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(meteorobs) Fwd: Perseids from IRAN
NOTE: Amir is not yet a subscriber of 'meteorobs'. If you wish to respond,
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Lew Gramer <owner-meteorobs@jovian.com>
------- Forwarded Message
From: hasanzad@PHYSICS.sharif.ac.ir
Date: Sat, 25 Sep 1999 09:42:39 EDT
To: imo-news@imodot net
Cc: hasanzad@PHYSICS.sharif.ac.ir
From: PHYSIC::HASANZAD 25-AUG-1999 11:24:02.17
To: MX%"imo-news@imodot net"
CC: HASANZAD
Subj: perseids from IRAN(1)
north star group(N.S.G)
Rasht-Iran
Dear colleagues,
first perseids meteor stream report:
12,13 aug 1999 place:Zyar-Isfahan-Iran lat:32.4N long:52.0E
1)Davod Hammati observer
2)Amir Hasanzadeh observer
3)Mostafa Mosavizadeh observer
4)Soheil Khoshbinfar photographer
5)Ali Jafari writer of notes
first information:
coordinates of center of radiant: DEC:+58 RA:46 (degree)
r=2.6 {ref:1999 meteor shower calender}
period the number of mag. of the most length of the number of most
(UT) meteors luminous longest sporadic color
(+_0.5) (degree)
------------------------------------------------------------------------------
21:00-21:30 22 -5 15 6 yellow
21:30-22:00 33 -2 15 11 yellow
22:00-22:30 22 -1.5 15 9 yellow
22:30-23:00 26 -2 15 7 yellow
23:00-23:30 36 -2 15 6 yellow
23:30-00:00 30 -5.5 15 6 yellow
00:00-00:30 35 -4.5 15 9 yellow
00:30-01:00 23 -2.5 15 6 yellow
-----------------------------------------------------------------------------
length(degree) 1-6 6-11 11-16
-------------------------------------------------------------------------
number 98 108 22 total:228
----------------------------------------------------------------------------
----------------------------------------------------------------------------
| magnitude | 6.9-6.0 5.9-5.0 4.9-4.0 3.9-3.0 2.9-2.0 1.9-1.0
----------- |--------------------------------------------------------------
| number | 0 2 8 44 52 48
0.9 0 -1 -2 -3 -4 -5 -6
| | | | | | | |
magnitude 0.1 -0.9 -1.9 -2.9 -3.9 -4.9 -5.9 -6.9
------------------------------------------------------------
number 15 34 13 5 2 1 2 0
-----------------------------------------------------------
average mag=+1.51
----------------------------------------------------------------------------
color of yellow yellow-white yellow-orange blue white red blue-white
meteors
number 120 24 23 9 36 2 2
-----------------------------------------------------------------------------
period(UT) N LM ST C CP Haverage ZHR
-----------------------------------------------------------------------
21:00-21:30 22 6.0 21h 55m 0 2.2 35.5(degree) 112+_24
21:30-22:00 33 6.0 22h 25m 0 2.4 39.6 160+_28
22:00-22:30 22 5.8 22h 55 0 2.4 43.4 116+_24
22:30-23:00 26 5.8 23h 25m 0 2.4 47.2 126+_24
23:00-23:30 36 5.8 23h 55m 0 2.4 51.0 160+_22
23:30-00:00 30 5.8 00h 25 0 2.4 54.6 124+_22
00:00-00:30 35 5.7 00h 55 0 2.4 57.8 150+_26
00:30-01:00 23 4.8 01 25 0 2.4 60.5 220+_46
------------------------------------------------------------------------
notes and formula:
N the number of meteors
Haverage: average altitude of center of radiant
C:cloud
ST:sidereal time(begin period)
nobs=3
CP:coefficient of perception
6.5-lm
ZHR=( N * r *cp )/( k )
nobs*[sin(Hav)] *Teff*(1-c) num observers k=1.4
(6.5-Lm)
cp = (Ns* 3.4 )/(Teff*10) 0.4 =< cp <= 2.5
Ns:the number of sporadics
{ref: Jenniskens P. astron.astrophys.287}
Amir Hassanzadeh
sharif university of technology
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