Cygnus Orb-2

Cygnus CRS Orb-2

Cygnus CRS Orb-2 arriving at the ISS on 16 July 2014
Mission type	ISS resupply
Operator	Orbital Sciences
COSPAR ID	2014-039A
SATCAT no.	40084
Mission duration	34 days, 20 hours, 29 minutes
Spacecraft properties
Spacecraft	Cygnus 3
Spacecraft type	Standard Cygnus
Manufacturer	Orbital Sciences Thales Alenia Space
Payload mass	1,493.8 kg (3,293 lb)
Start of mission
Launch date	13 July 2014, 16:52:14 (2014-07-13UTC16:52:14) UTC
Rocket	Antares 120
Launch site	MARS LP-0A
Contractor	Orbital Sciences
End of mission
Disposal	Deorbited
Decay date	17 August 2014, 13:22 (2014-08-17UTC13:23) UTC
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Perigee altitude	410 km (250 mi)
Apogee altitude	418 km (260 mi)
Inclination	51.64 degrees
Period	92.85 minutes
Epoch	16 July 2014
Berthing at International Space Station
Berthing port	Harmony nadir
RMS capture	16 July 2014, 10:36 UTC
Berthing date	16 July 2014, 12:53 UTC
Unberthing date	15 August 2014, 09:14 UTC
RMS release	15 August 2014, 10:40 UTC
Time berthed	29 days, 20 hours, 21 minutes
NASA Orb-2 mission patch Commercial Resupply Services

Cygnus CRS Orb-2, also known as Orbital Sciences CRS Flight 2, was the third flight of the Orbital Sciences' unmanned resupply spacecraft Cygnus, its third flight to the International Space Station, and the fourth launch of the company's Antares launch vehicle. The mission launched from the Mid-Atlantic Regional Spaceport on 13 July 2014.

Spacecraft

Main article: Cygnus (spacecraft)

This was the second of eight scheduled flights by Orbital Sciences under the Commercial Resupply Services contract with NASA. It was the last planned usage of the enhanced Castor 30B second stage for this CRS Orb-x series.

In an Orbital Sciences tradition, the Cygnus spacecraft was named the Janice Voss after Janice E. Voss, a NASA astronaut and Orbital employee who died on 6 February 2012.

Launch and early operations

The mission was originally scheduled to launch on 1 May 2014 but the launch was delayed to no sooner than 6 May 2014, then to NET 17 June, then to NET 1 July, again to NET 10 July, again to NET 11 July due to test stand failure of an AJ-26 engine, to NET 12 July due to local weather, and finally to NET 13 July 2014, again due to weather. Orb-2 launched on 13 July 2014 at 16:52:14 UTC with berthing to the ISS following 3 days later on 16 July. The Cygnus Orb-2 delivered 1,650 kilograms (3,630 lb) of cargo to ISS and disposed of about 1,470 kilograms (3,250 lb) of trash through destructive reentry.

Mission highlights

• Flight Day 1 (Launch):After a 10-minute flight sequence, Antares launched Cygnus into orbit on the same plane as the space station, but significantly below it. Cygnus then deployed its solar arrays after separation from Antares. After a series of checks, ground controllers commanded Cygnus to begin increasing its altitude.
• Flight Days 2 & 3: Cygnus continued to increase its altitude to match that of the space station.
• Flight Day 4: NASA made a go/no-go decision for Cygnus to berth with the station whereupon Cygnus first autonomously approached within 12 metres (39 ft) below the space station, where it stopped and held position. Astronauts aboard the station then commanded Cygnus to a “free drift” mode, where they captured it with the station's robotic arm attached to the station's Nadir node.
• Flight Day 5 to Day 36: ISS Astronauts opened Cygnus’ hatch, unloaded the payload and filled it with cargo for disposal.
• Flight Day 36 through Day 41 Cygnus was detached from the station and maneuvered a safe distance away. Engineering tests were conducted for 2 days before a series of engine burns were conducted to slow the spacecraft for reentry over the South Pacific Ocean, where it and the cargo inside were destroyed.

Manifest

Total weight of cargo: 1,494 kg (3,293 lb)

• Crew supplies: 764 kg (1,684 lb)
  • Crew care packages
  • Crew provisions
  • Food
• Hardware: 355 kg (783 lb)
  • Crew health care system hardware
  • Environment control and life-support equipment
  • Electrical power system hardware
  • Extravehicular robotics equipment
  • Flight crew equipment
  • PL facility
  • Structural & mechanical equipment
  • Internal thermal control system hardware
• Science and research: 327 kg (721 lb)
  • CubeSats and deployers
  • Japan Aerospace Exploration Agency dynamic surf hardware
  • Human research program resupply
• Computer supplies: 8.2 kg (18 lb)
  • Command and data handling
  • Photo and TV equipment
• Spacewalk tools: 39 kg (87 lb)

Images

• 
  Night rollout from the Horizontal Integration Facility
• 
  Raising of the rocket into launch position
• 
  The Antares launch vehicle clears the TEL at liftoff
• 
  The launch as seen from a viewing site