(meteorobs) possible fireball in Portugal

[Andrei Ol'khovatov]

Dear Tony and All,

Thanks, Tony!
The event is getting even more confusing. Hoping that Portuguese researchers
will be able to find out the reality.

Best wishes,
Andrei

----- Original Message -----
From: Tony Beresford <dberesford at adam.com.au>
To: Andrei Ol'khovatov <olkhov at mail.ru>; Global Meteor Observing Forum
<meteorobs at meteorobs.org>
Sent: Saturday, June 05, 2004 12:28 PM
Subject: Re: (meteorobs) possible fireball in Portugal


> At 16:35 5/06/04, you wrote:
> >Dear All,
> >
> >Regarding the unindentified light over Portugal on June 1, 2004, now it
> >looks to me that Sun was already too deep below horizon to illuminate
> >possible airplane's contrail.
> >Unfortunately I don't have software to calculate a height/altitude of the
> >Earth shadow in the area of the event, but my rough estimations show that
> >at 22.15 UTC June 1 Sun was about 22 degrees below local horizon at 38 N,
> >8W.
> >If so indeed the Earth shadow height was ~ 500 km which completely
exclude
> >any
> >possibility of the solar illumination.
> >
> >Does anybody have software/program to calculate the Earth shadow height
or
> >the solar [altitude] angle at least?
> Andrei,
> I can confirm all your calculations above. Firstly just used a planetarium
programme
> (SkyMap Pro) to calculate solar depression angle, at 2215UT at latitude
longitude
> above on June 1 as 22 degrees
> Then an application of the Sine rule for the triangle gives
>  h=  R( (1/sin 68) -1) where R= radius of Earth
> which solves to 500Km
> Tony Beresford
> PS Might not the aircraft detected be just a coincidence
>
>
>
>