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Hello again from down under... This is the second last object image that I have imaged during my clear and moon less nights I was lucky to have been graced with... When I was exposing The Eagle Nebula, I imaged it through all of my narrowband filters, S2, Ha, O3 and HBeta... The first image I processed was predominantly using the standard Hubble palette SHO method (with HBeta only used for star color), but a while ago I found that using a color configuration of Ha, O3 and Hb as RGB, actually delivers colors which are very close to natural looking... with the added benefit of cutting through light pollution, allowing much longer sub exposures than with broadband RGB and potentially capturing fainter matter with more contrast. This image was taken with a 8" SCT (at the native 2032mm focal length), with a QHY268M camera and tracked using a "hypertuned" CGEM mount. The total exposure time of this image was 12 hours and 45 minutes. Exposures: Hα:17x600s, OIII:17x900s, Hβ:17x1200s @ HCG:62/OFS:25 Clear Skies, Mariusz
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Hello, We're having a horrible few months with weather down in Australia... weeks of rain, rain, rain with floods, followed by a semi clear with an occasional glimmer of hope than back to weeks of rain!!!! Having an observatory in my backyard allows me to take advantage of every clear moment, even if it's only for an hour or two... and thats exactly what I had to do to image my last few images... a game of cloud dodging was no exception to expose these two images. These images are also exposed through Ha, O3 and Hb filters for the red, green and blue channels, a method I tried out about 6 months ago and am liking this kind of narrowband near natural looking color look. To maximise my object gathering, I alternated exposures between the Pencil (NGC2736) and the Dolphin Head (Sh2-308) nebulae. I figured that at worst case scenario, I'll end up with a mono image or each object. These images could do with a few more hours of exposure time, but as the weather was not playing nice and the full moon was approaching, I decided to give it a rest and find new targets once the rain and clouds clear off. The total exposure time for the Dolphin Head was 8 hours and 40 minutes and for the Pencil was 9 hours and 50 minutes for all channels. These subs were exposed across multiple nights with throwing out around 25% due to cloud damaged subs. Clear Skies, Mariusz
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From the album: Deep Sky Imaging
The Pencil Nebula, NGC 2736, is a part of the Vela Supernova Remnant, near the Vela Pulsar in the constellation Vela, about 815 light-years away. This images total exposure time was 9 hours and 50 minutes, consisting of 13 x 600 second H-Alpha, 12 x 900 second OIII and 14 x 1200 second H-Beta 7nm narrowband channels. Taken through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera.© Mariusz Goralski
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From the album: Deep Sky Imaging
The Dolphin Head Nebula, Sh2-308 (RCW11 & LBN1052), is a bubble of gas expelled from the star EZ Canis Majoris in the constellation "Canis Major". This image was exposed in HAlpha, OIII and HBeta narrowband color. This photo consists of 12x600s Hα, OIII:12x900s OIII and 11x1200s Hβ at High Control Gain of 62 and an offset of 25. Taken from a semi rural (Bortle 4-5) sky through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera for a total exposure time of 8 hours and 40 minutes. Object name: Dolphin/Gourd Nebula Object ID: Sh2-308 (RCW11 & LBN1052) Constellation: Canis Major Coordinates: RA: 06h54m15.88s, DEC: -23°48’44.70” (star Central: EZ CMa/WR 6 & Orange: O1CMa) Distance: 4530 LY Magnitude: 7.0 Exposure Date: 09 - 13 March 2022© Mariusz Goralski
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Hello! I was looking at an UHC filter as my next upgrade for my 70mm f/10 refractor, but at the same price I found that I could get a Celestron Skymaster 15x70 binos w/a tripod(Having weight capacity of 5kgs max). SO, having same aperture isn't consider an upgrade but the large FOV will let me see the wide nebula and star cluster BUT I could get UHC filter which will improve my views, but the FOV will be tiny, so what would you do in this situation? (Also, other upgrades are welcomed) Thanks for reading my query! -
From the album: Deep Sky Imaging
