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Found 55 results

  1. Just bagged 10 minutes between the clouds and got to see the Mercury shadow transit! Its so long since I used the Lunt that I took a few seconds to get back into the groove of tuning the double stack and letting some air into the tuner as it was flat. Not much else on the disc - 3 x sets of proms, 3 tiny filaments, saw one small bright flux patch briefly. But the Mercury shadow was nice and clear and a decent sized patch too. Just got back inside before it started spotting with rain! Fingers crossed for another clear patch later ... Alan
  2. We are hoping to observe the transit in school (Don’t panic - we have done several transits and partial eclipses in the past so we are fine on the safety aspects - thanks). However does anyone know how I can get hold of some links to use in advance of the day that we can use to put some professional feeds up on the large screen tellies we have linked up to the computer systems these days – I am told that links on YouTube are the easiest to handle on the slightly clunky system we have to control them. My question comes from reminiscing with colleges that my daughter and I had stayed up to watch first contact of the last transit of Venus live from Hawaii before swapping to Mt Wilson. (We were also up before dawn on top of the local hill fort as the sun rose having lugged an old 4” reflector up there.) Of course at the time we were just browsing through the internet not taking good note of sites we were on.
  3. We are running a session at my local society on transits and occultations. One station will focus on exoplanet transits, and we'd like to build a very simple model to demonstrate this. We have a star (light source) and an orbiting "planet" but I need to work out how to detect the changes in light intensity and display this on a laptop, like a classical transit photometry trace below (taken from https://heasarc.gsfc.nasa.gov/docs/tess/primary-science.html). Is there a way to take a feed from a DSLR through the USB output to do this, else I could get an adapter for my ZWO and put an EOS lens on the front of that. I really do want a light intensity vs time trace in real time on the laptop. This model will be run in a darkened room. Thanks for any comments. James
  4. Got some images of the Europa transit, with C8, ASI120MC, ADC. Processed in Registax6. Also two other moons. I don't see colour in this image at all, either to the eye or in the histograms. It was recorded as a RAW16 .ser file, which I thought would be colour (and Registax gives it a tick for colour). I wondered if I had goofed somewhere. So tried turning up the colour saturation (2nd image).
  5. until
    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.
  6. Stu

    Jupiter GRS Transit

    GRS Transit on Jupiter, crossing the central meridian at 2.40am with Jupiter at just over 16 degrees altitude. GRS starts to come onto the disk at around 12.30am as Jupiter rise, disappearing at around 4.30am.
  7. Stu

    Jupiter GRS Transit

    GRS Transit on Jupiter, crossing the meridian at 6.48am with Jupiter at just over 15 degrees altitude. GRS starts to come onto the disk at around 4.40am, disappearing at around 8.50am.
  8. Stu

    Jupiter GRS Transit

    GRS Transit on Jupiter, crossing the meridian at 5.10am with Jupiter at 21 degrees altitude. GRS starts to come onto the disk at around 3am, disappearing at around 7.15am.
  9. until
    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.
  10. As per the heads up, GRS was transiting at 6.02am this morning, so with the promise of clear skies the alarm was set. I was too lazy to setup the AZGTi further down the garden, which would have been better, so I was stuck closer to the house and trees with the scope on the Giro-WR. Lovely views right from the start really, GRS heading for the meridian showing some nice colour although not as dramatic as I've seen it in the past. I could see the white separation between GRS and SEB, north and south polar regions and what I assume was the South Temperate belt and Zone. Hints of a festoon dropping into the Equatorial Band. This was another occasion when I tried cyclops first, then switched to the binoviewers to see if I preferred it. Binoviewing, on this occasion, definitely made the detail easier to access although that has not always been the case for me. I was at x230 ish and floaters were well controlled. I thought the seeing dropped off after a while, until I defocussed and realized I was observing through the twigs of one of our trees! Amazing that I could still see some detail even then. Loppers required before the next outing I think, plus putting the other pillar extension on! What a lovely way to start the day. Blackbird singing his heart out and the gulls floating gently overhead on their way to the reservoirs. The Parakeets had yet to start their noisy morning commute! Two last surprises. I thought Saturn might be visible, and did catch it just before it was occulted by......my house! OK views but good just to see it again. Finally, despite it being quite light at gone 6am, Arcturus was clear and I could also still see Izar so I popped the scope onto it. What a beautiful sight! Very well controlled faint diffraction ring around Izar and its secondary was as clear as I've seen it, lovely separation and nice almost greenish blue colour to my eye. It has always been bluish grey to me, so perhaps just a trick of the daylight. Great way to finish off, then back in for a warming cuppa and a little three year old who wanted a cuddle .
  11. Stu

    Jupiter GRS Transit

    The GRS transits the meridian at 6.02am Jupiter will be 20 degrees above the horizon at this point, with sunrise still nearly an hour away at 6.54am. Timings and altitude from London.
  12. Taken at 0218 am on 14th July 2017. ISS transit of the Moon. The ISS had just come out of shadow, was low in the sky: ISS Lunar Transit by James West, on Flickr
  13. Seeing was mostly poor, but I am quite happy with how it came out
  14. Here is my video of the double shadow transits of Io and Europa in color with a little processing. More musical atmosphere with "La Langue des Sentiments". Is it easier to see the shadows in this color image? Kaleidoscopic skies! Reggie
  15. Double transits of Io and Europa across Jupiter, shot just after midnight with the Orion Deep Space Video Camera II through the Orion 127mm Mak. Io's shadow is more prominent on the left, on the upper belt. Europa's shadow is smaller and is located on the extreme upper right of Jupiter (above the belt); it peeks in and out because of the less-than-optimal seeing. Also, enjoy some original space music by my band, THE FALSE DAWN, La Langue des Sentiments (The Language of Feeling). Clear skies! Reggie
  16. 17 frame animation. Seeing improved during the session. Europa itself becomes easier to see. The shadow is easily visible.Skymax 180 7″ Maksutov-Cass at f30 (x2 barlow)Imaging Source DBK 21AU618.as 17x90s AVI 60fpsCaptured with FireCapture, Stacking in AutoStakkert Wavelets in Registax, processing and rendering in Photoshop CC2017-05-04 21:22 UT – 22:11 UT, Seeing: III-IV
  17. Amazing coincidental transits of the Great Red Spot AND Ganymede on Jupiter shot using my Orion Deep Space Video Camera II and my Orion SkyView Pro 180mm Mak around midnight last night (April 22). Ganymede can be seen casting a shadow along the northern limb. The GRS can be seen roughly near the center of the planet. "Intrapsychic Conflict" is introduced as the musical landscape, not unconscious turmoil, lol! Enjoy! Reggie
  18. Hi, since quite some time I wanted to image a ISS moon transit. After my successfull double ISS solar transit I tought that could be another nice "thing to have". After all the fuzz about the super moon I decided "I need no sleep!". Since my Mak127 with my Nikon5100 is barely able to frame a "normal" moon, and not able to get a full moon on video, I used a Vivitar Series 1 Zoom adapted to my ZWO ASI 120MC on my NexStar SLT. That left me with quite some low resolution but I tried anyways. The night was very clear, there was just one thing which worried me. The big walnut tree could be in the way... I tried to measure and plann with stellarium and came to the conclusion that it would work from my terrace, sitting in the warm house imaging. First I wanted to image from a window in the first floor but that would have meant very bad air or let the room cool out heavyly. I took some nice shots around midnight and again slewed the scope to the expected position, just above the walnut tree. So I sleeped a bit and started to align the scope again at 4:00 MEZ, the transit was expected at 4:25:40. The moon was high enough still and I was quite sure it would work out. At 4:20 there was suddenly some strange shadows, then a trunk started to "move in", dang not enough time to pack the telescope and move to the garden. I hoped that I could make it to a gap in the tree in 5 minutes, but no.... So I ended up with a successfull imaged transit but having some shadows. I get now the chainsaw... ;-) Spot the ISS close to the center. The incredible 58fps of the ASI produces nearky a continous line of ISS outlines: So now I am tired but the outcome was despite my error quite ok. Just preparing a video showing the realtime transit. Cheers, Carsten
  19. It occured to me that I should share with you the timelapes of this year's Mercury transit as seen from Czech Republic. The clouds have parted for some 20 minuts, allowing me to capture this timelapse. I shot it with a modified webcam, Baader 2.25x Barlow and UV/IR cut filter, using my former SW MAK 102/1300.
  20. From the album: Astrophotography

    We set up the telescope in Cabbagetown Park, Atlanta to share the event with our neighbors. In addition to creating this image, several people took their first ever look through a telescope, witnessing a rare planetary transit of the Sun no less. This was also my first time using the solar filter and observing the Sun through my telescope. ISO 100 1/125s

