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R: AO-40: Perigee now ~850 km !!!



Hello Peter,

The AO-40 Amsat Ranging JRM keplerian elements you provided are matching
exactly with time,AZ and EL of AOS at perigee 18:55 UTC orbit 306  on june
29/2001

Tank you very much to you and  to the AO-40 team for the nice job with
ArcJect
motor and for the new safe and stable orbit.

73 de i8CVS Domenico


----- Original Message -----
From: Peter Guelzow <peter.guelzow@arcormail.de>
To: <amsat-bb@AMSAT.Org>; <forum@amsat-dl.org>
Sent: Friday, June 29, 2001 10:50 PM
Subject: [amsat-bb] AO-40: Perigee now ~850 km !!!


> Dear All,
>
> The blowing of cold gas through the Arcjet is over.
>
> Enclosed a first set of keplerian elements generated from ranging data.
> More ranging will be done in the next few days.
>
>
>   AO-40 Amsat Ranging JRM
>   1 26609U 00072B   01176.01392904  .00000000  00000-0  10000-4 0  0047
>   2 26609   5.3129 179.7299 8007917 290.2832   6.8841  1.25610430  3009
>
>
>   Satellite:              AO-40 Amsat Ranging JRM
>   Catalog number:         26609
>   Epoch time:             01176.01392904
>   Inclination:            5.3129  deg
>   RA of node:           179.7299  deg
>   Eccentricity:       0.80079177   -
>   Arg of perigee:       290.2833  deg
>   Mean anomaly:           6.8842  deg
>   Mean motion:        1.25610431  rev/day
>   Decay rate:                0.0  rev/day^2
>   Epoch rev:                 300
>   Semi major axis:    36289.817    km
>
>   Apogee  height         58972.3  km
>   Perigee height           851.1  km
>
>   RAAN dot               -0.1755  deg/d
>   Arg Peri dot            0.3488  deg/d
>
>  ALON = 267°
>  ALAT = -2°
>
> The perigee height raised from 280 km before the outgassing to 851 km
> after, while the apogee height is unchanged.
>
> The good news is indeed, that AO-40 is now in a safe and stable orbit!
>
> The bad news is, that probably all our 53 kg of ammonia is gone.
>
> Since orbit #302 the ammonia stopped flowing and the pressure indicators
> in the telemetry show no more pressure in the motor and in the ammonia
> tanks, while the perigee is much higher than anticipated.
>
> Stored telemetry is currently being downloaded and analyzed, which will
> take some time.  More details later as they become available.
>
> The spacecraft attitude will now be moved back to ALON/ALAT = 0/0 as
> soon as possible and command stations are currently preparing for
> magnetorquing.
>
>
>
> 73s Peter, DB2OS for the AO-40 team
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>


----
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