radar

November Meteors 2018.

Not much chance of visual meteor spotting over the month , but the radar setup based on the Graves 140.05 MHz signal continued to record data.

The maximum number of meteors detected over November was 2701. The average daily rate was 90 with a maximum of 135 on 20th of Nov.

The average hourly rate was 4 (3.8) with a maximum of 21 between 9am and 10am on the 20th.

The major shower in November is the Leonids, active between the 6 -30 with a peak on 17/18,  Also Taurids active between Oct 12 – Dec 2 with the Southern branch peaking on Nov 5 and the Northern Branch on the 12th.

There are also a number of other minor showers active over the month:

Andromedids  peaking on 27th

Theta Aurigids, 15th -21st peak 19th

Omicron Erianids  14th – 29th peak 22nd

Alpha Monocerotoids 13th Nov – 2nd Dec peak 21st

Chi Taurids peak Nov 2nd.

It is difficult to isolate any one shower in the data, but the hourly data shows a definite peak around the 20th, probably the sum of those showers active during that date.

The final chart shows a comparison of data from 2016 -2018, although levels vary , certainly the 2017 and 2018 data seem to mirror each other.

Next month sees the Geminid shower 6th – 19th peaking 13th /14th, with the moon set at around 22:00 there should be some good viewing around midnight. The Ursid shower peaks on the 22nd but a full moon will make observations difficult. Finally if Comet 46P/Wirtanen peaks as predicted it should be easily visible between the Pleiades and Aldebaran on 16th Dec.

August Meteors

Although not visually very active (clouds again!!) the Perseids were very prominent in the  radar data. In my post mid august the data showed a maximum daily rate of 313 on the 13th with a maximum hourly rate of 28 between 2-3am on 12th, and as the hourly plot showed the main activity was between 2 – 8 am hence missed by lots of people even if clear, Ed and Dave at Solarfest went to bed too early!!

The meteor count total for the month was 2999, with an average daily count of 97 and average hourly rate of 4.

The hourly and daily plots are below and for comparison below these  the August  daily count for the last 3 years, interestingly the shower peaked on the 13th in 2018, 2017 but on 12th in 2016, this however is only the daily count and a different set of conditional actions for recording events is now in use.

The final chart is a reposting of the 2018 shower data.

Perseid Shower 2018

The Perseids have been and gone, maximum hourly count was 28 between 2-3 pm on the 12th and the max daily count was 313 on the 13th. The hourly plot between 10th and 16th shows the daily shower distribution quite clearly, maximum activity picking up for 2pm onwards on most days , hence not many being seen, also the majority of counts were of low duration, so most not very bright, there were some longer duration signals associated with fireballs but not many and certainly not bright enough to trigger the all sky camera which I had running when sky was clear.( which wasn’t very often)

July Meteors.

Although the July radiants do not individually produce strong rates, activity from the Aquarius and Capricornus regions in July and early August, as well as minor activity from other radiants, cause hourly rates to basically rise between the middle and end of July for observers in both the Northern and Southern Hemispheres.” ( http://meteorshowersonline.com/july_radiants.html)

Moderate Activity:

Radiant Duration Maximum
Southern Delta Aquarids (SDA) July 14-August 18 July 28/29

Minor Activity

Radiant Duration Maximum
Alpha Lyrids July 9-20 Jul. 14/15
July Phoenicids (PHE) July 9-17 Jul. 14/15
Alpha Pisces Australids July 16-August 13 Jul. 30/31
Sigma Capricornids June 18-July 30 Jul. 10-20
Tau Capricornids June 2?-July 29 Jul. 12/13
Omicron Draconids July 6-28 Jul. 17/18

The total number of meteors detected in July (2018) was 1824, with a mean daily rate of 59 and mean hourly rate of 2.5.

The maximum daily rate was 87 on the 26th July and the maximum hourly rate was 11, between 3-4am on the 27th and 30th.

The daily and hourly rates are shown in the first two charts below

These maxima coincide with the SDA shower and the trends over the month reflect the observation quoted at the start of this post. The trend of increasing activity towards the end of the month is borne out in the last chart below which compares the data over the last three years, the suggested trend is more pronounced in the 2016 and 2017 data than this year .

The Perseids are already with us peaking on the night of the 12/13th August, and with a new / very young moon there should be good viewing conditions as long as the clouds stay away.

April Meteors

The main shower in April is the Lyrids, but as the table below shows there are other showers present as well.

Major Activity:

Radiant Duration Maximum
Lyrids (LYR) April 16-25 Apr. 22

Minor Activity:

Radiant Duration Maximum
Tau Draconids March 13-April 17 Mar. 31-Apr. 2
Librids March 11-May 5 Apr. 17/18
Delta Pavonids March 21-April 8 Apr. 5/6
Pi Puppids (PPU) April 18-25 Apr. 23/24
April Ursids March 18-May 9 Apr. 19/20
Alpha Virginids March 10-May 6 Apr. 7-18
April Virginids April 1-16 Apr. 7/8
Gamma Virginids April 5-21 Apr. 14/15

Daylight Activity:

Radiant Duration Maximum
April Piscids April 8-29 Apr. 20/21

The total meteor activity detected for April was 1790.

