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Showing content with the highest reputation on 17/07/18 in all areas

  1. 11 points
    NGC 6888 The Crescent Nebula in Ha/OIII with RGB stars. 14 hours total integration: RGB at 10x300s each, Ha 26x900s, OIII 20x900s. I wanted to get good contrast between the inner Ha and OIII outer shell (which is fainter that the Ha) and so tone-mapped before stretching, to enable comparable signal strength between them. Ha mapped to red. OIII mapped to blue. Green was a blend of 30% Ha and 70% OIII. And just for fun I did an OIII-only version too.
  2. 5 points
    Really pleased with this and especially the nebulae around the outside of the Crescent. Right ascension 20h 12m 7s[1] Declination +38° 21.3′[1] Distance 5,000 ly Apparent magnitude (V) +7.4 Apparent dimensions (V) 18′ × 12′ Constellation Cygnus Canon 1000d Modded Dithered in APT 24 x Lights 16 x Flats No Darks No Bias Roger
  3. 4 points
    A beautifully clear and moonless Sunday night and after a day of swimming and sunbathing I just couldn't be bothered to go outside. With just Jupiter and a little bit of moon for company since May, I wondered if the astronomy fire was dwindling inside me. Luckily, Monday night was unexpectedly clear so I had a chance to give it a stoke. I set up still with the discomfort that's been with me for a few weeks and noticed that sky was not sharp enough to resolve much on Jupiter or dark enough to see much else. Saturn was nice to see after a year. Sagittarius was my main target as I had never seen it with a UHC filter and now I had one. The Swan actually looked like an upside down swan and the Eagle had clear (though a lot less) nebulosity. The Dumbbell looked great too. Overall, I feel I'm not much of a filter person yet. My fingers are too clumsy, star-hopping is more difficult and I'm still not up to spending enough time on a target to make all that screwing and unscrewing worthwhile. Obviously, the sky had changed since May and I found I was less familiar with it. I tried a few doubles- Izar, Alberio and Iota Cass. Iota Cass is one of my favourites but I could only split it in two last night. I went to 150x and a split was hinted at. I kept my rarely used 6mm in the scope and turned it on Saturn and what a revelation. The best view I've ever had. Clear and beautiful. When I looked up it was astro dark time and the sky was breathtaking with the milky way clear. I looked at Bodes and the Cigar- still probably the most amazing site in the sky. Oh, and I nearly forgot Mars. I can't believe how much bigger it was. It was too low to be able to observe seated so I wobbled about bent over. I'm starting to see the Mars attraction and I can see how time spent on it will be rewarded. In the end, as the time went on, I changed from going through the motions to something like excitement. I'm still not back to my old self but I'm definitely on the way back. Darkness rules. Thanks for reading.
  4. 3 points
    Took this over Saturday and Sunday at Deep Sky Camp near Hastings , England. Constellation Triangulum Right ascension 01h 33m 50.02s[1] Declination +30° 39′ 36.7″[1] Redshift -0.000607 ± 0.000010[1] Helio radial velocity -179 ± 3 km/s[2] Galactocentric velocity -44 ± 6 km/s[2] Distance 2.38 to 3.07 Mly (730 to 940 kpc)[3][4] Apparent magnitude (V) 5.72[1] Characteristics Type SA(s)cd[2] Mass 5 × 1010[5] M☉ Number of stars 40 billion (4×1010)[6] Size ~60,000 ly (diameter)[6] Apparent size (V) 70.8 × 41.7 moa[1] Canon 1000d Modded Dithered in APT 40 x Lights at 300 second subs 22 x Flats No Darks No Bias Roger
  5. 2 points
    I don't wish to interrupt, but.... You should have members queuing to buy these power packs. Why are so many people still using lead acid? Lithium battery packs that are properly made (Tracer is one) always include control electronics to prevent over charge, over discharge, and over load. Lead acid packs give no protection and one forgotten over discharge can mean a journey to the dump. Lithium far out performs lead acid and NiCd/NiMH in power to weight and volume figures. It also works well in the cold - unlike the older competitiors. Don't think of the youtube videos showing flaming power packs. These are shoddily made products from China - a bit like some copy scopes. So why am I not PMing to buy? The simple answer is I have been using lithium for years in all sorts of applications. Not just astro kit. It is my first choice rechargeable power. I already have enough lithium cells and assembled packs to run all my portable gear so offer others the opportunity to move out of the past.
  6. 1 point
    Taken some images from yesterday mornings session and had a go at combining three of them to form a mosaic of sorts. With the ZWO ASI120MM having such a small chip size I thought I would start small with just a few shots to see if I could do it. With some more practice and time hopefully I can build on this. Thank you for looking in. John
  7. 1 point
    I am still trying to get a handle on the asi 1600's method of imaging for broadband. Spoiler alert: DO NOT VIEW AT FULL RESOLUTION (or limit such viewing to the brightest areas). I am struggling with exposure times. I find that due to download times and "wait" times (what ever that is), coupled with dither delay times, plus adding 10 min or so for refocusing, the collection of 1 hour of data using 30sec exposures takes almost 2 hours. So, what ever time benefit I gain by shooting at F3 over F5.4, I loose due to the infernal delays. I have my dither delay set at a bare minimum 10 sec. I have not been able to determine what the "waiting" delay is for--download perhaps? 15-20 sec seems exorbitant for download. Any way, this image consists of 100 30sec Red subs and 30 60sec Red subs (conditions were too poor for Lum). I am seriously considering going to 2min. Much longer than that and we get into "what is the benefit of F3 territory". On the other hand, the longer the subs, the less a 20 sec delay between subs adds to the total imaging time. So this image contains 1 hour and 20 minutes of data. Conditions were deplorable in general, with a moderately clear zenith, which is where most of this data came from. Bottom line...80min should be enough to render a smooth, low noise Red stack . The total integration times between the STT-8300 and the ASI 1600 are typically said be comparable--the 8300 requiring less subs of longer duration and the asi 1600 requiring more subs of shorter duration. Combine this with shooting at F3, and I expected the total integration time of a stack to be 30-40 min. Maybe an hour. This is far from the reality I have seen. For bright areas it seems to be closer to truth, especially during pristine conditions (ie M8/M20, M31). But if I am ever goin to attempt the IFN, I need to dial it in better. So far, all attempts have been at unity gain. Offset no longer variable.
  8. 1 point
    Glad your trip was not a total waste, despite Mars refusing to play ball during most of it. There are some nice objects in Scorpio that are "just out of reach" from our latitudes.
  9. 1 point
    Very true... all of my images have a big element of luck involved...
  10. 1 point
    Magnificent Image/gif Avani. It would be interesting to know what magnitude the star HD168233 actually is.
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