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I found another disappearing dot, again on a scanned archival Red plate (absent from two other archival Red scanned plates, also one archival Blue and one archival Optical Infrared). Its Red magnitude is +17.8 by comparison with a nearby star with stable catalog magnitudes. Its coordinates are
RA 11 03 12.4 Decl -5 58 09
This is a POSS I Palomar plate from 1954.154. The position is quite consistent with the track, the period and the 1987 archival object (est. Red mag +17.3) discussed above.
Tonight's coordinates, based on great-circle extrapolation & corrected for Earth parallax are
RA 11 25 49.4 Decl -9 03 02.
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