Quadrantids 2001: Observations Results!

DMS-members observing the Quadrantids 2001


Carl Johannink : visual observations
Arnold Tukkers : visual observations
Ton Schoenmaker : forward scatter observations
IMO Shower Circular
Quadrantids 2001 (Science@NASA)
Gary Kronk


Last updated: 5 january 2001






Visual results Quadrantids 2001

Carl Johannink, Gronau


Date    : 03/04-01-2001
Observer: Johannink, Carl (IMO-code: JOHCA)
Place   : Gronau (Germany)
Coord.  : 704'E ; 5215'N (!!)
Center  : R.A.=22h00m; Decl.=70 deg. at 17:30 UT
Start   : 17:08 UT
End     : 18:49 UT
Teff    : 1.60 hours


Time(UT)     Qua Com  sp  n  LM  Notes 
-------------------------------------------
17:08-18:04  10   0   4  14  5.2 0.85 hours
18:04-18:49   5   0   5  10  5.4 0.75 hours


   <-2 -2 -1  0  1  2  3  4  5  6   m    n

QUA. 0  0  1  2  2  1  5  4  0  0  2.27 15
COM. 0
Spo. 0  0  0  0  1  0  2  6  0  0  3.44  9 

===========================================

C.F. Johannink
Schiefestrasse 36
48599  Gronau
Germany
Phone: + 49 2562 22345
Email: cjohannink@netside.de




Visual results Quadrantids 2001

Arnold Tukkers, Denekamp


Observer: Results Arnold Tukkers(ATL)
Date    : 3/4 january 2001
Time    : 18:45 UT - 20:45 UT
T.eff   : 2
Place   : Denekamp 5222' - 700'
Number of meteors: 16

PERIODE          Tm    Teff   Lm   QUA SPO DCA Ntot
---------------------------------------------------
18:45 - 19:00   19:00   0.5   4.9   2   2       4
19:15 - 19:45   19:30   0.5   5.0   2   1   2   5
19:45 - 20:15   20:00   0.5   5.0   3   1   1   5
20:15 - 20:45   20:30   0.5   5.0   1   1       2


ZWERM  0   1   2   3   4   5    N    N~   %~   M
---------------------------------------------------
QUA            1   2   5        8    0    0    3,5
SPOR               1   1   3    5    0    0    4,4
DCA            1       2        3    0    0    3,3




Forward Scatter Meteor Observations Quadrantids 2001

Ton Schoenmaker, Roden


Observer:    Ton Schoenmaker
Location:    Roden, Netherlands (0626'E, 5308'N)
Frequency:   55.275 MHz
Transmitter: Spanish TV channel E3 (video); transmitters in La Muela (30 kW),
             Gamoniteiro (50 kW) and Aitana (60 kW); all stations within 
             100 Hz of nominal frequency; distance ~1500 km             
Antenna:     3-elements horizontal Cushcraft 50 MHz Yagi tuned to 55.3 MHz;
             geographical azimuth 210 degrees (SW) 
Receiver:    Yupiteru MVT-9000 in USB mode; sensitivity 0.5 uV at 12 dB S/N
Observing:   800 Hz audio signal from earphone socket was rectified, digitised 
             and fed into a PC via the parallel computer port. HP VEE was used 
             to process the digitised signal and to store 15-minutes counts of
             reflections stronger than 0.22 uV (-120 dBm). Also for all 
             individual meteors date, time, duration (dead time) and maximum 
             signal are stored.

Figure 1 shows the uncorrected (red) and dead time corrected (green) results of forward scatter observations of the Quadrantids. A maximum was observed on 3 January 2001 around 12h UTC. Figure 2 shows the reflection percentages (dead time). Due to pointing of the antenna (about SW), observability for the Quadrantids was low around 8h and 23h30m, and high around 5h and 11h UTC. The (partly) corrected data still have to be corrected for the observability function.

Figure 1. Uncorrected and dead time corrected forward scatter observations of the Quadrantids. The observability function was low around 8h , 20h30m and 23h30m, and high around 5h and 11h UTC.


Figure 2. Uncorrected reflection percentages (dead time) of Quadrantids. The activity of the Quadrantids started around midnight 2/3 January 2001 and lasted until the early hours of 4 January.


