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Name
  DDE 74  
AAVSO UID
000-BMF-928 (No observations)  
Constellation
Equuleus Sequence
J2000.0
21 15 31.48 +12 39 57.7  (318.88117 +12.66603) Search nearby
B1950.0 21 13 07.61 +12 27 26.6
Proper motion
RA: -2.1 +/- 4.6 mas/yDec: -10.7 +/- 4.8 mas/ySource: UCAC4
Galactic coord. 62.996 -24.247
Other names

(Internal only)
ASASSN-V J211531.48+123957.5 ATO J318.8811+12.6659 CSS_J211531.4+123957
GALEX J211531.4+123957 LAMOST J211531.48+123957.6 SDSS J211531.48+123957.5
UCAC4 514-133487 URAT1 514-604053 USNO-A2.0 0975-20178891
USNO-B1.0 1026-0723828 WISE J211531.47+123958.2  
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Variability type
EA/HW
Spectral type sdB
Mag. range
16.0 - 16.9 CV
Discoverer Denis Denisenko
Epoch
16 Nov 2010 (HJD 2455517.421) Ephemeris
Outburst --
Period 0.347768 d  (8.3464 h)
Rise/eclipse dur. 5%  (0.42 h)
Remarks
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1 Denisenko, Denis SDSS position. Period from CRTS data. GALEX FUV-NUV=-0.19, g-r=-0.41, r-i=-0.31. Spectral type from Gentile Fusillo et al., 2015MNRAS.448.2260G.
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References
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1 Geier, S., 2020, The population of hot subdwarf stars studied with Gaia.
III. Catalogue of known hot subdwarf stars: Data Release 2		 2020A&A...635A.193G
2 T. Kato, 2018, vsnet-chat #8237 --
3 Drake, A. J.; et al., 2009, Catalina Real-time Transiet Survey 2009ApJ...696..870D
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.
AllWISE W1 = 16.71
APASS-DR9 B = 16.05V = 16.12g' = 15.89r' = 16.18B - V = -0.08
GALEX-DR5 FUV = 15.08NUV = 15.27FUV - NUV = -0.18
SDSS-DR12 u = 15.65g = 15.74r = 16.15i = 16.46z = 16.72u - g = -0.09r - i = -0.31
Images
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Supporting Documents
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2 DDE 74 phased light curve Denisenko, Denis 2017-03-16 12:25 UTC Light curve from Catalina Sky Survey data folded with the best orbital period
1 DDE 74 finder chart Denisenko, Denis 2017-03-15 22:14 UTC Color-combined (BRIR) DSS finder chart with 10'x10' FOV
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Revision History
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2 Otero, Sebastian Alberto 2020-10-27 19:15 UTC Type and spectral type from 2020A&A...635A.193G. Gaia DR2 position.
1 Denisenko, Denis 2017-03-16 18:10 UTC Initial submission.

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