Форум проектов ISON и LFVN
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Автор Тема: Про нас пишут и наши интервью  (Прочитано 266888 раз)
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« : 04 Апрель 2008, 00:28:25 »

Программа "Авиатор" брала интервью у Агапова (возможно даже про нашу сеть будет пара слов) и у Иванова (начальник ЦУП ЦНИИМАШ) - готовят передачу про космический мусор, в предверии 12 апреля
« Последнее редактирование: 22 Январь 2014, 15:51:03 от Игорь » Записан
 
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« Ответ #736 : 29 Сентябрь 2019, 21:36:54 »

Дима, 2 фото, что ты добавил, а убрал, были абстрактные- телескоп вообще непонятно чей, а укрытие - из Благовещенска. Это они в предыдущей новости тиснули, поскольку реальных фото не было.

А сейчас впервые именно реальные фото
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« Ответ #737 : 06 Октябрь 2019, 03:27:29 »

https://www.projectpluto.com/temp/mpec.htm

"Pseudo-MPEC" for 2019 OK = S511618 = asassn3

This object was initially found by SONEAR in Brazil, with a short arc of three observations, not enough to tell us much except that it had to be close to us. They posted the data as a new object on the NEOCP under their designation, S511618.

Shortly afterward, the ASAS-SN (All-Sky Automated Survey for Supernovae) found a moving object in their images, and posted the data to NEOCP with the designation asassn3. Things were a little confused here. As the name indicates, ASAS-SN focusses on supernovae (and finds a lot of variable stars and some galactic novae). Their data were posted as having come from the observatory codes (711) McDonald Observatory in Texas and (F65) Faulkes Telescope North in Haleakalā, Hawaii, but were not from the telescopes actually at those locations; the ASAS-SN telescopes share domes there. The data were posted to the Possible Comet Confirmation Page even though the object wasn't at all a possible comet. Supernova surveying can be done with large pixels and poor astrometry, but when we see 5" residuals from (711) and (F65), we're usually thinking "bad data".

Neither arc, by itself, looked all that unusual. Put together, they fit into an orbit that would pass us at about 71000 +/- 1000 km in a mere four hours. (The orbital elements after collecting all the data gave a perigee distance of 71359.03 +/- 2.33 km from the center of the earth.)

However, I didn't realize the (711) and (F65) data were actually from ASAS-SN. If I had, the large residuals would have been to be expected; they aren't asteroid astrometry folks. I thought the data were coming from the "usual" McDonald and FTN scopes; coming from them, the data looked suspiciously bad.

So I took the possibility that S511618 and asassn3 were the same object with a big grain of salt. It seemed likely to me that the (711) and (F65) data were just wrong. But I posted a request on MPML for observations on the theory that the best way to find out if the linkage was real was to look for the object in the place you'd expect to see it. (Which would be a relatively small area of sky with a very bright object.)

Very shortly after I posted that request, (F51) PanSTARRS went through their archives and realized they had some data for the object, which firmed up the orbit tremendously and confirmed that the linkage was real. I got an e-mail explaining the situation for the ASAS-SN data from (711) and (F65), so that mystery went away. The object was rather low on the horizon as seen from Europe, but two ISON stations were able to track them (it probably helped that these objects were really bright, as NEOs go.)

We now have radar data for this object from Arecibo, which (as often happens with radar) really firms up the orbit. The Doppler (radial velocity) measurement fits to within 1.2 sigmas; the ranging data fit almost exactly. (Though the radar guys tend to lowball their uncertainties. I really ought to adjust them by about a factor of three to get them to match the sigmas given to optical data.)

