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About jimao22

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    Star Forming

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  • Interests
    Astronomy and astrophotography (solar and deep sky for the moment), ATM, DIY observatories
  • Location
    Ploiesti, Romania

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  1. Hi, This is Iris nebula (NGC 7023 from Cepheus) trough my set-u for astrophotography: MN190 (mak-newt) on EQ6 belt-drive, ASI ZWO 533MC as main camera and QHY5II-L mono as guiding camera (OAG). The result is a stack of 41 exposures, 5 min each, from a Bortle 5 zone. Is amazing how CMOS camera and especially this one can work on a light polluted sky in full broadband. Acquisition, calibration with dark, flat and bias, debayering and stack - MaximDL, background neutralization, Photometric Color Calibration, ABE, SCNR, MMT, Histogram Transformation - in Pixinsight, Contrast, star reduct
  2. After a while doing my best to have a very "perfect" set-up, highly automated, I find that doing pictures in the old way fashion is not bad at all. Moreover, you can take you light set-up with you and find dark locations or find places where transient phenomena occur (like ISS transit over Sun or Moon, sun eclipses or so) so to have such a set-up is not a bad idea at all. Having this in my mind, I prepared a set-up for this purpose. It is composed mainly from a iOptron Skyguider Pro and an Omegon 66/400 apo refractor. This set-up is in continuous improvement and seems to be a great idea.
  3. Hi, This is the second target with my new color camera from ZWO. I have another shot to this target, from few years ago, but that one was a mono image, so I went back to it to see how it look like in colors. The rig used is my set-up from observatory - EQ6 belt-drive, MN190, OAG, automation with SELETEK and so on. The result is a stack of 32 x 300 sec images.
  4. Hi! This is my first image made with my new ASI ZWO 533MC camera. The target was M81 and the picture is a result of 50 shots x 300 sec, -20 deg. C, with my MN190 Maksutov-Newtonian astrograph on EQ6 belt-drive, from my backyard observatory. The sky is Bortle 5 on my location. The workflow for processing was the following: calibration with dark, bias and flats in MaximDL, debayering in Maxim again, alignment and stack in Maxim one more time and the rest of operations - MaximDL and StarTools.
  5. Hi. On 15-th of December I made some exposures to this lovely comet, very visible and very fast on the sky. So I took exposures 60 sec long with a pause between shots of 120 sec. The film is on the link, down bellow.
  6. These days I was at some star-party into the mountains and I finally made the tests with the ATIK 460EX. The field is the bigger I can obtain with what I have and due to this fact, I made some exposures to Amdromeda and Pleiades. Andromeda is 27x60s+30*x20s+30x5s. M45 is 47x60s. All procesed in PI without calibration, no filters at all and a Moon at 35%.
  7. Finally I had some decent weather and I made some exposures with my new rig: the home-made mount, the Omegon 66/400 and the ASI 174 camera. All images have the roundness less than 0.1 (measured in MaximDL) and I found that is no need for long exposures to have very good results. The final result is a balance between the shortest exposure you can do it with a good enough SNR (1) and the longest exposure you can afford with a good roundness (2). (1) depends on the local light polution, the contrast between the deep-sky object and the sky background (2) depends on the mount accuracy
  8. Due to the very bad weather this spring time, it was very hard to find a good night for testing properly the new mount. But somehow I find a proper night being with one of my astro buddies in my observatory. I made a lot of exposures with Sharpcap but the darks and flats made with MaximDL didn't work to calibrate these images. I suppose is some kind of incompatibility in acquiring the data. Even if I tried to make new darks and flats few day later using the same Sharpcap, I didn't obtain better results. The best results I obtained when acquisitions were made with MaximDL - lights / darks / fl
  9. You cannot see it because is on the back side of the mount, where the motor is. Is not rocket science, is just a screw that make a lever to push the motor axis on the sector. Is not big deal.
  10. The friction drive can be adjusted with a screw. You cannot preload by pushing the shaft other than using some kind of lever operated by a screw. So is adjustable.
  11. An update to this project. After few runs for testing the pros and cons for this mount, I made some technical adjustments. 1. I had some problems to polar align the mount, due to the fact the polar scope was not illuminated. So I bought a device for this purpose, a part of the modular system of Star Adventurer mount. Problem solved. 2. I had problems to obtain a good focus for the stars. So I made a Bahtinov mask who fit perfect to my Omegon 66 telescope. The Bahtinov mask is a wired one - a mask with some good advantages over a regular one due to the fact an increased quantity of l
  12. Hi, As you can see in the pictures with the star shape analysis, the mount is working great, so the concept is very good. Moreover, I am sure the results will be better than usual commercial mounts same class because the friction drive is very stiff an robust and allow greater weights to be worn. The bearing is a radial SKF one and is mounted with a press, like the ones used in the car maintenance. And the machining was very precise being done on a CNC machine wit a high accuracy.
  13. We have an update from the astronomer Pablo Santos Sanz from IAA Granada, the coordinator of this project. He sent us some preliminary data and a map with the observers of this event. Is truly a rare event, as he said in the mail received. " I have generated a preliminary elliptical fit to the shape of Huya that I am attaching (North is up, East to the left). In my attached fit I have removed the scale in kilometers and the observers legend. Data are still under analysis and we cannot provide numbers in order to "protect" the future scientific publication currently in preparation.
  14. I made some (poor) photometric analysis in MaximDL with my data. What I know is the shape of the light curve is correct. I don't know (yet) how to adjust the parameters inside the program to have right magnitude of the stars. I used 1 reference star and 1 check star. I made 2 graphs - first made from all my data (around 790 exposures) , to see if any other object intersect the path of star light and the second graph made from only 70 exposures centered around the occultation itself, to have a clearer idea about the shape of the curve. Is not to much, but it is fun - I can tell you.
  15. Is interesting that as we know till now, only 14 astronomers had took pictures to this occultation and 11 of them are from Romania. The one who did organize the whole event was Marcel Popescu, a Romanian astronomer from La Palma, so perhaps this is the reason why so many Romanians... Thanks for sharing the program. I will give him a try asap.
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