Ton Schoenmaker, Dutch Meteor Society and IMO
Meester Homanstraat 8, NL 9301 HP Roden, Netherlands
E-mail: schoenmaker@NFRA.nl
Call: PA0EFA




IMO Shower Circular : Quadrantids 2001

Rainer Arlt & Vladimir Krumov


Favorable lunar conditions accompanied the maximum of the 2001 Quadrantid meteor shower. Peak activity was expected near 12h UT on January 3, corresponding to a solar longitude of lambda=283.16 deg.

Observers were satisfied by good Quadrantid rates in the UT afternoon and evening hours of January 3, 2001. Radio forward- scatter observations as reported by Hiroshi Ogawa, Japan, showed increased Quadratid activity until 20h UT on January 3, compared with the background activity of December 30-January 1. Geometrical effects of radiant direction changes will play a significant role though.

The highest ZHR value is found for 13h30m UT on January 3 or a solar longitude of lambda=283.24 deg (J2000.0). The ZHR of about 130 is a typical value for the Quadrantids, but the number of reports for the peak period is very small whence conclusions are tentative. The peak time may easily shift by one hour to either side once a more comprehensive dataset is available.

We are very grateful to the following 23 observers who sent their reports to the Visual Commission or to the various mailing lists in time for this first activity overview:

ANDBI Birger Andresen (Norway)  MEIMA Marcel Meima (UK)
BIVNI Nicolas Biver(USA)        NICTE Ted A. Nichols II (USA)
BURWI Wlliam Burton (USA)       PUNNI Nilesh Puntambekar (India)
DAVMA Mark Davis (USA)          RENJU Jurgen Rendtel (Germany)
GLIGE George W. Gliba (USA)     SPAGE George Spalding(UK)
GODSH Shelagh Godwin (UK)       STOWE Wes Stone (USA)
HALWA Wayne T. Hally (USA)      TAIRI Richard Taibi (USA)
HASTA Takema Hashimoto (Japan)  TUKAR Arnold Tukkers (the Netherlands)
HOSDA Dave Hostetter (USA)      UCHSH Shigeo Uchiyama (Japan)
JOHCA Carl Johannink (Germany)  YOUKI Kim S. Youmans (USA)
LINMI Mike Linnolt (USA)        ZHUJI Jin Zhu (China)
MCBAL Alastair McBeath (UK)

---------------------------------------------------
Date   Time (UT)  Sollong nObs nIND  nQUA     ZHR
---------------------------------------------------
Jan 02   2300     282.63   2    2     17    13 +- 9
Jan 03   0230     282.78   5    3     40    26 +- 4
Jan 03   0510     282.89  13    5    109    17 +- 3
Jan 03   0740     283.00   9    5     98    56 +- 6
Jan 03   0940     283.08  10    8    192    61 +- 4
Jan 03   1120     283.15   6    4     90    68 +- 7
Jan 03   1330     283.24   3    2     33   131 +-23
Jan 03   1500     283.31   4    3     53   118 +-16
Jan 03   1720     283.41   5    3     76    82 +- 9
Jan 03   1910     283.48  10    5    217    95 +- 6
Jan 03   2110     283.57   5    4     98    79 +- 8
Jan 04   0400     283.86   2    1     19    16 +- 4
---------------------------------------------------

Solar longitudes refer to equinox J2000.0. nObs is the number of individual observing periods, nIND is the number of individ- ual observers providing them, nQUA is the number of Quadrantids seen. The radiant position was assumed at alpha=230, delta=+49, the population index used was r=2.1. The expectation value of the ZHR,

          ZHR = (1 + sum nQUA) / sum(Teff/C),

was used for the averages here, where Teff is the effective observing time and C is the total correction composed of limiting magnitude, clouds, and zenith correction. Times are rounded to the nearest 10 minutes.

Rainer Arlt & Vladimir Krumov,
2001 January 4

--
Visual Commission - International Meteor Organization -- www.imo.net




Quadrantids 2001 (Science@NASA) - - - More info by Gary Kronk




Back to
DMS homepage
back.gif This page was last modified on January 5, 2001 by
Carl Johannink and Casper ter Kuile