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Radarvermessung von Asteroid 2004BL86 von Sternwarte Bochum/AMSAT-DL

Am 26.Januar 2015 nähert sich der Asteroid 2004BL86 bis auf ca. 1.2 Millionen km der Erde. Obwohl er mit seiner Größe von ca. 500m Durchmesser das Potential fuer grossflächige Verwüstungen bei einem Einschlag auf dem Planeten hätte, wird 2004BL86 in rund 3-facher Mond Entfernung an der Erde vorbeiziehen.

Verschiedene radioastronomische Institute werden den Asteroiden in den Tagen um die grösste Annäherung herum mit starken Radarsignalen anpeilen um so detailliertere Messungen der Grösse und Oberflächenbeschaffenheit zu erhalten.

Das starke Sendesignal des Arecibo Observatoriums auf Puerto Rico erlaubt es auch der Sternwarte Bochum zusammen mit AMSAT-DL, einen Empfangsversuch zu unternehmen.

In den frühen Morgenstunden des 27. Januar wird 2004BL86 gleichzeitig von Arecibo und Bochum sichtbar sein, so dass wir versuchen wollen ein Radarecho des Asteroiden aufzuzeichnen.

NASA/JPL-Caltech

 

Liebe Mitglieder, liebe Freunde,

bochum-mini.jpgauch in diesem Jahr findet das AMSAT-DL Symposium und unsere Jahreshauptversammlung wieder unter dem Radom der 20m-Antenne beim IUZ in Bochum statt.

Datum: Samstag, 25. Oktober 2014

Beginn: 10:00 Uhr

Ende:    16:00 Uhr

 

 

AMSAT-DL Symposium 2013

im Radom des IUZ

Blankensteiner Straße 200a

44797 Bochum

 

Zeitplan

 

10:00 - 13:00      Vorträge (siehe unten)

13:00 - 14:00      Mittagspause

14:00 - 16:00      offizieller Teil der Mitgliederversammlung AMSAT-DL e.V.

Die Tagesordnung sieht vor:

  • 1. Begrüßung
  • 2. Vorstandsbericht
  • 3. Kassenbericht und Kassenprüfbericht
  • 4. Entlastung des Vorstandes
  • 5. Aussprache und Verschiedenes

Der Vorstand freut sich über ein zahlreiches Erscheinen der Mitglieder, Gäste herzlich willkommen.

 

AMSAT-DL Satelliten Symposium

Das AMSAT-DL Symposium findet ebenfalls am 25.Oktober 2014 im IUZ, Bochum in der Zeit von 10 Uhr bis 13 Uhr statt.

10:00 -10:15
Begrüßung durch den Leiter der Sternwarte / IUZ, Thilo Elsner, DJ5YM

10:15 – 10:45
Videos Funkbetrieb über OSCAR 40 aus den Jahren 2000 bis 2003, u.a. von den Seychellen 2001,
Pazifik 2002 und AMSAT-UK , Rolf Niefind, DK2ZF

10:45- 11:15
Mit P5A zu einem Asteroid: Vorschlag eines Ersatzziels – Motivation, Vorteile, Einordnung, Wolfgang Wittholt

11:15 – 11:45
Stereo A/B Stand und Zukunft, Situationsbericht, Mario Lorenz, DL5MLO

11:45 – 12:15
ISEE- 3/ICE Kontrollübernahme und Möglichkeiten alter Raumsonden, Dr. Achim Vollhardt, DH2VA

12:15 – 12:45
Noch offen, bedarf noch der Klärung,
Michael R. Lengrüsser, DD5ER

 


 

Es'HailSat-2 will carry two geostationary “Phase 4” amateur transponders !!


As a result of a concept proposed by the Qatar Amateur Radio Society, Es’ Hailsat, the Qatar Satellite Company, have announced that their new, geostationary, Es'HailSat-2 communcations spacecraft will provide transponders for use by radio amateurs. The spacecraft is expected to be ready for launch by the end of 2016.
Es'HailSat-2 will provide a 250kHz linear transponder intended for conventional analogue operations in addition to another transponder which will have an 8MHz bandwidth. The latter transponder is intended for experimental digital modulation schemes and DVB amateur television.

Precise uplink and downlink frequencies remain to be finalized but the uplinks will be in the 2.40-2.45GHz and the downlinks in the 10.450-10.500GHz amateur satellite service allocations
Both transponders will have broad beam antennas to provide full coverage over about 1/3rd of the earth’s surface.
Precise operational plans will be finalised over the coming months but it is anticipated that only quite simple ground equipment will be required to use this satellite.

