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Name
  AB Dra  
AAVSO UID
000-BCJ-106 (55525 observations)  
Constellation
Draco Sequence
J2000.0
19 49 06.53 +77 44 23.3  (297.27721 +77.73981) Search nearby
B1950.0 19 51 04.15 +77 36 40.6
Proper motion
RA: -8.2 +/- 1.4 mas/yDec: -9.9 +/- 3.0 mas/ySource: UCAC4
Galactic coord. 109.974 +23.486
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J194907.8+774415 1WGA J1949.1+7744 2E 1951.0+7736
2E 4296 2MASS J19490658+7744232 2RXS J194906.7+774421
2XMM J194906.4+774423 3XMM J194906.5+774423 AAVSO 1953+77
AN 90.1934 ASASSN-V J194906.49+774422.8 AllWISE J194906.52+774423.2
Downes AB Dra GALEX J194906.6+774423 GALEX J194906.7+774423
GALEX J194906.8+774423 GSC 04588-01570 GSC2.3 N0YS000401
LPM +77.0445 NSVS 1256106 PPMX J194906.5+774423
SBC9 1189 SDSS J194906.51+774423.2 TASS4 3612140
UCAC4 839-016781 WEB 17146 WISE J194906.51+774423.1
XMMOM J194906.5+774424    
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Variability type
UGZ
Spectral type pec(UG)
Mag. range
12.3 - 16.2 V
Discoverer Otto Morgenroth
Epoch
--
Outburst --
Period 0.1520 d  (3.65 h)
Rise/eclipse dur. --
Remarks
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1 Schmeer, Patrick Gaia DR2 parallax 2.4421 ± 0.0265 mas (distance 404.7 ± 4.4 pc).
2 Linnolt, Mike Since late 2014, this star has had a dramatic change in behavior. It has shown characteristics of standstill from Dec 2014 - Feb 2015, a few typical UG-like outbursts, then more irregular behavior since end of Apr 2015, with rapid and peculiar variations in brightness of reduced intermediate amplitudes. It may be a UGZ subtype, or some other type, but further data is needed to clarify.
3 Otero, Sebastian Alberto Never any standstill in decades of coverage.
4 Otero, Sebastian Alberto GCVS outburst cycle is 13.4 d.
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References
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1 T. Kato, 2018, vsnet-chat #8113 --
2 Kochanek, C. S.; et al., 2017, The All-Sky Automated Survey for Supernovae
(ASAS-SN) Light Curve Server v1.0
2017PASP..129j4502K
3 T. Kato, 2017, vsnet-alert #21266 --
4 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
5 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
6 M.Petit, JO 44, 6-10, 1961. 1961JO.....44....6P
7 Morgenroth, O., 1934, 77 neue Veränderliche 1934AN....252..389M
8 Simonsen, M. et al., The Z Cam List --
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 J = 13.62H = 13.29K = 13.11J - K = 0.52
AllWISE W1 = 12.39W2 = 12.27W3 = 12.94W1 - W2 = 0.12
APASS-DR9 B = 15.21V = 14.87g' = 15.07r' = 14.63i' = 14.18B - V = 0.34
GALEX-DR5 FUV = 15.29NUV = 15.02FUV - NUV = 0.28
SDSS-DR12 u = 15.62g = 15.53r = 15.28i = 15.08z = 14.90u - g = 0.09r - i = 0.19
Images
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Supporting Documents
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Campaigns/Programs
 Z CamPaign
 Legacy CVs
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
6 Schmeer, Patrick 2019-02-20 08:31 UTC Type from vsnet-alert 21266 and vsnet-chat 8113. Minimum magnitude from ASAS-SN and AAVSO data data. Gaia DR2 position. Discoverer added from 1934AN....252..389M.
5 Linnolt, Mike 2015-05-15 09:18 UTC Type changed from UGSS to UG due to major change in behavior since late 2014.
4 Otero, Sebastian Alberto 2012-04-09 19:16 UTC Type from AAVSO data.
3 Otero, Sebastian Alberto 2011-03-28 15:03 UTC Primary record creation. Orbital period and range from Downes (2001). UCAC3 position.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.