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.