Another image of one of the most popular objects imaged by astroimagers... The Horsehead Nebula/Barnard 33 with Alnitak and the Flame Nebula, but exposed mainly through narrowband filters, but emulating natural colors of the object. I was planning to combine H-Alpha as red, OIII as green and H-Beta as blue channels to create a natural colour image through CCD narrowband filters, eliminating any light pollution or moon sky-glow in the process. Unfortunately, the last night when I was able to do any imaging of subs for this object was on the 20th February before it became cloudy every day and night with constant rain. Having already completed the capture H-Alpha and RGB data, I set my exposure plan to alternate between OIII and H-Beta subs during that night, which is lucky because I only had a short window of a few hours and it turned out to be my final night of imaging for the foreseeable future. I managed to get only 3 x 30 minute H-Beta and 4 x 20 minute OIII narrowband subs. After waiting for a couple of weeks, I figured that I'm not going to get much decent time on Barnard 33 before it become obscured by landmarks so I decided to combine my currently exposed subs, H-Alpha into red, OIII into green and H-Beta into blue, as planned, and added 25% intensity from my RGB subs resulting in the image above. This image total exposure time was 9 hours and 32 minutes, channels consisting of 15 x 600 second H-Alpha, 4 x 1200 second OIII and 3 x 1800 second H-Beta 7nm narrowband subs with only 25% intensity added from the 14 subs each through red (180s), green (300s) and blue (600s) filters. Taken through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera. I think that my narrowband imaging imitating natural color experiment is (once again) successful... the first time I tried this filter to channel alignment was on the Trifid nebula last August. The advantages of exposing images through this narrowband filter to channel alignment is that most of (if not all) light pollution is rejected, imaging is possible during moon light (within reason), colors look natural, I find that more detail is captured through narrowband compared to broadband filters and narrowband filtered subs are much less susceptible to lens flares and/or internal reflections when there are bright stars near by to the object. The only disadvantage I can think of is that the subs exposure times are a lot longer, resulting in much longer total exposure times needed for each image... although I'm starting to doubt this fact now after seeing how clean my H-Beta and OIII stack ended up being when they were stacks of only 3 and 4 subs... perhaps shorter exposure time per channel will suffice?© Mariusz Goralski
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From the album: Deep Sky Imaging
The Rosette Nebula is a large spherical Hydrogen Alpha region located in the constellation Monoceros. The cluster and nebula lie at a distance of some 5,000 light-years from Earth and is roughly 130 light years in diameter. The open cluster NGC 2244 is closely associated with the nebulosity being the stars of the cluster which have been formed from the nebula's matter. The complex has the following NGC designations: NGC 2237 – Part of the nebulous region (Also used to denote whole nebula) NGC 2238, NGC 2239 & NGC 2246 – Part of the nebulous region NGC 2244 – The open cluster within the nebula This images total exposure time was 7 hours and 40 minutes, consisting of 15 x 600 second 7nm narrowband H-Alpha subs for the luminance channel and 15 x 180 second red, 15 x 300 second green and 19 x 600 second blue subs for the color data... color data was exposed during a full moon. Taken through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera.© Mariusz Goralski
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From the album: Deep Sky Imaging
This is the Rosette Nebula in HAlpha narrowband. The Rosette Nebula is a large spherical Hydrogen Alpha region located in the constellation Monoceros. The cluster and nebula lie at a distance of some 5,000 light-years from Earth and is roughly 130 light years in diameter. The open cluster NGC 2244 is closely associated with the nebulosity being the stars of the cluster which have been formed from the nebula's matter. The complex has the following NGC designations: NGC 2237 – Part of the nebulous region (Also used to denote whole nebula) NGC 2238, NGC 2239 & NGC 2246 – Part of the nebulous region NGC 2244 – The open cluster within the nebula This images total exposure time was 2 hours and 30 minutes, consisting of 15 x 600 second 7nm narrowband H-Alpha subs. Taken through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera.© Mariusz Goralski
