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A two-line element set (TLE, or more rarely 2LE) or three-line element set (3LE) is a data format encoding a list of orbital elements of an Earth-orbiting object for a given point in time, the epoch. Using a suitable prediction formula, the state (position and velocity) at any point in the past or future can be estimated to some accuracy.
Keplerian elements parameters can be encoded as text in a number of formats. The most common of them is the NASA / NORAD "two-line elements" (TLE) format, [4] originally designed for use with 80 column punched cards, but still in use because it is the most common format, and 80-character ASCII records can be handled efficiently by modern databases.
Kimber Custom TLE II, a model of the Kimber Custom handgun; Temporal light effects, wanted or unwanted effects caused by light modulations; Total lunar eclipse, an astronomical event; Transient luminous event, or upper-atmospheric lightning, a weather phenomenon; Two-line element set, a format for distributing orbital element data
TLE format has 5-digit catalog number limitation which means for 100,000 plus tracked objects an alternate system is being implemented. [1] Then there are issues like Y2K problem for Epoch Year too. May be a new section would be useful here in educating public.
The Satellite Catalog Number (SATCAT), also known as NORAD Catalog Number, NORAD ID, USSPACECOM object number, is a sequential nine-digit number assigned by the United States Space Command (USSPACECOM), and previously the North American Aerospace Defense Command (NORAD), in the order of launch or discovery to all artificial objects in the orbits of Earth and those that left Earth's orbit. [1]
This is a list of file formats used by computers, ... (PDA) document index file; PDF – Portable Document Format; PROTONDOC – Proton Docs file shortcut;
Supports a range of annotation types. Annotations are stored separately from the unmodified PDF file, or (since version 0.15 with Poppler 0.20) can be saved in the document as standard PDF annotations. Evince: GNU GPL: Yes Yes Default PDF and file viewer for GNOME; replaces GPdf. Supports addition and removal (since v3.14), of basic text note ...
For orbit propagation purposes, there is a field for BSTAR drag in two-line element set (TLE) files, where it is to be given in units of inverse Earth radii. [2] The corresponding reference air density is given as / (). [3]