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.)



Deze robotten staan op Mars, of komen er binnenkort (Mars Science Laboratory Rover)
Klik op de afbeelding voor meer.
Click here to see a video of Spirits's accomplishments on Mars

Weerkaart voor Zwolle
Astro-weerkaart voor Zwolle (The Netherlands)
Op deze site vind je een Android-app for the Astronomy Weather forecast (astro-weerkaart)

Comet ISON
Comet ISON
Klik op de afbeelding voor mijn speciale site van de komeet ISON

Het MCDOS programma waar ik in de jaren '90 veel van heb genoten
Klik op de afbeelding voor meer.

Hieronder staan afbeeldingen van mijn huidige progranna "ASTROGRAV"

AstroGrav_Gehrels3_1970     AstroGrav_Gehrels3_1973
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

Comet Oterma 1942
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 !!
Oterma 1950   Oterma 1958
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 !

Oterma 1963   Oterma 2011

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 !