Dictionary

Ablative

Material which burns away to dissipate heat



ACS

Attitude Control System

Controls roll and pitch



AFB

Air Force Base



AFTS

Autonomous Flight Termination System

An improved, automated version of FTS



AOS

Acquisition of Signal



Aphelion

Highest point in an orbit around the Sun



Apoapsis

Highest point in an orbit



Apogee

Highest point in an orbit around Earth



ASDS

Autonomous Spaceport Drone Ship



ASOG

A Shortfall of Gravitas

An additional landing ship under construction



BEAM

Bigelow Expandable Activity Module



BECO

Booster Engine Cut-Off



BEO

Beyond Earth Orbit



BFB

Big Falcon Booster

Boost stage for the conceptual Big Falcon Rocket



BFR

Big Falcon Rocket

Conceptual heavy launch vehicle by SpaceX, renamed to Starship in Nov 2018



BFS

Big Falcon Spaceship

Crew version of the upper stage for the conceptual Big Falcon Rocket



BFT

Big Falcon Tanker

Refuelling version of the upper stage for the Big Falcon Rocket



BO

Blue Origin

Jeff Who?



CCAFS

Cape Canaveral Air Force Station



CF

Carbon Fiber / Fibre



COPV

Composite Overwrapped Pressure Vessel



COTS

Commercial Orbital Transportation Services



CRS

Commercial Resupply Services

Contract with NASA for ISS resupplies



Cryogenic

Liquids below -150 °C (-238 °F)



DoD

(US) Department of Defense



DPL

Downrange Propulsive Landing



DSN

Deep Space Network



ESA

European Space Agency



EVA

Extra-Vehicular Activity



F1

SpaceX Falcon 1 (obsolete medium-lift vehicle)



F9

Falcon 9 launch vehicle

Partially reusable TSTO medium-lift launch vehicle developed by SpaceX



F9 B5

Falcon 9 Block 5

Falcon 9 Block 5 is the fifth version of the Falcon 9 Full Thrust.



F9 FT

Falcon 9 Full Thrust

v1.2 of the Falcon 9 rocket



FAA

Federal Aviation Administration



FCC

Federal Communications Commission



FOD

Foreign Object Damage



FRR

Flight Readiness Review



FTS

Flight Termination System



GEO

Geostationary Earth Orbit

Earth orbit at 35786km



GOX

Gaseous Oxygen



Grid-fin

Aerodynamic control surface used during landing of the Falcon booster.



GSE

Ground Support Equipment



GSO

Geosynchronous Orbit

Any Earth orbit with a 24-hour period



GTO

Geosynchronous Transfer Orbit



H1

First half of the year/month



H2

Molecular hydrogen



H2

Second half of the year/month



HCO

Heliocentric Orbit

Orbit around the sun. Earth is in a Heliocentric orbit



HEEO

Highly Elliptical Earth Orbit

Earth orbits with an apogee higher than 35780km



HEO

High Earth Orbit

Earth orbits higher than 35780km



HIF

Horizontal Integration Facility



Hypergolic

Two substances (typically liquids) that ignite on contact with each other



IDA

International Docking Adapter



Isp

Specific impulse

Total impulse (or change in momentum) delivered per unit of propellant consumed



ISRU

In-Situ Resource Utilization



ISS

International Space Station



ITAR

(US) International Traffic in Arms Regulations



ITS

Interplanetary Transport System

The 2016, 12m booster "Mars Rocket", since revised - See BFR



IVA

Intra-Vehicular Activity



JAXA

Japan Aerospace eXploration Agency



JPL

Jet Propulsion Lab



JRTI

Just Read The Instructions



Kerolox

Kerosene/liquid oxygen



KOS

Keep Out Sphere

200m radius from ISS



KSC

Kennedy Space Center, Florida



KSP

Kerbal Space Program

The place where countless hours of my life vanished forever



L1

Lagrange Point

Inline through the center and between two large celestial bodies, where the gravitational pull of one body is exactly equal to that of the body's orbital period.



L2

Lagrange Point

Inline through the center of two large celestial bodies, where the point is located beyond the smaller of the two. Here, the centrifugal force is balanced.



L3

Lagrange Point

Inline through the center of two large celestial bodies, where the point is located beyond the larger of the two.



L4

Lagrange Point

On the third angle of an equilateral triangle, from the center of the two large celestial bodies.



L5

Lagrange Point

On the third angle of an equilateral triangle, from the center of the two large celestial bodies.



Lagrange Point

Points near two large orbiting celestial bodies.

At a LP, the gravitational and centrifugal force of the two large bodies balance each other. Excellent location for placement of satellites.



