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Details for Revision 2
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Name
  V1489 Cyg  
AAVSO UID
000-BCV-732 (720 observations)  
Constellation
Cygnus Sequence
J2000.0
20 46 25.54 +40 06 59.4  (311.60642 +40.11650) Search nearby
B1950.0 20 44 33.93 +39 55 56.9
Galactic coord. 80.798 -1.921
Other names

(Internal only)
2MASS J20462554+4006594 AAVSO 2042+39 IRC +40448
NML Cyg OH 80.8 -1.9 RAFGL 2650
SDSS J204625.54+400659.5 TIC 66995250 [A70] 78-0-133
[LFO93] 2044+39 [PCC93] 428  
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Variability type
*
Spectral type M4.5-M7.9Ia-III
Mag. range
11.19 - 12.54 R
Discoverer --
Epoch
--
Outburst --
Period 1280 d  (3.50 y)
Rise/eclipse dur. --
Remarks
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1 GCVS Team NML Cyg. 17.0m: - 18.0m V, B>21M; I - K = +8.17. Very large IR exess due to expanding gaseous-dust envelope. In the area 2.5"*3.5" around the star the system of about 60 discrete sources of OH emission is detected [R.D.Davies, M.R.Masheder, R.S. Booth, Nature Phys SCI, 237, 21, 1972.]; source of OH, H2O, SiO maser emission. Light variations are periodical (see also [G.V.Khozov, T.N.Khydyakova, V.M. Larionov, L.V.Larionova, Tr. Astron. Obs. Leningrad 34, N397, 68, 1978.]). The object may be a protostar being observed at the end of condensation process. The late spectrum arises probably in the extending envelope [G.H.Herbig, ApJ 189, 75, 1974., J.J.Daniel, AsAp 111, 58, 1982.].
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References
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1 Zhang, B.; Reid, M. J.; Menten, K. M.; et al., 2012, The distance and size
of the red hypergiant NML Cygni from VLBA and VLA astrometry		 2012A&A...544A..42Z
2 D.W.Strecker, AJ 80, N6, 451, 1975. 1975AJ.....80..451S
3 G.Neugebauer, D.E.Mertz, R.B. Leighton, ApJ 142, 399, 1965. 1965ApJ...142..399N
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Supporting Documents
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Revision History
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3 Otero, Sebastian Alberto 2021-02-11 20:50 UTC Type from 2012A&A...544A..42Z. 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.

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