Geminids 2022

[rsfoto]

Hi Guys,

Looks like the Geminids are very active ...

What about your results ?

RMO_Ehlert_20221214.JPG (48.29 KiB) Viewed 1765 times

My reference RMO in USA

RMO_Nelson_20221214.JPG (51.65 KiB) Viewed 1765 times

[Montana]

I think Mary McIntyre is getting loads of Geminids on her all sky camera, it is going wild. Looks to be a good shower.

Alexandra

[Carbon60]

You beat me to it, Rainer

Here are my results (so far). Yep....it's a great shower.

Geminids_20221214.jpg (139.65 KiB) Viewed 1754 times

I've converted some data into what I'm calling an 'event map', which basically aims to plot the meteor activity on a blow-by-blow basis as it happened in real time. The objective is to show the underlying shower pattern. As may be seen, the meteors arrive in waves (this is for Dec 13th), bunching at times with gaps at other times. The resulting chart looks a bit like a bar code. I also calculated an apparent hourly rate based on counting the seconds between three consecutive events on a rolling basis. This gives a higher peak rate than the traditional way of averaging over a longer period, but again the idea was to show in some detail the underlying pattern in the debris field. Anyhow, here are the resulting charts:

Geminids_Event Mapping_20221213.jpg (224.82 KiB) Viewed 1754 times

Clearly, the ability to detect using a remote transmitter changes with time as the shower's radiant rotates around the sky through 24 hrs, hence the lower count rate during about 10:00 am to 9:00 pm.

Hopefully this makes sense.

Stu.

[rsfoto]

Hi,

Looks like all is over ...

RMO_Ehlert_20221215.JPG (51.07 KiB) Viewed 1723 times

[Carbon60]

Nice results, Rainer.

I got the same. The peak was over night 13th/14th.

Geminids_20221215.jpg (144.05 KiB) Viewed 1716 times

I've also plotted 'event maps' for 12th, 13th and 14th, which show the concentrations overnight when meteors are most readily detected from my location and how the counts change with time over the observation period.

Geminids_Event Mapping_20221213_14.jpg (631.77 KiB) Viewed 1716 times

Stu

[Montana]

I saw two this morning, is there another peak? One while I was driving and the other just as I stepped out the car in the car park. The odds of that is very unusual as I wasn't even trying. Would be interesting to know what the morning of the 16th is like 06-07:00 UTC

Alexandra

[Carbon60]

I saw two this morning, is there another peak? One while I was driving and the other just as I stepped out the car in the car park. The odds of that is very unusual as I wasn't even trying. Would be interesting to know what the morning of the 16th is like 06-07:00 UTC

Alexandra

Hi Alexandra,

I've checked my data and there was no peak at the the time in question. I think you got lucky (twice).

Here's my event map, showing everything detected during the night and morning of the 16th.

20221216_Geminid Event Map_Morning.jpg (66.11 KiB) Viewed 1666 times

Maybe you should play the lottery this weekend

Stu.

[MapleRidge]

Great observations Rainer and Stuart

Too many clouds to get a visual attempt in I'm afraid.

Brian

[Wyvern]

Hi all,
Just stopped my detection system to sort out the results. Lost a couple of hours worth due to some system fault, but restarted as soon as I noticed anyhow. I've combined the two "heatmaps" produced, but beware of comparing the later three days "colours" against the earlier results. The graph does show a nice maximum and some pulses of activity. There is an interesting pulse 05-06UT on the morning of the 16th, still continuing at a lower level into 06-07UT. Whether this is what Montana caught I don't know, but possible? All in all a good display from the Geminids this year.
Regards to all,
Les

[Carbon60]

Good data, Les.

Stu.

[Carbon60]

Here's my full plot throughout the event.

Geminids_20221217.jpg (140.49 KiB) Viewed 1591 times

...and a chart showing the average hourly rate measured overnight for 7th-16th

Geminids_202212_7th_16th Averaged overnight hourly rate.jpg (75.77 KiB) Viewed 1591 times

Stu.

[Montana]

Thanks Les, that is really interesting. My two meteors were 06:45 and 07:15 now I wish I had been up at 5am

Alexandra

[MapleRidge]

Great graphic of your data Stu

Brian

[Carbon60]

With Rainer's permission, I've plotted his and mine in the same format.
Les, if you send me your .txt files (through PM) I can do the same, if you like.

Anyhow, here are Rainer's and mine:

Stuart_Rainer_Geminid Data 202212_10th_18th.jpg (147.68 KiB) Viewed 1494 times

You'll see that Rainer's setup captures significantly more events than my own. It depends on the location and power of the transmitter among other things.
Interestingly, the peaks are bi-modal, with dips in the centre, which Rainer's data show extremely well. This results from the shape of the power field around the transmitter and the alignment position of the meteor radiant, which, of course, rotates across the sky during the course of the day/night. Transmitters typically produce lobes of more concentrated power, giving stronger reflections and this is what we are seeing in Rainer's data (my own too).

Note also that the peaks in Rainer's data are offset compared with my own. This results from our different positions on the planet (roughly 90 degrees apart- 6 hrs in time).

I hope you find this interesting.

Stu.

[rsfoto]

Hi Stuart,

I am using RF channel 7 television transmitters in USA, (Pilot tone 174.31MHz) and pointing my antenna at azimuth 7° with an elevation of 12°. MY Antenna is a simple 4 element YAGI. One reflector, one dipole and 2 directors.

I assume you use the Graves radar in France at 143.05MHz and that is only one transmitter.

Maybe that makes the difference ?

You could try and point your antenna to the eastern countries on the 54MHz transmitters. OK, that would imply building a bigger Antenna. There are still some Band I transmitters active. https://en.wikipedia.org/wiki/Band_I

Rainer_RMO_174.31MHz.jpg (1.66 MiB) Viewed 1469 times