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MINUTES of the RadioAstron Teleconference on October 10, 2011

Yu.Yu. Kovalev chaired the teleconference. The agenda of the teleconference and the list of participants are attached to the Minutes. 1. N. Kardashev and M.Popov informed the participants on the current IOC results. Cross scans by the SRT on Cas A have been done in all frequency ranges, and preliminary analysis proved that the whole receiver system parameters are in a reasonable agreement with the specifications. M.Popov also mentioned some malfunctions of service system such as thermal regulation of SRT antenna. He presented a plan of future IOC experiments such as observations of the Moon and Jupiter. M.Popov emphasized that the main task is to establish communication link between the SRT and Pushchino tracking station. 2. E. Fomalont provided information on VLBA survey of potential fringe finders. The observations of about 20 radio sources have been conducted, and data reduction will take about three weeks. K.Kellermann express his concern to finish processing in shorter period to provide time for scheduling of future space-ground observations. 3. M. Popov made further explanation on the rules of selection of compact extragalactic sources located close to the orbit plane and in the permitted area relative to the Sun. Some of these sources (like BL Lac 0016+731, 0212+735, 0738+313) will be in the very favorable position providing for some period of time space-ground baseline projections shorter than those for ground telescopes. Table of time slots suitable for observations of such sources is ready and will be sent to the observatories after final selection based on the results of the VLBA survey. However, it was recommended to distribute the table of potential time slots between the observatories as soon as possible. 4. Yu.Yu. Kovalev informed the participants on the activities in preparing scientific proposals to get observing time at ground radio telescopes in support of RadioAstron ESP. There are three working groups on AGN, pulsars, and cosmic masers, coordinated by Y.Y. Kovalev, M.Popov and A.Alakoz. During last few weeks several proposals are being prepared for the Arecibo, EVN and Effelsberg. Kovalev also reported an important news that several observatories agreed to support RadioAstron IOC and ESP programs (QUASAR network in Russia, Evpatoria 70-m dish in Ukraine, Medicina radio telescope in Italy, and Yebes RT in Spain). Participation of radio telescope in Usuda is under negotiations. Kovalev invited new members to participate in the development and future realization of the RadioAstron ESP. 5. A. Lobanov reported on his activities in understanding of data formats of documents issued by the Ballistic Center and containing orbital parameters necessary for tracking and correlation. He made translation of the documents into English. The documents may be utilized by software correlators outside of Russia. J.Romney asked question about up-down link phase loop and implementation of such mode at the correaltor. Kovalev and Popov made clarification that main mode of space-ground interferometer operation will use on-board hydrogen maser as the source of reference frequency.


L.Gurvits asked for clarification on the planned sequence of tests with establishing up-down link and first fringe search observations. He was answered that fringe search with the on-board H-maser standard will be conducted first. N.Kardashev told about negative decision of the head of NASA Mr. Bolden on the request from the head of ROSKOSMOS Mr. Popovkin to provide funding for the Green Bank tracking station. Kardashev said that he will try to get necessary funding from the ROSKOSMOS now. Status of affair on creating tracking station in South Africa is very positive. Formal inter government agreement has been signed. The matter is to solve technical details of the implementation of the Russian equipment at the 30-m radio telescope. 6. Review of action items · · · E.Fomalont: to initiate recovering of VLBA+Italy survey (to contact the schedulers) (closed) E.Fomalont and J.Romney: To provide some review of problems happened with fringe search in VSOP project. (closed) M.Popov: To compose a tentative time-table of possible observations, and inform the observatories on the specific time slots that might be requested for fringe search program in October-November. (continued) C. Gwinn: to try to compile FAKERAT software on modern platforms. (closed) GBT and Arecibo: to test communication lines for raw data transfer to the ASC correlator (continued to Y.Y. Kovalev) ASC administration: to prepare necessary agreements with Russian Custom Service for hard disks shipment. (in progress)

· · ·

7. Next teleconference to be held in November of 2011 year. Yu.Yu. Kovalev raised an issue on the restructuring the teleconference in the connection with the operational status of the mission. He suggested to circulate a request for present list of participants asking about their willing to take active part in mission operations. There was a discussion on the time and necessity for the general Radioastron Review Meeting in Russia suggested by Kardashev to be held in June 2012 in Pushchino. However, there were opinions that in June only the first scientific results will be known, and more suitable time would be October-November. Nevertheless in June it would be reasonable to organize RISC meeting.

Agenda of the RadioAstron teleconference October 10, 2011 Corrections to the Agenda
1 2

N.Kardashev N. Kardashev/M.Popov E.Fomalont M.Popov

IOC status and results VLBA observations to find best fringe search candidates Fringe search plan

3


4 5 6 7 8 9 10

Early science program Correlator supporting data Tracking stations outside Russia List of action items Restructuring future telecons Radioastron meeting in Pushchino in 2012 Next teleconference

Y.Y.Kovalev/M.Popov/A.Alakoz A. Lobanov N.Kardashev/S.Likhachev M.Popov Y.Y.Kovalev N.Kardashev N.Kardashev

List of participants: Asaki Y. Baan W. Bartel N. Booth R. Cannon N. Fomalont E. Giovannini G. Gurvits L. Gwinn C. Hagiwara Y. Jauncey D. Kardashev N. Karen O'Neil Kellermann K. Kogan L. Kostenko V.I. Kovalev Y.Y. Langston G. Lobanov A. Minter A. Mori M. Murata Y. Popov M. Romney J. Salter C. JAXA, Japan Astron, The Netherlands York Univ., Canada Onsala, Sweden York Univ., Canada NRAO USA IRA/INAF, Italy JIVE, The Netherlands California University, USA NAO, Japan CSIRO, Australia ASC, Russia GBT, USA NRAO, USA NRAO, USA ASC, Russia ASC, Russia NRAO, USA MPIfR, Germany GBT, USA GBT, USA JAXA, Japan ASC, Russia NRAO, USA NAIC, USA