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Re: Further AO-10 Observations On Perigee Passes
- Subject: Re: [amsat-bb] Further AO-10 Observations On Perigee Passes
- From: Tovar <tvr@xxxxxxxxxxxxxxxx>
- Date: 22 Oct 1999 12:08:53 -0700
- In-Reply-To: "Stacey E. Mills, M.D."'s message of "Fri, 22 Oct 1999 10:05:10 -0400"
- User-Agent: Gnus/5.070096 (Pterodactyl Gnus v0.96) Emacs/20.3
AO-10 currently experiences eclipses at perigee of approximately 30 minutes
length. The one tonight should start at 00:37:34 UTC (MA = 255) and end at
01:07:08 UTC (MA = 30). During this time there should be complete loss of
signal. What Jerry is describing above appears to be a different
phenomenon related to slow tumbling of the satellite producing poor
illumination of the solar panels, poor antenna positioning, or both.
However, please note that the perigee eclipses will continue for a long
time (months). They will slowly move towards a later period in the orbit
and a corresponding longer duration into the early part of 2000. For
example, by 2000/03/01, the eclipses will have moved to MA 45-72 and will
be 75 minutes long. AO-10 won't be "eclipse free" again until March 25, 2000.
Attached are predictions for the coming week for portions of passes which
are near-perigee passes (e.g. < 157 dB loss) and not in eclipse. K5OE has
noted a pass that wasn't on either coast, so i've included Texas as well as
both coasts in this set.
This coming week looks particularly favorable for west of the Mississippi
in terms of distance, but on the West Coast, most of the passes are in
the middle of the night. Otherwise, it's mostly a matter of getting up
early enough. I'll try to get up early (6am PDT) tomorrow (Saturday) and
maybe Sunday (5am).
Analogous to EME operation, i hope some of the 'big guns' will be out there
with their excellent receiving equipment to work some of us penny-whistle
stations. I heard England from California on a four element-pair LPVA
the last time i tried this(!), so your presence is especially appreciated.
-- KD6PAG
-------------------------------------------------------------------------------
KD6PAG SatTrack V3.1 Prediction Summary (sunlit LEO passes)
Satellite #14129 : AO-10 (OSCAR 10)
Data File : tlex.dat
Element Set Number: 594 (Orbit 9463)
Element Set Epoch : 02Oct99 15:06:15.703 UTC (20.1 days ago)
Orbit Geometry : 4004.91 km x 35447.61 km at 27.190 deg
Propagation Model : TLE Mean
Ground Station : Berkeley (SSL), CA, USA --- CM87VV
Time Zone : UTC (+0.00 h)
Downlink Frequency: 145.9000 MHz
UTC Azimuth Elev Range Sun Ang Doppler Loss Phs Md V
[deg] [deg] [km] [deg] [kHz] [dB]
Sat 23Oct99 --- Orbit 9507
13:02:43 248.0 52.4 9736.6 40.0 -0.90 155.5 15 B V
13:13:43 231.0 65.9 11213.5 58.3 -1.23 156.7 19 B V
Sun 24Oct99 --- Orbit 9509
12:13:24 245.6 47.8 8463.7 25.4 -0.60 154.3 12 B V
12:35:24 189.3 73.4 11498.3 65.2 -1.40 156.9 20 B V
Mon 25Oct99 --- Orbit 9511
11:26:50 240.0 45.4 7621.2 15.5 -0.36 153.4 10 B V
11:51:35 155.5 72.0 11027.7 64.9 -1.50 156.6 19 B V
Tue 26Oct99 --- Orbit 9513
10:45:46 222.7 55.0 7197.8 19.8 -0.62 152.9 10 B V
11:10:31 126.2 64.7 11210.2 68.1 -1.62 156.7 19 B V
