ВНИМАНИЕ! На форуме началось голосование в конкурсе - астрофотография месяца ИЮЛЬ-АВГУСТ!
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Алексей, Вы всё перевели и поняли правильно. Смысловой перевод: <...>
Задача пока ставится куда проще: подтвердить или опровергнуть наблюдения Данхэма, т.е. увидеть постепенное изменение блеска яркой покрываемой звезды с большим угловым диаметром.
Понятно, что правильно настроенное видеооборудование ценой в несколько тысяч $, при корректной обработке даст научно значимый результат в виде интерферограммы покрытия.
есть у меня DOS-программка из известной книжки Пфлегера, позволяющая рассчитать доступные покрытия звёзд до 7.5m из Зодиакального каталога на любой разумный период. Нужны координаты места наблюдения и даты "от" и "до". Заинтересует, пришлите данные по e-mail, рассчитаю.
Не рекомендую Вам для расчёта касательных покрытий пользоваться "DOS-программками из известных книжек".
В первом приближении хотелось бы знать географические зоны покрытий Альдебарана и Антареса на период 2009-2020 гг.
У Олега Угольникова ("Небо начала века" 2001-2012) ещё отмечено покрытие a Sco 21.10.2009.
Если к покрытиям 2009 г. будут точные координаты полосы касательного покрытия, думаю, всё-таки надо попробовать.
Алексей, огромное Вам спасибо за проделанный труд - это именно то, ради чего создавалась тема!
Опыт у нас уже есть, отсалось только за счёт ВАГО jps-ку купить
В России сейчас подобными наблюдениями не интересуются, а западные методики ещё найти и перевести надо. Или на прямой контакт с Дэвидом Данхемом выходить...
На 10 мая(тем более это выходной), можно совершить и экспедцию, в южные области России с палатками и небольшими телескопами. Опыт у нас уже есть, отсалось только за счёт ВАГО jps-ку купить
The messages provide information in the following circumstances:If a dark-limb occultation occurs less than 20" from the terminator, the distance to the terminator, and to a theoretical 3" high mountain beyond the terminator which could be sunlit, is given.If there is a grazing occultation of the star nearby. The distances used to indicate whether a graze-nearby message should be generated are set in the ‘Options / Set Output & other options’ – for temporary changes, and under ‘Options / Edit values in Defaults file’. The message gives the latitude of the graze path at the longitude of the prediction site, the change of that latitude with a change in longitude (+'ve to the East), and the cusp angle of the graze.
Next is information used for generating the graze profile. The meaning of the several columns is:CASSINI REGION GRAZE A message line that is produced if the graze occurs in the Cassini region of the moon. Librations the latitude and longitude librations, and the P, D librations. (Explanation)Illumination of Moon the % illumination of the moon (as for ordinary occultations)Elongation of Moon the elongation of the moon (as for ordinary occultations)Vertical Profile Scale a figure which represents the distance on the Earth's surface of 1 arc sec at the mean distance of the moon.Horizontal Scale Factor a figure which represents the change in position angle of the star for a change in 1 minute in time, at the time of mid-graze.There follows a table of limiting magnitudes, which gives a computed limiting magnitude for a range of telescope apertures and cusp angles (centred on the cusp angle at mid-graze). This table indicates the size of telescope needed to observe the graze. [NOTE: Under certain circumstances, the visibility table takes a considerable time to compute.]
