A Titan/IUS was launched on 9 April at 1701 UT from Florida. I have never seen a solid rocket burn but it is at the top of my wish list. Well, maybe second after seeing a re-entry of a rocket or payload that breaks up. I suspect that a solid rocket would eject particulate matter that, if sunlit, might behave as you described. I will take this chance to once again plead, beg, and whimper for advance notice of any solid rocket burn (geosynchronous is fine). Ron Lee Amateur astronomers and >general public as well observed from Sao Carlos, Brazil (22 deg 01' S, >47 deg 54' W, elevation 850 m) the apparition of a strange ball-like >white cloud on Friday April 9, 1999 at aproximatelly 23:30 UTC (20:30 >local). The small round cloud appeared at about 28 deg Alt, 290 deg Az >(in Orion, between the "Orion Belt" and Betelgeuse), grew larger and >turned into a smoky ring of a diameter of about 3-5 deg. It lasted about >5 min and appeared to remain fixed related to stars in the background. >Other people observed the same phenomenon from nearby cities (including >Bauru, 140 km SW) at roughly the same time and in the same part of the >sky. We have no explanation so far. Could it had been generated by a >Titan 4 rocket (or its payload) launched on that day?. Or by an Ariane >42 (or payload INSAT 2E) launched a few days earlier?. Were phenomena >like this one observed before?. > Aldo Loup.