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Name
  DI Her  
AAVSO UID
000-BDB-944 (358 observations)  
Constellation
Hercules Sequence
J2000.0
18 53 26.24 +24 16 40.8  (283.35933 +24.27800) Search nearby
B1950.0 18 51 21.83 +24 12 53.8
Proper motion
RA: -1.306 +/- 0.034 mas/yDec: -4.016 +/- 0.049 mas/ySource: Gaia DR1
Galactic coord. 55.001 +10.393
Other names

(Internal only)
AAVSO 1849+24 AN 307.1930 BD+24 3568
HD 175227 HIP 92708 SAO 86544
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Variability type
EA/DM
Spectral type B5V+B4V
Mag. range
8.39 - 9.11 V
Discoverer --
Epoch
04 Jul 1974 (HJD 2442233.3476) Ephemeris
Outburst --
Period 10.550168 d
Rise/eclipse dur. 4%
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 GCVS Team Min II 8.95, DII = 0.03P, Min II - Min I = 0.77P (1966 - 1978). Apsidal motion: P = 29000yr +- 4000yr; Min II = 2442241.4602 + 10.5501751d*E. A considerable discrepancy between the observed and the theoretical rate of apsidal motion.
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References
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1 D.Ya.Martynov, Kh.F.Khaliullin, ApSS 71, 147-170, 1980. 1980Ap&SS..71..147M
2 Bob Nelson's O-C files, 2016 --
3 CALEB - Catalog and AtLas of Eclipsing Binaries --
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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 = 8.39H = 8.40K = 8.45J - K = -0.06
AllWISE W1 = 8.47W2 = 8.50W3 = 8.55W4 = 8.75W1 - W2 = -0.03W3 - W4 = -0.20
Images
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Supporting Documents
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Revision History
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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.