This year RAMBo has recorded a strong Ursidi activity.
In the attached graphics you can see that the maximun has begun at 270,800 of solar longitude.
The first graphic shows the mass behaviour, the second one (red) shows the Hourly Rate.
More informations on our web site
www.ramboms.com

Lorenzo Barbieri
5863b911d205a.jpg

This year RAMBo has recorded a strong Ursidi activity. In the attached graphics you can see that the maximun has begun at 270,800 of solar longitude. The first graphic shows the mass behaviour, the second one (red) shows the Hourly Rate. More informations on our web site www.ramboms.com Lorenzo Barbieri ![5863b911d205a.jpg](serve/attachment&path=5863b911d205a.jpg)

Dear Lorenzo,

I also read in the past weeks, that the radio activity of the 2016 Ursids seemed to be more important than usual gfrom observers in the Netherlands. I did not see anybody reporting unusually high activity in visual, but weather may not allow people to observe too much.
Can anyone else confirm the 2016 Ursid activity was definitively higher than usual this year, and does anyone reported higher visual Ursid activity, too?
I remember Jérémie Vaubaillon predicted some potential Ursid activity increase for this year, especially on December 22-23 and 23-24, around 00h UT. Maybe it could be an explanation?

Best regards, and clear skies!
Karl

Dear Lorenzo, I also read in the past weeks, that the radio activity of the 2016 Ursids seemed to be more important than usual gfrom observers in the Netherlands. I did not see anybody reporting unusually high activity in visual, but weather may not allow people to observe too much. Can anyone else confirm the 2016 Ursid activity was definitively higher than usual this year, and does anyone reported higher visual Ursid activity, too? I remember Jérémie Vaubaillon predicted some potential Ursid activity increase for this year, especially on December 22-23 and 23-24, around 00h UT. Maybe it could be an explanation? Best regards, and clear skies! Karl
edited Jan 4 at 9:00 am

Dear Karl,

I observed the Ursids under good weather conditions on december 22. between 02:00 and 0610 UT. My main goal was to capture some Ursids on camera, so i had not prepared well enough for a visual watch, and not learned a useful counting field for determination of the limiting magnitude. From my experience, i can only suggest that the limiting magnitude was around 6.0 for the entire watch. Because of this, the results was not reported to the IMO, but i will post it here. Numbers and Magnitude distribution for the Ursids, Sporadics and Leo Minorids as follows:

02:00 - 03: 00 UT

Ursids: 1(2), 3, 4, 5, 6 = 6 meteors.
Sporadics: 2, 3(2), 4 = 4 meteors.
Leo Minorids: 2 = 1 meteor.

03:10 - 04:10 UT

Ursids: 2, 3, 4, 6 = 4 meteors.
Sporadics: -1, 1(3), 2(2), 3(2) = 8 meteors
Leo Minorids: 1 = 1 meteor.

04:10 - 05:10 UT Break between 04:30 and 04:32

Ursids: -4, -1, 0, 2, 3, 4, 5 = 7 meteors
Sporadics: 1, 2, 3, 4(2), 5 = 6 meteors
Leo Minorids: 0 = 1 meteor

05:10 - 06:10 Break between 05:23 and 05:27

Ursids: 0, 2(2), 3, 4 = 5 meteors.
Sporadics: 1, 2, 3(2), 5(2) = 6 meteors.
Leo Minorids: No meteors.

The uncorrigated hourly rate for the Ursids, was between 4 and 7 for the entire watch. Between 04:10 and 04:35 there was an increase in bright Ursids, with 3 meteors of magnitude 0, -1 and -4.

Best regards,
Kai.

Dear Karl, I observed the Ursids under good weather conditions on december 22. between 02:00 and 0610 UT. My main goal was to capture some Ursids on camera, so i had not prepared well enough for a visual watch, and not learned a useful counting field for determination of the limiting magnitude. From my experience, i can only suggest that the limiting magnitude was around 6.0 for the entire watch. Because of this, the results was not reported to the IMO, but i will post it here. Numbers and Magnitude distribution for the Ursids, Sporadics and Leo Minorids as follows: 02:00 - 03: 00 UT Ursids: 1(2), 3, 4, 5, 6 = 6 meteors. Sporadics: 2, 3(2), 4 = 4 meteors. Leo Minorids: 2 = 1 meteor. 03:10 - 04:10 UT Ursids: 2, 3, 4, 6 = 4 meteors. Sporadics: -1, 1(3), 2(2), 3(2) = 8 meteors Leo Minorids: 1 = 1 meteor. 04:10 - 05:10 UT Break between 04:30 and 04:32 Ursids: -4, -1, 0, 2, 3, 4, 5 = 7 meteors Sporadics: 1, 2, 3, 4(2), 5 = 6 meteors Leo Minorids: 0 = 1 meteor 05:10 - 06:10 Break between 05:23 and 05:27 Ursids: 0, 2(2), 3, 4 = 5 meteors. Sporadics: 1, 2, 3(2), 5(2) = 6 meteors. Leo Minorids: No meteors. The uncorrigated hourly rate for the Ursids, was between 4 and 7 for the entire watch. Between 04:10 and 04:35 there was an increase in bright Ursids, with 3 meteors of magnitude 0, -1 and -4. Best regards, Kai.

