NavList:

I used Astron’s inter-body arc facility, which gives the minimum geocentric separation at 14:53:15 UT and a distance of 0° 18.3862′, or 0° 18′ 23.175″. It lists the distance at the input time, so I needed to spend about 3 minutes doing a poor man’s binary search (guessing and halving) to find the start and end times of when the minimum remained unchanged, then taking their mean. (Constant 18.3862′ between 14:52:15 and 14:54:15).

Here is a summary of contributions to date, converted to UT and DM.m format. I have added python / Skyfield's values too. Obviously Astron cannot compete with the 'big boys', but is still well within observable limits. 

I included the arc facility to possibly help with sextant calibration, listing the sextant arc between stars, or between selected limbs of nearer bodies. The geocentric option was added later.

Bill