Re: ISS 5 consecutive passes

From: Larry Wood (chukwood@telusplanet.net)
Date: Sun Aug 11 2002 - 03:48:33 EDT

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    I believe 5 passes can be observed in 6 hours  30 minutes .... unless you have
    some other definition of a pass... than seeing a satellite pass overhead.
    
    I have seen 4 consecutive ISS passes ( last year). One of my friends here in
    Edmonton Alberta saw 5 consecutive passes in June of this year.
    
    This summer we had two occasions to see 5 passes. Times for both passes are
    listed below. The ISS is bright enough to be seen when the Sun is more only  3°
    below the horizon. I have seen it more than once with the Sun very little more
    than the minimum negative elevation.
    
    Solar Elevation at 22:23  July 25  =  -5.5°
    
    Solar elevation at 04:51 July 26  =   -6.3°
    
    If I place my location as 387 km above the Earth at Lat 51.6374° at solar
    midnight at 01:34  July 26 the Sun is still 52 arc-minutes above the horizon.
    Sure makes for a fainter and red tinted  ISS.
    
    Larry Wood
    W 113.565   N 53.558
    
    ==================================
    Element File:        Latest.tle
    Tracking Station:     Edmonton,AB
    Visibility Mode:     Optical
    Satellite:           ISS
    
    Local
    Date      Time          Elev  Azim   Range Lat    Long   Alt  Dopp  Dopp  Phz
    Sqt V
    MM/DD/YY HH:MM:SS  Deg   Deg    Km    Deg    Deg    Km   Up    Down  256 Ang
    
    
                                 -- Rev # 21011 --
    07/25/02 22:23:00   6.1 176.1  1675  39.3 -112.3   387  -1487  -4492  10  -1 Y
    07/25/02 22:24:00   8.9 161.8  1476  41.5 -108.3   387  -1680  -5074  12  -1 Y
    07/25/02 22:25:00  10.3 144.2  1385  43.7 -104.1   388  -1866  -5635  15  -1 Y
    07/25/02 22:26:00   9.7 125.9  1424  45.6  -99.6   389  -2044  -6173  18  -1 Y
    07/25/02 22:27:00   7.4 110.0  1583  47.3  -94.8   389  -2214  -6685  21  -1 Y
    
                                     -- Rev # 21012 --
    07/25/02 23:57:00   5.8 230.3  1706  43.1 -128.8   388   -448  -1353  14  -1 Y
    07/25/02 23:58:00  11.5 224.3  1319  45.1 -124.4   389   -617  -1864  17  -1 Y
    07/25/02 23:59:00  19.7 213.0   968  46.8 -119.6   389   -784  -2368  20  -1 Y
    07/25/02 00:00:00  30.7 188.0   708  48.4 -114.6   390   -948  -2862  22  -1 Y
    07/26/02 00:01:00  33.7 143.5   662  49.7 -109.2   390  -1108  -3345  25  -1 Y
    07/26/02 00:02:00  23.5 110.9   863  50.7 -103.6   391  -1263  -3815  28  -1 Y
    07/26/02 00:03:00  14.1  96.2  1192  51.4  -97.7   391  -1414  -4269  31  -1 Y
    07/26/02 00:04:00   7.7  88.8  1570  51.7  -91.8   391  -1558  -4706  34  -1 Y
                                     -- Rev # 21013 --
    07/26/02 01:33:00   7.2 260.5  1598  49.3 -134.2   390    433   1309  24  -1 Y
    07/26/02 01:34:00  14.1 257.9  1192  50.4 -128.7   390    292    880  27  -1 Y
    07/26/02 01:35:00  25.8 251.9   808  51.2 -122.9   391    148    447  30  -1 Y
    07/26/02 01:36:00  49.4 230.0   504  51.7 -116.9   391      4     11  33  -1 Y
    07/26/02 01:37:00  54.4 135.8   474  51.8 -110.9   392   -142   -427  35  -1 Y
    07/26/02 01:38:00  28.5 106.4   752  51.6 -104.9   392   -287   -866  38  -1 Y
    07/26/02 01:39:00  15.6  99.5  1129  51.1  -98.9   392   -431  -1303  41  -1 Y
    07/26/02 01:40:00   8.2  96.5  1533  50.2  -93.2   392   -575  -1737  44  -1 Y
                                     -- Rev # 21014 --
    07/26/02 03:09:00   7.0 272.0  1621  51.8 -136.0   392   1364   4119  34  -1 Y
    07/26/02 03:10:00  13.4 266.4  1230  51.7 -130.0   392   1233   3724  37  -1 Y
    07/26/02 03:11:00  23.1 254.9   875  51.2 -124.0   392   1096   3311  40  -1 Y
    07/26/02 03:12:00  36.9 225.9   622  50.5 -118.2   392    954   2882  43  -1 Y
    07/26/02 03:13:00  37.5 172.5   615  49.4 -112.7   392    807   2438  45  -1 Y
    07/26/02 03:14:00  23.7 142.1   860  48.1 -107.4   392    656   1980  48  -1 Y
    07/26/02 03:15:00  13.8 130.2  1213  46.5 -102.4   392    500   1510  51  -1 Y
    07/26/02 03:16:00   7.3 124.4  1602  44.6  -97.7   392    341   1030  54  -1 Y
                                     -- Rev # 21015 --
    07/26/02 04:46:00   8.4 254.5  1520  48.5 -132.3   392   1994   6021  47  -1 Y
    07/26/02 04:47:00  11.8 238.6  1314  46.9 -127.2   392   1849   5584  50  -1 Y
    07/26/02 04:48:00  13.4 218.5  1229  45.2 -122.5   392   1696   5121  53  -1 Y
    07/26/02 04:49:00  12.2 198.0  1290  43.2 -118.0   392   1534   4633  56  -1 Y
    07/26/02 04:50:00   9.0 181.4  1478  41.0 -113.9   392   1365   4121  58  -1 Y
    07/26/02 04:51:00   5.3 169.5  1753  38.7 -110.0   392   1188   3587  61  -1 Y
    
