Hello All,
Here are some charts I made in Cartes du Ciel for seeing 2004 BL86 from my location in suburban Melbourne.
I used a topocentric ephemeris from JPL's HORIZONS system as of about a week ago.
http://ssd.jpl.nasa.gov/?horizons
It included the recent observations from the iTelescope (Q62) but not those from the LCOGT (W87) in the last few days. Uncertainty was down to only about 30 arc-seconds so shouldn't be too bad. However there will be a parallax difference for other locations.
For those using Cartes du Ciel there is a How-To for close asteroid passes that was written for the pass of 2012 DA14 in 2013.
http://www.ap-i.net/skychart/en/docu...isplay_of_neos
2004 BL86 is 3 lunar distances (1.2 million km) so nowhere near as close, much more like (4179) Toutatis in 2004 or 2006 VV2 in 2007.
If you just use CdC's regular asteroid display it will be off by about 1 degree. It just takes the Keplerian elements at a reference epoch from the Minor Planet Center and propagates them to the observation epoch using 2-body methods.
The asteroid will be around mag 10 during the night of 26-27 Jan and will be visible the whole night.
[Edit]
Forgot to say that the asteroid is marked with open diamonds on my charts.
The 10 pm (AEDT) field is near Ksi Puppis and M93.
Peter Thomas
Oakleigh