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Posts Made By: Dmitri Kulginov

November 19, 2006 03:47 PM Forum: Equipment Talk

Play in the geared head

Posted By Dmitri Kulginov

My Manfrotto (or Bogen) 410 geared head has developed play in the altitude gear. I took the head apart a couple of times, but everything looks just fine, I cannot figure out where the play comes from or how to fix it.

Any ideas?

Dmitri

November 23, 2006 10:26 AM Forum: Eyepieces

Orthos in binoviewer

Posted By Dmitri Kulginov

Will 4mm Ortho (volcano top) work well in a binoviewer, or is the eye relief too tight? (It doesn't bother me with one eye.)

Dmitri

December 25, 2006 07:17 PM Forum: Deep Sky Observing

Geminids night in El Salvador

Posted By Dmitri Kulginov

Finally I feel rested enough to write a report about my observing session in El Salvador.

On my way there, I picked in Miami an Oberwerk Ultra 15x70 binocular - an excellent instrument. It has been reviewed on CN by Ed Zarensky and by Roland Christen his web site. The binocular is extremely bright; I had it mounted on a light photo tripod.

It is not safe to move around in El Salvador; my local acquaintance, a guide, contacted Asociación Salvadoreña de Astronomía and they invited us to an observing session on the 14th of December. The observatory is well built and equipped - they have a 10 inch SCT and a 20 inch Obsession dob - neither of them was out that night. When we arrived around ten o'clock, there were already some people sitting in chairs and counting the Geminids. [ The meteor shower was excellent, we had counted more than 200 in 1.5 hours. ] After some counting I set up my binocular and stared in confusion at unfamiliar star fields. Orion was in zenith, Canopus rising, and I could not easily identify anything between them. A very experienced AA, Leonel Hernandez, offered me some help with finding NGC 253. The galaxy was amazing - bright, large and elongated; a bright globular cluster NGC 288 was practically in the same field of view. I looked at 253 for 5 minutes; after that Leonel suggested to take out a 12cm achromat. We looked at the galaxy in the refractor at low and medium power. It was very mottled and three foreground stars were seen. This is an amazing galaxy and in a sense I like it more than M31 which is rather plain.

After that I proceeded (with Leonel's help) to NGC 55 - large, dim and elongated in the binocular. NGC 1291 was also an easy target. Hereafter I could proceed with my atlas by myself. Fornax A and 1326 were small and rather bright, as were 1365 and 1386. I attempted the Fornax and Sculptor Dwarfs, but they were low and the transparency was not very good. But I could see NGC 247 - it was rather dim. Globular cluster NGC 1851 was bright and very concentrated. I could only resolve a few outliers in 12cm at medium power. Leonel mentioned two dim galaxies nearby, 1792 and 1808, we both could see them in the binocular!

To finish the session, I went through some Northern showpieces - M31, M33, M45, M42 which was in zenith and looked like a giant bird. The last target was the Rosette nebula. I found its cluster with naked eye; to my surprise, I could see the tenuous wreath around it in the binocular without any filters!! Amazing.

Dmitri

January 20, 2007 12:52 PM Forum: Deep Sky Observing

Observing session January 19

Posted By Dmitri Kulginov

I haven't been to my dark site for four (!) months, prevented by travel, the Moon, and - most of all - the bad weather. Finally, the forecast showed a clear evening (but a cloudy night), and I drove to my dark place. It was somewhat of a gambling, but the clouds never came while I was there. I had with me my new 15x70 binocular, my old 10x50 - to plug some holes in its Messier survey, and C8 with my new binoviewer.

I started with 15x70. This binocular still amazes me with its capabilities. I had a Dew-not eyepiece strip wrapped around the eyepieces to prevent dewing. M74 was immediately obvious with averted vision, and I could see the brighter central part. It was beautiful! M76 was small, but clearly nonstellar. At last I had a good look at M34 and saw some individuality there: it was like a square box of stars, three per side, and a blown-up version of M29 inside. The view was very photographic!

Next to galaxies: I found NGC 185 pretty easily (Warren, thanks for reminding!) as a soft glow between two stars. A look in the Millennium Atlas confirmed that. I couldn't see 147, but I could not see it in C8 either - the sky was not transparent enough. I couldn't see the spiral arms of M33 however I tried - but I saw them clearly with C8 later. M77 was star-like with direct vision, but increased in size with averted vision. The open cluster/galaxy pair in Cepheus, 69639/6946, was clearly seen and the cluster showed some resolution. The large nebula IC 1396 was also pretty obvious, I estimated its diameter 2 degrees. I tried the California nebula - to no avail. But I could easily see the white dwarf companion of Omicron 2 Eridani. Later I could see the dwarf's own companion - an X-ray source - with C8.

