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elpajare

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Everything posted by elpajare

  1. The IMX294 C chip is very sensitive and for this type of weak objects it works well. Thanks for the feedback Mike......I think I see UGC 957 in your photo !
  2. ARP 157, NGC 520 and companion. Disturbed with interior absoption Challenge: Faint tails N and S and companion UGC 957 RC 203 + Risingcam IMX294 no cooled+ UVIR 15x25" stacked with Risingcam software+ Startools
  3. Ritchey-Chretien 203 mm+ Risingcam IMX294 no cooled+ UVIR filter 15x 25 " , Risingtech capture soft, gain máx. all parameters by default Processed with Startools
  4. Fantastic shots. How lucky to see the southern hemisphere sky. You will have some good memories of the trip to your home
  5. NGC 5614 is a spiral galaxy in the constellation Bootes. It is the primary member of the Arp 178 triplet of interacting galaxies with NGC 5613 and NGC 5615 TSO RC 8" + Risingcam IMX294+ Risingsky software 10x25" + DFC+ Startools
  6. I chose the EEVA because I like simple things, so I use alignment to a one star close to the object I'm going to visit and center this allign star with a 50/205 mm finder + an illuminated eyepiece of 26 mm. I also do not like the 6-bolt fastening system because the finder moves too easily. I've tried and rejected all laser finders because the red dot shines too much for most alignment stars
  7. Actually these galaxies are very interesting. But at the moment I continue with my particular marathon of objects of equal or less than 12 magnitude and until I finish it I can not start a new one. If the Mediterranean sky behaves moderately well I hope to finish it this year. Between all we are going to obtain a quite complete collection of celestial objects...
  8. IC 983+IC982/ARP 117 is a 11th magnitude Spiral Galaxy appearing in the constellation Bootes. It is 267 million light years from our solar system NGC 5490C /ARP 79 is a 15th magnitude Spiral Galaxy appearing in the constellation Bootes. It is 277 million light years from our solar system. TSO RC 8" + Risingcam IMX294+ Risingsky software 10x25" + DFC+ Startools
  9. NGC 4775 is a 11th magnitude Spiral Galaxy appearing in the constellation Virgo. It is 77 million light years from our solar system. NGC 4786 is a 11th magnitude Elliptical Galaxy appearing in the constellation Virgo. It is 216 million light years from our solar system. PGC 43771 is a 15th magnitude Galaxy appearing in the constellation Virgo. It is 323 million light years from our solar system. PGC 1030299 is a 16th magnitude Galaxy appearing in the constellation Virgo. It is 219 million light years from our solar system. TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
  10. Well, the hobby erases borders. I have learned a lot, almost everything I know, in an American forum. At least we behave like inhabitants of planet earth, without borders or languages (thanks GOOGLE!)
  11. This subject is quite hidden and with very low participation, maybe if it were taken to the section of EEVA would have greater participation?
  12. The latest versions of Risingsky have the option of taking and applying the so-called "flats". Actually I do not use them for EEVA because any subsequent treatment with Startools, Pixinsight or similar perfectly corrects the defect. The IMX224 has been and continues to be, in my opinion, one of the best and cheapest chips for EEVA, it is very sensitive and combined in an appropriate way with a telescope like the SKW Quattro 8 " it gives a magnificent result in small and weak objects like galaxies , planetary nebulae and globular clusters In the link of my signature you can consult the Telescopius some of the results. Effectively FOV is the main parameter in EEVA if we want to have the maximum detail . The idea is that the main object occupies most of the FOV and this forces several camera / telescope combinations. The size of the IMX224 makes it impossible ( or very difficult) to use it in medium or large objects, so for these cases I use the IMX294 without refrigerating of Risingtech combined with a TSoptics RC 6 "or a TSoptics APO of 3". I am waiting for the first bright nebulae to appear in the East to be able to make the first tests!. Previously I used ATIK Infinityvand even the Panasonic P / MN34230 (ASI1600) but the Infinity had problems with the color balance and the ASI1600 little sensitivity for EEVA. The IMX 178 is a good chip but it does not work well for EEVA, it is not very sensitive and you have to increase the exposures that you will need work guided to have acceptable results and that is already Astrophotography not EEVA.....IMHO
  13. Thanks for the comment Risingcam cameras use their own software that allows you to take and apply the so-called Dark Frames or Dark fields. DFC stands for Dark field Correction.
