Astro Page - Usefull Links

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Partial 22°Halo and Sun Dogs

This evening, 2h before sunset, some beautiful Sun Dogs and a partial 22° Halo.

The first sun dog showed up at the west of the sun. Afterwards a partial 22° halo could be seen and a couple of minutes later, a bright sun dog at the east site of the sun was visible. 

  

Weather Summary April

As a summary, April was a cold and dry month.
The month of April was 1°C colder than last year and 2°C colder then 2015. With 10 days of frost it can be compared with April 2015. Compared with 2016, 50% less raindays (7 raindays) and 75% less rain (15,7 mm).

Great Night Observation

Night from April 29-30 : very good weather and seeing conditions. Relative humidity 85% and temperatures around 2°C - 4°C. The moon was only visible untill midnight.

Observations held with Helios collegue Guido Gubbels mainly to discuss and to learn alternative observation techniques.

Following objects observed :

Waxing Crescent Moon 16%

Star Asterims Hat of Napoleon near Arcturus. Drawing was made. As part of this observation I found out more asterisms are available via this web site.

NGC 6229 - Globular Cluster in Herculis - See my observation

Jupiter and Saturnus - See my observation

M3, M5, M9, M10, M12, M13 all globular Clusturs

M23, M27, M51, M57, M63, M65, M66, M81 and M82.

All observations done with Dobson 12" - mostly with 2" 9mm Scientific Explorer. 

Biggest learnings identified :

- polar allignment difference EQ5 vs EQ6 - need to clarify

- use of detailed charts to hop between stars as synscan is not always accurate enough

- use of color filters for planets; great contract using yellow filter for Jupiter

- asterims are something to enjoy and to learn the night sky

Observing Jupiter and Saturnus and use of color filters

In the morning of april 30th observations done of both Saturnus and Jupiter.

Observation were done using 12" Dobson with yellow, orange and grey filter for Jupiter. In all cases the filters did enhance the contrast. Three belts could be observed, aswell some darker spots in the northern belt. Callisto was on the west side of Jupiter, all others (Europa, Io and Ganymedes) on the east side.

I did try out the use of yellow, orange, grey and OIII filter for Saturnus but I can not make any conclusion at this stage. With Jupiter I was certain that the use filters can make a difference. I'm not sure for Saturnus. 

No real structure could be observed on Saturnus. Probably because Saturnus was only 20° above the horizon. Three moons of Saturnus are observed, east of Saturnus : Rhea, Titan and Japetus.

Filters provide during test by Guido Gubbels

NGC 6229 - Herschel 400 (320)

NGC 6229 is a small, bright globular cluster, magnitude 9,4 and located near Herculis 52. The object is listed as object 320 in Herschel's 400 Observing Guide.

Seeing conditions were very good. Relative humidity 85%, temperature 4°C and no moonlight.
Visual observation done with Orion XT12" - 9mm Scientific Explorer. Drawing made by Guido Gubbels.

Chriet Titulaer Overleden

Voor diegene die de jaren '80 nog hebben meegemaakt, kent zeker Chriet Titulaer. Als wetenschapper en sterrenkundige presenteerde hij op Nederlandse TV o.a Wondere Wereld. Een programma over PC's en ruimtevaart en dat mij zeker heeft beïnvloed in datgene wat me vandaag nog altijd boeit.
Chriet Titulaer overleed vandaag op een leeftijd van 73 jaar.