After that I mounted 10x50 and looked at M74. It was still there, but small and hard to see. M76 was seen at times as a small speck, and M77 looked like a nebulous star. 6939 was still seen well, but 6946 was difficult. M79 was small but obvious.

C8 had cooled down by now. I used the orange Beta Andromedae as one of the alignment stars, and NGC 404 was very bright close to it - a striking view. The equal stars of M38 filled the field of view, and its compact neighbour NGC 1907 showed a dozen of small equal stars. 891 was obvious at 90x, and I saw the dust lane at 230x clearly with averted vision. 1023 looked like a small version of M31. M33 looked like a knife of a kitchen appliance - the classical pin-wheel look. M77 had a very bright but not stellar central part, and a beautiful disc around it. Besides that I looked at some galaxies from Hartung's list - 246, 524, 772, and 936. I like this list and the book very much!

Finally, I put the binoviewer in C8 and looked at M42. It was MIND-BLOWING!!! I could see the full circle of the nebula with 20mm eyepieces. 884 filled the FOV with stars; I sat there, very relaxed, and could not stop watching.

When I almost started to pack my gear, a guy came by and I showed him M42, 884 and Saturn with four moons, all in 24mm Panoptic. He obviously had a navy connexion, because when he saw 884 he started to describe his night dives: when the water is clear, the reflexions of his lamp from the ripples on the surface create a similar effect. [ I should try that! ] All in all, an extremely satisfying night.

Dmitri

January 23, 2007 02:30 PM Forum: Deep Sky Observing

Observing session January 22

Posted By Dmitri Kulginov

After some rainy weather, the forecast had promised a clear night. The cold removed the moisture from the air, and the evening was very clear, with almost no colour in the sunset. I headed to my dark place with another member of the local astronomy club, Mattias. I had my equatorially mounted C8 and my high quality 15x70 binocular, and Mattias had his fork mounted C8 and a piggy-backed 76mm APO.

When we reached the place, the Moon was setting over the water. The ashen light was clearly visible; the face of the Moon turned red only when it touched the sea. The air was very clear! We looked at M42 with a binoviewer. It was even better than last Friday. I could see six stars in Trapezium steadily at 100x, the seeing was excellent. The small APO with a nebula filter showed the Running man clearly. I looked at the Flame nebula which was pretty bright and showed considerable detail, and stowed away the binoviewer until later.

I started to go through my observing plan and looked at NGC 1999 (a small nebula around a star), 2022 (a beautiful, small and round planetary nebula) and 2158, the tiny neighbour of M35 that showed 15 stars against a beautiful nebulous background. At that moment two police vehicles arrived carrying four curious policemen. We showed them some interesting things; 'my' policeman got to see a bright planetary nebula IC 418 in Lepus (with an explaination that it was a result of a monstrous explosion) and an open cluster NGC 2169 where he recognised a '37' shape. We discussed prices of astronomy equipment and they drove away.

I proceeded to open clusters 2017 and 2129 and to the Eskimo nebula which looked better than I had ever seen. Seeing was so good that I could see a diffraction ring around the central star, and two concentric shells at 160x and 230x. Another highlight was Hubble's variable nebula that looked like a small comet with a star for a head - much better than any photo!

It was getting late and Mattias, who had a flight to Brussels to catch in the morning started to pack his equipment. I mounted my 15x70 binocular and looked at the dwarf sattellites of M31, NGC 185 and 147. This time I could see both galaxies clearly. 147 was more difficult, larger and more elongated than 185, I could only see it at times - but unmistakably. M33 was bright. I didn't spend much time with it and went to M44. The field was filled with brilliant stars, with two 'asses' at the edges of FOV. Cornucopia-shaped M67 was tight, but bright and well-resolved. M31 showed its satellites brightly and the first dust lane (abrupt edge of light, some darkness, and some tenuous light again). We looked at M81 and M82. M81 was bright with a bright central part, and M82 was bright and mottled. M51 and its companion looked like two small discs of light with bright cores. I started to recognize that the Northern skies might have some advantage over the South when it comes to galaxies, even in spite of the Magellanic clouds. (I have yet to see them to pronounce the final judgement though.)

Saturn was high at that point and I took out the binoviewer again. Meanwhile Mattias pointed the binocular at M45 and started to laugh loudly. He told me he saw nebulosity. I didn't believe and looked myself. My jaw dropped: I could see Merope nebula 'hanging down' from the bright star, and Maia nebula like a wide brush stroke. I could not see any streaks in the nebulosity, it was tenuous and infinitely delicate, but it was there! We tried California nebula, and after some staring I could see it too, across the whole field of view. This 15x70 binocluar is a marvel, it provides bright, almost wide-field-photographic views!!

