Форум проектов ISON и LFVN
Общий раздел => Новости обсерваторий проекта => Тема начата: Игорь от Февраль 05, 2015, 00:33:58
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Comet c/2014 Q2 (Lovejoy) taken by TFRM team on Jan 9, 2015. False color composite of 5 frames stacking, each one of 60s.
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Fabra-ROA telescope at Montsec. From early satellite tracking age to space surveillance
http://astronomer.ru/data/0062/IFEMA.pdf
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Telescope Fabra ROA Montsec: a new robotic wide-field Baker-Nunn facility
http://www.acktar.com/category/telescope_fabra
The TFRM was installed at the Observatori Astronomic del Montsec (OAdM), in the Catalo- nian Pre-Pyrenees, whose WGS84 coordinates are: φ = 42◦. 0516 N, λ = 0◦. 7293 E, and h = 1570 m HMSL. To date, the OAdM is pioneered by the Consorci del Montsec, an institution run by the Catalonian Government. The observatory is located at the Montsec d’Ares mountain, 50 km South of the central Pyrenees, in the province of Lleida (Spain). The site was chosen after a site-testing campaign. The OAdM also hosts the 0.8 m Joan Or´o Telescope, named in honour of this famous Catalonian researcher.
The installation of the TFRM at OAdM resulted in a number of infrastructure upgrades to the facility as a whole: stable power line, a 100 Mbps Internet access via fiber optics cable, and enhanced security fence.
The International Scientific Optical Network (ISON) is a civilian non-governmental project devoted to space debris research and space situation awareness. TFRM is collaborating with ISON in its sistematic survey of the GEO Protected Zone since 2011 (Agapov et al. 2011). Positional measurements are derived using advanced trailed image reduction techniques included in APEX- II sofware (Devyatkin et al. 2010). As a result of this collaboration, the TFRM is one of the sensors that contributes to the completeness of the objects without Two-Line-Element data of ESA’s DISCOS database, as stated at the last “Classification of Geosynchronous Objects Report” issued by ESA (Floher 2012).
Currently TFRM is observing routinely and can detect an average of 400 GEO objects tracks per night with an accuracy better than 0′.′ 5 in both coordinates and a limit magnitude of 16 mag. Furthermore, the TFRM team is in the process of improving the limit of detection towards fainter GEO objects (Fors et al. 2010c). Typically in a 12 hour night the TFRM is measuring around 2800 positions of 320 different objects.
A good example of the TFRM’s capabilities in the SST field was the early detection after the MSG-3 (Meteosat 10) satellite launch. This GEO satellite was on its way after lifting off on an Ariane 5 at 21:36 UTC on Thursday, 5 July from Europe’s Spaceport at the Guiana Space Centre in Kourou, French Guiana. The MSG-3 was first detected by TFRM on the night of 12
July, during our routine collaboration in the ISON geosynchronous space survey. Three tracks (see Fig. 18) were detected over the night with the automatic GEO objects detection software APEX- II. With additional follow-up observations from other telescopes of ISON network, an initial orbit determination was performed by ISON before the satellite TLEs were published, and the results showed that the satellite was indeed the MSG-3, which was drifting East at 3◦ per hour rate. Hence, it was caught maneuvering to its final 0◦ longitude expected geostationary slot.
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Hi Dmitry,
after testing the TFRM's survey movements and cycle times, our best
parametes for editing the observing list are as follow:
FoV = 4.2deg (in RA) x 2.9deg (in DEC)
Exposure time = 13s
Frame to frame = 20s
Times in funtion of the number of fields per column in DEC (and the
same when column changes):
4 fields = 25s
5 fields = 26s
6 fields = 27s
7 fields = 28s
Any other movement:
40s
Have in mind that these times are not the real slewing time to one
field to another. Actually is the total optimized cycle (texp + tstop
+ tslew + tstop) with the constrait: tstop + tslew + tstop > camera
download time.
