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Track Earth satellites given TLE data, using up-to-date 2020 SGP4 routines.

Project description

This Python package computes the position and velocity of an earth-orbiting satellite, given the satellite’s TLE orbital elements from a source like CelesTrak. It implements the most recent version of SGP4, and is regularly run against the SGP4 test suite to make sure that its satellite position predictions agree to within 0.1 mm with the predictions of the standard distribution of the algorithm. This error is far less than the 1–3 km/day by which satellites themselves deviate from the ideal orbits described in TLE files.

  • If your platform supports it, this package compiles and uses the verbatim source code from the official C++ version of SGP4.
  • Otherwise, a slower but reliable Python implementation of SGP4 is used instead.
  • If, instead of asking for the position of a single satellite at a single time, you supply this library with an array of satellites and an array of times, then the arrays can be processed using machine code instead of requiring you to run a slow Python loop over them.

Note that the SGP4 propagator returns raw x,y,z Cartesian coordinates in a “True Equator Mean Equinox” (TEME) reference frame that’s centered on the Earth but does not rotate with it — an “Earth centered inertial” (ECI) reference frame. The SGP4 propagator itself does not implement the math to convert these positions into more official ECI frames like J2000 or the ICRF; nor to convert positions into any Earth-centered Earth-fixed (ECEF) frames like the ITRS; nor to convert them to latitudes and longitudes through an Earth ellipsoid like WGS84.

For conversions into other coordinate frames, look for a comprehensive astronomy library that is built atop this one, like the Skyfield library:


This library uses the same function names as the official C++ code, to help users who may already be familiar with SGP4 in other languages. Here is how to compute the x,y,z position and velocity for the International Space Station at 12:50:19 on 29 June 2000:

>>> from sgp4.api import Satrec
>>> s = '1 25544U 98067A   19343.69339541  .00001764  00000-0  38792-4 0  9991'
>>> t = '2 25544  51.6439 211.2001 0007417  17.6667  85.6398 15.50103472202482'
>>> satellite = Satrec.twoline2rv(s, t)
>>> jd, fr = 2458827, 0.362605
>>> e, r, v = satellite.sgp4(jd, fr)
>>> e
>>> print(r)  # True Equator Mean Equinox position (km)
(-6102.44..., -986.33..., -2820.31...)
>>> print(v)  # True Equator Mean Equinox velocity (km/s)
(-1.45..., -5.52..., 5.10...)

As input, you can provide either:

  • A simple floating-point Julian Date for jd and the value 0.0 for fr, if you are happy with the precision of a 64-bit floating point number. Note that modern Julian Dates are greater than 2,450,000 which means that nearly half of the precision of a 64-bit float will be consumed by the whole part that specifies the day. The remaining digits will provide a precision for the fraction of around 20.1 µs. This should be no problem for the accuracy of your result — satellite positions usually off by a few kilometers anyway, far less than a satellite moves in 20.1 µs — but if you run a solver that dives down into the microseconds while searching for a rising or setting time, the solver might be bothered by the 20.1 µs plateau between each jump in the satellite’s position.
  • Or, you can provide a coarse date jd plus a very precise fraction fr that supplies the rest of the value. The Julian Date for which the satellite position is computed is the sum of the two values. One common practice is to provide the whole number as jd and the fraction as fr; another is to have jd carry the fraction 0.5 since UTC midnight occurs halfway through each Julian Date. Either way, splitting the value allows a solver to run all the way down into the nanoseconds and still see SGP4 respond smoothly to tiny date adjustments with tiny changes in the resulting satellite position.

Here is how to intrepret the results:

  • e will be a non-zero error code if the satellite position could not be computed for the given date. You can from sgp4.api import SGP4_ERRORS to access a dictionary mapping error codes to error messages explaining what each code means.
  • r measures the satellite position in kilometers from the center of the earth in the idiosyncratic True Equator Mean Equinox coordinate frame used by SGP4.
  • v velocity is the rate at which the position is changing, expressed in kilometers per second.

If your application does not natively handle Julian dates, you can compute jd and fr from calendar dates using jday().

>>> from sgp4.api import jday
>>> jd, fr = jday(2019, 12, 9, 12, 0, 0)
>>> jd
>>> fr


The industry is making adjustments because the fixed-width TLE format will soon run out of satellite numbers.

