[Stanescu Octavian]

Doru: eu nu astept elogii sau comentarii de admiratie , astept si realizarile altora , observatii , poze , tehnici folosite .
Dar se pare ca e suptire aici pe forum prezenta celor ce fac , sunt multi spectatori foarte indiferenti dar critici.
O atmosfera tipic romaneasca regasita in parlament , partide , tabere de smecheri...

[zoth]

[Mircea Pteancu]

dxdx347 a pus intrebarea daca are sanse sa vada urma recentului impact al cometei cu Jupiter.Iata mai jos un raport de observatie venit din partea lui Thomas Jensen din Danemarca .Thomas a observat urma impactului cu luneta sa Vixen 80mm F/15,luneta despre care Thomas vorbeste la superlativ si ,diafragmata la 60mm F/20 ,o considera chiar mai buna decat luneta Telemator.
Asa ca stimate dxdx347,eu zic sa insisti,mai ales daca stii ca oglinzile tale sunt de buna calitate,sunt curate,telescopul este bine colimat si ca vei folosi oculare Plossl de calitate sau,si mai bine,orthoscopice.Asa cum a facut si Thomas,care are un ''harem'' de lunete de inalta calitate dar la planete si duble foloseste oculare ortho,nu cred ca nu si-ar permite oculare mai ''sofisticate'' ;si chiar si lunetele de 60mm le pune pe EQ5.
Ba mai mult dxdx347,incearca oricum,in cel mai rau caz nu vei reusi sa vezi urma impactului.Dar daca vei reusi....

Felicitari tuturor celor care au reusit sa observe fenomenul,succes tuturor celor care vor incerca.Pentru aceia nerabdatori sa revina la obisnuita galceava romaneasca,am subliniat pasajul ref. strict la topic,poate insa ca pentru unii si restul va fi o lectura placuta.Mircea
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Hi friends

Unless you've been hiding under a fairly large rock on a remote island recently, you have no doubt heard about the recent comet impact on Jupiter. Strangely, it happened EXACTLY 15 years after the last one, Shoemaker-levy 9 in 1994.

Anyway, I was writing on a story last night but stopped around 1.00 AM to go to bed, when I noticed it was clear outside. Very clear. Jupiter shone brilliantly quite high in the SE. I immediately set my Vixen 80/1200 out to cool.

Unfortunately, the seeing was not very good, though there were OK moments.

At 133x (9mm KK ortho) Jupiter was nice, bright and large in the eyepiece. The moons had positioned themselves almost symmetrically in two pairs, one pair on each side of Jupiter, though one pair was a bit closer to Jupiter than the other. Actually, my first view of Jupiter was at 300x (4mm KK ortho), as I had accidentally grabbed the wrong eyepiece. I was frankly stunned by the level of visible detail visible in a fraction of a second when the seeing steadied. But the seeing wouldn't allow continued use of this eyepiece, so I dropped down to the 9mm.

The GRS was quite well visible, mostly as an "eyebrow" above its hollow in the SEB(S). The NEB was quite rough around the edges and sported numerous ill-defined darker spots, hinting at great detail, if just the seeing had been up to it.

I began looking for the impact scar, but couldn't detect anything unusual. I did not know the transit time for it, though, so I was just observing on chance alone. After a while I concluded I couldn't see anything, at least yet, so I turned to some other targets.

First was M57. Oh, how nice this one is in a 80mm! Especially at high power. I centered it in my 32mm plössl (38x) and then used the 9mm KK to get a closer look. With some effort, I could detect the 13th mag star close to it, but it was difficult. I enjoyed the sight of the nebula for a while.

M27 was next. Easily sweeped up at 38x and a marvellous sight at that power, a puff of smoke, sitting in a field strewn with many faint pinpoint stars on a velvet background.

The seeing high overhead was far better than down where Jupiter resided, so I aimed the 80mm at Vega. Mostly to do a nerdy startest, but also to spot the companion. Well, the 80mm has some spherical abberation, but the companion was well seen at 133x and 300x. I then stopped the scope to 60mm and looked again. When stopped to a 60mm f/20, this scope has one of the best star tests I've seen. The views are remarkably sharp. And Vega's companion was easily visible at 300x. I went back to M57, to see if I could detect the 13th mag star with the scope stopped to 60mm, but I couldn't. Not tonight.

But it split Delta Cygni, even better than the Zeiss Telemator does. The view at 300x was exquisite for a 60mm. The companion was a very faint and difficult dot on the diffraction ring of the main star, but it was unquestionably there. I opened the aperture to 80mm and now the companion was obvious, but the sharpness degraded quite a bit.

I returned to Jupiter. The seeing was still poor, but I sat down and stared at it anyway. Once in a while, good detail could be seen. I again experimented with stopping the scope to a 60mm f/20 and was startled to find that the level of detail dropped far less than I would have thought at first. The color correction was far superior to that of my Telemator. One day, I need to do a super shootout between the Telemator, The E60 and the 80/1200 stopped to a 60mm f/20.