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Hi All, As time goes on, with hectic life and a combination of (what seems like) strategically placed full moon and clouds in the sky, I find myself with less and less time to spend on the hobby... imaging is mostly automatic with my now remote accessible and controllable backyard observatory, but I still find that I'm rushing my latest images... in exposure time and processing... Either way, I had a little bit of imaging time so I decided to hit 3 objects in one clear full night... and repeat exposing the three objects through various (but the same filters) in one night... This is the famous "Flame" Nebula - NGC2024, seen in almost every Horsehead nebula image and is an emission nebula in the constellation "Orion", located about 1350 LY away. This image was a side project after the two galaxies I was imaging on the same dates (NGC1512 & NGC1232 still waiting to be processed) have drifted out of line of sight. This image would have been perfect for such a short exposure time at this focal ration if not for the corrector plate reflections caused by the bright star, "Alnitak". This image was exposed across multiple nights between 14 and 31 December 2021 for the Luminance, Red, Green and Blue channels for a total exposure time of only 3 hours and 45 minutes. Image taken through a Celestron 8" SCT at f10 (2032mm focal length) using a QHY268M astronomy camera on a CGEM mount. Clear Skies, MG
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ngc 253 John Herschel in South Africa ( NGC 253, Sculptor Galaxy )
MikeODay posted a blog entry in The Sculptor Galaxy - NGC 253
Sir John Herschel at the Cape of Good Hope Having spent the years 1825 to 1833 cataloguing the double stars, nebulae and clusters of stars visible from Slough, in the south of England, John Herschel, together with his family and telescopes, set sail from Portsmouth on the 13th of November 1833 bound for Cape Town. As detailed below, in an extract from his book, the family enjoyed a pleasant and uneventful voyage and arrived some 5 months later at Table Bay with all family and instruments in good condition. Reading on however, one might very well think that it might not have ended so well had they but left shortly after ... “... (iii.) Accordingly, having- placed the instrument in question, as well as an equatorially mounted achromatic telescope of five inches aperture, and seven feet focal length, by Tulley, which had served me for the measurement of double stars in England; together with such other astronomical apparatus as I possessed, in a fitting condition for the work, and taken every precaution, by secure packing, to insure their safe arrival in an effective state, at their destination, they were conveyed (principally by water carriage) to London, and there shipped on board the Mount Stewart Elpliinstone, an East India Company's ship, Richardson,Esq. Commander, in which, having taken passage for myself and family for the Cape of Good Hope, we joined company at Portsmouth, and sailing thence on the13th November, 1833, arrived, by the blessing of Providence, safely in Table Bay, on the 15th January, 1834, and landed the next morning, after a pleasant voyage, diversified by few nautical incidents, and without seeing land in the interim. It was most fortunate that, availing himself of a very brief opportunity afforded by a favorable change of wind, our captain put to sea when he did, as we subsequently heard that, immediately after our leaving Portsmouth, and getting out to sea, an awful hurricane had occurred from the S. W. (of which we experienced nothing), followed by a series of south-west gales, which prevented any vessel sailing for six weeks. In effect, the first arrival from England, after our own, was that of the Claudine, on the 4th of April, with letters dated January 1st.(iv.) ...” “Result of Astronomical Observations, Made During the Years 1834, 5, 6, 7, 8, At the Cape of Good Hope ... “ by Sir John Herschel, 1847 John Herschel rented a property and set up the twenty foot reflector near Table Mountain, at a site, that was then, just outside of Cape Town. The Twenty Feet Reflector at Feldhausen, Cape of Good Hope, South Africa, 1834 This telescope was made by Herschel in England and transported, along with his other instruments, by ship to Cape Town and then inland to Feldhausen. The telescope is a Newtonian reflector, built to William Herschel’s design, with a focal length of 20 feet and clear aperture of 18 1/4 inches ( f13 ). The location of the telescope was established by careful survey to be: lat 33d 55’ 56.55”, long 22h 46’ 9.11” W ( or 18.462 deg E ). The site of the great telescope was memorialised by the people of Cape Town by the erection of a granite column that is still there today. ............. Observations of the Sculptor Galaxy Amongst his many thousands of observations made from Cape Town, of nebulae, clusters of stars, double stars, the sun, etc., Sir John Herschel records that he observed V.1 ( CH10 - Caroline’s Nebula - the Sculptor Galaxy ) during two different “sweeps” and gave it the number 2345 in his South African catalogue. Sweeps: 646 - 20th November 1835; 733 - 12th September 1836 At the latitude of Feldhausen, and on these dates, the Sculptor galaxy would have been at an altitude around 80 degrees above the northern horizon when near the meridian ( which was where the telescope was pointed during Herschel’s “sweeps” ). The sight afforded from this location, with the Sculptor Galaxy almost at the zenith, must have been significantly brighter and clearer than the Herschels had thus far been granted from its location way down near the horizon south of Slough. .......... Other Obsevations by John Herschel from Cape Town Also observed by John Herschel in 1835 were the people and animals that inhabit the moon ... The Great Moon Hoax of 1825 - “Lunar Animals and other Objects, Discovered by Sir John Herschel in his Observatory at the Cape of Good Hope ... “ -
Observations of the Sculptor Galaxy ( NGC 253 ) by William and John Herschel ......... Part 2. Observations of "Caroline's Galaxy" by Sir John Herschel, 1830's Sir John Herschel, the only child of Mary Baldwin and Sir William Herschel, was born in 1792 when his father was in middle age and already famous as one of world's leading astronomers. Having excelled in school, and no doubt inspired by his famous elders, John Herschel decided upon a career as a 'man of science' and set out to pursue a wide range of interests; with one particular focus being a continuation of the study of the heavens commenced by his father and aunt, Caroline Herschel. In 1820, with the assistance of his father, John Herschel supervised the construction of a new telescope at Slough in England. As described in the extract below ( from a paper presented to the Royal Society in 1826, titled "Account of some observations made with a 20-feet reflecting telescope ... " ), the telescope had a polished metal mirror with clear aperture of 18 inches, focal length of 20 feet and was modelled on the same design created by his father. It is this telescope, in the 1820’s and early 30’s, following the death of his father and the return of his aunt Caroline to Hanover, that John Herschel used to 'sweep' the night sky and extend the catalogue of nebulae and clusters of stars that was published by his father ( see W. Herschel's Catalogue of One Thousand new Nebulae and Clusters of Stars ). On the 1st of July 1833, having complied sufficient observations, John Herschel presented to the Royal Society an updated list of the positions and descriptions of the Nebulae and Clusters of Stars that he had thus far observed. As noted in the introduction to the paper published in the Philosophical Transactions, he had planned to wait before publishing until he had complied a fully comprehensive general catalogue of objects visible from the south of England. However, due to his expectation of “several more more years additional work” needed to complete the task and his assessment that he now was in a position to address, at least in part, the then current “... want of an extensive list of nebulae arranged in order of right ascension ...”, he elected to present his list, “ ... simply stating the individual results of such observations as I have hitherto made ... “. It was not until October 16, 1863, some thirty years later, that Sir John would deliver to the Royal Society his General Catalogue of Nebulae and Clusters of Stars. As well as introducing many objects that had not previously been recorded, Sir John’s list of 1833 included a re-examination of, and in some cases a small correction to, the positions of many of the deep sky objects observed by his father and noted down by his aunt. One of these re-visited objects was, unsurprisingly, the large and bright nebula discovered by Caroline Herschel in 1783 and recorded in Sir Williams’s catalogue as V.1 / CH 10 ( object number one, of class five ( very large nebulae ) / Caroline Herschel #10 ). In total, John Herschel records around 2500 observations of nebulae and clusters of stars in his 1833 paper; with observation #61 being V.1, the “ Sculptor Galaxy “ . The measured position of V.1is given in RA and the angle from the north celestial pole ( all reduced to epoch 1830.0 ). The description can be interpreted by reference to the legend in the paper. Thus, “ A vL mE vB neb “ becomes “ A very large, much extended, elliptic or elongated, very bright nebula “. He also notes that in addition to this observation, #61, noted down from sweep #306, V.1 was also observed in sweep #292, “but no place was taken”. The figure to which he refers , figure 52, is included towards the back of his paper and is a sketch he made of the Sculptor Galaxy. to be continued ...