  14. OK, thanks. Is the IMX290 chip. A good choice for EEVA. Have you tried the native software of this camera, the Risigsky software? To me it seems very complete and easy to use
  15. This is an interesting observation about this galaxy published in the Astrophysical Journal v.451, p.156: "A remarkable structure in the innermost regions, composed of four main unresolved sources symmetrically distributed around the center, is apparent in all R, I, and Hα images". The image, taken with amateur media and with the EEVA system allows us to distinguish some of the details that the authors mention in their report quite well. The color also helps a lot. The link: http://adsabs.harvard.edu/abs/1995ApJ...451..156G TSO RC 8" + Risingcam IMX294+ Risingsky software 10x25" + DFC+ Startools
  16. I see you are using a Risingtech camera but I can not find it on his website. Could you put a link please? Thanks.
  17. NGC 4665, also catalogued as NGC 4624 and NGC 4664, is a barred lenticular or spiral galaxy located in the constellation Virgo. It is located at a distance of circa 60 million light years from Earth, which, given its apparent dimensions, means that NGC 4665 is about 75,000 light years across. NGC 4665 lies 2 and 3/4 degrees east-south east of Delta Virginis and 50 arcminutes southwest of 35 Virginis. It can be viewed through a telescope at a 23 magnification, forming a pair with an 11th magnitude star 1.5 arcminutes southwest. It is part of the Herschel 400 Catalogue. It was discovered by William Herschel on February 23, 1784, however, he noted a location 10 arcminutes off the galaxy, where there is no object. It was observed by William Herschel again on April 30, 1786, noting the correct coordinates, and he misidentified it as another nebula. The fact that they are the same object was noted by John Louis Emil Dreyer in 1912 in the corrections of the New General Catalogue. It was also recorded independently on April 9, 1828 by John Herschel. NGC 4665 has a luminous, slightly elliptical bulge and a prominent bar with high surface brightness. The isophotes appear boxy at the end of the bar. The total bar length is estimated to be near 3 kpc.[9] The bar is slightly twisted, turning near 12 degrees along its axis. Two diffuse, faint arms emerge from each side of the bar and form a pseudoring. The surface brightness of the arms is higher near the bar. The southern arm appears a bit stronger. An arch feature is observed at the east side of the galaxy that could be a partial outer dusty ring. The outer isophotes are elliptical. The total mass of molecular gas is less than 107.3 M☉. NGC 4665 belongs to the NGC 4636 group. Other members of the group include NGC 4457, NGC 4586, NGC 4587, NGC 4600, NGC 4636, and NGC 4688. These galaxies, along with NGC 4753, Messier 61 and their groups form the southern boundary of the Virgo cluster. It can be difficult to determine which galaxies belong to which group, especially around the southern edge of the Virgo cluster where there is a confusion of galaxies at different distances. Wikipedia TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
  18. In this image we can see the galaxy NGC 4535, in the constellation of Virgo (The Virgin), with a beautiful backdrop formed by numerous weak distant galaxies. Its almost circular appearance tells us that we almost observed it face-to-face. In the center of the galaxy there is a well-defined bar-shaped structure, with dust paths that curve before the arms of the spiral break to the end of the bar. The bluish color of the arms of the spiral indicates the presence of a large number of hot young stars. In the center, however, colder and older stars give the bulb of the galaxy a yellowish appearance. NGC 4535 has a ghostly and diffuse appearance, which inspired the well-known amateur astronomer, Leland S. Copeland, to call it "The Lost Galaxy" in the 1950s. TSO RC 8" + Risingcam IMX294+ Risingsky software 10x25" + DFC+ Startools
