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Name
  V0426 Sge  
AAVSO UID
000-BMS-818 (5075 observations)  
Constellation
Sagitta Sequence
J2000.0
19 54 42.96 +17 22 12.8  (298.67900 +17.37022) Search nearby
B1950.0 19 52 27.55 +17 14 16.1
Galactic coord. 55.644 -5.476
Other names

(Internal only)
2MASS J19544295+1722125 ASAS J195442+1722.2 ASASSN-V J195442.95+172212.6
CMC15 J195442.9+172212 GSC 01620-01205 HBHa 1704-05
IRAS Z19524+1714 NSVS 11279815 PPMX J195442.9+172212
TASS4 4147652 TCP J19544251+1722281 UCAC2 37963287
UCAC4 537-112537 Vend47 WISE J195442.95+172212.7
WISEA J195442.95+172212.7 ZTF18aawbqwm [KW97] 40-56
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Variability type
ZAND+NC:
Spectral type M4-5III+WD
Mag. range
10.7 - 13.2 V
Discoverer ASAS-SN
Epoch
13 Oct 1970 (HJD 2440873.0) Ephemeris
Outburst 1968
Period 493.4 d
Rise/eclipse dur. --
Remarks
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1 Schmeer, Patrick The historical light curve reveals no symbiotic-like activity from ~1900 to 1967. In 1968, V426 Sge experienced a symbiotic nova eruption that ceased around 1990. From approximately 1972, a wave-like orbitally related variation with a period of 493.4 ± 0.7 days developed in the light curve. This was interrupted by a Z And-type outburst from the beginning of August 2018 to the middle of February 2019 (2020A&A...636A..77S). No spectroscopy is available for the very slow nova phase; "probable symbiotic nova" according to U. Munari (personal communication). Gaia EDR3 parallax 0.189 ± 0.028 mas (distance ~5 kpc).
2 Schmeer, Patrick Gaia DR2 parallax 0.2753 ± 0.0578 mas (distance 3 kpc).
3 Schmeer, Patrick First noted by Kohoutek and Wehmeyer in their catalog of emission line stars (1999A&AS..134..255K) as a source with a strong continuum (thus not a PN) and overexposed Halpha emission (from ATel #11937).
4 Otero, Sebastian Alberto Sudden brightening on HJD 2458336 (August 5, 2018). It rose from V= 12.5 to 10.7 in only 4 days.
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References
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1 Munari, U., 2021, personal communication --
2 Skopal, A.; Shugarov, S. Yu.; Munari, U.; et al., 2020, The path to Z
And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)		 2020A&A...636A..77S
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; S. Dallaporta; P. Valisa; et al., 2018, ATel #11937 2018ATel11937....1M
5 Jayasinghe, T.; Kochanek, C. S.; Stanek, K. Z.; et al., 2018, The ASAS-SN
Catalog of Variable Stars I: The Serendipitous Survey		 2018arXiv180301001J
6 CBAT "Transient Object Followup Reports", 2018 --
7 Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; et al., 2017, General
Catalogue of Variable Stars: Version GCVS 5.1 (November 2019)		 2017ARep...61...80S
8 Kohoutek, L.; Wehmeyer, R., 1999, Catalogue of H-alpha emission stars in
the Northern Milky Way		 1999A&AS..134..255K
9 MacConnell, D. J., 1982, Discoveries on southern, red-sensitive
objective-prism plates. IV Extension to higher latitudes		 1982A&AS...48..355M
10 ZTF observations (Lasair online data) --
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Revision History
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7 Schmeer, Patrick 2021-02-19 11:42 UTC Type (NC:) from U. Munari (pers. comm.). Eruption year, spectral type, orbital period and epoch from 2020A&A...636A..77S. ZTF transient designation and reference added.
6 Otero, Sebastian Alberto 2020-05-24 17:50 UTC Epoch from the GCVS (November 2019 version).
5 Admin, VSX 2019-11-01 02:51 UTC Update from [2019PZ.....39....3K].
4 Schmeer, Patrick 2019-03-22 14:02 UTC Gaia DR2 position.
3 Schmeer, Patrick 2018-08-11 15:53 UTC Type and spectral type from 1999A&AS..134..255K.
2 Otero, Sebastian Alberto 2018-08-10 06:13 UTC Type and range from ASAS-SN data and the CBAT "Transient Object Followup Reports" page. Gaia DR2 position. Spectral type from 1982A&AS...48..355M.
1 Admin, VSX 2018-01-30 00:30 UTC Preserved original object data.

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