We finished the session by looking at Saturn in the binoviewer at 150x. The air was very steady, with occasional waves running across the image. Cassini division was seen all along the rings, and a beautiful beige belt was seen on the globe. The eyepieces started to fog, and we packed our gear.

Dmitri

February 11, 2007 07:37 PM Forum: Deep Sky Observing

Observing in Brazil, February 2-6

Posted By Dmitri Kulginov

My trip to Paraguay was too close to full Moon to promise any good deep sky observing. I was going to spend three or four days in Brazil after that, but the weather forecasts looked so awful that I almost left my 80mm APO at home. My Brazilian friends recommended to bring a SCUBA equipment instead - because of rain. In the end I decided that I would look at Jupiter that was high enough early in the morning from the hotel and brought the telescope with me. My attempts to find an observing spot at the hotel failed. The only access to the roof was through a window and led to a roof slope. I tried to look at Jupiter from the window - only to break the frame. But I saw two belts...

I landed in Brazil on Friday evening. It was the first clear evening in weeks. Seeing was excellent, I showed to my friends Saturn (close to the Moon), Alpha Centauri (through thin clouds) and Alpha Crucis, the views were excellent. After that I looked at poor man's Sirius - Epsilon Canis Majoris - it was very easy, even though the companion could be seen only about half of the time. Rigel was no more difficult than Mizar. I looked at Sirius: in spite of a stationary diffraction ring, I could not see the companion. I felt that it was impossible with 80mm, had I glimpsed it I would not quite believe myself.

At half past five I woke up, Jupiter was high and seeing excellent. Jupiter was very different from what I saw in September: the equatorial belt is much more pronounced now and there are a lot of festoons and plumes in EZ. GRS was not visible, but I saw a dark protrusion from SEB - I identified it as South Tropical Disturbance later. Antares showed the companion preceding (seen at times).

Next evening seeing was bad, but it was clear. I was eager to finish my long-standing observing list - Karkoschka's Sky Atlas that shows about 250 deep sky objects over the whole celestial sphere. I looked at (and showed to my friends) open clusters NGC 2516 (rich, with an orange lucida noted by Herschel), 3532 (oval, rich) and 3114 (with chains of small stars), globular cluster 2808 (grainy, concentrated) and Eta Carinae that showed only little nebulosity, but was beautiful nevertheless with a lot of stars of different magnitudes and colours in clusters of different sizes around it. After that I directly compared the Southern Pleiades, IC 2606, with M45 - in the opposite parts of the sky. Both had brilliant, young white or bluish stars; there were more stars in Pleiades, but the stars were brighter in IC 2606. The dusk was not over when the Moon rose, and I could not see planetary nebula NGC 1360.

On Sunday we had churraska, a magnificent Brazilian style barbecue. It can only be found in Brazil (and reportedly in Argentina) in all its glory, Brazilian restaurants in the US do not come close. One of the guests told me that there is a public observatory nearby, http://www.observatorio.campinas.sp.gov.br . I asked him to call and check if we can go there; they were open to the public on Sunday nights! Needless to say, in the evening we were on our way.

The state-financed observatory is very impressive; there are three domes and several buildings with roll-off roofs which contain several instruments. The biggest of them are an F5 40cm Zeiss astrograph, an F11 60cm Cassegrain (both in their domes), and an F13 50cm Zeiss Cassegrain. The latter was showing the setting Venus to the public. We looked of course, but it was not very interesting. We talked to the guy in charge (his name was Orlando), and he promised to show us around after the public hours!

Meanwhile, it was getting dark (for 45 minutes only), and I set up my refractor. This time I could easily see NGC 1360 and its central star, it was best at low power. 47 Tucanae broke into star dust. Small Magellanic Cloud could not be seen by naked eye, the western sky was still too light. I found two globular clusters NGC 362 and 419 and started to scan between them and below. I saw a lot of condensations of different size and density, IC 1660 and NGC 460 no doubt among them, but I didn't have time to try to identify them. It was very exciting! I looked at the last object in my observing plan, planetary nebula NGC 3132 in Vela that was almost star-like, and Eta Carinae nebula that was much larger and richer with detail than the last time. At this point I noticed a small cloud in the night sky, sighed and packed the refractor. We went to the 50cm scope again and looked at rising Saturn. It was boiling and not much better than in 80mm. At this point I noticed the cloud again, it was at the same place, and I realized that it was Large Magellanic Cloud! I set up the refractor again and scanned it a little, spending some time with NGC 2070, Tarantula nebula. It was pretty bright and showed a hint of detail at high power, but not much more. Then we went into one of the domes and looked at M42 in the astrograph's 15cm finder.

