Rainbows are clearly not ordinary objects, being more like mirages than oases. But they are just as clearly not fictional objects. One’s conception of a rainbow may well contain false presuppositions, but in that way rainbows do resemble ordinary objects. Consider a red apple. Perhaps what is really there is a 10-dimensional collection of particle-strings within a 4-dimensional block universe, with the red and the spheroid existing only in the minds of certain kinds of potential perceivers of that collection. (That modern scientific hypothesis is not a million miles away from theistic idealism, of course.) Anyway, suppose some fictional meteorologists defined ‘rainbow’ to be a specific sort of event. They might do so because such a technical convention suited their scientific needs better than the rather vague ordinary meaning. And of course, an event is a kind of object (especially in a 4-Dimensionalist world). Now, some relatively arbitrary choices may well have been made as they specified their referent of ‘rainbow’. But that does not mean that rainbows cannot be objects. They are, after all, intentional objects, over which we might quantify. And of course, our intuitions that rainbows are not objects all derive from the fact that they are not ordinary objects. I mention this because it strikes me as similar to Benacerraf’s famous argument about what numbers cannot be.
In 2003 I was published in the British Journal for the Philosophy of Science, but I've DONE little since then, although I am currently writing a book. Blogging since 2007, originally as enigMan (a "Meaning"-full name), my main involvement was via the Philosophers' Carnival because I started a PhD in Philosophy in 2007. The preliminary work for my book having got boring, in 2014 I started taking photos of my village and processing them with Windows' Photo Gallery (for example, sunlit willow twigs reflected in a shadow on the village duck pond, posted to the right of this text box). I was sharing them on google+ and now share them on MeWe, sharing the videos on YouTube.