If you look at the along-track/cross-track residuals, you'll see some systematic timing errors near perigee, of the sort that often crop up with fast-movers. I'm hoping the stations involved will check their timing by observing GPS/navigation satellites. If they do, and if their timing is reasonably consistent ("hmmm, our clocks are off by -5.4 seconds, and were probably off by the same amount when we observed 2019 OK"), then we should be able to recompute the orbit using corrected times. I hope.
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« Ответ #738 : 12 Октябрь 2019, 17:50:26 »

Статья Шустова Б.М. "О роли науки в изучении и парировании космических угроз":

http://www.inasan.ru/wp-content/uploads/2019/10/Статья-о-космических-угрозах-Вестник-РАН.pdf

На стр. 781:

Следует  отметить  существенный,  причём на протяжении многих лет, вклад в наблюдения большой академической сети ISON (International Scientific Optical Network), поддерживаемой ИПМ им. М. В. Келдыша РАН, которая предназначена в основном для регистрации космического мусора с помощью телескопов класса 50 – 70 см. Значительная часть базы данных космического мусора ИПМ РАН основана на наблюдениях сети ISON, особенно наблюдений объектов в зоне геостационарной орбиты. Иллюстрацией может служить мгновенный снимок распределения КМ в ОКП (рис.  2).  Хорошо  выделяются  сгущения  КМ на низких орбитах и в области геосинхронных орбит. Важной особенностью сети ISON является её широкое распространение по планете.

На стр. 785:

Российские учёные и специалисты участвуют в международной кооперации по обнаружению ОНТ, но, к сожалению, вклад наших наземных средств – обсерваторий и сетей ISON и МАСТЕР (МГУ им. М. В. Ломоносова) – пока весьма скромен и не превышает 0,1 % от общего числа открытий АСЗ.

Рис. 2.  Распределение объектов космического мусора в ОКП, построенное по данным базы данных
ИПМ РАН на момент 24.06.2016 12:13:19 UTC


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« Ответ #739 : 12 Октябрь 2019, 21:05:30 »

http://www.astro.sk/caosp/Eedition/FullTexts/vol49no2/pp307-319.pdf

Small telescopes and their application in space debris research and space surveillance tracking

2.2. The International scientific optical network

The largest civilian network performing the SST function is the International scientific optical network (ISON) operated by the Keldych Institute of Applied Mathematics, Russian Academy of Sciences, Russia. There are more than three dozen of observation facilities worldwide contributing to the ISON network. ISON is continuously increasing its coverage and currently contains 90 telescopes with apertures in range from 0.125 m to 2.6 m (Mokhnatkin et al., 2017). A majority of the telescopes’ operators are from academic institutions. ISON focuses on the cataloguing and research of objects on higher orbits and Near Earth Asteroids (NEA). Three ISON telescopes, a 64-cm AT-64 (a), a 2.6-m ZTSh in Nauchniy-1 (b) and a new 50-cm VT-40/500 in Ussuriysk (c) are shown in Fig. 2. The 2.6-m ZTSh telescope, situated in Nauchny, is the telescope with the largest aperture from all sensors contributing to ISON.

The geographic distribution of the ISON telescopes and its cooperating telescopes as to 2017 are plotted in Fig. 3. Most of the ISON telescopes are situated in the Russian Federation but are continuously deployed to other locations such as South and North America, Australia and Africa.
...

4. Summary

Space surveillance of space debris is essential for space operations safety and long-term sustainability. Surveillance networks such as USSTRATCOM and the Russian ISON are widely using optical sensors/telescopes, which discover new objects and maintain their own catalogues. Both systems’ data is publicly available and largely used by different subjects, from governmental entities and space agencies to academic researchers.

Small optical telescopes play a crucial role in space debris research and space surveillance tracking. Their role in space safety will increase in the next few years due to the large privatization of the space industry, which will bring new challenges like the mega-constellation projects.

References

Mokhnatkin, A., and 6 colleagues, Performance analysis of the large space debris tracking telescope in the north Caucas after the second first light, 2017, Proceedings of 7th European Conference on Space Debris, Darmstadt, Germany, 17 April 2017 - 21 April 2017.

Molotov, I., and 7 colleagues, Current status of the ISON optical network, 2014, 40th COSPAR Scientific Assembly, held 2-10 August 2014, in Moscow, Russia, Abstract id. PEDAS.1-3-14.

Figure 2. Examples of ISON telescopes for the faint fragment observations: a 64-cm AT-64 (a) and a 2.6-m ZTSh in Nauchniy (b) and a new 50-cm VT-40/500 in Ussuriysk (c) (Molotov et al., 2014).

Figure 3. Geographical distribution of sensors participating to the ISON (Mokhnatkin et al., 2017).


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