74p 20180420 cbell

74P/Smirnova-Chernykh 2018-Apr-20 04:12:12 UTC stack 4 x 600 secs Sky motion 0.19 "/min PA 264.5 deg Magnitude 16.5 R aperture radius 10.25 arc sec UCAC4 Coma 29" x 22" extended pa 290 deg Tail 1.6 arc minutes PA 290 deg Charles Bell H47 Vicksburg 0.3-m Schmidt-Cassegrain + CCD + R filter Ephemeris data: t - T = +83.37492 days Delta = 2.760 AU r = 3.549 AU Elongation = 135.7 deg Phase = 11.4 deg PsAng = 22.1 deg PsAMV = 293.0 deg PlAng = -1.deg Constellation: Leo The positiion angle of the tail is near the PA of the negative velcity vector indicating heavier dust particles giving only a small curvature.

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