Cygnus CRS Orb-2

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Cygnus CRS Orb-2
Cygnus CRS Orb-2 at ISS before grappling.jpg
Cygnus CRS Orb-2 arriving at the ISS on July 16, 2014.
Mission type ISS resupply
Operator NASA
COSPAR ID 2014-039A
SATCAT № 40084
Spacecraft properties
Spacecraft type Standard Cygnus[1]
Manufacturer Orbital Sciences
Thales Alenia Space
Start of mission
Launch date 13 July 2014, 16:52:14 (2014-07-13UTC16:52:14Z) UTC (12:52:14 EDT) [2][3]
Rocket Antares 120[1]
Launch site MARS LP-0A
Contractor Orbital Sciences
End of mission
Disposal De-orbited
Decay date 17 August 2014, 13:22 UTC (2014-08-17UTC13:23Z)
Orbital parameters
Reference system Geocentric
Regime Low Earth
Perigee 410 kilometres (250 mi)[4]
Apogee 418 kilometres (260 mi)[4]
Inclination 51.64 degrees[4]
Period 92.85 minutes
Epoch 16 July 2014
Berthing at ISS
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
Mass 1,493.8 kg (3,293 lb)

Cygnus Orb-2 Mission Emblem.jpg

← Cygnus CRS Orb-1 Cygnus CRS Orb-3

Cygnus CRS Orb-2,[5] also known as Orbital Sciences CRS Flight 2, is 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 July 13, 2014.


Main article: Cygnus (spacecraft)

This is the second of eight scheduled flights by Orbital Sciences under the Commercial Resupply Services contract with NASA. This is 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 has been named the Janice Voss after Janice E. Voss, a NASA astronaut and Orbital employee who died on February 6, 2012.[6]

Launch and early operations[edit]

The mission was scheduled to launch on May 1, 2014.[2] The launch was delayed to no sooner than May 6, 2014, then to NET June 17, then to NET July 1, again to NET July 10, again to NET July 11 due to test stand failure of an AJ-26 engine, to NET July 12 due to local weather, and finally to NET July 13, 2014, again due to weather.[3] Orb-2 berthing to the ISS will follow about 3 days later on July 15.[7] The Cygnus is expected to deliver 1,650 kilograms (3,630 lb) of cargo to ISS and dispose of about 1,470 kilograms (3,250 lb) of trash through destructive reentry.[8]

Mission highlights[edit]

  • Flight Day 1 (Launch):After a 10-minute flight sequence, Antares will launch Cygnus into orbit on the same plane as the space station, but significantly below it. Cygnus will deploy its solar arrays after separation from Antares. After a series of checks, ground controllers will command Cygnus to begin increasing its altitude.
  • Flight Days 2 & 3: Cygnus will continue to increase its altitude to match that of the space station.
  • Flight Day 4: NASA will make a go/no-go decision for Cygnus to berth with the station. Cygnus will first autonomously approach within 12 metres (39 ft) below the space station, where it will stop and hold. Astronauts aboard the station will then command Cygnus to a “free drift” mode, where they will then capture it with the station's robotic arm attached to the station's Nadir node.
  • Flight Day 5 to Day 36: ISS Astronauts will open Cygnus’ hatch, unload the payload and fill it with disposal cargo.
  • Flight Day 36 through Day 41 Cygnus will be detached from the station and maneuvered a safe distance away. Engineering tests may be conducted for up to 15 days before a series of engine burns are conducted to slow the spacecraft for reentry over the South Pacific Ocean, where it and the cargo inside will be destroyed.[4]


Total weight of cargo: 3,293 pounds (1,494 kg)[4][9]

  • Crew supplies: 1,684 pounds (764 kg)
    • Crew care packages
    • Crew provisions
    • Food
  • Hardware: 783 pounds (355 kg)
    • 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: 721 pounds (327 kg)
    • CubeSats and deployers
    • Japan Aerospace Exploration Agency dynamic surf hardware
    • Human research program resupply
  • Computer supplies: 18 pounds (8.2 kg)
    • Command and data handling
    • Photo and TV equipment
  • Spacewalk tools: 87 pounds (39 kg)



  1. ^ a b Bergin, Chris (2012-02-22). "Space industry giants Orbital upbeat ahead of Antares debut". NasaSpaceflight (not affiliated with NASA). Retrieved 29 March 2012. 
  2. ^ a b "Worldwide launch schedule". Retrieved 29 May 2014. 
  3. ^ a b "ISS Commercial Resupply Services Mission (Orb-2)". Orbital Sciences. 
  4. ^ a b c d e "ORBITAL-2 MISSION TO THE INTERNATIONAL SPACE STATION Media Press Kit" (PDF). NASAdate=July 2014. 2014. 
  5. ^
  6. ^ Rawcliffe, Britt (July 11, 2014). "After delays, Orbital Sciences Corporation's Antares rocket set to launch". Spaceflight Insider. Retrieved July 11, 2014. 
  7. ^ Stephen Clark (22 May 2014). "Antares rocket engine damaged in test mishap". Spaceflight Now. Retrieved 29 May 2014. 
  8. ^ Beneski, Barron (1 October 2012). "Orbital Begins Antares Rocket Operations at Mid-Atlantic Regional Spaceport". Orbital Sciences. Retrieved 2 October 2012. 
  9. ^ Garner, Rob. "Orb-2 Science Briefing Highlights".