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Re[11]: Kosmicheskii teleskop "Habbl"
12.08.2007 5:22 | R. G. Chertanov
Soglashus', Vy pravy, pri malen'kom zerkale umen'shaetsya uglovoe razreshenie (ya sputal s drugoi harakteristikoi). No naprimer na etom snimke Yupitera v vidimyh i UF-luchah rezko razlichaetsya kachestvo. http://hubblesite.org/newscenter/archive/releases/1994/31/image/a/format/web_print/ A tochno li u etih snimkov odinakovoe, kak Vy pishete, uglovoe razreshenie? >""Nepoladka", tochnee, prisutstvie korrektiruyushego fil'tra, proyavlyaetsya v umen'shenii effektivnoi ploshadi, a ne uhudshenii uglovogo razresheniya". Mozhet tam i effektivnaya ploshad', i uglovoe razreshenie imenno dlya UF-diapazona sootvetstvuyut zerkalu men'shemu, chem zayavleno? Inache by ne bylo takoi zhutkoi zernistosti na vtorom snimke, ne tak li. Da i kstati ne dolzhen li ul'trafiolet uluchshit' eto samoe uglovoe razreshenie (chem koroche dlina volny, tem ved' luchshe razreshenie). A na snimkah my vidim naoborot rezkoe uhudshenie pri yakoby tom zhe zerkale. Soglasites', chto zdes' yavno chto-to ne tak. Versiya pro ustanovlennyi astronavtami korrektiruyushii fil'tr, kotoryi im tam vse uhudshil, konechno, interesnaya, no ona trebuet bolee podrobnyh svedenii, a ih-to kak raz i net. Chto soboi predstavlyaet eta shtuka, pochemu ona uhudshila imenno UF-diapazon - my ved' ne znaem. Ili u Vas est' polnaya yasnost' na etot schet? Kstati predstav'te proceduru ustanovki korrektiruyushego fil'tra - eto zhe sverhtochnyi pribor, a u kosmonavta perchatki edva gnutsya. Oni ne sumeli sdelat' shtatno, pol'zuyas' vsemi priborami, na Zemle, no yakoby u nih vse poluchilos' v kosmose. Da i esli neudacha postigla s odnim habblom, pochemu ne zapustili vtoroi, ispravnyi (ved' rashody na NIOKR, kotorye s'edayut l'vinuyu dolyu sredstv, uzhe byli poneseny). Ne inache kak zdes' chto-to ne tak: odna otmazka NASA gromozditsya na druguyu, i v itoge my imeem te zhe snimki, kotorye sdelal by i vozdushnyi shar BLAST... Naschet vozmozhnosti poddelki PSF - na fone takogo uhudsheniya snimka lyubaya komp'yuternaya obrabotka vneset, mne kazhetsya, ne slishkom zametnye iskazheniya. Da i pikselyam yarkost' podkorrektirovat' po snyatym eshe na zemle harakteristikam - po-moemu eto neslozhno.
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