(meteorobs) repost of 1999 message on SDA

[Norman W. McLeod III]

 From Bert yesterday :
  >said in the past I am strongly of the opinion the Delta Aquarid max 
is  LATER
 >than the stated dates, common in many publications and books.

I certainly agree with Bert.  Now I see a post that the max has become even 
earlier, July 27.  When I first got into meteors I learned the date of July 
29.  But observing in dark skies starting in the early 70's showed the max 
date to be solidly July 30.  Ongoing bad weather for well over 20 years 
ended my Delta Aquarid observing in 1984.  Could the max date be shifting 
to earlier nights since then?  I would not know why.

Here is a message I sent to meteorobs in 1999:

1:52 PM 7/27/1999        3      Re: NM past South Delta Aquarid rates


Here are abbreviated reports from several past Julys, restricted to hourly 
South Delta Aquarid rates and seen in mostly LM7.0 skies from latitudes 25N 
to 28N.  Times are in local daylight hours.

1971
July 26/27, hours 1-5 ; South Deltas 3,4,6,6
July 29/30, hours 2-5 ; South Deltas 10,14,9

1973
July 25/26, hours 11-3 ; 7,3,4,2,3
July 26/27, hours 11-12 ; 1
July 27/28, hours 3-5 ; 4,6
July 28/29, hours 1-5 ; 5,3,5,3
July 29/30, hours 12-5 ; 5,7,4,6,12
July 30/31, hours 1-5 ; 10,6,7,5
July 31/1, hours 12-5 ; 7,5,12,10,7
Aug 1/2, hours 12-5 ; 2,7,6,5,1
Aug 2/3, hours 1-3 ; 8,7
Aug 3/4, hours 1-3 ; 5,18

1974
July 25/26, hours 12-2 ; 1,2
July 25/26, hours 4-5 ; 1
July 26/27, hours 2-5 ; 6,3,4
July 27/28, hours 1-5 ; 5,8,6,14
July 28/29, hours 2-4 ; 4,13

1976
July 25/26, hours 11-5 ; 1,2,4,6,6,9
July 26/27, hours 10-11 ; 0
July 26/27, hours 2-5 ; 8,11,7
July 27/28, hours 10-5 ; 0,2,2,6,11,16,10
July 28/29, hours 10-5 ; 0,0,10,12,11,10,9
July 29/30, hours 10-5 ; 1,3,6,18,24,16,9
July 30/31, hours 10-3 ; 1,2,15,15,9
July 31/1, hours 9-5 ; 1,0,3,5,11,9,13,7

1981
July 27/28, hours 11-12 ; 3
July 27/28, hours 1-4 ; 6,6,4
July 28/29, hours 11-4 ; 0,6,10,6,11
July 29/30, hours 10-5 ; 3,7,6,9,22,16,16
July 30/31, hours 12-5 ; 4,5,10,10,3
July 31/1, hours 10-2 ; 2,1,0,8
Aug 2/3, hours 2-5 ; 5,6,4

1984
July 25/26, hours 1-4 ; 7,4,6
July 27/28, hours 2-3 ; 3
July 28/29, hours 12-5 ; 3,9,7,6,3
July 29/30, hours 3-4 ; 16

On which night does maximum occur?

Norman



Norman W. McLeod III
Staff Advisor
American Meteor Society

Fort Myers, Florida
nmcleod at peganet.com