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stevewanstall

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About stevewanstall

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  1. NGC 1931, the Fly Nebula. 6 x 120 s at ISO 1600 and 23 x 180s at ISO1600. I only targeted this because the end of my shed (=observatory) was blocking the view of the Medusa Nebula. So, I had sometime to wait until it was high enough to image. NGC 1931 Fly Nebula in Auriga Wikipedia: NGC 1931, is an emission and reflection nebula in the constellation Auriga. The nebula has been referred to as a "miniature version of the Orion Nebula", as it shares some of the same characteristics. It is a mixed emission-reflection nebula, and contains a smaller version of the Trapezium in its hot young star cluster centered in the emission nebula. The entire cluster/nebula complex is only about 3 arcmin in size. The distance from earth is estimated at about 7000 light years. The Medusa Nebula. I thought I had previously collected over three hours of data on this object, to find the catalogue coordinates were incorrect. Incorrect (but in Wikipedia and the catalogues in Astrophotography Tool) RA 7h 29m 3s | Dec +13° 14′ 48″ Correct: RA 7h 29m 11s | Dec +13° 15′ 57″ This image is based on 26 x 180 s exposures at ISO1600. Abell 21, Medusa Nebula in Gemini Wikipedia: The Medusa Nebula is a large planetary nebula in the constellation of Gemini on the Canis Minor border. It is also known as Abell 21 and Sharpless 2-274. It was originally discovered in 1955 by UCLA astronomer George O. Abell, who classified it as an old planetary nebula. The braided serpentine filaments of glowing gas suggests the serpent hair of Medusa found in ancient Greek mythology. Until the early 1970s, the Medusa was thought to be a supernova remnant. With the computation of expansion velocities and the thermal character of the radio emission, Soviet astronomers in 1971 concluded that it was most likely a planetary nebula. As the nebula is so big, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. Because of this most websites recommend at least an 8-inch (200 mm) telescope with an [O III] filter to find this object although probably possible to image with smaller apertures. The Eskimo Nebula in Gemini looks like a blue star that's not quite right! It's pretty small in my telescope and I think is probably overexposed. This image is based on 22 x 180s exposures at ISO 1600. The inset shows some detail. Eskimo Nebula in Gemini The Eskimo Nebula (NGC 2392), also known as the Clownface Nebula or Caldwell 39, is a bipolar double-shell planetary nebula (PN). It was discovered by astronomer William Herschel in 1787. The formation resembles a person's head surrounded by a parka hood. Not enough data but a quick look at IC447 in Monoceros while waiting for the good ol' meridian flip: IC447 in Monoceros Wikipedia: IC 447 is a reflection nebula in the constellation Monoceros. In astronomy, reflection nebulae are clouds of interstellar dust which might reflect the light of a nearby star or stars. The energy from the nearby stars is insufficient to ionize the gas of the nebula to create an emission nebula, but is enough to give sufficient scattering to make the dust visible. Thus, the frequency spectrum shown by reflection nebulae is similar to that of the illuminating stars. Among the microscopic particles responsible for the scattering are carbon compounds (e. g. diamond dust) and compounds of other elements such as iron and nickel. Celestron 9.25 XLT with focal reducer at F6.3 on a Skywatcher EQ6 Pro mount. Canon 500D (modded) with LP filter. PRocessing in DSS ad PS. Never enough exposures because I want to look at so many things and clear nights are few and far between!
  2. Same night, around midnight, I only had time to get about 20 mins of data, but here it is for whats its worth. You can just make out the SN in the shot from one sub, otherwise I have over exposed the core (!):
  3. The moon was still a bit low really, but the images are not too bad, atmospheric turbulence was quite high: Schickard is a lunar impact crater of the form called a walled plain. It lies in the southwest sector of the Moon, near the lunar limb. As a result, the crater appears oblong due to foreshortening. Attached to the northern rim is the lesser crater Lehmann, and to the northeast is the even smaller Drebbel. Mare Humorum top right, part of Oceanus Procellarum on the left. Surveyor 1 landed in the faintly outlined large crater with the smaller clear one (Flamsteed) on its lower right rim. Several CCCP Luna landers arrived here, in the 1960's. "The Aristarchus Plateau is one of the most amazing and geologically diverse regions on the Moon. Surrounded by the lavas of Oceanus Procellarum, Aristarchus crater is one of the brightest features on the Moon's surface . The Aristarchus region swarms with complex volcanic features, including the Vallis Schröteri, the largest sinuous rille on the Moon . The Plateau is also home to one of the largest lunar Regional Dark Mantling Deposits. Large lunar pyroclastic deposits like the Aristarchus Plateau will be intensely studied by the next generation of human lunar explorers because their composition offers important insights into the composition of the lunar interior.This might be a future Lunar Base region... This massive deposit of fine-grained FeO-rich pyroclastic ash is one of the most accessible lunar resource deposits. Future lunar settlers could use this ash for radiation shielding and as feedstock for the production of oxygen and photovoltaic cells. Because of the geologic diversity of this region, the potential for supremely compelling lunar science investigations, and the proximity to rich deposits of readily-accessible resources, the Aristarchus region is a high-priority site for future human lunar exploration and is one of the most frequently-suggested locations for a permanent lunar outpost. The upcoming Lunar Reconnaissance Orbiter Camera is going to collect numerous 0.5 m/pixel images of this region in order to locate prospective landing sites for the future human lunar exploration that will be required to unravel the compelling, complex geology of the Aristarchus region. The crater Pythagoras is just coming into sunlight on the far upper left.
  4. Most images are based on 50 frames, stacked in Registax. Views of the terminator in a first quarter Moon: First Quarter Moon Aristoteles and Eudoxus craters, to the north of the Lunar Alps, with the Vallis Alpes (Alpine Valley). Mare Serenitatis to the upper right, part of the Mare Imbrium to the lower left Mare Vaporum, upper left Albategnius, upper left, Werner towards the centre (thought the 'X' is not clearly visible :0() First quarter mosaic Celestron 9.25 XLT at F6.3, Skywatcher EQ6 Pro, modded Canon 500D
  5. Celestron 9.25 XLT at F6.3, Skywatcher EQ6 Pro, modded Canon 500D

