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Name
  V1804 Cyg  
AAVSO UID
000-BCN-278 (1645 observations)  
Constellation
Cygnus Sequence
J2000.0
21 07 29.79 +37 10 44.7  (316.87413 +37.17908) Search nearby
B1950.0 21 05 30.76 +36 58 35.5
Proper motion
RA: -3.9 +/- 6.5 mas/yDec: 13.7 +/- 6.9 mas/ySource: UCAC4
Galactic coord. 81.225 -6.957
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 2103+36B ASASSN-V J210729.78+371044.8 LD 39
NSV 13553 SON 9106  
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Variability type
M
Spectral type M7
Mag. range
11.4 - 16.5 V
Discoverer --
Epoch
--
Outburst --
Period 411: d
Rise/eclipse dur. --
Remarks
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1 Huziak, Richard Type is incorrect in VSX & GCVS. V1804 Cyg is a Mira with range 11.4V - 16.5V, period ~411d. See AAVSO light curve for the last 2500 days. The star experiences an interesting stall on the rising branch. The location of V1804 was misidentified on AAVSO charts before 2001. ID & photometry by HUZ & PVA. Additional observations by LAI.
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References
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1 L.Dahlmark, IBVS N2157,1982. 1982IBVS.2157....1D
2 C.Hoffmeister, AN 289,1,1966. 1966AN....289....1H
External Links
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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 = 5.12H = 4.11K = 3.53J - K = 1.59
AllWISE W1 = 3.46W2 = 2.94W3 = 2.16W4 = 1.62W1 - W2 = 0.53W3 - W4 = 0.54
APASS-DR9 B = 14.58V = 13.04g' = 13.93r' = 11.73B - V = 1.54
Images
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Supporting Documents
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Revision History
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3 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
2 Huziak, Richard 2008-11-17 00:58 UTC Period, amplitude and type from AAVSO CCD data. Spec from SIMBAD
1 Admin, VSX 2005-12-18 01:33 UTC Initial database population.

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