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Nyctimene

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About Nyctimene

  • Rank
    Star Forming

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  • Website URL
    gelbhaar@googlemail.com

Profile Information

  • Gender
    Male
  • Interests
    Stargazing, music (lute, harpsichord, Early Music), reading, gardening, cooking, travelling, scuba diving, sailing
  • Location
    Germany, Odenwald
  1. Slow down, please. You are already owner of a decent 32 mmf Plössl, and I'd try out first, if it works well with your 10" scope at your given location.The magnification with the 32 mmf will be almost the same- it's just the field of view that will be more extended with the 30 mmf/2". If you are suffering from light pollution, the brightness of the sky background might reduce the contrast of certain DSO's markedly (esp. galaxies, gaseous nebulae). In this case, your eyepieces from 20 down to 10 mmf would be more suitable; just try out. Your f/5 scope will, as any fast Newtonian, suffer from coma (a comet-like distortion at the field's edges; have a look at this: http://umich.edu/~lowbrows/reflections/2007/dscobel.27.html). A coma corrector can diminish this inherent optical fault; but the degree of "coma-tolerance" seems to vary considerably from observer to observer. I for myself have no problems with coma notion when observing with my f/4 to f/5 scopes; others claim, that anything faster than f/5 needs a coma corrector for them at any rate. Hth. Stephan
  2. The first value corresponds to an "orange" zone, the second to a convenient "green" one; and the mountain top location to a very promising "blue" location, where you might put even your 35 mm eyepiece to good use - faint extended nebulae and galaxies are within your reach with an exit pupil of around 6 mm diameter (provided your dark adapted pupils open up to 6 mm, or more). I'd recommend a UHC filter as a useful addition to your equipment (perhaps a nice Christmas gift idea). 8" f/6 Dobsonians luckily are rather easy to transport by car; so enjoy your nearby dark sky areas. Stephan
  3. You will enjoy your XT 8, a very capable scope; good choice. For beginners, and in rather light polluted areas, it's best to start with easy-to-find objects, that withstand light pollution well: open clusters; bright planetary nebula, double stars. Steve's suggestion is a good starting point. Use your 25 mmf Plössl for an easy find; then play with magnifications. Above the Double Cluster is Cassiopeia with the Owl/ E.T. cluster NGC 457, and more open clusters (oc), as 663, and the fainter, but large 7789 ("Caroline's Rose"), one of my favourites. Below, the star field around Alpha Persei. Auriga, just rising, with the three Messier oc's M36, M37 and M38 (the latter in the corner of the mouth of the asterism "Cheshire Cat"). Later on, Pleiades, Hyades, M 35 in Gemini with it's small companion 2158. The Eskimo nebula, NGC 2392, a bright planetary. And, of course, Orion with it's wonders: M 42, the Orion nebula with the Trapezium stars; Sigma Orionis, a multiple star system.... Clear skies, and enjoy! Stephan
  4. Nyctimene

    Eastern Veil without filter

    Not as impressive, as it seems..... Just stumbled over this CloudyNights article; several observers spotted the Eastern Veil with 10x42 or 10x50 binos. Will give it a try with my 10x50 Zeiss Jenoptem ("Bi-zooka"-stabilized); at any rate with the Blue Penguin. But I' m afraid, that the weather will not be cooperative any more in November. Have a look: https://www.cloudynights.com/topic/635914-veil-and-binos/ Stephan
  5. Nyctimene

    Binos on a Sumerian Alkaid 12"

    Replying to FAQ's, Hofheim Instruments suggest for their 12" traveldob, to go without the transport boxes in such cases. They recommend to take the primary, well protected in bubble wrap, into the hand luggage; and to store the mechanics, again without the transport box, in a well padded hard protective case. No measurements about the dimensions given; but you might contact them; very friendly and helpful people. Stephan
  6. Nyctimene

    Binos on a Sumerian Alkaid 12"

    Hofheim Instruments offer a set of shortened tubes for their 12" f/5 traveldob, for use with a Baader binoviewer (+ correctors 1.7x or 1.25x). No bungee cords, but a additional counterweight needed; works down to 10° elevation. The price is in a similar range as the Sumerian Alkaid 12". Have a look (only German text available): http://www.hofheiminstruments.com/bino-stangen-set.html No own experience with the 12" (and of course, no affiliation etc.) Hth. Stephan
  7. Nyctimene

    Quasars

    With a 10", I'd give PG 1634+706 in Draco a try. With mags between 14.2 and 14.7 doable even with 8" under good conditions (some claim, even with a 5" frac - ?). Spotted it first in Sept 2014, and it was rather easy with the 18". Really far away with a light travel time of 8.6 Myr - light from the time, before our solar system existed; fascinating, when you look at this tiny dim point of light. Easy to find with a close pair of 8 mag stars nearby. Data and DSS finder chart attached: http://quasar.square7.ch/fqm/1634+706.html The main page of quasar.square lists more than 60 Qso's. Good luck with the hunt! Stephan
  8. Nyctimene

    Здравейте!

