There is an asymmetry of the thermal IR emission around perihelion similar to the lightcurve, CN and C 2 values. No coma apparent. All four periods show up in both data sets. Adopting an albedo of 0.04, they derive a radius of 4.5 km. A'Hearn, M. F. et al.
Asymmetry decreases with increasing distance from nucleus.
Strong color gradient with outer coma very blue. Front fan reddest Fan lag angle is about 23 degrees from solar. Flow seems collimated. Dust production roughly constant with heliocentric distance. IUE observations on 24 Oct and 3 to 5 Nov 1980.