Deze pagina op mijn site gaat over ASTRONOMIE/RUIMTEVAART.
(Een van mijn belangrijste hobby's)
(Deze Website is continu in aanbouw.)
Click on picture, then you see a Dramatic Video of the new Mars Rover "Curiosity" in Action. (11 min.)
Astro-weerkaart voor Zwolle (The Netherlands)
Op deze site vind je een Android-app for the Astronomy Weather forecast (astro-weerkaart)
Het MCDOS programma waar ik in de jaren '90 veel van heb genoten
Klik op de afbeelding voor meer.
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Het interstellaire object (rots) "Oumuamua" (1I/2017U1) (klik op de link)
T.z.t. komt hier mijn info over dit wonderbaarlijk object in ons heelal.
(figuur 2 uit nota ESO - Nature over 1I/2017 U1)
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Hieronder staan afbeeldingen van mijn huidige programma "ASTROGRAV"
Sinds (juli 2011) gebruik ik ASTROGRAV
om o.a. Kometen en Asteroiden te onderzoeken.
We zien hier komeet Gehrels 3 in 1970 en 1973 die door
Jupiter een aantal jaren gevangen wordt gehouden.
Comet Gehrels 3 was closely bound to Jupiter, essentially
in orbit, all during the time from 1970 to 1973
39P/Oterma The Case of a lost Comet (1942)
Comets typically are lost, seen for one perihelion passage and never again.
This is to be expected of a parabolic or hyperbolic orbit, but is als true of
many periodic comets.Orbit-changing encounters with planets is another possibility.
Here you see investigate the interesting case of 39P/Oterma.
a comet discovered in 1942, seen for two additional apparitions (1950 and 1958),
but lost since !!
1950 1958
Brian Marsden wrote in the 1986 edition of "Catalogue of Cometary Orbits":
"P/Oterma is lost. It has been subjected to severe pertubations by Jupiter, with the result that the period
is now 19 years, and the perihelion distance more than 5 AU; as of this writing no confirmed observations
have been reported from around the time of its 1983 perihelion passage" !
Well, you can see why with AstroGrav !
A strong perturbation by Jupiter during 1962-1963 kicked it out into a much larger orbit !
After Oterma gets well past Jupiter's perturbing influence and with AstroGrav you will see a new 5.5 AU perhelion,
and a period nearly 19 years, in excellent agreement with Dr. Marsden's estimates.
Checking Object Status in 1916, we find a perihelion of 5.7AU period of 20.7 years.
So this is why it wasn't to be discovered intil 1942 !
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