It's easy to make shaped balloons with mylar/foil. For example the EID balloons we keep sharing in this thread.
The metallic Eid balloons are
not Mylar (to my surprise), that was the point of my post. And the cited website claims it's difficult to make (party) balloons out of Mylar. Some of the links below give (very basic) indications of foil balloon composition.
we can exclude shaped mylar/foil balloons as they would not be transparent (the EID balloons are out)
The terms foil balloon and Mylar balloon are not interchangeable.
Foil balloons are often a metallic spray, nylon and [non-BoPET] polyethylene laminate. I don't think we have sufficient information to say
all foil balloons, including those retailing in the middle east, all have the same composition and precisely the same IR characteristics.
If anything, use of Mylar per se for party balloons seems quite rare, which surprised me
I assumed all metallic balloons were some sort of BoPET material like Mylar.
External Quote:
The balloon industry refers to them as "foil" balloons, because they are made of nylon sheet, coated on one side with polyethylene and metallized on the other. It's evidently so much harder to make balloons out of aluminized Mylar (and probably so much more expensive) that nobody does it.
(From "BalloonHQ" website, quoted in the above post).
...there are metallic-appearance latex party balloons and nylon/ polyethylene metallized party balloons.
I have absolutely no idea if their respective IR signatures / opacity/ reflectivity etc. differ significantly from "traditional" coloured latex or true BoPET products.
Popular packs of Eid party balloons (and similar packs for end of Ramadan, also weddings etc.) often seem to combine foil balloons (metallized nylon backed with a polyethylene but not BoPET)
and latex balloons; example ads. on "Amazon"
here,
here and
here.
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But the object isn't a cube — the 1m rough estimate is height (based on the door frame for reference), and is very roughly twice as tall as it is wide. The height includes the odd hanging bits on the bottom, which make up very roughly half the height.
So we're probably looking at something that is closer to half a meter around
Perhaps we're talking at cross purposes to some extent. I'm not proposing the object is a cube (duh!), or that it contains a specific number of balloons, just that a sufficient number of "standard" party balloons to account for the shape of the main body of the object (not the dangly bits) might fit within an approx. 1 metre cube.
Our size estimates are, well, estimates. I don't at the moment think it's been convincingly shown that the object's height is
necessarily 1 metre or less, and that we should therefore reject explanations requiring modestly larger dimensions.
Adverts for packs of Eid party balloons on Amazon often give the width of the crescent balloon as either 18 inches (approx. 45 cm) or 24 inches (approx. 60 cm); e.g.
here,
here and
here.
Where other posters have done analysis I think it strongly supports the object's movements as being consistent with a balloon or number of balloons.
Although it might not be the explanation- I take the point that
maybe all foil balloons are too IR-opaque to account for our imagery (though most are NOT Mylar)- I'm still interested in
@Eburacum's idea regarding Eid balloons (similar crescent and crescent-and-star balloons feature in other commemorative balloon packs).
Most of these packs also contain ribbons or streamers; some contain a curling tool for those.
If some of the "balloon-shaped" balloons were partially or largely deflated I feel it might account for the shape of the object, and I don't think the size is prohibitive: