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I recently purchased a new celestron telescope and set it up last night to use for the first time. I live in UK, around 8/9pm-ish I took my telescope outside to view Venus in the western sky as it was v bright, perfect opportunity.
After finding Venus and increasing the focus I realised that there was something like a large black circle in the centre of the bright blue/white ring of light. Before focussing, it appeared to be just v bright light.
I am wondering if anyone can explain to me why this black circle appeared on / in front of Venus. I thought it looked like a moon, which is obviously incorrect but it looked that way. Is it possibly sulphuric clouds of Venus absorbing light?
Any information/help is much appreciated
happy observing, all!
GRS Transit on Jupiter, crossing the meridian at 4.18am with Jupiter at just over 21 degrees altitude. GRS starts to come onto the disk at around 2.10am, disappearing at around 6.15am.
A couple more events too, an Io Shadow Transit starting at 4.22am and an occultation or Ganymede at 4.29am. Full timings in the attachment. Best time to view is probably 5.18am with both shadow and GRS well positioned.
As per Chris's post, GRS and a shadow transit of Io are visible tomorrow morning, weather permitting of course!
Io Shadow Transit starts at 2:28am, finishing at 4:39am
GRS Transits at 3:32am, and Jupiter itself transits the meridian at 4:53am
Between 3:30 and 4am could be an optimum time, Jupiter at around 19 degrees and above, not far off its highest at 21 degrees.
I seem to have an issue with my NS camera that I can't figure out. Whenever I take a picture, every bright object in it, especially stars, have a black shadow on the right part of the image. I have disregarded the effect coming from the telescope or reflections from outside, because the shadow always appears on the right, regardless the angle of the camera with respect to the telescope. The effect is very apparent when I'm focusing. I have attached several pictures to see if someone can give me a hint:
- ...004: focusing street lights
- ...006 Calibration (Dark)
- ...008 Calibration (Bias)
- ...010 Calibration (Flat): pointing to a street light and trees
- ...013 Focusing a star
- ...019 Picture of street lights
- ...003 Focusing a bright star
- ...5420 Picture of a star field