    Hello and welcome, Metro Id, and congrats to the very well thought-out array of scope and eyepieces. +1 for the Lumicon O III and Baader Hyperion considerations; and a thumbs up for your outreach activities! Stephan
  9. Nyctimene

    Of Toadstools and Tennis Rackets

    There are some more nice asterisms, all visible in binos: "Eddie's rollercoaster" in the north of Cassiopeia (starting near the oc Be 62); the "saxophone" in the Alpha Persei cluster; and, of course, my favourite: "Davis's Dog"; easy to find (just 2° north of the Hyades), two of it's "tail" stars are visible by naked eye, and it's unmistakable shape shows the most obvious similarity to a dog, compared to all the other way less conspicuous celestial dogs. Once spotted, you are asking yourself, why you haven't seen it before. And, guaranteed, you'll return to it each time you are visiting Pleiades and Hyades. Have a look: Enjoy! Stephan
  10. Just measured my 130 P Flextube OTA: Weight (RDF +lid included): 3090 g Overall length (with lid and collimation screws in place, but without RDF): 39,4 cm Max. diameter/width: 22cm (measured across the extension bushings) 21,5 cm (measured along the focuser axis, focuser in it's lowest position). Hth. Stephan
  11. Nyctimene

    Seeing floaters worse with higher mag.

    or by upgrading to larger apertures. With the 18" f/4.5, floaters are no issue for me, when I'm observing the moon with around 300x mag ...;-) Stephan
  12. Nyctimene

    Hi new member from malaysia

    Welcome, Jun Ping, from a German stargazer. Nice to have now three members from Malaysia on here; great country. I'd love stargazing from the tip of Borneo; must be a spectacular site. During my diving holidays at Pulau Perhentian March1993, the sky unfortunately was clouded out. Stephan
  13. Nyctimene

    Mare Imbrium

    Never came across a specific terminus for those isolated points of light in the shadowed parts of the moon. Btw., there is a "vice versa" phenomenon I've observed twice (Sept. 13th, 2016 and Apr. 4th, 2017) at the Promontorium Laplace, the eastern border point of Sinus Iridum. I spotted a deep black tiny speck of shadow (presumed in a rift) far away from the terminator, surrounded by the gleaming bright floor of S. Iridum and Mare Imbrium; slowly getting smaller - rather spectacular; and , as it seems, another speciality of Sinus Iridum (besides the "Lunar buzz-saw" phenomenon and the "Golden Handle"). Stephan
  14. Nyctimene

    Taking aim with the Blue Penguin

    Unfortunately, the Penguin works only with it's specific eyepieces, that are helically threaded (as a surrogate of a focuser). At any rate, the optional 15x (= 20 mmf) eyepiece is a must for this scope. The supplied 30x erecting eyepiece has a very narrow true field of view. Moreover, swapping between the eyepieces, with different orientations, and tracking the scope vice versa is mind-boggling. Monday morning, I did a side-to-side comparison between my trusty Vixen 80/400 FH refractor (my only scope, that has seen the Southern Skies), equipped with the Seben 8-24 zoom set at 24 mmf (=16,7x mag) and the Penguin with 15x. Details near the terminator of the hazy moon stood out well in both scopes; especially some already lit crater limbs and mountain tops in the shadowed part showed very contrasty; and the Penguin was able to keep up quite well. The same went with M 81/82 - despite moonlight and haze, they could be made out as faint smudges, but with their characteristic orientation and shape, almost equally in both scopes (the frac slightly better, but with more aperture, no obstruction, and a better eyepiece). Btw, the Penguin's 15x eyepiece is rather sensitive regarding the view - if you look into it at a slightly different angle, you have to refocus (a tiny bit). No wonder at a price of under 10€, and with a f/4 scope. But, all in all, a nice little widefield grab-and-go scope, for less than 60€ atm (from astroshop - no affiliations etc.) If you are using a Rigel and have a second base lying around, it's well worth a try. Stephan
  15. Have a look at the Skywatcher Heritage 130 P Flextube. Somewhat smaller than an 8", but very compact, versatile, easy to store, to transport and to set up; ideal, when you want to get to some dark sky areas now and then (Sark is Dark Sky Reserve). Excellent optics, decent Dob mount. and well within your price budget, leaving room e.g. for a 32 mmf Plössl eyepiece and a Baader 2,25x shorty barlow. Many positive reviews; and a lot of pleased owners on this forum (including myself). Stephan
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