British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

Home Forums Meteors
Terms of use

Geminids 2020

2 posts / 0 new
Last post
BillW's picture
Offline
Last seen: 1 week 7 hours ago
Joined: 05/03/2014 - 08:50
Geminids 2020

Hi,

Some early results... despite the poor weather I managed to get a few spectra on the night on 12/13 Dec. Unfortunately as most were fairly early on, the radiant was low and the dispersion angle was quite poor. I was hoping it would stay clear until the radiant was higher with the gratings better orientated, so much for that idea....

Anyway got one decent resolution, partial spectrum showing the Mg and Na lines with some weaker Fe and ca lines.

This graph shows the relatively stronger Mg emission (~517nm) compared with Na (~589nm). This is a flux instrument corrected spectrum to try and accurately portray the Mg/Na difference.

The reduced Na line is attributed to loss of the volatiles due to the orbit of Phaethon 3200. It is interesting to compare with previous observations.

This is a spectrum multiplot from 2017. Although spanning a greater wavelength range it can be seen that the relative strengths of the Mg and Na lines are broadly consistent with this years observations.

Cheers,

Bill.

A R Pratt's picture
Offline
Last seen: 11 hours 11 min ago
Joined: 04/03/2014 - 14:01
Geminid 2020 12 12 20:24:47

Hi Bill,

I caught that meteor on my Leeds_N camera and it confirms it was a Geminid (apparent mag. 0.5 from here).

The fainter trail above it was a mag. 2 December alpha Draconid which appeared 2.5 s later.

The weather has cooperated better than expected and my cameras have recorded hundreds of Geminids - keeping me busy.

Clear skies,

      Alex.