Space-track throttles API use in order to maintain consistent performance for all users. To avoid error messages, please limit your query frequency.
|CDM||3 / day||Once every 8 hours for all constellation Conjunction Data Messages (CDM)|
|CDM||1 / hour||Once every hour for a specific conjunction event (Note: The CSpOC will continue to send Close Approach (CA) emails to satellite owners/operators)|
|TLE||1 / hour||Once every hour for TLEs. Please randomly choose a minute for this query that is not at the top or bottom of the hour.|
|SATCAT||1 / day||Once per day after 1700 (UTC) for SATCAT data|
|BOXSCORE||1 / day||Once per day after 1700 (UTC) for Box Score data|
|60-DAY DECAY||1 / week||Once per week, on Wednesdays after 1700 (UTC), for 60-Day Decay data|
With great power comes great responsibility...
The API Query Builder tool allows users a great amount of power and flexibility in creating queries. Your space-track account may be suspended if you violate the usage policy by querying data too often or by running queries that negatively impact the performance of the website. Repeat offenders may have their account suspended permanently.
If your account has been suspended you should receive instructions from us on what you need to do in order to have your account re-instated.
We're here to help...
We realize that it can sometimes be challenging using our API to craft the correct query to retrieve the data that you're looking for. Rest assured that we're here to help you! If you Contact Us and tell us what you are trying to accomplish, we can help you customize your queries to meet your needs.
For further information on orbital mechanics see: link
|AKM||Apogee Kick Motor|
|DoD||Department of Defense|
|GMT||Greenwich Mean Time|
|JFSCC||Joint Force Space Component Command|
|MM||Month or Minutes|
|PKM||Perigee Kick Motor|
|RCS||Radar Cross Section|
|SSA||Space Situational Awareness|
|TBA||"To Be Announced" in the future.|
|TBD||"To Be Determined" or unknown|
|TIP||Tracking and Impact Prediction|
|TLE||Two Line Element set|
|USG||United States Government|
|USSTRATCOM||United States Strategic Command|
ISS (ZARYA) 1 25544U 98067A 04236.56031392 .00020137 00000-0 16538-3 0 9993 2 25544 51.6335 344.7760 0007976 126.2523 325.9359 15.70406856328906 ---------------------------------------------------------------------- 1234567890123456789012345678901234567890123456789012345678901234567890 reference number line 1 2 3 4 5 6 7
|1-24||ISS (ZARYA)||The common name for the object based on information from the Satellite Catalog.|
|3-7||25544||Satellite Catalog Number|
|19-32||04236.56031392||Element Set Epoch (UTC) *Note: spaces are acceptable in columns 21 & 22|
|34-43||.00020137||1st Derivative of the Mean Motion with respect to Time|
|45-52||00000-0||2nd Derivative of the Mean Motion with respect to Time (decimal point assumed)|
|54-61||16538-3||B* Drag Term|
|63||0||Element Set Type|
|3-7||25544||Satellite Catalog Number|
|9-16||51.6335||Orbit Inclination (degrees)|
|18-25||344.7760||Right Ascension of Ascending Node (degrees)|
|27-33||0007976||Eccentricity (decimal point assumed)|
|35-42||126.2523||Argument of Perigee (degrees)|
|44-51||325.9359||Mean Anomaly (degrees)|
|53-63||15.70406856||Mean Motion (revolutions/day)|
|64-68||32890||Revolution Number at Epoch|
The security classification of the element set. All objects on this site will have a classification of 'U' (unclassified).
This is another format for identifying an object.
"+", "-" or " " (space) are acceptable in the 34th character position on Line 1, and indicate positive or negative value for 1st Derivative of the Mean Motion. A space implies a positive value.