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Observations of the Sculptor Galaxy ( NGC 253 ) by William and John Herschel The very large and bright 'nebula' discovered by Caroline Herschel in 1783, that we now know as the Sculptor Galaxy, was observed a number of times by her 'dear brother' Sir William Herschel and by her 'beloved nephew' Sir John Herschel, Baronet. Some of these observations were recorded and published in the Philosophical Transactions of the Royal Society and, with respect to those by Sir John in South Africa, in the book of Astronomical Observations at the Cape of Good Hope. ......... Part 1. Observation of the 'class V nebula', H V.1, by Sir William Herschel, 1783 In 1782, with the fresh patronage of King George III, William Herschel, together with his sister Caroline, undertook the not inconsiderable task of transferring his astronomical equipment from Bath to Datchet ( near Windsor ) in England. Shortly afterwards, in 1983, Sir William began a "sweep of the heavens" with the very large Newtonian telescope of his design and construction. With this mighty telescope's twenty foot focal length and clear aperture of a little over eighteen and half inches, William was able to see fainter objects and smaller detail than any other astronomer of that time. ( source: The Scientific Papers of Sir William Herschel, Vol.1 ) ...... On the 30th of October, 1783, in the course of one of his "sweeps" with the twenty-foot telescope, Sir William Herschel observed Caroline's 'nebula' and noted down ( or perhaps more likely, dictated to Caroline ) a description of what he saw and a reference to its position relative to a 4th magnitude star in the Piscis Austrainus constellation, #18 Pis. Aust. ( with reference to Flamsteed's Catalogue ( or HD 214748 , HIP 111954 as we might call it )). Over the course of the next three years, Sir William would go on to view the Sculptor Galaxy a total of seven more times; as recorded in his paper "Catalogue of One Thousand New Nebulae and Clusters of Stars", presented to the Royal Society on the 27th of April 1786. ( Source ) Sir William's somewhat cryptic notes can be translated by reference to the key provide in his paper and doing so reveals the following: Class: V. ( very large nebula ) Number: 1 Observed ( by WH ): 30 Oct 1784 Reference star: 18 Piscis Austrainus ( Flamsteed's Catalogue; the best reference for the time - we might use epsilon Pis. Aust. or HD 214748 / HIP 111954 ) Sidereal direction rel. to star ( following or leading ): following star Sidereal time rel. to star: 128 min 17 sec Declination direction rel. to star: north of star Declination amount rel. to star: 1deg 39min Observed: 8 times ( up until April 1786, the date of the paper ) Description: - cB: "confidently bright" - mE: "much extended" - sp: "south preceding" - nf: "north following" - mbM: "much brighter middle" - size: 50' x 7 or 8' " CH" denotes that it was discovered by his sister Caroline Herschel The note he refers to expands on details of Caroline's discovery ... ...............................................
