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Name
  AM Cyg  
AAVSO UID
000-BCM-575 (3312 observations)  
Constellation
Cygnus Sequence
J2000.0
20 49 00.85 +31 50 55.8  (312.25354 +31.84883) Search nearby
B1950.0 20 46 57.85 +31 39 45.4
Proper motion
RA: 3.58 +/- 2.99 mas/yDec: -4.22 +/- 3.76 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 74.647 -7.495
Other names

(Internal only)
2MASS J20490085+3150558 AAVSO 2044+31 AN 17.1906
ASASSN-V J204900.95+315056.2 ATO J312.2536+31.8488 GCRV 71492
Gaia DR2 1859874775104261120 Gaia DR3 1859874775104261120 HIP 102732
IRAS 20469+3139 IRC +30455 LAMOST J204900.88+315058.5
RAFGL 2660 TIC 230747875 TYC 2687-976-1
ZTF J204900.84+315055.7 ZTF18ablvwmz ZTF18adlyjjv
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Variability type
M
Spectral type M6-M9e
Mag. range
10.5 - 15.3 V
Discoverer Henrietta Leavitt (1906)
Epoch
26 Feb 2023 (HJD 2460002.0) Ephemeris
Outburst --
Period 370.3 d
Rise/eclipse dur. --
Remarks
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References
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1 Lu, H.; et al., 2019, Magnetic Activities of M-type Stars Based on LAMOST
DR5 and Kepler and K2 Missions
2019ApJS..243...28L
2 B.V.Kukarkin, P.P.Parenago, GCVS 1948. --
3 C.Hoffmeister, Sonn Mitt N10, 1927. 1927MiSon..10....1H
4 Dunér, N. C.; Hartwig, E.; Muller, G., 1911, Benennung von neu entdeckten
veränderlichen Sternen
1911AN....190...57.
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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 = 4.00H = 2.88K = 2.13J - K = 1.87
AllWISE W3 = 0.17W4 = -0.38W3 - W4 = 0.54
APASS-DR9 B = 12.98V = 12.23g' = 12.27r' = 11.20i' = 7.92B - V = 0.75
Images
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Supporting Documents
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Campaigns/Programs
 LPV Humps
Revision History
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4 Otero, Sebastian Alberto 2024-12-04 16:42 UTC Period, epoch and range from AAVSO data. Gaia DR3 position. Spectral type (M9) from 2019ApJS..243...28L.
3 Fernig, Leo 2022-11-15 22:33 UTC Discoverer updated from 1911AN....190...57. page 70.
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.