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About ZiHao

  • Rank
    Star Forming

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  • Gender
  • Interests
    Stargazing, Physics, Maths, Movies
  • Location
    West Malaysia, Puchong

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  1. Hello, I am planning to build a shoe box CD grating with DSLR+18mm kit lens to analyse the spectrum of different light sources and hopefully someone will share their thoughts on the design. I am not sure about the number of lines per mm of the grating, maybe next week I will buy a laser to calculate the value but let's assume it's 625 lines/mm. I calculated the length of entire spectrum which is about 2.4cm and not sure whether this has a direct relationship with the sensor size or not, which is 2.35cm long. Any help will be appreciated.
  2. Perhaps more to the artistic way of presentation this time, this is shot on 26th February, a composite of two images, 0.5 second exposure for the branches from a forest reserve and 1/1000 second for the Moon. The interval between the two shots is about 30 seconds, which I took to change the focus of the scope and mount tracking is on if I am not mistaken. The two images are then combined on PS with the opacity of the longer exposure image lowered followed by some brightness adjustments.
  3. An open cluster containing about 100 stars located in the south of Sirius and visible in finderscope under bright skies. 25 minutes of data.
  4. It is visible even in a 1 second image and clearer as it gets higher.
  5. M64 Black Eye Galaxy 4 hours of data shot using Skywatcher 150/750 and D5300 in Bortle 8 zone. Using a black and white image this time to hide away the color gradients possibly caused by light leaking into primary mirror, nevertheless I should pay more attention to this problem since I started imaging, as it worsens everytime I pushed the image harder. DSS, PS
  6. Very interesting results Victor! Can't wait to see more reports like these.
  7. North is up. SW150p, ASI120MC, 2x Barlow,EQ3 Pro. 300*1s stacked on Registax. Couldn't resolve it visually when taking a brief look with 10mm plossl and 2x Barlow at around 8.30pm, perhaps I should wait for the scope to be thermally stable first, before sliding in the camera in a hurry to take images. Sirius B is clearly discernible in a 1 second frame as it gets higher. The stacked image was heavily stretched in PS to reveal the faint background stars, to correct for the offset in position angle by rotating the image. Eventually, Sirius B is measured to be 64.5 degrees from north
  8. Very interesting information, only found out about SA100 few months ago. Wanted to get one of these immediately but have to be patient till the stock arrived in FLO!
  9. There's one in Borneo island, 1646km away at 89.5Mhz. But at 89.6Mhz, there is a station as well about 100km away, when I tune to this frequency with my FM radio mobile app, there is only static noise. Not sure whether this will affect the results. Does the transmission power matter a lot? If yes, what's usually the minimum for meteor detection? I saw a youtube video that someone managed to receive the signal from the same station in Borneo (89.5Mhz) at about 4000km away.
  10. Hello, Recently I got interested in radio astronomy simply because clear skies are way too rare! So I plan to dip my toes in the water by doing radio meteor detection. Many on the forum are doing this by detecting the radio waves from France reflected to the receiver. In Malaysia, I think this is unfeasible, so do you guys know any transmitter in Asia that emit high power continuous wave? Not sure whether this is the key word, if there are other alternatives, please do let me know. Thanks.
  11. Great job to all participants! Clear Skies
  12. Thanks for the data! Everything done on PS and Starnet.
  13. First time processing narrowband images and thank you IKI and FLO team for the amazing data. Software used: PS and StarNet++. Workflow: 1. Auto stretch Ha, Oiii, Sii separately in Camera Raw filter. Equalize function from Olly was applied to the three channels and denoising done for Sii and Oiii channels in Topaz Denoise plugin. Lastly, sharpened using Unsharp Mask. 2. Each channel is imported into StarNet++. Starless images combined as SHO in PS. 3. Gentle stretch to the image after some light denoising. The bright core is masked with the original Sii channel to recover t
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