  6. This is based on 1000 frames at ISO 100 1/10s, taken with a Celestron 9.25 XLT on a Skywatcher EQ6 Pro, with a modded Canon 500D. Processed in Registax. More in my blog Almost first quarter, so the Moon was a good target earlier, at around 5:30 pm. Most of the images are based on 1000 frames, aligned and stacked in Registax: Almost first quarter Mare Serenitatis The Sea of Serenity, with the craters Eudoxus and Aristoteles visible upper left. Mare Vaporum The Sea of Vapours, with the crater Manilius prominent centre top. Notice Rima Ariadaeus in the centre. This is a linear rille on the Moon at 6.4°N 14.0°E. It is named after the crater Ariadaeus, which marks its eastern end. It is over 300 km long and is categorized as a straight rille because of its linear nature. Almost in the centre is the crater Julius Caesar. Julius Caesar is a lava-flooded lunar impact crater with a low, irregular, and heavily worn wall. Its diameter is 85 km. It was named after Roman statesman Julius Caesar. It is located to the west of Mare Tranquillitatis, and directly southeast of the crater Manilius on the Mare Vaporum. To the east is the rounded Sosigenes. The interior floor of Julius Caesar is relatively level, especially in the southwest half. The northern half of the interior has a lower albedo (darker) than the south. Most likely the floor has been covered or modified by ejecta from the impact that created the Imbrium basin. There are a number of crater remnants overlapping the rim along the south and northeast edges. A low ridge crosses the floor across the northeast sections of the crater. Lacus Mortis The Lake of Death, just right of top centre, with the crater Burg in the centre of it. Mare Frigoris is to the left, almost top centre. Near the South Pole. The triplet of craters to the upper left includes Abenezra and Azophi. The very dark crater upper centre is Gemma Frisius and the prominent crater with the central mountain is Maurolycus. Theophilus, Cyrillus and Catharina The triplet is to the upper right.
  7. This is based on 39 x 240s at ISO 1600, taken with a Celestron 9.25 XLT on a Skywatcher EQ6 Pro, with a modded Canon 500D. Processed using DSS and PS, with darks, flats and bias. According to Wikipedia: C 405 (also known as the Flaming Star Nebula, SH 2-229, or Caldwell 31) is an emission and reflection nebula in the constellation Auriga, surrounding the bluish star AE Aurigae. It shines at magnitude +6.0. Its celestial coordinates are RA 05h 16.2m dec +34° 28′. It surrounds the irregular variable star AE Aurigae and is located near the emission nebula IC 410, the open clusters M38 and M36, and the K-class star Iota Aurigae. The nebula measures approximately 37.0' x 19.0', and lies about 1,500 light-years away from Earth. It is believed that the proper motion of the central star can be traced back to the Orion's Belt area. The nebula is about 5 light-years across.
  8. I captured 14 x 120s exposures (C9.25 at F6.3 , SW EQ6Pro and Canon 500D) and tried making a short video, once I had noticed that it moved significantly between exposures. Panstarrs T2019 copy.avi
  9. I took this image on the same night (not EEVA though, 9.25 SCT with modded Canon 500D, 10 s exp , I think). The Sky and Telescope tool showed where the main moons should be. Apparently Umbriel and Ariel are often lost in the glare of the planet.
  10. My setup is: Laptop connected to Celestron CG5 GT mount via RS323 COM adaptor (goes to the Nexstar+ hand controller). The laptop has PHD2, Astrophotography Tool (https://astrobackyard.com/astro-photography-tool/) (this allows me to connect a DSLR, control the camera settings, view images, etc) and Carte du Ciel. The mount is ASCOM compliant so I have that installed which connects everything up. Microsoft Remote Desktop app on my tablet. This connects via my home wifi intranet to the laptop So, my choices are to sit outside (shed observatory) with the laptop , controlling everything or sitting indoors with the tablet, checking what is going on. The optimum for me at the moment is to get everything connected and tracking via the laptop directly, then just monitor via the tablet.
  11. Yet another Markarian's Chain image. I tried to ' dither' between shots (with the camera, that is, as opposed to me dithering) for the first time ever, but the tie it takes to dither meant that I lost 30 minutes of images, so this is based on around 80 mins (180 s exposures at iso 1600). The Astrometry images shows why this is an amazing sight in the sky - how many civilisations are there in those galaxies?
  12. That's really interesting to know. I haven't tried dithering before. I shall take your advice! Thank you.
  13. This is the image after being treated with HLVG (Hasta La Vista Green - free plugin for Photoshop). ED80, 180s x 19, darks, flats and bias
  14. I shall endeavour to follow your advice. Thank you for the comments
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