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Name
  V2891 Cyg  
AAVSO UID
000-BNG-814 (1879 observations)  
Constellation
Cygnus Sequence
J2000.0
21 09 25.53 +48 10 52.2  (317.35638 +48.18117) Search nearby
B1950.0 21 07 42.42 +47 58 37.5
Galactic coord. 89.597 +0.214
Other names

(Internal only)
AT 2019qwf Gaia19ext N Cyg 2019
Nova Cyg 2019 Nova Cygni 2019 PGIR 19brv
PGIR19brv PNV J21092550+4810534 PSO J210925.535+481052.332
UGPS J210925.52+481052.3 ZTF19abyukuy  
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Variability type
NB
Spectral type --
Mag. range
14.3 - <22 V
Discoverer Palomar Gattini-IR (PGIR) collaboration
Epoch
29 Nov 2019 (HJD 2458817)
Outburst 2019
Period --
Rise/eclipse dur. --
Remarks
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1 Schaefer, Brad The 3.80 hour period (and the final 3.8755 hour period published in 2020JAVSO..48...13S) cannot be correct because (1) the periodicity produces a DFT peak in the original data that is lower than many other DFT peaks, so the period claim was insignificant, (2) the periodicity does not appear in the simultaneous TESS light curve with amplitude limits of 0.00066 mag. (2021RNAAS...5..150S), and (3) novae before the transition phase, including around the peak, cannot display any coherent periodicity because the opaque shell hides the inner binary.
2 Schmeer, Patrick The only recorded eruption began probably only very few days before the first detection on 2019 Sept. 14 (mag. 19.2 R, ZTF data). After the first eruption peak on 2019 Nov. 29 a second maximum of the same brightness was reached on 2020 Jan. 17 (AAVSO data). Prior to this eruption, no brightenings had been recorded by the ASAS-SN Sky Patrol since 2015 Mar. 24.
3 Otero, Sebastian Alberto Very slow rise to maximum light.
4 Schmeer, Patrick Highly reddened galactic classical Fe II nova (2019ATel13130....1D and 2019ATel13283....1M).
5 Schmeer, Patrick Pan-STARRS1 i mag = 21.6.
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References
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1 Schmidt, R. E., 2020, The Photometric Period of Nova V2891 Cygni 2020JAVSO..48...13S
2 CBAT "Transient Object Followup Reports", 2020 (online data) --
3 E. V. Kazarovets; N. N. Samus; O. V. Durlevich; et al., 2019, The 82nd
Name-List of Variable Stars. Part II – RA 18h to 20h and Novae		 2019PZ.....39....3K
4 U. Munari, 2019, ATel #13283 2019ATel13283....1M
5 C.-H. Lee; M. Soraisam; G. Narayan; et al., 2019, ATel #13149 2019ATel13149....1L
6 K. De; M. Hankins; M. M. Kasliwal; et al., 2019, ATel #13130 2019ATel13130....1D
7 Gaia Alerts, 2019 (online data) --
8 R. Schmidt, 2019, AAVSO forum --
9 Transient Name Server, 2019 (online data) --
10 D. W. E. Green, 2019, Electronic Telegram No. 4694 --
11 Kochanek, C. S.; et al., 2017, The All-Sky Automated Survey for Supernovae
(ASAS-SN) Light Curve Server v1.0		 2017PASP..129j4502K
12 Zwicky Transient Factory (ZTF) (Antares online data) --
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Revision History
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15 Schaefer, Brad 2021-07-14 02:20 UTC Dubious period deleted.
14 Otero, Sebastian Alberto 2020-08-03 21:41 UTC Type from AAVSO data.
13 Schmeer, Patrick 2020-02-04 13:28 UTC Remark and reference added.
12 Otero, Sebastian Alberto 2019-12-06 01:56 UTC Outburst epoch and maximum magnitude from AAVSO data.
11 Otero, Sebastian Alberto 2019-11-28 22:04 UTC Epoch of maximum from AAVSO data.
10 Otero, Sebastian Alberto 2019-11-16 00:27 UTC Maximum magnitude and outburst epoch derived from AAVSO data.
9 Schmeer, Patrick 2019-11-11 22:07 UTC Remark and reference added.
8 Otero, Sebastian Alberto 2019-11-05 05:51 UTC Maximum magnitude and epoch from AAVSO data.
7 Schmeer, Patrick 2019-11-04 18:06 UTC Gaia Alerts name and reference added.
6 Schmeer, Patrick 2019-10-31 23:36 UTC Primary name from 2019PZ.....39....3K.
5 Otero, Sebastian Alberto 2019-10-30 07:22 UTC Epoch and maximum magnitude from ZTF data. Possible orbital period from R. Schmidt (2019).
4 Otero, Sebastian Alberto 2019-10-02 02:28 UTC Maximum magnitude and outburst peak epoch from ZTF data.
3 Schmeer, Patrick 2019-10-01 11:19 UTC ZTF designation and reference added.
2 Otero, Sebastian Alberto 2019-09-25 22:21 UTC Type and maximum magnitude form 2019ATel13130....1D.
1 Schmeer, Patrick 2019-09-25 22:19 UTC Pan-STARRS1 position. Maximum magnitude from TNS. Minimum magnitude from UKIDSS-DR6 Galactic Plane Survey (UGPS).

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