Still, the 80mm offered more light and detail when left at full aperture, so I sat down with it at 133x and looked. By now the GRS had crept closer to the limb, so a new part of Jupiter had rotated into view. I began to study the southern polar region intensely. I noticed subtle shading in it and hints of belts, but no spot.

Until I began to get hints of something near the limb. At first, I dismissed it, but it stubbornly returned once in a while, when the seeing improved. I studied it intensely, but it was very vague. It did seem to get more and more obvious, however, indicating that it was indeed something that was rotating into view. At the best moments it seemed to be a tiny, elongated spot, darker than the surroundings. Had the seeing been very good, it would no doubt have stood out better. Still, I wasn't convinced it was the impact scar, and now heavy clouds rolled in. Typical! It was now 2.25 AM, so I quickly packed up and went to bed.

The next morning (OK, forenoon!) I checked the various websites I check every day, and found several links to images of the impact spot. I then began to get excited, because some of them were close to what I had been seeing and there was a small dark spot in exactly the right location! This one comes very close:

http://spaceweather .com/submissions /large_image_ popup.php? image_name= Joel-Warren- 0330impact1_ 1248356046. jpg

Imagine it without the Callisto shadow and with the GRS a little bit closer to the center of Jupiter and the impact spot a little closer to the limb. And much more difficult, of course.

This excellent drawing shows how subtle it is visually:

http://spaceweather .com/submissions /large_image_ popup.php? image_name= Jeremy-Perez- img2009072301_ JupiterImpactlg_ 1248350220. jpg

I am now very excited about having made this observation. The impact scar is far fainter than those in 1994, but I am very happy that I have seen both events. This is the kind of event that makes it so uber cool to be an amateur astronomer. Imagine, I have seen an impact scar on a planet many millions of miles from earth. It's sci-fi stuff!

One every 15 years. I will be ready in 2024!

Thomas, Denmark

[Mircea Pteancu]

Off-topic
Prin postarea observatiei lui Thomas Jensen nu doresc sa contrazic nimic din cele afirmate de dragos.n,cele spuse de el fac parte din ''convingerile'' mele instrumentale.
O coincidenta interesanta este aspectul similar al telescopului lui ''bird'',descoperitorul urmei impactului,cu cel al telescopului lui Alan Chu,autorul lui ''Photografic Moon book''.Ambele instrumente au oglinzi primare Royce,si asemanarile nu se opresc aici.Inafara de aspectul telescoapleor, este si faptul ca nu au venit pe lume degeaba.
La noi in tara,prin anii '30 Ioan Zaidel a descoperit cu un telescop de constructie proprie o asemenea formatiune pe Saturn (daca-mi amintesc bine,am pe undeva scrisoarea lui).
Mircea

[Cristian Monea]

Dupa ce am pus intrebarea nu am mai asteptat raspunsul pe forum si am trecut la fapte , dar nu am reusit sa vad urma impactului (probabil ca era pe cealalta fata a planetei), desi am prins conditii de observare mai bune decat de obicei. Acum sunt nori si n-am decat sa astept vreme mai buna. Nu dispun de oculare Plossl sau orthoscopice, dar incerc sa ma descurc cu cele primite cu telescopul .

[zoth]

Alte observatii ale urmei impactului folosind refractoare cu deschiderea 55-100 mm pe CloudyNights:
http://www.cloudynights.com/ubbthreads/sho...t/all/vc/1

[Stanescu Octavian]

Ma gandeam ca vom arta aici mai mult relizari personale si nu iar aceiasi placa de patefon cu ce au facut altii si cu instrumentele cele mai mici posibile .

poate gasiti daca mai scormoniti Netul pe cineva ce vede pata si cu binoclu sau cu ochiul liber

[zoth]

Aratam aici tot ce se poate arata
Impactul de pe Jupiter nu este un eveniment national sau unul dedicat special astronomy.ro
Mesajul adaugat de mine mai sus vine sa sustina ideea (subliniata si de Mircea) ca observarea acestui fenomen nu este doar apanajul celor ce au in dotare instrumente mamut.
Rautatile tale nu prea isi au rostul.
Personal inca nu am avut posibilitatea sa fac observatii dedicate acestui eveniment, dar sper sa se iveasca cat mai repede.

[Stanescu Octavian]

Vorbesc totusi de pe o pozitie funamental diferita ,fiind printre cei cativa din tara ce au vazut fenomenul , si poate printre cei doi ce au fotografiat fenomenul. Dar de fapt in Romania se cam amesteca valorile

[mak]

Ca sa poti vedea urma impactului, ai nevoie de mai multe lucruri: atmosfera "ingaduitoare", un instrument de observatie capabil sa observe asemenea detalii, pozitie favorabila a lui Jupiter si, nu in ultimul rand, timp disponibil pentru asa ceva. Toate astea trebuie sa se intample concomitent.

