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Date: Sat, 07 Feb 1998 02:55:33 -0600
To: SeeSat-L@cds.plasma.mpe-garching.mpg.de
From: Ed Cannon <ecannon@mail.utexas.edu>
Subject: Some Friday night obs, and Iridium rockets
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Observing from Univ. of Texas at Austin campus, 30.2835N, 
97.7379W, and about 150 meters elevation, among the 10 objects 
I saw using one-power (beautiful evening!) were:

TRMM (25063, 97-74A) -- After its culmination, it went through 
Orion, north of the belt.  At that point it was comparable in 
magnitude with Bellatrix, the belt stars, and Saiph (gam, del, 
eps, zet, and kap Orionis), from +1.64 to +2.23.  Higher up, it 
was brighter than those but -- oh, the failing memory! -- I 
think it did not get as bright as Aldebaran (+0.85), so maybe 
it reached about +1.0 to +1.2.

25044 (97-69F; the [Delta 2] rocket of the seventh Iridium 
launch, which maybe is a reason to call it "Iridium L7 Rk" [See 
more below.]) -- It was near perigee on a high pass east of the 
zenith, moving really fast.  At culmination it was only about 
275 km (172 miles) distant, and only about 250 km (156 miles) 
above the ground.  It appeared steady and reached about mag. 
+0.5 to +1.0.  Fun!

UHF F1 Rk (22564, 93-15B) -- flashes between +1 and +2; period 
approx. 18 seconds.

TRMM/ETS7 Rk (25065, 97-74C) -- brighter than +2 at maxima; saw
two maxima before it entered shadow.

-----

Regarding the "common" or "vulgar" names (for use in TLEs, etc.) 
of Iridium launch vehicles -- The upcoming launch, which is 
Boeing Delta Mission 7, is really the *tenth* launch.  I'd like 
to propose the following naming scheme for the Iridium launch 
vehicles:

Launch    Date     Cat #     ID        Name(1)     Vehicle   St.
------  --------   -----   -------   -----------   -------   ---
  01    97-05-05   24797   97-20F    Irid L01 Rk   Delta 2    o
  02    97-06-18    (2)    97-30_    Irid L02 Rk     (2)     (2)
  03    97-07-09   24874   97-34F    Irid L03 Rk   Delta 2    o
  04    97-08-21   24908   97-43F    Irid L04 Rk   Delta 2    d
  05    97-09-14   24951   97-51H    Irid L05 Rk     (3)      d
  06    97-09-27   24970   97-56F    Irid L06 Rk   Delta 2    o
  07    97-11-09   25044   97-69F    Irid L07 Rk   Delta 2    o
  08    97-12-08   25079   97-77C    Irid L08 Rk   CZ 2C      d
  09    97-12-20   25109   97-82F    Irid L09 Rk   Delta 2    o
  10    98-02-__   25___   98-___    Irid L10 Rk   Delta 2    
 etc.

St. = "Status" as of 98-02-07
o   = In orbit
d   = Decayed

(1) "Rk" or "r" (Molczan) or "R/B" (OIG) are interchangeable.
(2) Proton (= SL-12?).  Apparently it was never cataloged.  The 
    seven Iridiums it launched were cataloged in Mike McCants' 
    message "satwk26.rpt from OIG".  I guess it decayed the same 
    day, as did L05 (24951).
(3) "SL-12" (= Proton?).  It decayed the same day.  Do these not 
    have any stage that stays longer in orbit?

Ed Cannon
ecannon@mail.utexas.edu
Austin, Texas, USA



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