NN Del

[Patrick Wils <patrickwils@yahoo.com>]

NN Del is classified as an eclipsing binary because it was observed 0.5
mag fainter than usual around JD 2448062.4 by Hipparcos (out of 21
"nights").  I don't know of another minimum of this star.  
Tom observed it about 0.25 mag fainter than on 14 other nights around
JD 2452529.6 (mag 8.65 instead of 8.4 in V, 8.05 instead of 7.8 in Ic).
 Two nights before and four nights after, it was at a normal level.

Based on the fact that the star is observed in minimum on average on
one out of 18 occasions, and the minimum lasts less than 6 days, one
might assume that the period is less than 108 days.  It might be
interesting to look for further minima of this star (coordinates:
311.7051 +7.5529).

Patrick


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