Eu am iesit vineri seara cu telescopul (SC de 8 inci) la observatii, sperand sa prind si urma impactului, care ar fi trebuit sa apara pe la 4 dimineata (la 2 ore si 16 min. dupa Pata Rosie). Intre 22.30 si 01.30 am facut observatii deep-sky si stele duble; pe urma am trecut la planete. Am vazut Pata Rosie pe Jupiter si Neptun si Uranus.
Pe la 02.30 m-am decis sa strang tot si sa ma culc (mai ales ca la 6 dimineata trebuia sa fiu in picioare) pentru ca mi-a fost foarte clar ca nu voi putea observa urma de impact in acele conditii (pe Jupiter vedeam doar doua benzi si Pata Rosie fara prea multe alte detalii; altfel zis, pe Jupiter l-am vazut mai bine de atat in alte dati).

Ce vreau sa zic prin toata "proza" asta: daca nimeni nu scrie comentarii pe forum (luati in calcul ca postul e din week-end), nu inseamna ca in tara asta sunt doar doi oameni care incearca sa vada impactul. Eu n-am scris nimic pana acum pentru ca n-am cu ce ma "lauda" si consider deci ca aportul meu tinde la zero (daca as fi vazut ceva, as fi comentat despre aspect, pozitie etc.). Mi se pare fara rost sa ma bag in discutie doar ca sa fac zgomot.

Legat de lipsa de reactie, eu am observat ceva: de vreo doua saptamani, activitatea pe forum a scazut, deci poate fi si asta o cauza.

Si inca ceva, si cu asta inchei: de cate ori am scris ceva pe forum, am scris fie sa pun intrebari legate de ceva ce nu intelegeam fie sa scriu impresii care sper eu sa ajute pe altcineva. Mi se pare "aiurea" (n-am gasit alta rima) sa postezi ceva pe forum doar ca sa primesti laude sau aprecieri (prin asta nu insinuez ca cineva ar fi facut asa ceva).

Felicitari pentru observatii pentru cei care au reusit sa vada impactul, nu atat pentru instrumentele capabile, cat pentru "incapatanarea" de a-l vedea. Din pacate, pana acum, aportul meu se reduce doar la asta.

[theogon]

Eu i-aş felicita pe cei care au reuşit să vadă impactul şi pentru pasiune, dar şi pentru instrumentul dobândit (muncit) cu trudă.
O replică dintr-o piesă spunea aşa : istoria este făcută de ţările mari, cele mici doar o discută.
Aşa şi noi pe aici: unii astronomi amatori chiar fac observaţii, amatorii de astronomie (printre care cu onoare mă număr) doar discută...

[Cristian Monea]

[Doru Dragan]

http://www.mikesalway.com.au/2009/07/20/br...on-jupiter
Lucrurile sunt cat se poate de simple. Spre deosebire de mine si altii ca mine care suntem vorbareti , Tavi Stanescu nu e chiar asa. Eu am vreo 3300 mesaje postate el are vreo 800 desi m-am inscris pe forum cu vreo luna mai devreme (m-am straduit un pic sa-l fac sa se inscrie ) si asta nu pentru ca nu ar avea ce spune Acuma ... asta nu inseamna ca nu e si el om si ca pe orice om il bucura niste mesaje care arata interes pentru munca lui, incurajare si poate chiar laude. Pe de o parte omul s-a straduit sa-si faca niste instrumente dar nu e numai asta. Jupiter si cu pata lui nu se vad oricand. Pozele au fost facute la niste ore imposibile (pentru cei mai multi dintre noi), pe la 1-2 dimineata. Sa faci efortul asta, sa vrei sa impartasesti realizarile cu cei care (presupui) au aceleasi pasiuni ca tine si sa constati ca se lasa o tacere de mormant ... e un pic cam neplacut

[Cristian Monea]

Va multumesc! Acum stiu exact cand trebuie sa ma uit dupa urma impactului Wesley (ca asa l-au denumit acum).

[auriga]

eu unul citesc (aproape) toate mesajele de pe forum, dar nu sunt foarte vorbaret. Felicitari dl. Stanescu si Timosca pt. observatii. Sincer acelasi lucru as fi vrut sa-l fac si eu, dar nu au fost indepliniti multi dintre factorii amintiti de @mak. am reusit doar observatii cu refractor 60mm de pe balcon, dar am vazut putine detalii. Newton-ul zace cam decolimat deocamdata (m-am impotmolit la centrarea secundarei sub focuser).
p.s.
cautand despre racirea oglinzilor am dat de site-ul lui anthony wesley (http://acquerra.com.au/astro/cooling/). Nu a fost o intamplare sa gaseasca impactul