Archive for category Sun
The next Venus transit will be in December 2117… I took these pictures with my Coronado 90mm H-Alpha telescope in June 2012. You can get more information on this historical Venus 2012 transit on the Nasa web site.
Below is a picture of the first contact on the 5th of June 2012, at 3:07 PM PDT at San Bruno CA. The disk of Venus can be guessed in the mid-section.
A non-processed movie of the entry of Venus can be see below. It shows the first minute of the entry of the disc in front of the Sun.
The next picture was taken at 3:22 PM PDT. The Venus’ disk is clearly visible at this time. There is a large solar filament on the top of the image.
Later at 5:59PM PDT Venus is making its progression on the Solar disc. Solar spots can be seen on the left side of the Venus’ disc.
Location: San Bruno, California
These pictures were taken with the Baader Solar Film and my DMK black and white camera.
Sun granules and faculae are featured in respectively the first and second pictures
The Stellarvue SV90 (3.5″) is a fine instrument for Sun white light Astrophotography.
It reaches temperature equilibrium quite fast – and with its great optical quality it can get as far as a 3.5″ aperture can possibly go…
In addition I used a Televue x5 Powermate. Since the SV90 has a relatively short focal ratio (f/d 7) the x5 powermate is necessary to get high resolution pictures.
– Photoshop CS4
– Astraimage Wavelet filter
With the home made solar filter I made with the baader solar film I took some pictures of the sun, with my Orion StarShoot Solar System Imager II and the Orion 102 premium refractor on the 11/15/208 at 11.15 am PST.
Solar activity is not great these days, making things more challenging … I can remember days where giant sunspot complex where visible with the naked eye.
Shooting the Sun with a Solar filter is not an easy task. Dust speckles on the digital camera show up as you can see here on the below picture – at the right of the sun spot.
It is critical to take flat field pictures and use software like Max DSLR to substract the flat field image from the Sun spot pictures to get higher quality images.
After image processing here is the result. Notice the granulae, sun spot, and faculae around the (small) Sun spot.