2017 Geminids : Additional Reports

Visual Reports

Following on from his mammoth effort during the night of Dec 11-12, Tom Banks (Comberbatch, Cheshire) made use of a couple of cloud breaks during Geminid maximum night (Dec 13-14) to spot some Geminids. His first session, between 22:36 and 22:53 UT (50% cloud, increasing to 100%) produced 6 Geminids, while a second session at the end of the night from 06:23 to 07:27 UT (LM 5.0, significant cloud issues 06:33-06:45, twilight at end) produced 16 Geminids and 1 sporadic.

A further meteor watch by Tom during the night of Dec 15-16, illustrated how rapidly Geminid rates fall away in the nights following maximum.  During observations totalling 5 hours 15 minutes (LM 5.3), he recorded 16 meteors, of which just 7 were Geminids.

Alastair McBeath (Morpeth, Northumberland) had longer clearer spells during the night of Dec 13-14.  Observing from 22:39 to 02:46 UT (LM 6.1, around 50 minutes lost to cloud), he saw a total of 202 Geminids and 31 sporadics.  Six of the Geminids were in the fireball category, though none were brighter than magnitude -4.  One of Alastair’s fireballs (at 01:59 UT, travelling from Canis Minor to close to Sirius) may tie in with a  fireball  imaged low in the NW sky by the Bayfordbury camera of the University of Hertfordshire. His other fireballs were seen at 22:57 (Ori), 23:29 (Eri), 02:22 (UMa to Dra), 02:27 (Tau) and 02:44 UT (UMa).

Brendan Shaw (Meshaw, north Devon) observed between 22:49 and 00:35 UT (LM 5.5) during the night of Dec 11-12 in mostly clear skies, seeing 12 Geminids and 1 sporadic. The best meteor was the first – a mag -2 Geminid at 22:51 UT.  He also noted two Geminids appearing only 20 seconds apart at 23:54 UT.

Robin Scagell (Flackwell Heath, Bucks) observed between 01:11 and 02:11 UT (LM ~4.5, passing cloud at times, 5 mins lost due to camera adjustment) on the morning of Dec 14, seeing 33 Geminids and 4 sporadics. the brightest meteors (6 Geminids and 1 sporadic) were of magnitude -2.  Robin also imaged 6 Geminids in a total of 219 20-second exposures using a Canon 70D camera with 17 mm f/2.8 Sigma lens at  ISO 3200.

Robin’s wife Sally, a less experienced observer, monitored a different part of the sky between 01:25 and 02:11 UT, seeing 25 meteors which were probably all Geminids.

Pam Foster (Pitlochry) observed from indoors between 19:40 and 00:40 UT (4 hours observing) on Dec 13-14 and, despite increasing problems with cloud during the final 80 minutes, saw 102 meteors.

Richard Fleet (Wilcot, Hants) reported seeing 5 meteors in good skies, between 23h and 0h UT on Dec 15-16, with just one being a Geminid, once again illustrating the rapid fall off in rates post-maximum.

The sharp fall-off in Geminid ZHRs can also be seen in the  IMO Geminid activity graph

 

Imaging

Bill Ward has now returned from his trip to Tenerife, where was was rewarded with three clear nights adding
Peak ZHR comes in at 128 +/- 11, (03-04 ut on 14th) smashing the 2012 record. Some incredible images and spectra!” .

One of his images is reproduced here and shows a bright Geminid that ended behind a mountain.

A bright Geminid imaged from Tenerife by Bill Ward

One of Bill’s Tweets has led to some interesting debate between experienced meteor observers.

The image is reproduced here and shows a Geminid that appears to have a rather wavy path.

A Geminid meteor with an apparent wavy path, imaged by Bill Ward

 

The subsequent Twitter discussions have focussed on two questions:

– whether some meteors do show “corkscrew”-like motion – some visual observers have in the past reported seeing such effects, but this has been difficult to verify due to the lack of a permanent record.

– whether the wavy motion seen in this image was a genuine property of the meteor or could have been due to the camera being shaken by the wind or the workings of the camera (“mirror slap” has been suggested).

The Twitter discussion can be viewed  here

with more discussion  here

 

Bill has also posted this  time lapse video  showing 29 meteors that he recorded close to the Geminid activity peak from Tenerife.  It is certainly worth waiting for the event 1:10 into the video !

 

Here are three additional Geminid images that were captured by Alex Pratt (Leeds) during the night of Geminid maximum (Dec 13-14).

 

Observing conditions were not ideal, but Alex commented

Fortunately I had intermittent clear spells, with frequent gaps in the blanket of clouds. Video cameras can deliver the goods in these circumstances and a number of meteors were recorded through thin cloud or small gaps in the clouds.”

The first image shows a Geminid heading from Gemini towards Orion and was captured via his SE facing video camera at 22:49:27 UT on Dec 13th.

 

The second image was captured at 03:52:02 UT on Dec 14th via his N facing video camera.

Four stars of the ‘W’ of Cassiopeia can be seen to the left of this meteor.

The fainter streak of light to the left of the meteor is an image artefact and is a consequence of Alex operating this video camera through a window.

 

The third image was captured via Alex’s NW facing video camera at 05:21:30 UT on Dec 14th.

The cloud in this image would have made life difficult and less rewarding for visual observers, but video cameras “don’t care” and continue to record any meteors that appear through cloud gaps.

 

 

Below are four more Geminid images captured by Paul Sutherland (Walmer, Kent) during the night of Dec 13-14.

The times of these meteors were 01:44 UT, 02:20 UT, 02:24 UT and 03:38 UT.

Paul had his camera (Fujifilm X-M1 with Samyang 12mm f2 lens) running from 01.08 UT until 06.35 UT, although twilight was becoming an issue by 06h.  He added “The lack of colour in the Geminids is quite noticeable after the colourful bright meteors provided by the Quadrantids, Perseids and Leonids“.