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Name
  S Del  
AAVSO UID
000-BCM-271 (22038 observations)  
Constellation
Delphinus Sequence
J2000.0
20 43 04.88 +17 05 17.4  (310.77033 +17.08817) Search nearby
B1950.0 20 40 46.68 +16 54 26.5
Proper motion
RA: 4.34 +/- 2.85 mas/yDec: 3.78 +/- 1.73 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 61.793 -15.321
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
2MASS J20430489+1705173 AAVSO 2038+16 ASAS J204305+1705.1
BD+16 4351 DO 19287 GSC 01638-00307
HD 197420 HIP 102246 IDS 20385+1643 A
IRAS 20407+1654 IRC +20477 SAO 106422
TYC 1638-307-1 WDS J20431+1705B  
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Variability type
M
Spectral type M5e-M8
Mag. range
8.3 - 12.4 V
Discoverer Joseph Baxendell (1860)
Epoch
09 Oct 1981 (HJD 2444887.00) Ephemeris
Outburst --
Period 277.75 d
Rise/eclipse dur. 52%  (144 d)
Remarks
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1 Schmeer, Patrick Gaia DR2 parallax 1.3134 0.1026 mas (distance 0.75 0.06 kpc). Optical Vmag. 8.5 companion 56" to the NNW.
2 GCVS Team VB A (B 56", 342deg). Double maxima are sometimes observed.
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References
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1 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
2 Baxendell, J., 1861, On the Three New Variable Stars, T Bootis, T
Serpentis, and S Delphini
1861MNRAS..21...68B
3 T. Karlsson, Maxima of Mira stars --
4 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.
--
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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 = 3.50H = 2.56K = 2.14J - K = 1.36
AllWISE W3 = 1.02W4 = 0.59W3 - W4 = 0.44
APASS-DR9 B = 12.61V = 11.00g' = 11.93r' = 10.03i' = 7.26B - V = 1.62
Images
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Supporting Documents
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Campaigns/Programs
 Legacy LPV Program
 LPV Program
Revision History
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3 Schmeer, Patrick 2018-07-07 07:06 UTC Gaia DR2 position. Discoverer added from 1861MNRAS..21...68B.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.