    © Charles Duffney

  21. I got my 1st transit with an image.
  22. Hi, even if there are much nicer images here I like to sum up my experiences, I guess it is still worth a read to compare and learn from my mistakes. I started to prepare the day before but was to lazy to test the equipment on site, so I just checked batteries and collected all parts. More than a hour before first contact I started to set up everything. I rolled out a cable drum to get power for several hours and the first thing I found is that the power adapters did not fit into the three plug sockets on the cable drum. Meanwhile the wind started to fresh up and did blow away my sunshade. Good that it does not hit anything of my equipment, getting sun cream it was only for me. Now getting a multiple socket. Found that ony adapter gives too much voltage which my motorized focusser did not like. Getting a battery. Setting up a sun shade for my laptop. Then I started to align the NexStar SLT Goto for sun. At least I did try... What worked a few weeks before did not work anymore. I entered 12:xx:xx time then PM and NO SUN IN THE ALIGNMENT menu... Dang, as european I also tried AM because that AM/PM is quite strange for me and errror prone. Checked the sun menu, enabled. Even tried to disable it. Then I realized (now only about 20 minutes to the first contact) that whatever I entered AM/PM the next try the time was at 00:xx:xx, so that stupid scope ignored AM/PM! No chance to get the sun in the menu for alignment. DANG! I was nearly so angry to ditch all that scope into the ground. The I took a depth breath and changed the time zome to 0 (UTC) and substracted an hour to the entered time, so it now got 11:xx:xx which works with AM/PM... Celestron get your firmware right! Now focussing which was a bit hard with only the few sun spots and bad seeing. I thought I did it right, but later the mercury was not that sharp as I wished. I decided to shot every minute bursts of 5 images at ISO 200 and 1/1250s exposure time which looked good on the laptop. Then my intervallometer failed. So I triggered the camera via USB from DigiCamControl. JUST at the first contact time clouds came. DANG. So I did miss a good part of the time between first and second contact, also still struggeling with the intervallometer. After I made a ok image of the second contact I was able to get the intervallometer back to work (note to myself: investigate!) and had firstly a bit time to relax. Posted a image to a friend who was connected via chat with me. After some time I found that the images on screen where not showing the actual happening which I can see through the DSLR finder. I tried to put the images on my NAS but that seemed to be too slow, so I did gat a big delay. I though it would have been a good idea, so I could get out of the sun and process some images on my Desktop PC while they are coming in. After changing to the local disk things worked better, but then I found that I had a copy image batch in DigiCamControl to make a copy to my Desktop and there my usual Backup tried to back it up via the network (WLAN) also. Which did saturate the network quite easy... I may have worked to save the images on the NAS without that, but now I was using the local disk. HOWEVER. My mount did not track the sun very well, and with my DSLR at 1500mm focal length there is not much room at the top and bottom borders, so I had to correct the FOV every few minutes. Maybe it was the strange workaround I needed to to for the alignment, or I did entered some wrong time (even did use solar tracking speed) or the wind gusts just did their bad. So I was tied to my laptop for hours in the sun. Man I was quite tired that evening :-) What else went wrong: During the hours I swapped the camera battery and rotated it a bit. Also during messing with my intervallometer bursts are stupid. Too many images, I thought I could stack the 5 images but in the end it was too much work or I did need a script (which costs time to write) I did not refocus dust on my sensor (I guess so. check the video below) before starting a big session set back the image counter in the camera to 0000 so that it will not wrap up and mess your named sequence try everything a day before, don't be lasy even more than an hour setup time can be to few whan things go bad derotation (look at the strange curve of mercury in the video, normal at Alt/az) for the images failed because of the small and unsharp sun spots neighbors cat came to check my equipment. walked across the keyboard, could easy delete all ;-) Location was in the south of Berlin, Germany. First contact 13:12:07 and because of trees I could image until 17:00 local time. So a few words for the equipment: Celestron Mak127 NexStarSLT AltAz Goto Mount, Astrosolar filter foil (for visual), Nikon D5100, DigiCamControl to liveview and get images from the SD, DIY motorized focusser and DEW heater control (not used here...), DIY intervallometer (Arduino based). Software: For single images I used FITSwork and GIMP (2.9.x 32bit/channel). For resequencing, cropping and quality estimation I used PIPP. For making the animations from the sequences, sharpening and encoding I used Blenders video parts and bits (http://blender.org). Here is a animation of all good images including some clouds, I needed to stop at 17.00 local time (utc+1). After all I am still happy with my results. No worries here, still like that hobby :-) Cheers, Carsten
  23. My first attempt at photographing a Transit and I decided to try for the 2nd and 3rd Contacts, but of course as those in the UK will know, the final phase of the Mercury Transit was clouded out. So, here's my attempt to capture "2nd Contact" using a Canon 600D (unmodded) at eyepiece projection with a Baader Hyperion 17mm, Baader Solar Continuum filter, Lunt Herschel Wedge and a Skywatcher ED80 DS Pro on a HEQ5:
  24. This was probably my best effort... 900 frames at 12:28pm - earlier ones were battling exposure levels through the clouds! ED80, DBK camera, stacked in AutoStakkert then processed in PSCS5. Not a patch on some of the other images posted, but am pleased to have got this much!
  25. Hi all, I was lucky to have the opportunity - and the sky - to watch and sketch the transit. This sketch has been done at the beginning of the transit, showing Mercury at about 1320 CEST near the prominence at the eastern limb. Telescope: Lunt LS50 THaB600PT Eyepiece: TS HR Planetary 7mm Date & Time: Mercury transit time Location: Dusseldorf region, Germany Technique: Koh-i-Noor soft pastels and pastel pens on Daler Rowney Ebony black sketching paper Clear and sunny skies! Achim
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