orbit analysis (UFOCapture, UFOAnalyser and UFOOrbit; @sonota09). Our goal is to provide a more complex description of meteor showers related to the comet C/1917 F1 Mellish and reveal some of their obscured characteristics. The eventual objective is the investigation of the orbital evolution of meteors and the parent comet, and determination of ejection velocities near the perihelion.

![Orbits of December Monocerotids and November Orionids selected from the SonotaCo database of video orbits.](fig1-a.eps){width="8cm"}

![Orbits of December Monocerotids and November Orionids selected from the SonotaCo database of video orbits.](fig1-b.eps){width="8cm"}

\[F1\]

![image](fig2-a.eps){width="7.2cm"} ![image](fig2-e.eps){width="7.2cm"}

![image](fig2-i.eps){width="7.2cm"} ![image](fig2-q.eps){width="7.2cm"}

![image](fig2-vg.eps){width="7.2cm"} ![image](fig2-lonperi.eps){width="7.2cm"}

\[F3\]

                   element                          value
  ------------------------------------------ -------------------
                      a                         27.6473325 AU
                      e                           0.993121
                      q                          0.190186 AU
                      i                        32.6828$^\circ$
                   $\omega$                   121.3190$^\circ$
                   $\Omega$                    88.6683$^\circ$
                      M                       0.0259325$^\circ$
                  epoch (JD)                      2421334.0
   heliocentric distance of Ascending Node       0.783556 AU
   heliocentric distance of Descending Node      0.250005 AU

  : Orbital elements of the comet C/1917 F1 Mellish in equinox J2000 reference frame (JPL).[]{data-label="t1"}

December Monocerotids and November Orionids from SonotaCo database
==================================================================

The freely accessible database of the meteors detected by the SonotaCo network contains $64 540$ multi-station meteor orbits with additional parameters such as the beginning and terminal height, absolute magnitude, equatoreal and ecliptical coordinates of the radiant, the stream assignment, etc. Although the SonotaCo 