Dear Kai,

Thanks for your Ursids unformal report!
Can you please tell us where you have been observing from (in latitude/longitude) ? Just for us to have a guess on the height of the Ursid radiant above you horizon, and thus deduce a calculated theoritical ZHR from your report, assuming the lm was +6.0.
Thanks in advance! That will be interesting to see what was the ZHR before the radio peak, and correlate it with the radio activity, to better understand what could have been the visual ZHR during the radio enhanced activity (even if this radio peak may have been non-noticable with visual observations, especially if it's associated to faint meteors/small meteoroids).

By the way, we published a short note on the topic on the IMO website: http://www.imo.net/enhanced-radio-activity-of-2016-ursids/
And Mikhail Maslov answered that this activity enhancement could be linked to the 8P/Tuttle comet 1076 dust trail: http://feraj.ru/Radiants/Predictions/8p-ids2016eng.html

Clea skies!
Karl

Dear Kai, Thanks for your Ursids unformal report! Can you please tell us where you have been observing from (in latitude/longitude) ? Just for us to have a guess on the height of the Ursid radiant above you horizon, and thus deduce a calculated theoritical ZHR from your report, assuming the lm was +6.0. Thanks in advance! That will be interesting to see what was the ZHR before the radio peak, and correlate it with the radio activity, to better understand what could have been the visual ZHR during the radio enhanced activity (even if this radio peak may have been non-noticable with visual observations, especially if it's associated to faint meteors/small meteoroids). By the way, we published a short note on the topic on the IMO website: http://www.imo.net/enhanced-radio-activity-of-2016-ursids/ And Mikhail Maslov answered that this activity enhancement could be linked to the 8P/Tuttle comet 1076 dust trail: http://feraj.ru/Radiants/Predictions/8p-ids2016eng.html Clea skies! Karl

Dear Karl,

Thank you for interesting information about the 1076 dust trail! I was one of the few lucky observers of the 1986 outburst, so i know that this shower has the potential to suprise the observer! This year i got a lucky shot of a -4 Ursid fireball with my camera, definitely worth every hour of lost sleep! So i cross my fingers for good weather on the 2017 encounter, and promise to leave a formal report of that event. smile I observed from the following location:

Location Norway
Geo Loc: 60.3238° / 10.6437°
Elevation: 455.1560m

Clear skies!

Kai

Dear Karl, Thank you for interesting information about the 1076 dust trail! I was one of the few lucky observers of the 1986 outburst, so i know that this shower has the potential to suprise the observer! This year i got a lucky shot of a -4 Ursid fireball with my camera, definitely worth every hour of lost sleep! So i cross my fingers for good weather on the 2017 encounter, and promise to leave a formal report of that event. :) I observed from the following location: Location Norway Geo Loc: 60.3238° / 10.6437° Elevation: 455.1560m Clear skies! Kai

Hi all,

For your information, the CBAT (Central Bureau for Astronomical Telegrams) issued an electronic telegram on the topic.
Here it is:

Subject: CBET 4363: 20170220 : URSIDS METEORS 2016

Electronic Telegram No.4363

Central Bureau for Astronomical Telegrams
Mailing address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network

URSIDS METEORS 2016

P. Jenniskens, SETI Institute and NASA Ames Research Center, reports that the earth encountered the A.D. 1076 ejected dust of comet 8P/Tuttle on 2016 Dec. 22d11h35m UTC, at solar longitude 270.825 +/- 0.010 deg (equinox J2000.0). The Ursid meteor shower rates increased during the time encompassing the span of solar longitude 0.13 +/- 0.03 degrees (full-width-at-half-maximum). In California, the "Cameras for Allsky Meteor Surveillance" project detected 3, 5, 5, 3, 2, 0, 0, 2, 4, 2, 2, 4, 5, 6, 3, 7, 8, 9, 21, 24, 16, 16, 15, 15, 7, 7, and 5 Ursids, in intervals of 0.02 degrees starting at 270.44 degrees solar longitude, during a clear and transparent night.
Meteors radiated from a geocentric radiant R.A. = 219.1 +/- 3.9 deg, Dec. = +75.6 +/- 0.9 deg, with velocity v_g = 33.1 +/- 0.9 km/s.

