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Name
  V1647 Sgr  
AAVSO UID
000-BFG-071 (1 observation)  
Constellation
Sagittarius Sequence
J2000.0
17 59 13.47 -36 56 19.8  (269.80613 -36.93884) Search nearby
B1950.0 17 55 49.46 -36 56 08.5
Proper motion
RA: 12.36 +/- 1.24 mas/yDec: -10.96 +/- 0.55 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 354.530 -6.509
Other names

(Internal only)
ASASSN-V J175913.34-365619.5 CD-36 12064 CPD-36 7843
HD 163708 HIP 88069 SAO 209552
TIC 469407765    
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Variability type
EA+HB
Spectral type A1V+A2V
Mag. range
6.94 - 7.57 V
Discoverer --
Epoch
27 May 1973 (HJD 2441829.6951) Ephemeris
Outburst --
Period 3.28279251 d
Rise/eclipse dur. 8%  (6.3030 h)
Remarks
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1 2021A&A...647A..12K Apsidal motion with P= 531 y. Triple system with a F0/1V companion 7" away. HB amplitude 0.010 TESS.
2 GCVS Team VB A (B 9.13m, 8", 104deg). Min II 7.43, DII = 0.059P, Min II - Min I = 0.262P (JD2441830); Min II = 2441830.55561 + 3.28282227d*E. The apsidal motion period is 592.5 +- 6.5 years.
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References
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1 Kolaczek-Szymanski, P. A.; et al., 2021, Massive heartbeat stars from TESS.
I. TESS sectors 1-16		 2021A&A...647A..12K
2 Bob Nelson's O-C files, 2016 --
3 J.Andersen, A.Gimenez, AsAp 145, N1, 206, 1985. 1985A&A...145..206A
4 CALEB - Catalog and AtLas of Eclipsing Binaries --
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 = 6.91H = 6.93K = 6.89J - K = 0.03
AllWISE W1 = 6.83W2 = 6.86W3 = 6.99W4 = 6.97W1 - W2 = -0.04W3 - W4 = 0.03
Images
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Supporting Documents
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Revision History
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3 Otero, Sebastian Alberto 2024-06-13 12:24 UTC Type from 2021A&A...647A..12K.
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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