    
    The earlier date of 5 passes was as follows:
    
                                     -- Rev # 20074 --
    05/26/02 22:31:29   7.5 176.1  1575  40.2 -112.3   389  -1481  -4473 205  -1 Y
    05/26/02 22:33:00  11.3 151.4  1337  43.4 -106.2   390  -1763  -5325 209  -1 Y
    05/26/02 22:34:29  10.4 122.7  1386  46.3  -99.3   390  -2029  -6127 213  -1 Y
    05/26/02 22:36:00   5.9 100.9  1698  48.6  -91.8   390  -2275  -6872 217  -1 Y
                                     -- Rev # 20075 --
    05/27/02 00:06:00   9.8 229.2  1421  44.9 -126.3   390   -512  -1546 211  -1 Y
    05/27/02 00:07:29  22.5 212.9   886  47.5 -119.1   390   -759  -2293 215  -1 Y
    05/27/02 00:09:00  37.0 158.8   617  49.6 -111.2   390  -1000  -3020 219  -1 Y
    05/27/02 00:10:29  22.0 106.2   901  51.0 -102.7   390  -1232  -3721 223  -1 Y
    05/27/02 00:12:00   9.6  90.5  1440  51.7  -93.8   390  -1453  -4388 228  -1 Y
                                     -- Rev # 20076 --
    05/27/02 01:42:00  11.9 260.2  1305  50.4 -130.4   390    392   1185 221  -1 Y
    05/27/02 01:43:29  29.5 251.0   730  51.5 -121.7   390    179    540 225  -1 Y
    05/27/02 01:45:00  61.4 162.7   440  51.8 -112.6   390    -38   -114 229  -1 Y
    05/27/02 01:46:29  24.8 105.4   829  51.4 -103.6   390   -255   -771 234  -1 Y
    05/27/02 01:48:00   9.9  98.4  1417  50.2  -94.9   389   -473  -1427 238  -1 Y
                                     -- Rev # 20077 --
    05/27/02 03:18:00  11.4 267.9  1329  51.7 -131.5   390   1321   3989 231  -1 Y
    05/27/02 03:19:29  25.6 248.8   809  50.9 -122.7   389   1116   3369 235  -1 Y
    05/27/02 03:21:00  37.3 186.4   612  49.4 -114.2   389    897   2710 240  -1 Y
    05/27/02 03:22:29  19.8 141.0   964  47.3 -106.4   388    668   2018 244  -1 Y
    05/27/02 03:24:00   8.2 127.9  1521  44.6  -99.2   388    430   1299 248  -1 Y
                                     -- Rev # 20078 --
    05/27/02 04:54:00   7.1 256.2  1606  48.4 -133.6   389   2060   6222 241  -1 Y
    05/27/02 04:55:29  11.4 232.5  1325  46.0 -126.1   388   1841   5561 246  -1 Y
    05/27/02 04:57:00  11.3 202.9  1327  43.1 -119.4   387   1602   4839 250  -1 Y
    05/27/02 04:58:29   6.9 179.3  1612  39.8 -113.3   387   1345   4062 254  -1 Y
    
    
    Larry Wood
    W 113.565   N 53.558
    
    
    ----- Original Message -----
    From: "Dale Ireland" <direland@drdale.com>
    To: "Seesat-l" <SeeSat-L@satobs.org>; "Edward Ehrlich" <eehrlich@shani.net>
    Sent: Friday, August 09, 2002 2:21 PM
    Subject: RE: ISS 5 consecutive passes
    
    
    >
    > I've seen 4, I think the record and theoretical max is 6.
    > 52 N is too far north because the alignment has to occur in local
    > spring-summer and at 52 north the period of darkness is too short. The
    > optimum latitude is 35-40, longer night, still adequate elevation at
    > farthest north pass.
    > Dale
    >
    >
    > > -----Original Message-----
    > > From: Edward Ehrlich [mailto:eehrlich@shani.net]
    > > Sent: Friday, August 09, 2002 12:49 AM
    >
    > > sunlight.
    > > >Jay lives near New York. But also from my location at 52 degrees north
    > > it >is possible to see ISS (and other sats)on more than 2 consectutive
    > > passes.
    > >
    > > Thank you for the explanation.  I'm a little surprised because I just
    > > don't remember a case in the many (hundreds of thousands) low flying
    > > satellite predictions that I've made, ever seeing more than two
    > > consecutive passes.
    > >
    > > If anybody has the time and location from which they have seen 3 or more
    > > consecutive passes, I would very much appreciate the information.  I
    > > would like to check if my software is handling that situation correctly.
    > >
    >
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    >
    
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