If you read any of those you would know the answer. It's Saturn.
This field is right near the Ecliptic (the plane of the solar system in the sky) so it was probably always going to be a solar system object. If you look up the IRAS object catalogs you find these sources were saturated which means it was probably a Planet. I did a search on IPAC/IRSA's IRAS minor planet catalog. These objects were not included because they're saturated (and are not minor planets) but from that I found other entries in the same field which tells you the date this field was observed 14/07/83 at about noon in UT time. From this I can simply look up to coordinates of all the planets that day and Saturn was right there. The double object is because the field was exposed twice and stacks as the source catalog shows. The arc will just be an effect of the extremely bright object, in the other bands you can see the objects have big streaks not arcs. The saturated images are probably why the image was cut out of the reprocessed version, it's bad data. None of this stuff appears in more recent AKARI maps at similar wavelengths but background galactic cirrus does. That's a much better test than microwaves because it's much closer in wavelength, hence the microwave hotspot is almost certainly unrelated.
It's not the end of the world or biblical, it's Saturn.
Image for some proof. You can see the date the image was taken in in the table data at the bottom (8307 - 1983 07, 14.44 - the 14th at ~11 am). You can also see that date is in the ephemeris program I used showing it's Saturn. Mystery solved.