 (V= 13.8; sep. 16"). Maximum magnitude has been corrected.
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References
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1 Kochanek, C. S.; et al., 2017, The All-Sky Automated Survey for Supernovae
(ASAS-SN) Light Curve Server v1.0
2017PASP..129j4502K
2 ASAS-SN Transients (Shappee et al., 2014) 2014ApJ...788...48S
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Revision History
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1 Schmeer, Patrick 2019-05-24 20:52 UTC Gaia DR2 position. Maximum magnitude from ASAS-SN data. Minimum magnitude from Pan-STARRS1.