[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Sunlight and Eclipse Periods



Hi Folks.

I added a new feature to my PREDICT software this weekend to enable
the program to predict solar illumination percentages for satellites.
Although I have nothing with which to compare my results, they seem
reasonable, and in some cases, are quite interesting.

For example, the RS-12/13 satellite is currently experiencing full
sunlight (no eclipses) 24 hours a day, and will continue to do so
until 26-Mar-2000 when eclipses will begin once again:

               KD2BD's Solar Illumination Calendar For RS-12/13
	  Date     Mins/Day    Sun%          Date      Mins/Day    Sun%
      -----------------------------------------------------------------
      Mon 13Mar00    1440    100.00%	 Fri 31Mar00    1138     79.03%
      Tue 14Mar00    1440    100.00%	 Sat 01Apr00    1118     77.64%
      Wed 15Mar00    1440    100.00%	 Sun 02Apr00    1123     77.99%
      Thu 16Mar00    1440    100.00%	 Mon 03Apr00    1084     75.28%
      Fri 17Mar00    1440    100.00%	 Tue 04Apr00    1069     74.24%
      Sat 18Mar00    1440    100.00%	 Wed 05Apr00    1062     73.75%
      Sun 19Mar00    1440    100.00%	 Thu 06Apr00    1069     74.24%
      Mon 20Mar00    1440    100.00%	 Fri 07Apr00    1035     71.88%
      Tue 21Mar00    1440    100.00%	 Sat 08Apr00    1027     71.32%
      Wed 22Mar00    1440    100.00%	 Sun 09Apr00    1032     71.67%
      Thu 23Mar00    1440    100.00%	 Mon 10Apr00    1027     71.32%
      Fri 24Mar00    1440    100.00%	 Tue 11Apr00    1003     69.65%
      Sat 25Mar00    1440    100.00%	 Wed 12Apr00     998     69.31%
      Sun 26Mar00    1380     95.83%	 Thu 13Apr00    1015     70.49%
      Mon 27Mar00    1282     89.03%	 Fri 14Apr00     998     69.31%
      Tue 28Mar00    1228     85.28%	 Sat 15Apr00     982     68.19%
      Wed 29Mar00    1207     83.82%	 Sun 16Apr00     979     67.99%
      Thu 30Mar00    1165     80.90%	 Mon 17Apr00    1004     69.72%


RS-15 is expected to do the same starting 31-Mar-2000:

                KD2BD's Solar Illumination Calendar For RS-15
	  Date     Mins/Day    Sun%          Date      Mins/Day    Sun%
      -----------------------------------------------------------------
      Mon 13Mar00    1071     74.38%	 Fri 31Mar00    1440    100.00%
      Tue 14Mar00    1063     73.82%	 Sat 01Apr00    1440    100.00%
      Wed 15Mar00    1067     74.10%	 Sun 02Apr00    1440    100.00%
      Thu 16Mar00    1090     75.69%	 Mon 03Apr00    1440    100.00%
      Fri 17Mar00    1099     76.32%	 Tue 04Apr00    1440    100.00%
      Sat 18Mar00    1083     75.21%	 Wed 05Apr00    1440    100.00%
      Sun 19Mar00    1113     77.29%	 Thu 06Apr00    1440    100.00%
      Mon 20Mar00    1130     78.47%	 Fri 07Apr00    1440    100.00%
      Tue 21Mar00    1141     79.24%	 Sat 08Apr00    1440    100.00%
      Wed 22Mar00    1130     78.47%	 Sun 09Apr00    1440    100.00%
      Thu 23Mar00    1174     81.53%	 Mon 10Apr00    1440    100.00%
      Fri 24Mar00    1189     82.57%	 Tue 11Apr00    1440    100.00%
      Sat 25Mar00    1206     83.75%	 Wed 12Apr00    1440    100.00%
      Sun 26Mar00    1218     84.58%	 Thu 13Apr00    1440    100.00%
      Mon 27Mar00    1260     87.50%	 Fri 14Apr00    1440    100.00%
      Tue 28Mar00    1292     89.72%	 Sat 15Apr00    1440    100.00%
      Wed 29Mar00    1330     92.36%	 Sun 16Apr00    1440    100.00%
      Thu 30Mar00    1419     98.54%	 Mon 17Apr00    1398     97.08%


and KO-23 will be baking (and will probably be unusable as a result of
the heat) starting in mid-April (battery problems not withstanding):

               KD2BD's Solar Illumination Calendar For OSCAR-23
	  Date     Mins/Day    Sun%          Date      Mins/Day    Sun%
      -----------------------------------------------------------------
      Sat 01Apr00    1011     70.21%	 Wed 19Apr00    1440    100.00%
      Sun 02Apr00    1016     70.56%	 Thu 20Apr00    1440    100.00%
      Mon 03Apr00    1030     71.53%	 Fri 21Apr00    1440    100.00%
      Tue 04Apr00    1048     72.78%	 Sat 22Apr00    1440    100.00%
      Wed 05Apr00    1050     72.92%	 Sun 23Apr00    1440    100.00%
      Thu 06Apr00    1063     73.82%	 Mon 24Apr00    1440    100.00%
      Fri 07Apr00    1074     74.58%	 Tue 25Apr00    1440    100.00%
      Sat 08Apr00    1097     76.18%	 Wed 26Apr00    1440    100.00%
      Sun 09Apr00    1118     77.64%	 Thu 27Apr00    1440    100.00%
      Mon 10Apr00    1150     79.86%	 Fri 28Apr00    1440    100.00%
      Tue 11Apr00    1200     83.33%	 Sat 29Apr00    1440    100.00%
      Wed 12Apr00    1241     86.18%	 Sun 30Apr00    1440    100.00%
      Thu 13Apr00    1326     92.08%	 Mon 01May00    1440    100.00%
      Fri 14Apr00    1440    100.00%	 Tue 02May00    1440    100.00%
      Sat 15Apr00    1440    100.00%	 Wed 03May00    1440    100.00%
      Sun 16Apr00    1440    100.00%	 Thu 04May00    1440    100.00%
      Mon 17Apr00    1440    100.00%	 Fri 05May00    1440    100.00%
      Tue 18Apr00    1440    100.00%	 Sat 06May00    1379     95.76%

If my calculations are correct, SUNSAT will be living up to its name
and be in continuous sunlight between 12-Jun-2000 and 04-Nov-2000!
Ouch!  :-)

I also discovered that most of the LEO satellites in the OSCAR fleet
on average spend about 67% of each solar day (24 hours) in sunlight.

Pretty neat!  :-)


73, de John, KD2BD

--
-=-=-=-=-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-
Internet  : kd2bd@amsat.org          |  Voice : +1.732.224.2948
Satellite : AO-16, KO-25             |  Morse : -.-  -..  ..---  -...  -..
Packet    : KD2BD @ N2TDU.NJ.USA.NA  |  WWW   : http://www.njin.net/~magliaco/
Video     : 426.250 MHz/439.250 MHz  |  FAX   : +1.732.224.2060
-=-=-=-=-=-=-=-=-=-=-=- Linux Doesn't Cost.  It Pays. -=-=-=-=-=-=-=-=-=-=-=-

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home