This answer to First satellite of an asteroid (or double asteroid) ever imaged by delay-Doppler radar? mentions that Wikipedia's 1866 Sisyphus; Binary system says:
In 1985, this object was detected with radar from the Arecibo Observatory at a distance of 0.25 AU. The measured radar cross-section was 8 square kilometers.[6][a] During the radar observations, a small minor-planet moon was detected around Sisyphus, although its existence was not reported until December 2007. Robert Stephens confirmed that it is a suspected binary,[7] and Brian Warner added additional weight to this conclusion, giving 27.16±0.05 hours as the satellite's orbital period, longer than the 25 hours previously reported by Stephens.[8]
6Ostro, S. J.; Campbell, D. B.; Chandler, J. F.; Shapiro, I. I.; Hine, A. A.; Velez, R.; et al. (October 1991). "Asteroid radar astrometry". Astronomical Journal. 102: 1490–1502. doi:10.1086/115975.
aBenner (1985), gives a diameter of 8 kilometer. Summary figures listed at LCDB
7Stephens, Robert D.; French, Linda, M.; Warner, Brian D.; Wasserman, Lawrence H. (October 2011). "The Curse of Sisyphus". The Minor Planet Bulletin. 38 (4): 212–213. Retrieved 12 December 2016.
8Warner, Brian D. (October 2016). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 April-July". The Minor Planet Bulletin. 43 (4): 311–319.
Reference 7, "The Curse of Sisyphus" is the only reference I am currently unable to read. Unfortunately Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, Vol. 38, No. 4, p. 212-213 (2011) doesn't seem to be available online when I click "pdf".
With a title like that I wonder if it might contain some information on how the the small minor moon was "detected" in 1985 but, apparently, not reported.
Question: What exactly was "The curse of Sisyphus" and why did it take so long to find out about the radar detection of its companion?
note: I'm not asking about Greek mythology. I'm hoping the choice of the title for the Minor Planet bulletin describes more recent events.