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We report on narrowband photometry and extensive imaging observations ofcomet C/Lulin (2007 N3) obtained at Lowell Observatory during 2008 and 2009.Enhanced CN images revealed a double corkscrew morphology with two near-polarjets oriented approximately east-west, and both CN and dust images showednightly rotational variability and seasonal changes in bulk morphology. Wedetermined a rotational pole direction of RA/Dec = 81/+29 with an obliquity of97 deg, and a sidereal rotation period of 41.45 +/- 0.05 hr. Monte Carlonumerical modeling best replicated the observed CN features with an easternsource area at lat/long -80/125 and a 10 deg radius and a western source areaat lat/long +77/245 and a 20 deg radius, 4 times larger than the easternsource. An additional small, near-equatorial source was necessary to reproducesome dust features. Water morphology, based on OH, was quite different thanthat of the carbon-bearing species, implying a different driver for the polarjets such as CO or CO2. Ion tails were detected in decontaminated images fromboth the dust and NH filters, likely being H2O+ and OH+, respectively. Wemeasured water production both before and after perihelion, and extrapolatepeak water production at perihelion to be about 1.0*10^29 molecules/s. Weestimate an active fraction of only 4-5% and a nucleus radius of up to ~8 km.Our data suggest that Lulin, defined as dynamically new in a statistical sense,behaves more like a long-period comet due to its nearly asteroidal earlyappearance, isolated source regions, and dust properties.

Coma Morphology, Numerical Modeling, and Production Rates for Comet C/Lulin (2007 N3)