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Name
  DDE 175  
AAVSO UID
000-BNF-911 (283 observations)  
Constellation
Aquila Sequence
J2000.0
19 03 56.18 +09 01 58.4  (285.98408 +9.03289) Search nearby
B1950.0 19 01 32.64 +08 57 27.4
Galactic coord. 42.390 +1.357
Other names

(Internal only)
2MASS J19035618+0901583 IPHAS J190356.19+090158.4 PGIR 20djo
URAT1 496-396386 USNO-A2.0 0975-14005660 ZTF18aaywchl
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Variability type
ZAND
Spectral type em
Mag. range
15.5 - 20.8 r
Discoverer Denis Denisenko, B. Sesar et al.
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Denisenko, Denis Unusual object with changing behavior. Chaotic large-amplitude variability (18.2-<20 r) in ZTF data during MJD= 58200-58300 followed by a nearly stable state at 18.0-18.2 r, 20.5-20.7 g during MJD= 58300-58440. Past brightenings to R= 17.5 on the 1951-07-04 POSS-I red plate and to r= 16.33 in IPHAS data (Witham et al., 2008). J-K= 1.07 (2MASS), r-i= 1.81 (IPHAS; high state), r-i= 2.27 (PanSTARRS-1; low state).
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References
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1 K. De; D. Stern; L. Hillenbrand; et al., 2021, ATel #14475 2021ATel14475....1D
2 D. Denisenko; D. Fernandez Ortiz; A. Kolesnikov; et al., 2021, ATel #14376 2021ATel14376....1D
3 Masci, F. J.; et al., 2019, The Zwicky Transient Facility: Data Processing,
Products, and Archive		 2019PASP..131a8003M
4 Sesar, B.; et al., 2017, Machine-learned Identification of RR Lyrae Stars
from Sparse, Multi-band Data: The PS1 Sample		 2017AJ....153..204S
5 Witham, A. R.; et al., 2008, The IPHAS catalogue of H_alpha emission-line
sources in the northern Galactic plane		 2008MNRAS.384.1277W
6 ZTF observations (Lasair online data) --
External Links
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Images
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Supporting Documents
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3 Comparison of DSS plates showing DDE 175 variability Denisenko, Denis 2019-08-06 15:46 UTC Animation of POSS Red plates taken on 1951-07-04 (high state) and 1987-05-30 (low state)
2 DDE 175 finder chart Denisenko, Denis 2019-08-06 15:34 UTC Color-combined DSS finder chart with 10'x10' FOV
1 DDE 175 light curve Denisenko, Denis 2019-08-06 15:34 UTC Light curve from ZTF data
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Revision History
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4 Otero, Sebastian Alberto 2021-03-23 00:18 UTC Type from 2021ATel14475....1D.
3 Otero, Sebastian Alberto 2021-02-17 18:38 UTC Maximum magnitude from ZTF data.
2 Otero, Sebastian Alberto 2021-02-10 03:19 UTC Maximum magnitude from ZTF (Lasair) data.
1 Denisenko, Denis 2019-08-09 01:03 UTC Gaia DR2 position. Maximum magnitude from IPHAS, minimum magnitude from ZTF data. Spectral type from 2008MNRAS.384.1277W.

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