A team of amateurs, led by Peter Guelzow DB2OS (President of AMSAT-DL) are providing technical support to this ground breaking project which is expected to provide an exciting new phase of activity for radio amateurs for the 21st century.

http://www.eshailsat.qa/
https://twitter.com/eshailsat

https://www.facebook.com/EshailSat

https://www.facebook.com/amsat.deutschland

 

 


Es'HailSat-2 mit zwei geostationären "Phase 4"-Amateurfunktranspondern

Die Qatar Amateur Radio Society hat der Es’ Hailsat, der Qatar Satellite Company, ein Konzept und eine Spezifikation (*) für eine
Amateurfunknutzlast auf dem neuen geostationären Kommunikationsatelliten Es'HailSat-2 vorgestellt. Aufgrund dieser Spezifikation hat Es’ Hailsat bekanntgegeben, daß Amateurfunktransponder an Bord sein werden. Der Satellit soll Ende 2016 startbereit sein.

Es'HailSat-2 wird einen 250 kHz breiten Lineartransponder für konventionellen Analogbetrieb sowie einen 8 MHz breiten Transponder für experimentelle digitale Modulationsarten und DVB-ATV an Bord haben.

Die genauen Uplink- und Downlinkfrequenzen sind noch nicht abschließend festgelegt. Fest steht jedoch, daß der Uplink im Bereich 2,400 bis 2,450 GHz und der Downlink im Bereich 10,450 bis 10,500 GHz innerhalb der jeweiligen Amateurfunkzuweisungen liegen wird. Die Antennen beider Transponder werden große Öffnungswinkel aufweisen, so daß die maximal mögliche Fläche, d.h. ca. ein Drittel der Erdoberfläche, abgedeckt wird.

Genaue technische Parameter werden innerhalb der nächsten Monate festgelegt. Es ist zu erwarten, daß nur eine verhältnismäßig einfache Stationsausrüstung für den Betrieb über diesen Satelliten erforderlich ist.

Dieses bahnbrechende Projekt wird eine Phase neuer, spannender Amateurfunkaktivitäten auslösen. Die technische Expertise stellt ein von Peter Gülzow (DB2OS, AMSAT-DL President) geleitetes Team von Funkamateuren zur Verfügung.

http://www.eshailsat.qa/
https://twitter.com/eshailsat

https://www.facebook.com/EshailSat

https://www.facebook.com/amsat.deutschland

 

 


 

AMSAT-DL and Bochum Observatory receive signal from retired NASA spacecraft

 

On March 1st and 2nd, 2014 radio amateurs were able to detect the beacon signal from the retired NASA deep space probe ICE (International Cometary Explorer) at the Bochum Observatory (Germany). After some changes to the ground equipment and aligning the receive antenna to the predicted position in the sky, the beacon signal could positively be identified due to its frequency, the position in the sky and the frequency shift due to the radial velocity (Doppler shift).

For this detection the 20m radio telescope from the Bochum Observatory was used. In 2003, AMSAT-DL converted this former industrial monument into a fully functional groundstation for deep space probes. Since 2009 the facility is being used by volunteers almost full time as ground receive station for data from the STEREO mission with its two spaceprobes monitoring the sun from different viewing angles.

The International Sun-Earth Explorer 3 (ISEE-3) was launched in 1978 and became the first spacecraft to orbit the Earth-Sun L1 Lagrange point, measuring the interaction between the Earth's magnetic field and the Sun. It was the first spacecraft to detect the stream of particles ("solar wind") approaching Earth. In 1982, the spacecraft was renamed the "International Cometary Explorer" (ICE) and diverted to the Moon, where its gravitational pull placed ICE on a heliocentric orbit. In 1985, the comet Giacobini-Zinner was visited (the first time a comet had been encountered by a spacecraft), followed by observation of Halley’s Comet in 1986. While the instrumentation on board was still functional and fuel for more trajectory maneuvers was available, support for the ICE mission was terminated in 1997, though the spacecraft transmitter was left on. It was last detected by the NASA Deep Space Network in 2008. Its orbit however results in the spacecraft returning to Earth-Moon space in August of 2014. A small propulsive maneuver and lunar flyby could allow ICE to be directed into an Earth-Sun L1 halo orbit and perhaps resume a science mission, depending on instrument health. However in February 2014 a NASA study determined that the required resources to contact the spacecraft were not available anymore and due to budgetary constraints no further contact attempts were planned. In light of the recent observations and the available facilities in Bochum, additional studies about the economic feasibility to add a suitable uplink are being done.

