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Forum: Commercial Space - Military Space
Topic: Orbital Sciences Antares-Cygus COTS demo flight

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Message to Edit: HTML is ON UBB Code is ON Smilies Legend	Originally posted by Robert Pearlman on 09-21-2013 01:27 PM Orbital Sciences update <blockquote><font size="+0">[b]Cygnus COTS Demonstration Status[/b]</font> <div align="justify">Before Cygnus can rendezvous and berth with the International Space Station (ISS), it must perform several thruster firings to raise its orbit and catch up with the ISS. Cygnus must also perform 10 maneuvers to demonstrate the safety capabilities of the Cygnus. Once each demonstration maneuver is complete, Orbital will send a data package to NASA for review to verify that the demonstration has met its objectives. Since the launch of the spacecraft at 10:58 a.m. on Wednesday, September 18, the Cygnus team has been busy completing the first two of 10 required in-orbit demonstrations and has successfully conducted four Delta V burns to raise Cygnus' orbit. On Friday (Sept. 20), the team conducted Delta V burn no. 4 to raise Cygnus' orbit to within 4 km of the ISS orbit altitude. If needed, an additional burn may be conducted in Saturday, September 21, to "fine tune" Cygnus' orbit. The Cygnus team is busiest on Sunday, September 22, the day of rendezvous, grapple and berthing with the ISS. That day, the remaining eight demonstrations and a series of smaller Approach Delta Velocity (ADV) burns will be carried out prior to capture by the station crew and berthing with the ISS. Once the final demonstration maneuver is deemed successful, NASA will give approval for the approach to within 10 meters of the station where Cygnus will be grappled by the robotic arm and guided to its berthing port.</div> <center><table width="100%" border="0" cellpadding="5" cellspacing="0"><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Completed</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Free drift and abort demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Demonstrate the spacecraft's ability to float freely with all of its thrusters inhibited and to safely move away from the station if necessary</font></td></tr><tr bgcolor="#333333"><td width="15%" valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td width="35%" valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Position and attitude control demonstration</font></td><td width="50%" valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Test the spacecraft's ability to hold its position</font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Relative GPS navigation demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Verify the spacecraft's GPS-based navigation system is operating as expected</font></td></tr><tr bgcolor="#333333"><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Onboard targeting demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Confirm the spacecraft's ability to maneuver to a targeted position in space</font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif"> </font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">ADV 1</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Raises Cygnus from 4 km below ISS to 1.4 km</font></td></tr><tr bgcolor="#333333"><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Reaction Engine Assembly (REA) maneuver demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Demonstrate Cygnus' attitude control system's ability to maneuver </font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif"> </font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">ADV 2</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Moves Cygnus closer to R-Bar (directly below the ISS)</font></td></tr><tr bgcolor="#333333"><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Hardware Command Panel (HCP) checkout</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Verify that the ISS crew can command Cygnus using the HCP aboard the Station</font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif"> </font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">ADV 3</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Positions Cygnus to intersect the R-Bar </font></td></tr><tr bgcolor="#333333"><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">LIDAR navigation demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Confirm that Cygnus' laser navigation sensor's position and velocity data is accurate and as expected in prefight simulations</font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif"> </font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">ADV 4</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Continues Cygnus' ascent on the R-Bar toward 250m</font></td></tr><tr bgcolor="#333333"><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">ADV 5</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Continues Cygnus ascent up the R-bar</font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Retreat demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Verify that the ISS crew can command Cygnus to retreat away from the ISS, if needed</font></td></tr><tr bgcolor="#333333"><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Hold demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Verify that the ISS crew can command Cygnus to hold during approach, if needed</font></td></tr><tr><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">9/22</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">LIDAR single reflector tracking demonstration</font></td><td valign="top"><font size="-2" color="#CCCCCC" face="sans-serif">Demonstrates Cygnus' LIDAR's capability to focus on a single reflector on the ISS</font></td></tr></table></center></BLOCKQUOTE> <a name="092213a"></a>
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