Re: Twilight-effect plots for Iridium-Next 56-65 launch from VAFB July 20th

From: Brian Webb via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 12 Jul 2018 12:49:55 -0700 (GMT-07:00)
Hi Ron:

Twilight launches are more impressive when sunlight is shining through the exhaust plume rather than reflecting off of it. 

For observers in Los Angeles and other areas east of the rocket's ground track for this launch, the display should be quite nice visually, but not quite as impressive as the December 2017 dusk launch.

That said, the July 2018 launch occurs during the morning commute and it may cause a commotion.

Regards,

Brian Webb


-----Original Message-----
>From: ronlee--- via Seesat-l <seesat-l_at_satobs.org>
>Sent: Jul 12, 2018 12:28 PM
>To: SeeSat-L <seesat-l_at_satobs.org>
>Subject: Re: Twilight-effect plots for Iridium-Next 56-65 launch from VAFB  July 20th
>
>Rick, this went will be lit from the front as seen from observers
>in the Los Angeles area.
>
>How might that appear differently than the December 2017 event that
>was backlit?
>
>Ron Lee
>
>
>
>
>
>
>> The next Falcon-9 launch from Vandenberg on July 20th will produce a
>> spectacular "twilight-effect" very similar to the Dec 22, 2017 launch.
>>
>> See:
>> https://spaceflightnow.com/2017/12/28/falcon-9-launch-lights-up-southern-cal
>> ifornia-sky/
>
>
>
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Received on Thu Jul 12 2018 - 14:50:29 UTC

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