  19. NGC 4532 is a 11th magnitude Irregular Galaxy appearing in the constellation Virgo. It is 36 million light years from our solar system formed in a H I high density zone in Virgo: A 500 KPC HI EXTENSION OF THE VIRGO PAIR NGC 4532 / DDO 137 DETECTED BY THE ARECIBO LEGACY FAST ALFA ( ALFALFA ) SURVEY Rebecca Amy Koopmann, Riccardo Giovanelli, +6 authors Oded Spector Published 2008 We report the discovery of a ∼500 kpc HI extension southwest of the Virgo Cluster HI-rich pair NGC 4532/DDO 137, detected as part of the Arecibo Legacy Fast ALFA (ALFALFA) Survey. The feature is the longest and most massive HI tail structure so far found in the Virgo Cluster and, at 1.8 Mpc from M87, the most distant from the main concentration of the intracluster medium. The structure is spatially and spectrally separated into two ridges and is defined by diffuse emission and discrete clumps of mass 2.5 6.8 x 10 M⊙. All emission is blue-shifted with respect to the NGC 4532/DDO 137 pair emission. Including diffuse emission, the structure has a total mass of up to 7 x 10 M⊙, equivalent to ∼10% of the system’s HI mass. Optical R-band imaging finds no counterparts to a level of 26.5 mag arcsec. The characteristics of the structure appear most consistent with a tidal origin. TSOPTICS RC 8"+Risingcam IMX294+ Risingsky software 10x25" DFC+ Startools
  20. NGC 4526 is part of the Virgo cluster of galaxies. Ground-based observations of galaxies in this cluster have revealed that a quarter of these galaxies seem to have rapidly rotating discs of gas at their centres. The most spectacular of these is this galaxy, NGC 4526, whose spinning disc of gas, dust, and stars reaches out uniquely far from its heart, spanning some 7% of the galaxy's entire radius. TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
  21. The galaxy was discovered in 1784 by William Herschel, who described this region as having “a pretty bright star situated exactly north of the centre of an extended milky ray”. Of course the “milky ray” seen by Herschel is actually this spiral galaxy, but with his 17th century observing gear he could only tell that there a fuzzy, blurry structure below the much brighter star. TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
  22. Another wide field of Zwicky's TSO RC 8"+ Risingcam IMX294 10x25" DFC+Startools
  23. NGC 4527 is an intermediate spiral galaxy similar to the Andromeda Galaxy and is located at a distance not well determined, but usually is considered to be an outlying member of the Virgo Cluster of galaxies, being placed within the subcluster known as S Cloud. Unlike the Andromeda Galaxy, NGC 4527 is also a starburst galaxy, with 2.5 billion solar masses of molecular hydrogen concentrated within its innermost regions. However said starburst is still weak and seems to be on its earliest phases. Wikipedia TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
  24. NGC 4939 has been characterised as a Seyfert galaxy, a galaxy category which features bright point-like nuclei. NGC 4939 is a type II Seyfert galaxy. Its X ray spectrum is more consistent with a Compton-thick cold reflection source, which means that the source is hidden behind dense material, mainly gas and dust, and the X-ray observed have been reflected, but a Compton-thin transmission model could not be ruled out. The equivalent width of the FeKα line is large, indicating too that it is a Compton-thick source. Further observations by Swift Observatory confirmed its Compton-thick nature. The source of activity in the active galactic nuclei is a supermassive black hole (SMBH) lying at the centre of the galaxy. The SMBH at the centre of NGC 4939 is accreting material with a rate of 0.077 M☉ per year. The black hole has been detected in hard X-rays, which are not absorbed by the Compton-thick column, by INTEGRAL. The galaxy has a large elliptical bulge and maybe a weak bar. It is a grand design spiral galaxy, with two tightly wrapped arms emanating from the bulge. The arms are thin, smooth and well defined and can be traced for nearly one and a half revolutions before fading. Two symmetric arm sections or arcs are observed in the central part of the galaxy. The galaxy is seen with an inclination of 56 degrees. The rotational speed of the galaxy is about 270 km/s. Wikipedia TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
  25. NGC 4713 is a 11,7th magnitude Spiral Galaxy appearing in the constellation Virgo. It is 48 million light years from our solar system. NGC 4713 appears roughly 1.7 x 1.5 arcminutes in size, corresponding to a physical diameter of 23153 light years. It is a spiral galaxy of morphological type Scd, and is receding at 651 kilometers per second - about 0.2% of light speed. TSO RC 8" + Risingcam IMX294+ Risingsky software 10x20" + DFC+ Startools
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