Graze ProfileA graze prediction includes a lunar profile. On screen, you can swap between the path prediction, graze profile, and graze map, using the Windows toolbar at the bottom of the screen.The information shown on the profile is:• the mean limb of the moon - shown as continuous when illuminated, widely-spaced dots when dark;• the terminator (if present) – shown as continuous;• the lunar profile. • If the profile is cyan/continuous, it is reliable; • If it is magenta/short dashes, it is somewhat unreliable;• If it is red/long dashes, it is quite unreliable – the profile should be treated as being unknown, and potentially several arc-sec different from that indicated; • If it is green, it is based on past observed grazes in the Cassini region. The northern region is generally reliable. The southern region is reliable for P=-5 to -6; it is less reliable for P=-2 to –4.• Observations from past grazes can be plotted against the predicted profile, with Observed graze data… (Details).• a legend for the 4 different profile lines.• the time scale, in minutes;• the distance scale, perpendicular to the graze path, in km or miles (The default value is km. Change to miles under the menu item With profile… Show distances in miles, not km);• a scale line for 1 arc sec, and 1 degree in PA; and• information identifying the star, date, and longitude used for the profile prediction. [Note that the profile is generated for the LAST position on the computed graze path.]• Optionally, the time, and distance from the smooth-limb limit, at the location of the cursor can be shown as a tool-tip, with the menu item With profile… Show time and distance at cursor.The plot of the profile includes the corrections to the Watts charts determined by Morrison & Appleby MNRAS (1981) 196, 1013 – as a correction to the profile height above the mean limb. The profile deduced from past grazes is independent of the datum used for the Watts charts (and thus is not subject to these corrections.)The grazes used to plot past observations against the predicted profile the profile can be listed from With profile… Display grazes used. This identifies grazes by year, month day, and star number. It also gives the l and b librations for the graze. The list can be sorted by any of date, star number, l libration, and b librations – under the menu option With graze list… that is on the form displaying the list of past grazes. Similarly the list can be copied to the clipboard, or printed.If the cursor is placed on an observation, the date, UT (h, m, s), event type, reported reliability, name of the observer, and star number, are displayed at the top left of the form.. The coding used is:Event codings:DD DB DU - disappearance at the Dark limb / Bright limb / in UmbraRD RB RU - reappearance at the Dark limb / Bright limb / in UmbraBL FL Mi - Blink / Flash / MissReliability codings: “ok” = certain, “?” = possibly spurious; “??” = almost certainly spurious[The display of the event details is NOT included if the profile is printed.]
От: Dave HeraldКому: "PlanOccult" <planoccult@aula.com>Написано: 11 декабря 2007 г., 19:09:49Тема: [IOTAoccultations] Bi-centennial grazing occultationI've been doing some follow-up investigations of the first grazing occultation observed. Turns out that the first 'true' grazing occultation was observed by D Koch in Danzig [now Gdansk, Poland]. It was a northern-limit graze of Aldebaran, observed on 1794 Mar 7, at around 19h 24m UT. Koch observed 5 events. D, R 10 secs later, D after another 4 or 5 secs, then a rapid R and D sequence. Koch then watched for about 30 secs before taking his eye away from the scope to write down what he saw. When he looked back, the star had reappeared. Koch clearly understood that the events were caused by valleys on the edge of the moon.Out of curiosity I had a look to see if anyone had observed a 'bicentennial' graze. And the answer is yes! Peter Skilton (of Victoria, Australia) observed a graze of XZ27528 on 1994 March 7, at around 18h 29m - just 55 minutes short of 200 years from the first grazing occultation observed. A belated congrats to Peter!Dave HeraldCanberra, Australia
От: David DunhamКому: IOTAoccultations@yahoogroups.comНаписано: 11 декабря 2007 г., 09:06:26Тема: [IOTAoccultations] Grazing occultation maps for 2008 Eberhard Riedel's maps of lunar grazing occultations during 2008 are now posted at http://iota.jhuapl.edu/grazemap.htm (or directly at http://iota.jhuapl.edu/grazmp08.htm ), including the best grazes of stars and planets of mag. 3.0 and brighter worldwide, and to fainter magnitudes (more events) for eastern Australia, Europe, and North America (southern Canada, the 48 contiguous U.S. States, northern Mexico, Bahamas, and most of Cuba). There was a problem generating the maps and data for New Zealand; we hope to be able to post those soon. Also to be posted later will be maps and information about grazes during the lunar eclipses in February and August. Besides the maps and index table for the maps, detailed path data and circumstances are given at 1-deg. intervals for all of the events, as well as some links to Web sites with GoogleMaps interfaces allowing very detailed plotting of some of the paths. David
Коллеги, подниму тему за неделю до покрытия Антареса Луной. Как показали расчёты А.Лосюка, наибольшие шансы у наблюдателей в южных регионах страны.
Тоже наблюдал только открытие. Луна находилась очень низко над горизонтом+ облака иногда налетали на Луну. Сначало показалось что это освещёная врхушка лунной горы, но потом увидел что это Антарес выходит из за лунного диска.