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scrapbook The Fighting Dragons of Ara ( NGC 6188 )
MikeODay posted a blog entry in Astrophotography Scrapbook #1
The Fighting Dragons of Ara ( NGC 6188 ) ( Please click/tap on image to enlarge page ) ------------ Link to image on Flickr -
From the album: Deep Sky Imaging
This is my first image created using my new camera. This is NGC3603 and NGC3576 (AKA The "Statue of Liberty" nebula), a massive H-Alpha region containing a very compact open cluster, located in the constellation "Carina" about 20,000LY away. I took this photo on multiple nights, between 7th - 17th May 2021. Imaged using a QHY268M attached to a 80mm f6.25 refractor on a equatorial mount. Total exposure time was 25 Hours and 35 minutes using 7nm HII, OIII and SII Narrowband filters... imaged from a bortle 4-5 semi rural sky. HII: 3x600s, 12x900s & 8x1200s subs OIII: 18x900s & 11x1800s subs SII: 21x900s, 2x1200s & 7x1800s @ HCG:62© Mariusz Goralski
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From the album: Deep Sky Imaging
The Carina Nebula (NGC 3372) also known as the Grand Nebula, Great Nebula in Carina, or Eta Carinae Nebula, is a large complex area of bright and dark nebulosity in the constellation Carina. The nebula lies at an estimated distance between 6,500 and 10,000 light-years from Earth. This image was taken from my backyard in Bortle 4-5 skies through a 80mm refractor at F6.25 (500mm focal length) with a QHY268M camera through 7nm H-Alpha, SII and OIII filters. Total exposure time was 5 hour and 50 minutes. Subs captured were HII: 12x600s OIII: 2x600s & 4x900s SII: 10x900s @ HCG:62 on 18th May 2021.© Mariusz Goralski
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From the album: Deep Sky Objects
The Carina Nebula is a large complex area of bright and dark nebulosity in the constellation Carina. It is located in the Carina–Sagittarius Arm, about 8,500 light-years from Earth. Pro Dataset @telescope.live Telescope: ASA 500N Focal Length: 1900 mm Mount: ASA DDM85 Camera: FLI PL 16803 H-Alpha: 3x600s OIII: 3x600s Bicolour Processing: Pixinsight-
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From the album: Deep Sky Imaging
This is NGC3603 and NGC3576 (AKA The "Statue of Liberty" nebula), a massive H-Alpha region containing a very compact open cluster, located in the constellation "Carina" about 20,000LY away. I took this photo during two nights, 14th and 15th March 2021. Imaged using a active cooled and full spectrum modded Canon 40D DSLR attached to a 80mm f6.25 refractor on a CGEM equatorial mount. Total exposure time was 3 Hours and 31 minutes in natural color through UV/IR Cut filtered subs from a semi rural sky. RGB: 19x60s, 19x120s, 18x180s and 20x300s subs @ ISO1600.© Mariusz Goralski
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Nikon D5100 + WO ZS73 II Star Adventurer Pro 150 x 30 sec + DOF
© AstroM1
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From the album: Deep Sky Imaging
NGC 6357 is about 5500 light years away in the constellation Scorpius near the better known NGC 6334, AKA the "Cat's Paw" or "Bear Paw" nebula. This nebula was also given the name War and Peace Nebula because of its appearance in infrared images, the bright western part resembles a dove and the eastern part looks like a skull. This photo was taken through a Celestron C8 8" SCT at f6.3 (1280mm focal length), tracked on the CGEM and exposed using a full spectrum modded and cooled Canon 40D DSLR. Total exposure time through the SII, HAlpha and OIII filters was 40 hours.© Mariusz Goralski
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From the album: Deep Sky Imaging
NGC 6357 is a nebula about 5500 light years away in the constellation Scorpius near the better known NGC 6334, AKA the "Cat's Paw" or "Bear Paw" nebula. This nebula was also given the name War and Peace Nebula because of its appearance in infrared images, the bright western part resembles a dove and the eastern part looks like a skull. This photo was taken through a 8" SCT at f6.3 (1280mm focal length) and exposed using a full spectrum modded and cooled Canon 40D DSLR.© Mariusz Goralski
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From the album: Deep Sky Imaging
This is a close up of IC 2944, also known as the Running Chicken Nebula or the λ Centauri Nebula, with the Bok Globules visible in the upper third of the frame. IC2944 is an open cluster with an associated emission nebula found in the constellation Centaurus, near the star λ Centauri. This image was exposed using a Cooled and full spectrum astro modded DSLR through a 8" SCT at it's native 2032mm (f10) focal length. The total exposure time was 8 hours and 25 minutes, through a UV/IR filter to capture natural colour data.© Mariusz Goralski
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From the album: Nebulae
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From the album: Nebulae
© Graeme Healey Photography
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From the album: Nebulae
© Graeme Healey Photography
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From the album: Nebulae
© Graeme Healey Photography
