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Latest Details
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Name
  BI Cyg  
AAVSO UID
000-BCL-401 (6152 observations)  
Constellation
Cygnus Sequence
J2000.0
20 21 21.89 +36 55 55.7  (305.34121 +36.93214) Search nearby
B1950.0 20 19 29.14 +36 46 19.5
Proper motion
RA: -0.4 +/- 1.3 mas/yDec: -4.1 +/- 2.9 mas/ySource: UCAC4
Galactic coord. 75.320 +0.112
Other names

(Internal only)
2MASS J20212192+3655555 AAVSO 2017+36B AN 23.1919
ASASSN-V J202121.89+365556.7 BD+36 4025 GSC 02684-00522
IOMC 2684000059 IRAS 20194+3646 IRC +40408
RAFGL 2559 TIC 13249363 TYC 2684-522-1
WDS J20214+3656A    
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Variability type
SRC
Spectral type M4Iab
Mag. range
8.86 - 10.00 V
Discoverer Thomas Espin (1920)
Epoch
--
Outburst --
Period 800 d
Rise/eclipse dur. --
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 2020JAVSO..48...50P Other period 319 d.
2 GCVS Team VB A (B 9.4m, 126", 110deg).
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References
Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Percy, J. R., 2020, Period Analysis of All-Sky Automated Survey for
Supernovae (ASAS-SN) Data on a Sample of “Irregular” Pulsating Red Giants
2020JAVSO..48...50P
2 Kochanek, C. S.; et al., 2017, The All-Sky Automated Survey for Supernovae
(ASAS-SN) Light Curve Server v1.0
2017PASP..129j4502K
3 J. Alfonso-Garzon, A. Domingo, J.M. Mas-Hesse, A. Gimenez, 2012,
arXiv:1210.0821 [astro-ph.IM] (online info)
2012arXiv1210.0821A
4 J.G.Hagen, J.Stein, ASV VIII. 1989eerz.book.....H
5 M.Beyer, Erg AN 12, N2, 1950. --
6 Hartwig, E.; Muller, G., 1921, Benennung von neu entdeckten veraenderlichen
Sternen
1921AN....212..353.
External Links
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Location    Go   
Select a Location for more details.
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 = 2.35H = 1.14K = 0.72J - K = 1.62
AllWISE W3 = -1.73W4 = -3.28W3 - W4 = 1.55
APASS-DR9 B = 12.58V = 9.40g' = 10.95r' = 8.09i' = 5.92B - V = 3.19
Images
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 20 21 21.89 +36 55 55.7 (J2000)
Source STScI
Survey

Red, all sky, 1.0 arcsec/pixel
  Negative
Supporting Documents
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Campaigns/Programs
 SNEWS Campaign
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
5 Fernig, Leo 2023-03-29 20:25 UTC Discoverer updated from 1921AN....212..353. page 372.
4 Rodriguez, David R.V. 2023-03-22 20:24 UTC Type and period from 2020JAVSO..48...50P.
3 Otero, Sebastian Alberto 2021-02-26 00:46 UTC Range from ASAS-SN data. Gaia EDR3 position.
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.