Cosmos 1 solar sail launch window

From: Ted Molczan (
Date: Tue Jun 21 2005 - 10:44:17 EDT

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    I have learned that the launch window of today's scheduled launch of Cosmos 1 is
    approximately 30 s. Launch is scheduled for 2005 Jun 21 at 19:46:09 UTC.
    In the event of a launch delay, the window opens about 4 min earlier each day.
    Official pre-flight estimated orbital elements are available on this
    Heavens-Above web page:
    Based upon a drawing I found on the Cosmos 1 website, I believe the spacecraft's
    bus is about 1.1 m long, and its average diameter is about 1 m, from which I
    estimate standard magnitude of 8 +/- 2 (1000 km, 90 deg phase angle).
    As announced earlier, I will forward to the Cosmos 1 project all positional
    observations posted to the list, or sent directly to me.
    Ted Molczan
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