This answer (viewable to those with rep > 10k on "alpha sites", 2k on beta) to the question Which star did Uranus occult in 1977 when the planet's rings were discovered? seems useful. The author never responded to the comment asking for a link unfortunately.
A month later, a moderator with the current description "I work for Stack Overflow as a Senior Product Support Specialist." deleted it.
Is it possible to know why in this case?
The Circular number is easily found. Is it possible to undelete this answer and just add the link to the source http://www.cbat.eps.harvard.edu/iauc/03000/03051.html I can't really understand why the answer was deleted. The material seems quite relevant and with the link, the answer has value as it helps readers know of a new way to look up information on occultations.
If the answer is deleted for a serious reason (I can't even vote to undelete!) then I suppose it could be re-created by a different user, but the author is active here so it's probably more appropriate to recover the answer.