The public started to head to the exit, Orlando came back to us and we went to the 50cm Cassegrain. Orlando suggested to point it wherever I want and showed me the clutches and fine controls. The big telescope moved very smoothly; after a few minutes I managed to point it at LMC. First I saw in the 10cm finder NGC 2048, a 'small' extragalactic nebula, and proceeded from there to the Tarantula. It was bright and big, and had a lot of loops, of which one was brightest. It was practically a photographic view, only much, much better! I changed the 25mm Plössl to my 13mm Nagler for 500x, and the view became even better - really immersive! 40mm Plössl showed some surrounding nebulosity, but the Moon was already out and 13mm worked best. After that Orlando moved the telescope to M42 where I saw six fat stars of Trapezium. I was completely happy and allowed my friends to take me to the car and drive home. Before we left, Orlando told us that he could arrange a trip to 1.6m telescope in the state of Minas Gerais - something to think about!

Next evening was partly cloudy, but it was really dark for the first time. I looked at NGC 2477 suggested by Inge, and its neighbour 2451, packed the scope and stood there for at least half an hour, looking at the Crux/Carina area with naked eye. I could see many open clusters - IC 2602 and 2391, NGC 3114 and 2516. Eta Carinae nebula was large and bright. I looked at a grazing angle at the inner spiral arm of our galaxy winding out in space. What began as a modest attempt to look at Jupiter between the clouds, had turned to a fantastic success. I have looked in 50cm Zeiss telescope at a tremendous nebula in another galaxy, and I almost finished my all-sky Karkoschka list with only two objects left - Barnard galaxy and the Coalsack.

Dmitri

March 18, 2007 03:55 PM Forum: Equipment Talk

Rings versus clamshell

Posted By Dmitri Kulginov

What is more rigid? A Takahashi clamshell or cheap rings/dovetail?

Dmitri

March 21, 2007 08:37 AM Forum: Deep Sky Observing

Another hymn to 15x70

Posted By Dmitri Kulginov

The weather had been bad all month and I was desperate, so when the forecast indicated yesterday that the night (the last dark night of March) could be not totally cloudy, I took a chance and rushed to my dark place with my 15x70 binocular. I observed only for one hour, mainly proceeding with the Messier survey with the binocular.

In the beginning the air was very transparent. Even though Orion was low, I could see, for the first time, the whole extent of nebulosity in M42 making a full circle. A photographic view, only much, much better! The milky Rosette nebula was also very clearly seen, with stars of NGC 2244 shining in the dark space in the middle.

I looked at Messier objects in Taurus, Canis Major, Puppis, Monoceros, Leo and Ursa Major, liberally mixing them with galaxies in Draco, Coma and Canes Venatici and other bright NGC objects. None of them presented any problems for the binocular. Leo triplet seen in the same field was very impressive, with 3628 clearly seen with only slightly averted vision. M81/M82 was a striking pair - M82 was bent and had a dark middle easily seen with averted vision. Normally an easy find, it took me five minutes to locate them near zenith.

Otherwise, it is so easy to find things with this binocular due to its wide field and bright views, I looked at 40+ objects in one hour and thoroughly enjoyed the process. Then a haze came and I headed home.

I think every citizen should be obliged to have a pair of high quality 15x70 by law.

Dmitri


March 25, 2007 09:17 PM Forum: Solar System Observing

Saturn - shadow or Crepe Ring?

Posted By Dmitri Kulginov

The place where the Crepe Ring used to be is very contrasty and dark this season. Is it the ring that has become better visible because of the angle it is seen at, or is it the shadow of the rings on the globe?

Dmitri

April 7, 2007 07:29 AM Forum: Equipment Talk

Russian Equatorial Mount

Posted By Dmitri Kulginov

We all know what German Equatorial Mount is. But recently, browsing a Russian astro-forum, I saw an amazing DIY equatorial mount made totally without turning. As the first picture was posted on April 1, many took it as an elaborate hoax, which it obviously is not. The mount is christened Lunar Module by its maker (for obvious reasons), is built of plywood around a huge ball bearing and some car parts, and was conceived as a project that school astronomy club could run without access to lathe.

You can see the pictures here, clicking on a picture gives a magnified version:

http://www.astronomy.ru/forum/index.php/topic,26045.80.html

Dmitri