Thanks and regards,
Javier
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Оur sensor (10190) has physical constraints rather than "horizontal obstruction". Our limits are 65deg in HA (positive and
negative) and +61deg in DEC, with a lower limit in altitude of 13deg.
Our equivalent focal lenght is 479mm (apex calculated scale of 2.368 arcs/pix with a pixel of 5.5 microns)
Regards,
Javier
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Thanks Viktor, it seems that the latest changes of camera electronics are bringing us very good results! Nice!
Thanks and regards,
Lluís
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Hi Viktor,
two weeks ago the CCD shutter broke, so we had to open the telescope chage it and recolimate, not an easy maneuver with the Baker.
The night of this report there was a part of the night with many images rejected with a lot of "false" detections, so we tried to increase thsese number in order not te be rejected and see what happens. After ISON report we have been checking the images with de "unknowns" and confirmed that all of them were false detections. We think that maybe is a threshold problem, we will try to increase it and see what happens next observations.
Maybe next week we will be performing some maintenances there at the observatory.
Bests regards,
Lluís Canals
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Hey Lluis and all,
My five cents, just in case. This could be due to the difference in
FWHM, focus, and/or PSF shape in general after collimation.
Low-threshold detection is very sensitive to things like that, so
(assuming the focus is good) you might need to adjust the morphology
filtering parameters in [apex.extraction.filtering.trail_filters]. It's
the last thing to do after you make sure the images are perfect, and I
hope that you won't ever need to go that far because it's a slippery
slope, and you may easily end up in more false positives and less real
detections than before if applied without caution. I can try to help you
fine-tuning detection if nothing else helps.
Cheers,
V.K.
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https://www.acktar.com/about-us/technical-reports/telescope-fabra/
Telescope Fabra ROA Montsec: a new robotic wide-field Baker-Nunn facility
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3.2. Space debris
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The TFRM’s collaboration in the SSA/SST international effort develops in two different projects: the European Space Agency (ESA) program and the International Scientific Optical Network (ISON) survey.
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The International Scientific Optical Network (ISON) is a civilian non-governmental project devoted to space debris research and space situation awareness. TFRM is collaborating with ISON in its sistematic survey of the GEO Protected Zone since 2011 (Agapov et al. 2011). Positional measurements are derived using advanced trailed image reduction techniques included in APEX- II sofware (Devyatkin et al. 2010). As a result of this collaboration, the TFRM is one of the sensors that contributes to the completeness of the objects without Two-Line-Element data of ESA’s DISCOS database, as stated at the last “Classification of Geosynchronous Objects Report” issued by ESA (Floher 2012).
Currently TFRM is observing routinely and can detect an average of 400 GEO objects tracks per night with an accuracy better than 0′.′ 5 in both coordinates and a limit magnitude of 16 mag. Furthermore, the TFRM team is in the process of improving the limit of detection towards fainter GEO objects (Fors et al. 2010c). Typically in a 12 hour night the TFRM is measuring around 2800 positions of 320 different objects.
A good example of the TFRM’s capabilities in the SST field was the early detection after the MSG-3 (Meteosat 10) satellite launch. This GEO satellite was on its way after lifting off on an Ariane 5 at 21:36 UTC on Thursday, 5 July from Europe’s Spaceport at the Guiana Space Centre in Kourou, French Guiana. The MSG-3 was first detected by TFRM on the night of 12
July, during our routine collaboration in the ISON geosynchronous space survey. Three tracks (see Fig. 18) were detected over the night with the automatic GEO objects detection software APEX- II. With additional follow-up observations from other telescopes of ISON network, an initial orbit determination was performed by ISON before the satellite TLEs were published, and the results showed that the satellite was indeed the MSG-3, which was drifting East at 3◦ per hour rate. Hence, it was caught maneuvering to its final 0◦ longitude expected geostationary slot.
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we are in a large maintenance period until 9/10 of may. We have had troubles with the shutter (2 of them broke after a few expositions) and we are changing all the internal network and rewiring. I will contact you when we finish, but more or less it will be around the mid of may.
Best regards,
Lluís