Wed 27Oct99 --- Orbit 9515
10:07:27 181.0 65.0 7321.8 32.4 -1.15 153.0 11 B V
10:26:42 113.7 57.0 10980.5 67.6 -1.71 156.5 18 B V
Thu 28Oct99 --- Orbit 9517
09:26:23 147.5 61.3 7410.8 37.7 -1.41 153.1 11 B V
09:45:38 102.9 46.8 11449.0 70.1 -1.80 156.9 18 B V
Fri 29Oct99 --- Orbit 9519
08:45:20 125.3 52.6 7706.9 42.5 -1.63 153.5 11 B V
09:01:50 97.2 38.7 11405.4 68.8 -1.88 156.9 17 B V
Sat 30Oct99 --- Orbit 9521
08:05:34 108.8 41.1 8473.1 48.8 -1.84 154.3 12 B V
08:16:34 93.9 31.9 11071.0 65.3 -1.94 156.6 16 B V
Satellite #14129 : AO-10 (OSCAR 10)
Data File : tlex.dat
Element Set Number: 594 (Orbit 9463)
Element Set Epoch : 02Oct99 15:06:15.703 UTC (20.2 days ago)
Orbit Geometry : 4004.91 km x 35447.61 km at 27.190 deg
Propagation Model : TLE Mean
Ground Station : Dallas, TX, USA --- EM12OS
Time Zone : UTC (+0.00 h)
Downlink Frequency: 145.9000 MHz
UTC Azimuth Elev Range Sun Ang Doppler Loss Phs Md V
[deg] [deg] [km] [deg] [kHz] [dB]
Fri 22Oct99 --- Orbit 9505
(Actually following day in UTC)
00:10:53 180.0 3.9 11375.0 99.1 +1.41 156.8 245 B D
00:16:23 170.7 3.1 10475.2 89.1 +1.23 156.1 247 B V
Sat 23Oct99 --- Orbit 9507
12:51:06 278.6 5.6 11096.8 9.8 +0.06 156.6 11 B D
13:02:06 275.5 24.0 11424.2 30.2 -0.51 156.9 15 B D
Mon 25Oct99 --- Orbit 9511
11:48:13 260.7 57.4 10876.6 47.9 -1.04 156.5 18 B V
11:50:58 258.5 60.9 11241.5 52.1 -1.11 156.7 19 B V
Tue 26Oct99 --- Orbit 9513
10:58:54 258.1 56.7 9402.1 36.2 -0.90 155.2 15 B V
11:12:39 237.7 75.0 11329.9 59.2 -1.30 156.8 20 B V
Wed 27Oct99 --- Orbit 9515
10:12:20 252.3 58.3 8356.2 27.9 -0.80 154.2 13 B V
10:31:35 177.7 81.4 11222.4 62.7 -1.43 156.7 20 B V
Thu 28Oct99 --- Orbit 9517
09:28:31 240.5 64.4 7678.0 25.6 -0.86 153.4 12 B V
09:50:31 120.8 74.5 11312.4 66.2 -1.56 156.8 20 B V
Fri 29Oct99 --- Orbit 9519
08:44:42 221.8 69.1 7093.6 23.5 -0.92 152.7 11 B V
09:06:42 106.1 65.7 11025.6 66.1 -1.67 156.6 19 B V
Sat 30Oct99 --- Orbit 9521
08:03:38 172.3 73.7 6991.1 29.5 -1.24 152.6 11 B V
08:25:38 96.7 54.1 11441.5 69.1 -1.77 156.9 19 B V
Satellite #14129 : AO-10 (OSCAR 10)
Data File : tlex.dat
Element Set Number: 594 (Orbit 9463)
Element Set Epoch : 02Oct99 15:06:15.703 UTC (20.1 days ago)
Orbit Geometry : 4004.91 km x 35447.61 km at 27.190 deg
Propagation Model : TLE Mean
Ground Station : New York, NY, USA --- FN30AS
Time Zone : UTC (+0.00 h)
Downlink Frequency: 145.9000 MHz
UTC Azimuth Elev Range Sun Ang Doppler Loss Phs Md V
[deg] [deg] [km] [deg] [kHz] [dB]
Mon 25Oct99 --- Orbit 9511
11:29:02 275.8 3.3 11333.3 12.1 +0.01 156.8 11 B D
11:34:32 272.9 12.3 11427.0 20.8 -0.28 156.9 13 B D
Wed 27Oct99 --- Orbit 9515
10:23:24 250.3 46.3 10886.3 41.7 -0.93 156.5 17 B V
10:26:09 247.4 49.6 11217.0 46.1 -1.02 156.7 18 B V
Thu 28Oct99 --- Orbit 9517
09:36:50 245.1 48.1 9771.4 34.2 -0.85 155.5 15 B V
09:47:50 228.2 61.2 11199.7 52.7 -1.21 156.7 19 B V
Fri 29Oct99 --- Orbit 9519
08:47:31 243.5 42.8 8549.0 19.6 -0.52 154.4 12 B V
09:09:31 194.3 68.6 11446.5 59.4 -1.38 156.9 20 B V
Sat 30Oct99 --- Orbit 9521
08:03:42 234.2 46.3 7883.1 16.6 -0.50 153.7 11 B V
08:28:27 159.4 68.0 11448.3 62.5 -1.50 156.9 20 B V
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