Comment Re: Occultations? (Score 3, Informative) 69
While that's true,
1) We're not talking about an asteroid-sized object
2) We're not talking about one object occulting things
3) We're not talking about one object being occulted.
While you're right, that through pure chance, the likelihood of taking a shot of one particular asteroid occulting one particular star if you take a shot once every 3 nights is near zero. However... one shot from vera rubin captures on average 10,000,000 stars, and around 1000 potential occulters. It's estimated that an occultation will occur in roughly 1 in 10 to 1 in 100 exposures from vera rubin.