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Name
  DDE 35  
AAVSO UID
000-BLQ-971 (986 observations)  
Constellation
Ursa Major Sequence
J2000.0
10 54 59.31 +68 11 53.2  (163.74713 +68.19811) Search nearby
B1950.0 10 51 37.33 +68 27 53.3
Galactic coord. 137.847 +45.410
Other names

(Internal only)
1RXS J105503.5+681208 2MASS J10545932+6811532 GALEX J105459.2+681153
GSC 04385-01577 GSC2.3 N7SL000176 Gaia16aoy
UCAC4 791-022450 USNO-A2.0 1575-03116396 USNO-B1.0 1581-0156449
ZTF18accnpno    
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Variability type
UGZ+VY
Spectral type --
Mag. range
14.7 - 19.9 r
Discoverer Denis Vladimirovich Denisenko
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto VSP Note: 20.7 mag. star 5" to the S and 13.3 mag. star 11" to the ESE.
2 Otero, Sebastian Alberto Classified as an UGSU based on superhump detection (vsnet-alert 24074). These humps, however, were seen only on two nights (2020 Mar. 16 and 18) and no humps were apparent on Mar. 19. The ZTF data show distinct high and low states unlike an UGSU star. The magnitude (around 16) in 2020 Mar. was too faint (MV=+6.6) for a superoutburst (vsnet-alert 27165). Too blue for a polar (vsnet-alert 27178). Could rather be an active NL/VY star, like KR Aur, dominated by low states (vsnet-alert 27191).
3 Schmeer, Patrick SU UMa-type dwarf nova above the period gap, superhump period 0.116 d. (vsnet-outburst 24821). The spectrum has a flat continuum with obvious H and He I emission lines. The lack of He II emission lines suggests that the star is not strongly magnetic (2017AN....338..794W). Gaia DR2 parallax 1.2959 ± 0.0585 mas (distance 755 ± 35 pc).
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References
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1 T. Kato, 2023, vsnet-alert #27336 --
2 T. Kato, 2022, vsnet-alert #27165 --
3 T. Kato, 2022, vsnet-alert #27191 --
4 E. Pavlenko; T. Kato, 2022, vsnet-alert #27178 --
5 T. Kato, 2020, vsnet-outburst #24821 --
6 N. Pit; T. Kato, 2020, vsnet-alert #24074 --
7 Masci, F. J.; et al., 2019, The Zwicky Transient Facility: Data Processing,
Products, and Archive		 2019PASP..131a8003M
8 Wörpel, H.; Schwope, A. D., 2017, Identification spectra of several
Northern Hemisphere cataclysmic variable candidates		 2017AN....338..794W
9 M. Fraser; et al., 2016, ATel #9062 2016ATel.9062....1F
10 Gaia alerts, 2016 (online data) --
11 D. Denisenko, 2015, vsnet-alert #18771 --
12 New Variable Stars by D.Denisenko --
External Links
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Location    Go   
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS H = 14.91K = 14.98
GALEX-DR5 FUV = 16.45NUV = 16.11FUV - NUV = 0.34
Images
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Supporting Documents
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2 DDE 35 finder chart Denisenko, Denis 2015-06-21 13:23 UTC Color-combined (BRI) DSS finder chart with 10'x10' FOV
1 DDE 35 outburst in NSVS data Denisenko, Denis 2015-06-21 13:23 UTC Outburst of NSVS 867733 (blend of DDE 35 and nearby 13m star) around 1999 May 9
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Revision History
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5 Otero, Sebastian Alberto 2023-01-20 14:50 UTC Type from vsnet-alert 27336.
4 Otero, Sebastian Alberto 2022-12-28 19:30 UTC Type from vsnet-alert 27165, 27178 and 27191. Range from ZTF data.
3 Schmeer, Patrick 2018-07-15 00:06 UTC Gaia DR2 position. Range from Gaia Alerts data. Type from vsnet-outburst 24821.
2 Otero, Sebastian Alberto 2016-05-17 23:54 UTC Gaia reference and position.
1 Denisenko, Denis 2015-06-23 02:00 UTC Initial submission.

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