E. Lyytinen, Helsinki, Finland, had calculated an encounter with the A.D. 1076 dust ejecta of 8P/Tuttle at 2016 Dec. 22d10h05m UTC, at solar longitude 270.760 deg (cf. Jenniskens 2006, Meteor Showers and Their Parent Comets, p. 641).

H. Sugimoto of Japan first noticed elevated meteor rates during 270.72-271.05 degrees solar longitude in compiled radio forward-meteor-scatter observations by the worldwide online Radio Meteor Observatory (cf. website URL http://www5f.biglobe.ne.jp/~hro/Flash/2016/URS/index.html).

F. Verbelen at Kampenhout, Belgium, reported a weighted averaged hourly count of overdense reflections centered on solar longitude 270.825 +/-0.010 degrees, with FWHM = 0.20 +/- 0.05 degrees, in good agreement (cf. website URL http://www.imo.net/enhanced-radio-activity-of-2016-ursids/).
This activity is now confirmed to have come from the Ursid meteor shower.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

                     (C) Copyright 2017 CBAT

2017 February 20 (CBET 4363) Daniel W. E. Green

Hi all, For your information, the CBAT (Central Bureau for Astronomical Telegrams) issued an electronic telegram on the topic. Here it is: Subject: CBET 4363: 20170220 : URSIDS METEORS 2016 Electronic Telegram No.4363 Central Bureau for Astronomical Telegrams Mailing address:  Hoffman Lab 209; Harvard University;  20 Oxford St.; Cambridge, MA  02138; U.S.A. e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network URSIDS METEORS 2016 P. Jenniskens, SETI Institute and NASA Ames Research Center, reports that the earth encountered the A.D. 1076 ejected dust of comet 8P/Tuttle on 2016 Dec. 22d11h35m UTC, at solar longitude 270.825 +/- 0.010 deg (equinox J2000.0).  The Ursid meteor shower rates increased during the time encompassing the span of solar longitude 0.13 +/- 0.03 degrees (full-width-at-half-maximum).  In California, the "Cameras for Allsky Meteor Surveillance" project detected 3, 5, 5, 3, 2, 0, 0, 2, 4, 2, 2, 4, 5, 6, 3, 7, 8, 9, 21, 24, 16, 16, 15, 15, 7, 7, and 5 Ursids, in intervals of 0.02 degrees starting at 270.44 degrees solar longitude, during a clear and transparent night. Meteors radiated from a geocentric radiant R.A. = 219.1 +/- 3.9 deg, Dec. = +75.6 +/- 0.9 deg, with velocity v_g = 33.1 +/- 0.9 km/s. E. Lyytinen, Helsinki, Finland, had calculated an encounter with the A.D. 1076 dust ejecta of 8P/Tuttle at 2016 Dec. 22d10h05m UTC, at solar longitude 270.760 deg (cf. Jenniskens 2006, *Meteor Showers and Their Parent Comets*, p. 641). H. Sugimoto of Japan first noticed elevated meteor rates during 270.72-271.05 degrees solar longitude in compiled radio forward-meteor-scatter observations by the worldwide online Radio Meteor Observatory (cf. website URL http://www5f.biglobe.ne.jp/~hro/Flash/2016/URS/index.html). F. Verbelen at Kampenhout, Belgium, reported a weighted averaged hourly count of overdense reflections centered on solar longitude 270.825 +/-0.010 degrees, with FWHM = 0.20 +/- 0.05 degrees, in good agreement (cf. website URL http://www.imo.net/enhanced-radio-activity-of-2016-ursids/). This activity is now confirmed to have come from the Ursid meteor shower. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.                          (C) Copyright 2017 CBAT 2017 February 20                 (CBET 4363)              Daniel W. E. Green
edited Feb 21 at 11:26 pm

Ursids 2016 were clouded out for the Benelux.
My last clear and moonless Ursid campaign is already 16 years ago... But the 2000 event in the morning of December 22th was a special one with enhanced activity in progress to an outburst peak for our American observers...

https://leonid.arc.nasa.gov/leonidnews28.html

Michel.

Ursids 2016 were clouded out for the Benelux. My last clear and moonless Ursid campaign is already 16 years ago... But the 2000 event in the morning of December 22th was a special one with enhanced activity in progress to an outburst peak for our American observers... https://leonid.arc.nasa.gov/leonidnews28.html Michel.
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