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Geminids 2011: visual data quicklook

Introduction

This page shows automated results of the Geminids 2011, based on visual observations by volunteers astronomers collected through the report form of the International Meteor Organization (IMO). The information on this page is generated automatically; for scientific use please refer to manual analyses published in scientific journals (such as WGN). Send your feedback regarding this page to Geert Barentsen.

Page contents:

Immy Activity profile
Immy Observer statistics
Immy Data access
Immy Credits and references

Note that the data will finally go into the Visual Meteor Database (VMDB) with manual inspection and rectifications. We are curretly completing the files of 2008-2011. The VMDB is an enormous project - any help will be greatly appreciated.

Page generated: 2012 January 18 at 15:16 UTC.

Activity profile

The graph below shows the ZHR (Zenithal Hourly Rate), which is the number of meteors an observer would see under a very dark sky with the radiant of the shower in zenith.
ZHRmax = 198 based on 1475 Geminids reported in 212 intervals, assuming population index r = 2.6

ZHR graph

Time (UTC)Solarlon nINT nGEM ZHR Particle density
2011-12-05 06:05 252.576 3 4 3±1 14 / 109·km3
2011-12-07 19:01 255.152 5 6 3±1 14 / 109·km3
2011-12-10 14:39 258.014 3 5 22±9 101 / 109·km3
2011-12-13 04:59 260.653 4 41 67±10 306 / 109·km3
2011-12-13 22:59 261.416 14 55 72±10 329 / 109·km3
2011-12-14 00:52 261.495 20 90 74±8 338 / 109·km3
2011-12-14 04:30 261.649 18 130 98±9 448 / 109·km3
2011-12-14 12:16 261.978 7 51 129±18 590 / 109·km3
2011-12-14 14:47 262.085 26 222 198±13 905 / 109·km3
2011-12-14 17:08 262.184 34 330 171±9 782 / 109·km3
2011-12-14 20:34 262.330 14 117 160±15 731 / 109·km3
2011-12-14 23:18 262.445 19 202 103±7 471 / 109·km3
2011-12-15 02:42 262.589 14 124 148±13 677 / 109·km3
2011-12-15 17:38 263.222 22 54 24±3 110 / 109·km3
2011-12-17 12:57 265.058 8 41 10±2 46 / 109·km3
2011-12-18 03:40 265.682 1 3 10±5 46 / 109·km3

The reported intervals are automatically added together into the bins shown above, based on the number of meteors and the distribution of the intervals. For each bin, the following parameters are computed:

Observer statistics

Data has been received from 48 observers in 21 countries. Thank you for your efforts!

Spatial distribution of observers

Note: click on the map for an interactive version.

Spatial distribution

Temporal distribution of observers

Temporal distribution

Table of observers

ObserverCountryTeffnGEM
Salvador Aguirre Mexico 2.75h 11
Pierre Bader Germany 1.75h 77
Zsofia Biro Hungary 0.75h 19
Orley Cruz Torres Cuba 0.83h 26
Anderson Dantas Brazil 0.68h 7
Olga Descherevskaya Russia 0.75h 16
Sietse Dijkstra Netherlands 2.69h 56
Elena Evdokimova Russia 1.42h 19
Xiangnan Feng China 1.76h 40
Richard Fleet United Kingdom 0.73h 25
Wei Ge China 5.67h 23
Valentin Grigore Romania 1.23h 28
Javor Kac Slovenia 1.23h 29
Adrián Lelyén Fernández Cuba 0.94h 18
Anna Levin Israel 2.6h 10
Anna Levina Israel 2.41h 13
Zefeng Li China 1.61h 33
Alexandr Maidik Ukraine 0.50h 0
Qiang Ma China 3h 89
Yuxi Mi China 1.02h 2
Sirko Molau Germany 3.85h 128
Artyom Novichonok Russia 2.17h 29
Anuja Parkar India 2.76h 10
Rahul Patil India 3.34h 2
Rahul Patil India 2.40h 2
Mayuresh Prabhune India 2.4h 32
Jurgen Rendtel Germany 7.26h 75
Mileny Roche Lamas Cuba 2.39h 31
Jiangao Ruan China 6.25h 18
Mikiya Sato Japan 1.50h 78
Tomoko Sato Japan 0.50h 32
Kai Schultze Germany 2.47h 31
Costantino Sigismondi Italy 0.75h 1
Wesley Stone United States 1.82h 70
Kazumi Terakubo Japan 1.50h 56
Jakub Koukal Czech Republic 17.16h 265
Students Bsu Russia 1.75h 25
Michel Vandeputte Belgium 5.68h 25
Rafael Ruben Torregrosa Soler Spain 3.68h 67
Shigeo Uchiyama Japan 2.67h 125
Peter Van Leuteren Netherlands 1.00h 23
Tejaswini Varade India 9.46h 28
Kaustubh Vaste India 0.83h 11
Bin Wang China 0.25h 11
Xiaofan Wei China 3h 71
Qi Xin China 1.52h 76
Kai Yu China 3.79h 51
Weizhou Zeng China 4.66h 113
Xiang Zhan China 2.48h 103

Data access

Create your own analysis. The files below can be opened using Excel:
gem2011_rate.csv (number of meteors per interval per observer)
gem2011_magn.csv (number of meteors per magnitude bin per observer)

Credits and references

The information on this page may be distributed freely provided credit is given to the International Meteor Organization (IMO) and, when possible, to the individual observers. The computer facilities to generate this page are provided by ESA/RSSD and Armagh Observatory.

References:

  1. Rendtel J. and Arlt R., editors (2009). Handbook for meteor observations; Chapter 9, Analyses and Calculations. International Meteor Organization. ISBN 978-2-87355-020-2.
  2. Koschack R., Rendtel J. (1990). Determination of spatial number density and mass index from visual meteor observations (II). WGN 18, 119-140.