Re: Fw: Possible Falcon 9 explosion

From: Jonathan McDowell (planet4589@gmail.com)
Date: Wed Oct 02 2013 - 16:20:33 UTC

  • Next message: Dr. T.S. Kelso: "Re: Falcon 9"

    Leo -  that web site is out of date. My understanding is that the two
    halves of CUSAT are no longer designed to separate.
    
    On 1 October 2013 23:35, Leo Barhorst <l.barhorst@upcmail.nl> wrote:
    >
    >
    > -----Oorspronkelijk bericht-----
    > From: Leo Barhorst
    > Sent: Tuesday, October 01, 2013 11:53 AM
    > To: kd6nrp@earthlink.net
    > Subject: Re: Possible Falcon 9 explosion
    >
    > The 2 CUsats were deployed together from the 2nd stage.
    > Later in the flight the sats will separate and manoeuvring close (within 10
    > m) to eachother using refined GPS.
    > They will also take photo's of eachother to verify the accurancy of the GPS.
    >
    > See the site at Cornell University.
    >
    > Greetings
    > Leo Barhorst
    >
    >
    > -----Oorspronkelijk bericht-----
    > From: kd6nrp@earthlink.net
    > Sent: Tuesday, October 01, 2013 4:13 AM
    > To: Jonathan McDowell ; DAVID DICKINSON
    > Cc: Greg Roberts ; seesat-l@satobs.org
    > Subject: Re: Possible Falcon 9 explosion
    >
    >
    > The Falcon 9 pre-launch manifest that I researched several weeks ago had two
    > CUsat payloads: CUsat 1 and CUsat 2.
    >
    > Did one CUsat not deploy?
    >
    > Regards,
    >
    > Brian Webb
    >
    > -----Original Message-----
    >>From: Jonathan McDowell <planet4589@gmail.com>
    >>Sent: Sep 30, 2013 6:07 PM
    >>To: DAVID DICKINSON <ghedi_dave@yahoo.com>
    >>Cc: Greg Roberts <grr@telkomsa.net>, "seesat-l@satobs.org"
    >><seesat-l@satobs.org>
    >>Subject: Re: Possible Falcon 9 explosion
    >>
    >>The clamshell fairings are suborbital and there is only one CUSAT
    >>object. I have  Falcon 9 St 2, Cassiope, 5 small sats  (DANDE, CUSAT,
    >>POPACS 1-3), 4 POPACS spacers, for total of 11
    >>
    >>
    >>On 30 September 2013 21:01, DAVID DICKINSON <ghedi_dave@yahoo.com> wrote:
    >>> Hi Gang,
    >>>    We count 1x Falcon S2 booster, CASSIOPE, 2x clamshell fairings, 6x
    >>> smaller sats, and 4 spacers in the POPACS payload for a grand total of 14
    >>> objects, 6 short of the 20 being tracked. Did we miss anything?
    >>>
    >>> Thanks,
    >>>
    >>> Dave Dickinson
    >>> Blog: www.astroguyz.com
    >>> Twitter: http://twitter.com/Astroguyz
    >>> Youtube: http://www.youtube.com/astroguyz
    >>>
    >>> ________________________________
    >>> From: Jonathan McDowell <planet4589@gmail.com>
    >>> To: Greg Roberts <grr@telkomsa.net>
    >>> Cc: seesat-l@satobs.org
    >>> Sent: Monday, September 30, 2013 7:03 PM
    >>> Subject: Re: Possible Falcon 9 explosion
    >>>
    >>> Greg - My understanding is that SpX don't think they had an explosion.
    >>> That doesn't mean they didn't get some small pieces
    >>> flying off the vehicle. I agree we'll have to wait for more data and
    >>> see what comes to light.
    >>>
    >>> My rough calculation is that the excess objects may have separated
    >>> around 1640 UTC, while the venting that you saw
    >>> (which I suspect was not a second burn, but a post abort propellant
    >>> dump) was around 1700 UTC I believe?
    >>>
    >>>
    >>>
    >>> On 30 September 2013 18:23, Greg Roberts <grr@telkomsa.net> wrote:
    >>>> Hi Jonathan ( and other readers)
    >>>>
    >>>> Evening - actually my morning now as past local midnight.  Ive just been
    >>>> discussing on the  South African FACEBOOK pages (prior to just having
    >>>> now
    >>>> read the SeeSat items about a possible 2nd stage exolosion) that have
    >>>> covered the event - my page and that of the RSG group - about what
    >>>> appears
    >>>> to be multiple objects in severalof the numerous photographs taken here
    >>>> in
    >>>> South Africa of the event. In view of the comment by Elon Musk that an
    >>>> attempt was made to restart the second stage engine  but the burn was
    >>>> aborted "due to an anomaly"  the question now arises was the "anomaly"
    >>>> an
    >>>> actual explosion of the second stage engine/rocket ?  This might also
    >>>> explain the 20 odd pieces so far confirmed by SPACETRACK.  Having not
    >>>> seen
    >>>> the event myself I have to rely on other peoples images/reports. The
    >>>> satellite/satellites went into earths shadow soon after the "halo" so
    >>>> not
    >>>> enough time to get any seperation. But it was only in shadow for a
    >>>> relatively short time -- did observers north of the equator observe
    >>>> multiple
    >>>> objects close together. From what I understand the six satellites
    >>>> launched
    >>>> are relatively small so not that bright...... of course this is mostly
    >>>> guessing by me so we will have to see what becomes public knowledge - if
    >>>> ever.
    >>>>
    >>>> Cheers
    >>>> Greg
    >>> _______________________________________________
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    >>>
    >>>
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