We would like to thank Jeremy Bauman from KinetX Aerospace (Tempe AZ, USA) for providing the ICE trajectory solution which was essential in finding the spacecraft and Jon D. Giorgini from the Jet Propulsion Laboratory (Pasadena CA, USA) for his support.

 

ISEE-3/ICE spacecraft signal spectrum, made on 2014 Mar 02 [Sun] 1822
utc from 20m diameter antenna of Bochum Observatory, N. Germany
Range 43M km, azimuth 230°, elevation 49°.
Average of 2 spectra spanning 2.1 seconds. With a bin bandwidth of 1.6
Hz, the SNR of 15.8 dB equates to a CNR of 17.8 dB.
Indicated frequency is relative to the programmed center frequency of
2217.5 MHz of the measurement equipment.

 

 

 

 

 

 


 

About AMSAT-DL:

AMSAT-DL (short for AMSAT-Germany) is an organization consisting of engineers, scientists, students, radio amateur operators and space enthusiasts. They design, develop, build, operate and use satellites in their spare time. In addition to ca. 600 members of AMSAT-DL other national AMSAT organizations count in total about 6000 members. AMSAT-DL is one of the few space organizations which lead satellite projects from the drawing board through design stage and construction into the operative service. AMSAT-DL projects strictly follow the open-source principle so technologies and procedures can be used by third parties. This includes also lessons learned and scientific results obtained during the satellite’s operation.

About the Bochum Observatory:

The Bochum Observatory is a recognized and sponsored higher-education institution of the state Nordrhein-Westfalen (Germany) and is also funded by the ‘Landeszentrale für politische Bildung NRW’. Next to optical sky surveys the focus of the current work is the recording of earth monitoring data from satellites. The main task is the scientific analysis and the public presentation of this data to understand the function of the ‘earth system’ and to characterize the effects and risks of human actions in the context of globalization.



contact AMSAT-DL: Dr. Achim Vollhardt, mailto:Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!

contact Sternwarte Bochum: Thilo Elsner, mailto:Diese E-Mail-Adresse ist vor Spambots geschützt! Zur Anzeige muss JavaScript eingeschaltet sein!, +49 177 50 70 797

 

 


 

 

 

AMSAT-DL and Bochum observatory succeed in receiving ICE/ISEE-3

On March 1st/2nd 2014, a team of radio amateurs succeeded in receiving the beacon from the ICE/ISSE-3 spacecraft.

The 20m dish from the Bochum observatory (callsign DK0SB) was used by personnel from AMSAT-DL to detect the unmodulated carrier from ICE/ISEE-3 on 2217.493 MHz (left hand circular polarized) with an estimated signal to noise ratio of 17.8 db (bandwidth 1 Hz). Both the position in the sky and the observed doppler shift closely match the orbital elements given by JPL Horizons.

A more detailed analysis is ongoing, more tracking passes are planned.

This result was made possible by a large team of individuals of Bochum observatory/AMSAT-DL who donate their spare time to the Bochum ground station hard- and software. Special thanks go to James Miller (G3RUH), Mario Lorenz (DL5MLO) and Michael Lengruesser (DD5ER). We would like to thank Jeremy Bauman from KinetX Aerospace (Tempe AZ, USA) for providing the ICE trajectory solution which was essential in finding the spacecraft and Jon D. Giorgini from the Jet Propulsion Laboratory (Pasadena CA, USA) for his support.

 

Fast facts:

Location: Bochum, Germany

Antenna: 20m diameter, G/T 31.2 dB(1/K)

Date: 2014 Mar 02 [Sun]

Time: 1822 UT

Range: 42.8M km

Azimuth: 230°

Elevation: 49°

TX Frequency: 2217.493 MHz LHCP (Doppler corrected)

RX Antenna BW: -3 dB 0.43°, -10 dB 0.71°

Signal Strength: 17.8 dB-Hz (carrier-to-noise ratio in 1 Hz BW)

Estimated EIRP: 10 W (carrier power)

Sidebands: None observed

Receive equipment: 13cm low-noise preamplifier VLNA13 from Sam Jewell, G4DDK (www.g4ddk.com)

USRP from Ettus Research for data acquisition (www.ettus.com)

Note to ‘estimated EIRP’: the orientation of the spacecraft and hence the effective antenna gain in direction of earth is unknown. The actual spacecraft EIRP is therefore estimated with some margin for error.