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(meteorobs) Fwd: Perseids from Iran - 13/14 Aug 1999




Again, Amir is not a current subscriber of 'meteorobs': if you reply
or follow up, be sure to MANUALLY put 'hasanzad@PHYSICS.sharif.ac.ir'
in the "CC:" line of your response. Clear skies!  -Lew Gramer


------- Forwarded Message

From: hasanzad@PHYSICS.sharif.ac.ir
Date: Sat, 02 Oct 1999 09:58:42 EDT
To: imo-news@imodot net
Cc: hasanzad@PHYSICS.sharif.ac.ir

Subj:	connection,perseids from IRAN(2)

                                    north star group(N.S.G)
                                          Rasht-Iran
Dear friends,
                                             				
thirth perseids meteor stream report:
13,14 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) 
------------------------------------------------------------------------------
19:30-20:00     10              0                10           7   orange-yellow 

20:00-20:30      9              -2               20           3   orange-yellow 

20:30-21:00     10              -1               10           4       yellow
21:00-21:30     14              +0.5             15           3       yellow
21:30-22:00     20              -6               20           7        yellow
22:00-22:30     11              -0.5             20           6    orange-yellow
22:30-23:00     15              -0.5             15           3    white-yellow
23:00-23:30     14               0               15           3         yellow
23:30-00:00     26              -1               15           10   orange-yellow
00:00-00:30     22              -2.5             10           7    orange-yellow
00:30-01:00     23              -2.5             15           6         yellow
-----------------------------------------------------------------------------
length(degree)      1-6           6-11         11-16       16<
------------------------------------------------------------------
number               73           55           11           10  
                                                        total:149
----------------------------------------------------------------------------

            6.9    5.9    4.9    3.9    2.9    1.9   
             |      |      |      |      |      |     
magnitude   6.0    5.0    4.0    3.0    2.0    1.0                         
-----------------------------------------------------------
number      0       3      5       27     46    38     

             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       17     3     6     2      0     1     0     1
-----------------------------------------------------------
             average mag=+1.84

------------------------------------------------------------
color of      yellow  yellow-white  yellow-orange  blue  white red  blue-white
  meteors    
number        61        15            36           0      25    0       2
-----------------------------------------------------------------------------

period       N     LM     ST     C       CP       Haverage      ZHR
 (UT)                                             (degree)
-----------------------------------------------------------------------
19:30-20:00  10   5.7  20h  29m  0       2.4      27.3         102+_32
20:00-20:30  9    5.7  20h  59m  0       1.6      28.2         60+_20   
20:30-21:00  10   5.9  21h  29   0       1.7      32.0         47+_15   
21:00-21:30  14   5.9  21h  59m  0       1.3      35.5         44+_12 
21:30-22:00  20   6.1  22h  29m  0       2.3      39.6         86+_19
22:00-22:30  11   6.1  22h  59m  0       2.0      43.4         38+_11
22:30-23:00  15   6.1  23h  29m  0       1.0      47.2         23+_6
23:00-23:30  14   5.8  23h  59m  0       1.4      51.0         36+_10
23:30-00:00  26   5.8  00h  29   0       2.3      54.6         102+_20
00:00-00:30  22   5.2  00h  59   0       2.4      57.8         150+_32

- ------------------------------------------------------------------------
notes and formula:
N :the number of meteors
Haverage: average altitude of center of radiant
C:cloud
nobs=3
k=1.4
ST:siderial time(begin period)
CP:coefficient of perception
                            6.5-lm
                 ZHR=( N *r  *cp    )/(                k         ) 
                                        nobs*[sin(Hav)]*Teff*(1-c)              
       f observers
                        
                         (6.5-Lm)                           
                cp=(Ns*3.4        )/(Teff*10)         0.4=<cp<=2.5
Ns:the number of sporadic
{ref: Jenniskens P.  astron.astrophys.287}
                                              north star group(NSG)    
                                                   Amir Hassanzadeh
                                          sharif university of technology

------- End of Forwarded Message

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