Yes, Andrew, J2000. Impressive homework! I'm curious about the object name you ID'd. Which catalog were you using?
Simbad's ID for the object at those coordinates (10 40 18 -59 49 12.5) is 2MASS J18000950-5859007. The field shown has a radius of 2 arcmin and 4 IR sources are nearby. But there's no info on the object itself. The other ID cited is USNO-B1.0 0310-00697514. Four IR objects are within 1 arcmin, but no distances are provided.
NED comes up with 6 Xray sources near those coordinates. The source paper is
arXiv:1211.4612.v2. The authors use only the name SWB1, though the paper is richly detailed in other regards. The paper is longish but good read. One of the co-authors is David Arnett, who the book '
Supernovae and Nucleosynthesis', the best I've seen on the subject.
If you spot the object could you tell us what you find. It's way too faint for my limited equipment. Cheers, Dana