29p 20161025 0809 jdrummond

I just got some astrometry of 29P tonight (2016 Oct 25.34 UT). It is ~12’ SE of Mars. 29P is indeed in outburst! See below...
 
There is a greater coma extension to the ~NW of the nucleus. Based on the small-angle-formula, a distance to 29P of 903,166,442 km and a radius of 12” I get an outer coma radius of 52,544km from the nucleus. Images attached.
 

clip_image002

 

Where:

D = linear size (Diameter) of an object

a = angular size of object, in arcsec (")

d = distance to the object

206,265 are the number of arc seconds in a complete circle (360/60/60) – i.e. 360 / 2 p