The checksum is the sum of all characters in the data line, modulo 10. In this formula, the following non-numeric characters are assigned the indicated values:
As the United States government agency responsible for Space Situational Awareness (SSA) information, U.S. Strategic Command (USSTRATCOM), is committed to promoting a safe, stable, sustainable, and secure space environment through SSA information sharing. As more countries, companies, and non-governmental organizations field space capabilities and benefit from the use of space systems, it is in our collective interest to act responsibly and to enhance overall spaceflight safety. To achieve effective SSA, USSTRATCOM seeks to increase cooperation and collaboration with partners and space-faring entities through the exchange of SSA data and provision of SSA services.
The Joint Force Space Component Command (JFSCC) provides SSA services through this website and their operations center, the Combined Space Operations Center (CSpOC), located at Vandenberg Air Force Base, California. There are three levels of SSA services: basic, emergency, and advanced.
USSTRATCOM provides space surveillance data to registered users through this public website, www.space-track.org. The CSpOC routinely updates the website with positional data on more than 16,000 satellites in orbit around the Earth. Users can build customized API queries to pull specific data from historical records, and automate the retrieval of new data.Available CSpOC products:
Redistribution of basic SSA information retrieved from Space-Track.org requires an approved Orbital Data Request. Redistribution includes, but is not limited to, the use of Space-Track.org data to support public websites, web applications, software programs, written publications, and any other means of sharing Space-Track.org data with the general public.Available CSpOC products:
Anomaly Resolution consists of actions taken by an owner/operator in response to a launch or on-orbit anomaly or non-nominal condition affecting a spacecraft bus, telemetry subsystem or communications payload, onboard sensor(s), or any other operating payload or subsystem.Available CSpOC products:
On-Orbit Conjuction Assessment (CA) is the process for determining the point and time of closest approach of two tracked orbiting objects. The CSpOC screens all active satellites against the satellite catalog several times per day to identify close approaches. If a close approach meets emergency reportable criteria the CSpOC will notify the satellite's owner/operator by email and through Space-Track.org's Operator Panel. This service is provided at no cost to promote spaceflight safety, and does not require an SSA Sharing Agreement or an ODR.Available CSpOC products:
If an owner/operator receives a close approach notification email from the CSpOC, the owner/operator may submit their proposed maneuver plan and ephemeris for screening against the space catalog. Results that meet emergency reportable criteria will be provided. Collision avoidance is the responsibility of the owner/operator, but the CSpOC will support their collision avoidance efforts by screening their ephemeris and providing results through the predicted time of closest approach.Available CSpOC products:
Launch Conjunction Assessment (CA) identifies potential conjunctions that may result in a collision between launching objects and on-orbit objects. Using information provided by the customer prior to launch, via the Form 22 , the CSpOC screens the launch vehicle against the space catalog and provides conjunction information for each associated launch time. Screening begins at an altitude of 150km or greater and continues until either location uncertainty makes performing the screening no longer feasible or until the rocket body/sub-orbital components descend to 150km or less. The Launch CA Screening Results identify periods during the launch window which may put the rocket and payload at increased risk for collision.Available CSpOC products:
Early Orbit Determination (EODET) is the process by which USSTRATCOM assets track a launch and/or separation of an object in order to generate element sets, catalog, and identify the object(s). In the event of launch anomalies (such as a booster failure, a launch failure, a satellite achieving the incorrect orbit, etc.), the CSpOC may provide anomaly resolution support.Available CSpOC products:
Early Orbit Conjunction Assessment (CA) includes the screening of owner/operator-provided ephemeris against the satellite catalog to facilitate the safe maneuvering of a newly launched object into its final orbit. Expanded screening volumes and propagation are used to identify possible close approaches. Operators may provide more than one ephemeris file for each maneuver to allow analysis of multiple scenarios.Available CSpOC products:
Advanced On-Orbit CA uses expanded screening volumes and propagation to provide more results than Basic Emergency CA.Available CSpOC products:
Advanced Collision Avoidance may be provided to assist owners/operators in relocating a satellite, or to avoid self-identified close approaches. Both situations allow an owner/operator to submit maneuver and non-maneuver ephemeris for expanded screening against the satellite catalog.Available CSpOC products:
Disposal/End-of-Life Support consists of planning for proper upper stage disposal and spacecraft end-of-life operations. If provided maneuver planning and on-orbit Information, the CSpOC may support a satellite owner/operator’s plans for disposing of an object by providing conjunction assessment and collision avoidance support using expanded screening volumes and propagation.Available CSpOC products:
Deorbit and Reentry Support includes reentry assessment, reentry confirmation, and assistance in deorbit operations. Reentry assessments are predictions of the time and location where an uncontrolled object will reenter the atmosphere (not where the object will impact the ground). If a satellite owner/operator decides to perform the controlled deorbit of a satellite or rocket stage and provides relevant on-orbit information, the CSpOC will provide related conjunction assessment and collision avoidance support using expanded screening volumes and propagation, and confirmation of reentry after the owner/operator’s deorbit procedures are performed.Available CSpOC products:
All customers (non-U.S. government, commercial, and USG) should request advanced services using the Orbital Data Request (ODR) form. To submit an ODR, follow the directions on page 1 of the form and send it to firstname.lastname@example.org.
The CSpOC’s SSA Sharing Cell processes all requests, which undergo security, legal, and resource assessments before the final CSpOC authority approves or disapproves the request. In the event of disapproval, the SSA Sharing Cell will work with the customer to revise their request for reconsideration. If a request is approved by the CSpOC, but the customer does not have an SSA Sharing Agreement, the request will be forwarded to USSTRATCOM for further review.
After approval, the SSA Sharing Cell will provide an estimate of when the data will be delivered, or when the ongoing service will be initiated. In some situations this will take more time than others, but the customer will be notified accordingly. ODRs are valid for one year from the date of approval.
Customers may request information not included in standard services, but this will lengthen the review process and the time required to deliver the data or service, if the request is approved.
Whether you are putting your first satellite on orbit, or adding to an existing constellation, we encourage you to register your asset with the CSpOC so that we can plan for optimal tracking and identification, and provide you with conjunction assessment services as soon as possible. To register, please email email@example.com with the following information:Required:
As soon as you register, a member of the CSpOC will contact you to discuss the details of your mission and coordinate conjunction assessment and other required support.
Due to the dynamic nature of space operations, the CSpOC relies on information from operators, launching agencies, and the overall space community to maintain space situational awareness. Even if you do not require direct support from the CSpOC, we welcome the following information:
Maintaining spaceflight safety and space situational awareness is a cooperative activity and responsibility. The information you provide advances these goals and ensures equal access to space for all global users. If you have questions about USSTRATCOM services or suggestions on how we can improve any aspect of our SSA Sharing process, we encourage you to contact the SSA Sharing Cell at firstname.lastname@example.org.
USG entities and their contractors may be eligible to receive additional data and services not listed above depending on their mission requirements and security clearance. For more information, please email email@example.com.
CSpOC SSA Sharing Cell
Please direct all initial inquiries to the CSpOC SSA Sharing Cell. The SSA Sharing Team will respond to your inquiry, or put you in contact with the appropriate CSpOC personnel.
Phone: +1-805-606-2675 or DSN 276-2675
CSpOC Spaceflight Safety Team
Please contact the CSpOC Spaceflight Safety Team for routine conjunction assessment support. They are manned 24 hours a day, 7 days a week.
Phone: +1-805-605-3533 or DSN 275-3533
|Orbital Data Request||Request all advanced services||docx pdf|
|Form 22||Provide detailed parameters on launch collision avoidance requirements||docx|
|R-15 Form||Provide detailed parameters on an upcoming launch and/or satellites to achieve orbit||docx|
|Early Orbit Maneuver Plan||List maneuver schedule and screening requirements for satellite(s) as they transfer from spacecraft separation to final orbit||xlsx|
Please read the following terms and conditions of the User Agreement carefully! This website permits access to U.S. Government space situational awareness information to approved users only. To obtain access, all users must abide by the following terms and conditions:
The User agrees not to transfer any data or technical information received from this website, or other U.S. Government source, including the analysis of data, to any other entity without prior express approval. See, 10 USC 2274(c)(2).
