Results 1 to 3 of 3
  1. #1
    DaveOesper's Avatar
    DaveOesper Guest

    Default High Altitude Triangular Cloud Report



    Around 0130 UT 15 Feb 2004 at latitude 41 48 08 N, longitude 94 37 53 W I
    observed a triangular white cloud about 1 to 2 degrees wide centered over
    Omicron 1 & Omicron 2 Eridani. The sky was completely clear, except for this
    anomalous cloud. I was observing from a very dark location about 10 minutes
    after the end of astronomical twilight, and this cloud had a high enough
    surface brightness that I am certain it was not being significantly illuminated
    by terrestrial light sources.

    The cloud had a diffuse edge, and had no discernable color other than white. I
    was able to observe the cloud for nearly 40 minutes, during which time it
    isotropically expanded and dimmed. The expanding cloud moved very slowly
    relative to the background stars, so that right before it faded to invisibility
    (40 minutes after I first saw it), it was only about 5 - 10 degrees southwest
    of Omicron 1 & Omicron 2 Eridani. There was no detectable fluctuation in
    brightness as is usually seen with isolated auroral clouds, only a slow dimming
    as it expanded.

    I have seen this phenomena twice before: once in the late 1990s (in June at
    Jefferson, Iowa), and once in 1980 At Iowa State University's Erwin W. Fick
    Observatory near Boone, Iowa. The former was a circular cloud, and the latter
    was a cloud about 6 degrees long and about 1 degree wide.

    Does anyone have an explanation for this phenomenon? Have any of you observed
    similar events?

    Thank you,

    David Oesper
    Ames, Iowa

  2. #2
    Stephen Fels's Avatar
    Stephen Fels Guest

    Default High Altitude Triangular Cloud Report

    "DaveOesper" <daveoesper@aol.com> wrote in message
    news:20040214232505.21837.00002029@mb-m14.aol.com...
    this
    minutes
    illuminated
    white. I
    invisibility
    southwest
    dimming
    at
    Fick
    latter
    observed

    It sounds very much like a fuel dump (water dumps by the Shuttle and Space
    station can also have similar appearance). When a satellite is launched, it
    is a good practice to expel the fuel, to prevent a potential explosion.
    Observers often report a triangle, or "trumpet" shaped cloud.
    --
    Stephen
    Home Page: stephmon.com
    Satellite Hunting: sathunt.com



  3. #3
    Ted Molczan's Avatar
    Ted Molczan Guest

    Default High Altitude Triangular Cloud Report

    "DaveOesper" <daveoesper@aol.com> wrote in message
    news:20040214232505.21837.00002029@mb-m14.aol.com...

    observed

    You observed the exhaust from the firing of the 2nd stage of the IUS
    (Inertial Upper Stage) that placed the DSP (Defense Support Program) 22
    satellite into its geostationary orbit.

    DSP 22 was launched on a Titan IV-B booster from Cape Canaveral on 2004 Feb
    14 at 18:50 UTC. The IUS 2nd stage burn was scheduled to occur 6h 32m 56a
    later, on Feb 05 at 01:22:56 UTC. Two other observations have been reported
    via the SeeSat-L mailing list.

    This was the third from final Titan IV-B launch, and the final use of an IUS
    stage.

    Spaceflight Now provided its usual excellent coverage of the launch:

    http://www.spaceflightnow.com/titan/b39/status.html

    Ted Molczan



 

 

Similar Threads

  1. high cloud
    By Gatlin Gunn in forum Amateur Astronomy Forum
    Replies: 1
    Last Post: 07-21-2008, 09:09 PM
  2. High altitude lights
    By John Kirkland in forum UK Astronomy Forum
    Replies: 1
    Last Post: 08-24-2006, 12:32 PM
  3. Fancy using a southern, dark and high altitude observatory?
    By newbinaries@yahoo.co.uk in forum UK Astronomy Forum
    Replies: 0
    Last Post: 10-28-2005, 03:02 PM
  4. Dark skies, high altitude, southern latitude?
    By newbinaries@yahoo.co.uk in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 10-28-2005, 02:36 PM
  5. Mars Altitude
    By Mick in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 08-14-2003, 02:05 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 09:33 PM.