Re: Four identical high pressure cylinders found in central Argentina

Ruben,

Here is the formula for the orbit inclination as a function of the azimuth
of the direction of travel (as measured eastward from north) at a given
latitude.

     cos(inclination) = sin(azimuth) * cos(latitude)

     inclination = arccos(sin(azimuth) * cos(latitude))

     inclination = arccos(sin(78.56°) * cos(-32.59°)) = 34.33°, which is
consistent with Rob's inclination.

This is taken from “Space Mission Analysis and Design” by Wertz & Lason,
Third Edition © 1999, page 154, Eq. 6-42b.

Daryl


On Wed, May 14, 2025 at 1:47 PM ruben lianza via Seesat-l <
seesat-l_at_lists.seesatmail.org> wrote:

> Thank you so much Jonathan.
>
> On picture #2 the angle "i" was measured respect to the local parallel
> only.
>
> By considering the latitude, Rob Mac Naught calculated an orbital
> inclination of 34.3°.
>
> I would love to know how that calculation is possible not knowing the sat
> velocity nor having any TLE to propagate.
>
> So here us my qyestion:
> Is there any simplified formula for that, which includes latitud and local
> parallel angle on the first member and orbital inclination on the second
> member ( perhaps, assuming a perfectly circular orbit therefore a constant
> orbital velocity) ?
>
> Any comments / suggestions will be infinitelly appreciated.
>
> All the best.
>
> Ruben
>
> El mié, 14 de may de 2025, 15:10, Jonathan McDowell <planet4589_at_gmail.com>
> escribió:
>
> > I have placed Ruben's images at
> > https://planet4589.org/space/misc/arg1.jpg
> > https://planet4589.org/space/misc/arg2.jpg
> >
> > On Wed, 14 May 2025 at 14:01, ruben lianza via Seesat-l <
> > seesat-l_at_lists.seesatmail.org> wrote:
> >
> >> Michael:
> >>
> >> Just as expected, the attachment didn't come through.
> >> Our emails have a 300 KB limit.
> >>
> >> Here is the rejection message:
> >> Your message is being held until the list moderator can review it for
> >> approval.
> >> The reason it is being held:
> >> Message body is too big: 486834 bytes with a limit of 300 KB
> >>
> >> Sorry for the inconvenience
> >>
> >> I wish there were email addresses where one could send pics at least to
> a
> >> few really interested members.
> >>
> >> All the best
> >>
> >> Ruben
> >>
> >> El mié, 14 may 2025 a las 13:36, ruben lianza (<rubenlianza_at_gmail.com>)
> >> escribió:
> >>
> >> > Hi Michael:
> >> >
> >> > I am attaching a map which contains pics on all four cylinders .
> >> Although
> >> > I am not sure if it will get through.
> >> > Keep your fingers crossed.
> >> >
> >> > El mié, 14 may 2025 a las 12:30, Michael Clive (<zeinin_at_gmail.com>)
> >> > escribió:
> >> >
> >> >> Can you share photos? I can make some assessments of materials and
> >> >> methods of construction. Were they spherical or capsule tanks?
> >> >>
> >> >> On Wed, May 14, 2025 at 8:15 AM ruben lianza via Seesat-l <
> >> >> seesat-l_at_lists.seesatmail.org> wrote:
> >> >>
> >> >>> Thanks for your quick and valuable reply Rob.
> >> >>>
> >> >>> I have narrowed down to about five candidates reentering around
> those
> >> >>> dates.
> >> >>>
> >> >>> Cheers.
> >> >>>
> >> >>> Ruben
> >> >>>
> >> >>> El mié, 14 may 2025 a las 2:43, <robmcnaught_at_westnet.com.au>
> >> escribió:
> >> >>>
> >> >>> > Hi all,
> >> >>> > The direction of motion of a satellite relative to a geographic
> >> >>> parallel
> >> >>> > is dependent on the latitude of the location. For example, for an
> >> >>> orbital
> >> >>> > inclination of 12.0deg, a satellite cannot pass overhead at a
> >> >>> geocentric
> >> >>> > latitude greater than 12.0deg N or 12.0degS and would be moving
> due
> >> >>> east
> >> >>> > (Az=90deg) at the north and south apex. It would only have an
> angle
> >> of
> >> >>> + or
> >> >>> > - 12.0 deg when crossing the equator.
> >> >>> >
> >> >>> > The geographical/geodetic latitude of Armstrong/Bustinza is
> ~32.76S
> >> >>> which
> >> >>> > represents a geocentric latitude of 32.59S. For an azimuth of
> >> 78.56deg
> >> >>> at
> >> >>> > this geocentric latitude, the implied orbital inclination is
> >> 34.3deg.
> >> >>> Hope
> >> >>> > this helps in narrowing down the candidates.
> >> >>> >
> >> >>> > Cheers, Rob
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>> > On Wed May 14 2025 ruben lianza via Seesat-l <
> >> >>> > seesat-l_at_lists.seesatmail.org> wrote:
> >> >>> > ---------- Original Message ----------
> >> >>> >
> >> >>> > Dear Ted, Marco and Sat Obs members:
> >> >>> > I have been working all last weekend in the recovery and
> >> investigation
> >> >>> of
> >> >>> > provenance of three high pressure cylinders that have fallen near
> >> the
> >> >>> > cities of Armstrong and Bustinza, Province of Santa Fe, Argentina.
> >> >>> >
> >> >>> > Their crash sites are remarkably aligned in a straight line,
> within
> >> a
> >> >>> 12
> >> >>> > miles long x 90 yards wide corridor, heading 78.56 °.  The angle
> of
> >> the
> >> >>> > corridor respect to the nearest parallel is about 12° which I
> >> assume is
> >> >>> > coincident with its orbital inclination.
> >> >>> >
> >> >>> >
> >> >>> >
> >> >>>
> >> >>> _______________________________________________
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> >> >>> https://lists.seesatmail.org/mailman/listinfo/seesat-l
> >> >>>
> >> >>
> >>
> >> _______________________________________________
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> >>
> >
>
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