The User agrees to pay an amount that may be charged. The present U.S. Government policy is not to charge for website access. The website will provide notification should this policy change. See, 10 USC 2274(c)(1).
The User agrees to hold harmless the U.S. Government, any agencies and instrumentalities thereof, and any individuals, firms, corporations, and other persons acting for the United States. Such shall be immune from any suit in any court for any cause of action arising from the provision or receipt of space situational awareness services or information, whether or not provided in accordance with 10 USC 2274, or any related action or omission. See, 10 USC 2274 (g).
The User agrees he or she will only enter this site utilizing his or her own username and password. The User agrees not to share, assign or transfer his or her username or password to another. Each individual user or entity is required to obtain a separate account. See, 10 USC 2274(c)(3).
The User agrees to provide a valid and working email address at registration and for the duration of Account usage. This ensures effective communication with and delivery of services to the User. As part of the registration process, the User will be asked to provide and verify his/her email address.
The User agrees these terms and conditions shall be governed by and construed in accordance with U.S. Federal law.
Approved access must be renewed periodically. The U.S. Government may unilaterally terminate this agreement for any reason.
The agreed upon terms and conditions above do not alter in any way those of any other written agreement with the U.S. Government for space situational awareness services and information. The U.S. Government reserves the right to change or modify these terms and conditions at any time, and without prior notification.
TWO-LINE ELEMENT (TLE) SET IS THE MEAN KEPLERIAN ORBITAL ELEMENT AT A GIVEN POINT IN TIME FOR EACH SPACE OBJECT REPORTED. A TLE IS GENERATED USING THE SIMPLIFIED GENERAL PERTURBATIONS THEORY AND IS REASONABLY ACCURATE FOR LONG PERIODS OF TIME. A TLE AVAILABLE TO THE PUBLIC SHOULD NOT BE USED FOR CONJUNCTION ASSESSMENT PREDICTION. SATELLITE OPERATORS ARE DIRECTED TO CONTACT THE JOINT SPACE OPERATIONS CENTER AT 805-605-3533 FOR ACCESS TO APPROPRIATE DATA AND ANALYSIS TO SUPPORT OPERATIONAL SATELLITES.
THIS SITE MAY BE INACCESSIBLE FOR SHORT PERIODS OF TIME FOR ROUTINE MAINTENANCE AND UPDATES. THE U.S. GOVERNMENT RESERVES THE RIGHT TO LIMIT BOTH ACCESS DURATION AND DATA AMOUNTS FOR ANY USER.
U.S. GOVERNMENT DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THIS WEBSITE OR THAT THE WEBSITE WILL BE UNINTERRUPTED, ERROR FREE, THAT DEFECTS WILL BE CORRECTED, OR THAT THE WEBSITE OR SERVER WILL BE FREE OF VIRUSES, OR OTHER TECHNICAL PROBLEMS.
Current as of 13 March 2013.
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Remember that e-mail is not necessarily secure against interception. If your communication is sensitive, or includes personal information such as your Social Security number, you should consider sending it by postal mail instead.
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For detailed questions regarding the satellite data, ephemeris, or decay information presented on this website, please email the data provider (Combined Space Operations Center) at firstname.lastname@example.org.
For permission to redistribute space-track data, information outside of what space-track provides, requests for launch support, and requests for Conjunction Assessment, please submit an Orbital Data Request.
For problems with Laser Clearinghouse procedures or documents, please contact the LCH team.
For problems with www.space-track.org website functionality, please email email@example.com.