LAS

Launch Abort System



LC-13

Launch Complex 13 (Cape Canaveral)

Now Landing Zone 1



LC-39A

Launch Complex 39A (Kennedy Space Center)



LCH4

Liquid Methane



LEO

Low Earth Orbit

Earth orbits between 180-2000km



LES

Launch Escape System



LIDAR

Light Detection and Ranging



Lithobrake

"Braking" by impacting the ground



LN2

Liquid Nitrogen



LNG

Liquefied Natural Gas



LOS

Loss of Signal



LOS

Line of Sight



LOX

Liquid Oxygen



LV

Launch Vehicle



LZ-1

Landing Zone 1, Cape Canaveral (LC-13)



LZ-2

Second landing pad adjacent to LZ-1



M1A

Merlin 1 kerolox rocket engine, original (2006), 340kN



M1B

Merlin 1 kerolox rocket engine, revision B (unflown), 360kN



M1C

Merlin 1 kerolox rocket engine, revision C (2008), 556-660kN



M1D

Merlin 1 kerolox rocket engine, revision D (2013), 620-690kN, uprated to 730 then 845kN



M1DVac

Merlin 1 kerolox rocket engine, revision D (2013), vacuum optimized, 934kN



MaxQ

Maximum aerodynamic pressure

The point in flight at which the aerodynamic stresses are highest



MECO

Main Engine Cut-Off



MEO

Medium Earth Orbit

Earth orbits between 2000-35780km



MET

Mission Elapsed Time



Methalox

Portmanteau: methane/liquid oxygen mixture



Milspec

Military Specification



MLLV

Medium Lift Launch Vehicle (2-20 tons to LEO)



MLV

Medium Lift Launch Vehicle (2-20 tons to LEO)



MMH

Mono-Methyl Hydrazine, HCH3N=NH2; part of NTO/MMH hypergolic mix



Monopropellant

Rocket propellant that requires no oxidizer (eg. hydrazine)



Multi

Multiple Landings

For Falcon Heavy missions landing badge, multiple landings occur. In the near future this will be removed in favour of showing individual core landing info.



MVac

Merlin 1 kerolox rocket engine, revision D (2013), vacuum optimized, 934kN



NDA

Non-Disclosure Agreement



NET

No Earlier Than



NOTAM

Notice to Airmen



NRO

(US) National Reconnaissance Office



NROL

(US) National Reconnaissance Office Launch

Random sequence of numbers for a launch for the NRO.



NSF

NasaSpaceFlight forum



NTO

diNitrogen TetrOxide, N2O4; part of NTO/MMH hypergolic mix



Ocean

Ocean Landing

An ocean landing is performed to test conditions too risky for a drone ship landing, or when a booster (before block 5) is not able to fly more than twice so doesn't need to be recovered.



OCISLY

Of Course I Still Love You

East coast landing platform / drone ship



PAF

Payload Attach Fitting



PAS

Payload Adapter System



Periapsis

Lowest point in an orbit



Perigee

Lowest point in an orbit around the Earth



Perihelion

Lowest point in an orbit around the sun



PICA-X

Phenolic Impregnated-Carbon Ablative heatshield compound, as modified by SpaceX



PLF

Payload Fairing



Polar

Polar Orbit

An orbit that passes over Earths polar regions



PPF

SpaceX Payload Processing Facility (Cape Canaveral)



Pyrophoric

A substance which ignites spontaneously on contact with air



QA

Quality Assurance



Raptor

Methane-fueled rocket engine



RCS

Reaction Control System



Regenerative

A method for cooling a rocket engine, by passing the cryogenic fuel through channels in the bell or chamber wall



Retro-propulsion

Thrust opposite to the current direction of travel



Reused

Flight Proven

The component, usually the booster stage, has already experienced a full flight and should therefore be considered more reliable than a brand new component (conditions very much apply!)



RP-1

Rocket Propellant 1

Highly refined kerosene



RSS

Rotating Service Structure



RTF

Return to Flight



RTLS

Return to Launch Site



RUD

Rapid Unplanned/Unscheduled/Unintended Disassembly



RUD

Rapid Unscheduled Disassembly



Scrub

Launch postponement for any reason



SECO

Second-stage Engine Cut-Off



SF

Static Fire



SLC-40

Space Launch Complex 40, Cape Canaveral



SLC-4E

Space Launch Complex 4-East, Vandenberg



SLC-4W

Space Launch Complex 4-West, Vandenberg



SLS

Space Launch System



SNC

Sierra Nevada Corporation



SOX

Solid Oxygen

Not desirable, part of the cause of the AMOS-6 anomaly



SRB

Solid Rocket Booster



SSO

Sun-Synchronous Orbit



SSRP

Supersonic Retro-Propulsion

Thrust opposite to the current direction of travel, while travelling faster than the speed of sound



SSTO

Single Stage to Orbit



STA

Structural Test Article





Starship

Starship launch vehicle

Fully reusable, two-stage-to-orbit super heavy-lift launch vehicle under development by SpaceX. First publicized as BFR, later renamed to Starship.



Suborbital

A trajectory that doesn't complete an orbit



TE

Transporter/Erector



TEA-TEB

Triethylaluminium-Triethylboron

A pyrophoric mixture used as an ignition fluid for Merlin engines



TEI

Trans-Earth Injection maneuver



TEL

Transporter/Erector/Launcher



TLI

Trans-Lunar Injection



TMI

Trans-Mars Injection



TSM

Tail Service Mast, holding lines/cables for servicing a rocket first stage on the pad



TSTO

Two Stage to Orbit



Turbopump

A turbine-driven propellant pump connected to the engines combustion chamber. Raises chamber pressure and therefore thrust



TVC

Thrust Vector Control



TWR

Thrust-to-Weight Ratio



UDMH

Unsymmetrical dimethylhydrazine

A liquid hypergolic propellant



UHF

Ultra-High Frequency radio



ULA

United Launch Alliance (Lockheed/Boeing joint venture)



USAF

United States Air Force



USSF

US Space Force



VAB

Vehicle Assembly Building



VSFB

Vandenberg Space Force Base, California

Renamed in May 2021 from Air Force Base



WDR

Wet Dress Rehearsal