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Name
  MZ Cyg  
AAVSO UID
000-BDN-379 (1978 observations)  
Constellation
Cygnus Sequence
J2000.0
21 21 54.72 +37 27 33.1  (320.47800 +37.45919) Search nearby
B1950.0 21 19 53.63 +37 14 43.1
Proper motion
RA: -2.805 +/- 0.198 mas/yDec: -5.285 +/- 0.247 mas/ySource: Gaia DR1
Galactic coord. 83.413 -8.853
Other names

(Internal only)
1SWASP J212154.71+372732.9 2MASS J21215472+3727330 AN 89.1931
ASASSN-V J212154.69+372733.3 GSC 02715-02269 HIP 105485
IOMC 2715000079 NSVS 5902226 NSVS 8683225
NSVS 8704961 TYC 2715-2269-1  
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Variability type
RVA
Spectral type F5-G5e:
Mag. range
10.95 - 12.7 V
Discoverer --
Epoch
11 Jun 1992 (HJD 2448785.00) Ephemeris
Outburst --
Period 42.82 d
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Period changes. From 1989 to 2004 the period remained stable at 42.82 d. then there was a period increase. APASS data from 2012 and SuperWASP data from 2006-2007 indicate a period of 42.9 d.
2 GCVS Team P var. Max = 2427641.914 + 21.162460d*E + 0.10575d*10**(-3)*E**2 (JD2414900 - 37900) [V.M.Grigorevskij, Perem. Zvezdy 15, N3, 321, 1964.]; since JD2443600 - see Table. Probably it is an RV Tau type variable, and then the period should be doubled [G.E.Erleksova, IBVS N1663, 1979.]. [A/H] = 0.1.
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References
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1 Henden, A. A.; et al., 2012, Data Release 3 of the AAVSO All-Sky
Photometric Survey (APASS)		 2012JAVSO..40..430H
2 J. Alfonso-Garzon, A. Domingo, J.M. Mas-Hesse, A. Gimenez, 2012,
arXiv:1210.0821 [astro-ph.IM] (online info)		 2012arXiv1210.0821A
3 Catalogue of Stellar Spectral Classifications (Skiff, 2010) 2010yCat....102023S
4 T.S.Meshkova, Perem. Zvezdy 5, 271, 1940. --
5 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.		 --
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 = 9.77H = 9.40K = 9.22J - K = 0.56
AllWISE W1 = 9.11W2 = 9.05W3 = 9.08W4 = 8.89W1 - W2 = 0.06W3 - W4 = 0.19
APASS-DR9 B = 12.07V = 11.29g' = 11.44r' = 10.99i' = 10.74B - V = 0.78
Images
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 21 21 54.72 +37 27 33.1 (J2000)
Source STScI
Survey

Red, all sky, 1.0 arcsec/pixel
  Negative
Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2015-10-02 02:09 UTC Phase plot with NSVS, HIPPARCOS, Berdnikov, SuperWASP, APASS and INTEGRAL-OMC data.
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Revision History
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4 Otero, Sebastian Alberto 2015-10-02 02:09 UTC Period, epoch and range from NSVS, HIPPARCOS, Berdnikov, SuperWASP, APASS and INTEGRAL-OMC data. HIPPARCOS position.
3 Otero, Sebastian Alberto 2011-08-28 03:04 UTC Type from IBVS 1663. Spectral type from Skiff (2010).
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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