The average daily rate was 60 and the average hourly rate 2.5

The max hrly rate was 11  during the hours of 9 & 11 on 30th April

The max dly rate was 93 on 23rd April with hourly counts of 10 during the hours of 4, 9 & 11.

Maximum activity for the Lyrids occurred during daylight as did a lot of this months activity.

The daily rate graph and hourly rate graph are listed below, the Lyrid max is marked on both, the daily rate for 2017 is also included for comparison, it would appear more meteors were detected this year. The month of May brings the Eta Aquarids over the weekend of the 5th/6th, which will be competing with a bright waning Gibbous moon.

Pete H

 

February Meteors.

February is not noted for its meteor showers, only a handful of minor showers and some daytime showers.

Minor Activity

Radiant Duration Maximum
Aurigids January 31-February 23 Feb. 5-10
Alpha Centaurids (ACE) February 2-25 Feb. 8/9
Beta Centaurids February 2-25 Feb. 8/9
Delta Leonids (DLE) February 5-March 19 Feb. 22/23
Sigma Leonids February 9-March 13 Feb. 25/26

Daylight Activity

Radiant Duration Maximum
Capricornids-Sagittariids January 13-February 28 Jan. 30-Feb. 3
Chi Capricornids January 29-February 28 Feb. 13/14

The radar reflections using Graves, gave a total count of 1140 meteors, with an average daily count of 41 and average hourly count of 2 (1.7), the max hourly count observed was 7 and max daily count 62. The contributions to activity from the Centaurids , Leonids and Capricornids are discernible on the charts below. March is another month of no notable shower, but lots of minor showers.

Clear Skies

Pete H

 


January Meteors.

The main meteor activity this month around the 3rd/4th of January with the Quadrantids peaking in the early hours of the 4th Jan. Graves decided to go off line between 09:00 and 15:00 on the 3rd Jan. ( see red block on hourly plot).

The average hourly rate during the month was 2.2, with an average daily rate of 52.3. The variations during the month are due to the combinations of minor showers during the month, these are listed in table below.

I omitted the total count for 2017 in my new year post, this was 16,727with an average daily count of 46. It will be interesting to see what Andy’s magnetic collector picks up over the year.

 

Radiant Duration Maximum
Zeta Aurigids December 11-January 21 Dec. 31/Jan. 1
January Boötids January 9-18 Jan. 16-18
Delta Cancrids (DCA) December 14-February 14 Jan. 17
Canids January 13-30 Jan. 24/25
Eta Carinids January 14-27 Jan. 21/22
Eta Craterids January 11-22 Jan. 16/17
January Draconids January 10-24 Jan. 13-16
Rho Geminids December 28-January 28 Jan. 8/9
Alpha Hydrids January 15-30 Jan. 20/21
Alpha Leonids January 13-February 13 Jan. 24-31
Gamma Velids January 1-17 Jan. 5-8

 

Barton All Sky & Meteor Observatory (BASMO)

The Barton All Sky & Meteor Observatory (BASMO) is now operational with the addition of the All Sky camera and realignment of aerial which has started to work loose in mount. The radio section detects the reflections of the Graves Radar signal (near |Dijon) 143.05 MHz detected using the Yagi aerial( az 140 deg , inclination 20 deg) connected to a Fundongle pro+  and signal processed using SpectrumLab on laptop. The Allsky camera runs using Ispy and is set to record video if motion detected in the selected sectors. Unfortunately the All sky camera will not show the meteors detected by the radar ( usually over southern England/ channel/ France)

Images below as follows:

  1. BASMO aerial and Allsky camera
  2. BASMO attachment of camera using wickes bracket suggested by Ed
  3. BASMO Meteor detection top, allsky camera feed bottom.
  4. Radar meteor detection, long duration trace as meteor “burns” up leaving ionised trail
  5. Radar meteor detection showing Doppler shift of approx. 100Hz as meteor approaching Graves signal slows in atmosphere.
  6. BASMO  All Sky camera pointers.
  7. All sky camera and rain drops, design fault ,Ed forgot to include wiper blades!

Click on the links to show videos .

  1. Video clip showing effect of raindrops, giving false movement as security light comes on. falsemove
  2. Video clip showing Plane overhead. Plane
  3. Video clip showing Meteor trace, probably a Draconid. Meteor

September meteors

Hi

below are the daily and hourly rates for meteors this month, average daily count of 48 and av hourly count of 2. No major showers,

Next month the Orionids peaking on 21st, the activity is already at 80+ counts with the Sextantids (daylight shower) and the Eta Cetids and October Cetids all active at the start of October.

 

Pete Hill

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

September Meteors: Minor Activity

Radiant Duration Maximum
Gamma Aquarids September 1-14 Sept. 7/8
Aries-Triangulids September 12 (?) Sept. 12
Alpha Aurigids (AUR) August 25-September 6 Sept. 1/2
Eta Draconids August 28-September 23 Sept. 12/13
Gamma Piscids August 26-October 22 Sept. 23/24
Southern Piscids (SPI) August 12-October 7 Sept. 11-20