Re: Decay space debris ID over S'pore 5/20

cyk (
Sat, 23 May 1998 16:43:50 +0800

Hi Alan and Others that response:

    Thanks for the input:

 Here is my obervations and help me to id this object.
Can you tell me how to check whether there is any space junk/satellite
re-entries that was happening which might correspond to the 'unusually' slow
'meteor' that had broken up into 2 fragements. The luminois trails were
reddish-orange in color and spikes are seen ( like holding a metal against a
turining glinding wheel). Velocity is slower compare to the ' normal ' meteor.
The in 3 projectiles  the outline of the solid-like heads are  clearly seen..
This occured on 5/20/98 Singapore local time 7:34pm. Not sure how to convert to
UTC but we are +8 hrs ahead of GMT.   General direction  is event begin  just
below the 'False Cross' in Constellation of Carina towards Southern Cross -
Cruex  My latitude is 1 degree 27N and 103 Degree 30' E. The event occurs ~20
degree staring SW to S direction in a shallow angle inclination of ~20 degree
down.  The event lasts ~5-8 seconds. No sonic boom was heard and no  train
observed.(did have my bino ready to check).

Alan Pickup wrote:

> YK Chia <> asks
> >    Can anyone out there tell me how to report re-entry phenomena and
> >how to get help to identifywhich object is involved.
> Keep in mind that the vast majority of bright fireballs are meteors and
> not re-entries. Some organisations collect observations of such events;
> for example, here in the UK the British Astronomical Association
> requests that observers submit their reports to Howard Miles, Lane Park,
> Pityme, St Minver, Wadebridge, Cornwall PL27 6PN. There are probably
> other centres worldwide - can other SeeSaters provide addresses?
> If you post your observation(s) here on SeeSat, I (and others, I assume)
> would be happy to help in identifying any potential re-entry. The sort
> of information we'd like is:
>     o  Your location (latitude and longitude and/or name of town etc);
>     o  Date and time of observation (specify the time zone and provide
>          a UTC time if you can make the conversion);
>     o  As much info about location and track in the sky as possible!
>          Altitude (degrees) and direction when first and last seen. How
>          long in seconds was the event visible? If seen at night, are
>          you able to describe the track with respect to the stars and
>          constellations? How did the angular speed compare with meteors
>          and satellites you have seen?
>     o  Appearance, eg single luminous object, or several in train?
>          Colour? Brightness?
>     o  Were any sounds heard? When, relative to the time of the visible
>          object.
> >    What about TLE for decayed satellite on the day of predicted
> >reentry?
> NASA's Orbital Information Group (OIG) publish the latest elsets for all
> unclassified (non-secret) objects. For objects close to decay, I compile
> these into my dklist.tle file which is updated several times daily and
> is available via my WWW page below. However, you can query OIG yourself
> for the final published elsets for recent decayers. Log in and register
> with OIG at
> One of the pages they offer is "Satellite Catalog Action Report". select
> this and under "Data type" check "Header and TLE". This page will
> include the final elsets for recently decayed elsets. Since these may be
> hours before the actual re-entry, you may wish to use my SatEvo program
> to project the elset forwards in time, closer to the re-entry. Be
> warned, though, that a good idea of the actual decay time usually
> requires an analysis based on several elsets over the final day or two.
> Alan
> --
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