  • Some TLE files now use a new “Alpha-5” convention that expands the range of satellite numbers by using an initial letter; for example, “E8493” means satellite 148493. This library now supports the Alpha-5 convention and should return the correct integer in Python.
  • Some authorities are now distributing satellite elements in an “OMM” Orbit Mean Elements Message format that replaces the TLE format. You can learn about OMM in Dr. T.S. Kelso’s “A New Way to Obtain GP Data” at the CelesTrak site.

You can already try out experimental support for OMM:

>>> from sgp4 import omm

Reading OMM data takes two steps, because OMM supports several different text formats. First, parse the input text to recover the field names and values that it stores; second, build a Python satellite object from those field values. For example, to load OMM from XML:

>>> with open('sample_omm.xml') as f:
...     fields = next(omm.parse_xml(f))
>>> sat = Satrec()
>>> omm.initialize(sat, fields)

Or, to load OMM from CSV:

>>> with open('sample_omm.csv') as f:
...     fields = next(omm.parse_csv(f))
>>> sat = Satrec()
>>> omm.initialize(sat, fields)

Either way, the satellite object should wind up properly initialized and ready to start producing positions.

If you are interested in saving satellite parameters using the new OMM format, then read the section on “Export” below.


Over a given satellite’s lifetime, dozens or hundreds of different TLE records will be produced as its orbit evolves. Each TLE record specifies the “epoch date” for which it is most accurate. Typically a TLE is only useful for a couple of weeks to either side of its epoch date, beyond which its predictions become unreliable.

Satellite objects natively provide their epoch as a two-digit year and then a fractional number of days into the year:

>>> satellite.epochyr
>>> satellite.epochdays

Because Sputnik was launched in 1957, satellite element sets will never refer to an earlier year, so years 57 through 99 mean 1957–1999 while 0 through 56 mean 2000–2056. The TLE format will presumably be obsolete in 2057 and have to be upgraded to 4-digit years.

To turn the number of days and its fraction into a calendar date and time, use the days2mdhms() function.

>>> from sgp4.api import days2mdhms
>>> month, day, hour, minute, second = days2mdhms(19, 343.69339541)
>>> month
>>> day
>>> hour
>>> minute
>>> second

The SGP4 library also translates those two numbers into a Julian date and fractional Julian date, since Julian dates are more commonly used in astronomy.

>>> satellite.jdsatepoch
>>> satellite.jdsatepochF

Finally, a convenience function is available in the library if you need the epoch date and time as Python datetime.

>>> from sgp4.conveniences import sat_epoch_datetime
>>> sat_epoch_datetime(satellite)
datetime.datetime(2019, 12, 9, 16, 38, 29, 363423, tzinfo=UTC)

Array Acceleration

To avoid the expense of Python loops when you have many dates, you can pass them as arrays to another method that understands NumPy:

>>> import numpy as np
>>> np.set_printoptions(precision=2)
>>> jd = np.array((2458826, 2458826, 2458826, 2458826))
>>> fr = np.array((0.0001, 0.0002, 0.0003, 0.0004))
>>> e, r, v = satellite.sgp4_array(jd, fr)
>>> print(e)
[0 0 0 0]
>>> print(r)
[[-3431.31  2620.15 -5252.97]
 [-3478.86  2575.14 -5243.87]
 [-3526.09  2529.89 -5234.28]
 [-3572.98  2484.41 -5224.19]]
>>> print(v)
[[-5.52 -5.19  1.02]
 [-5.49 -5.22  1.08]
 [-5.45 -5.25  1.14]
 [-5.41 -5.28  1.2 ]]

To avoid the expense of Python loops when you have many satellites and dates, build a SatrecArray from several individual satellites. Its sgp4() method will expect both jd and fr to be NumPy arrays, so if you only have one date, be sure to provide NumPy arrays of length one. Here is a sample computation for 2 satellites and 4 dates:

>>> s = '1 20580U 90037B   19342.88042116  .00000361  00000-0  11007-4 0  9996'
>>> t = '2 20580  28.4682 146.6676 0002639 185.9222 322.7238 15.09309432427086'
>>> satellite2 = Satrec.twoline2rv(s, t)
>>> from sgp4.api import SatrecArray
>>> a = SatrecArray([satellite, satellite2])
>>> e, r, v = a.sgp4(jd, fr)
>>> np.set_printoptions(precision=2)
>>> print(e)
[[0 0 0 0]
 [0 0 0 0]]
>>> print(r)
[[[-3431.31  2620.15 -5252.97]
  [-3478.86  2575.14 -5243.87]
  [-3526.09  2529.89 -5234.28]
  [-3572.98  2484.41 -5224.19]]
 [[ 5781.85  2564.   -2798.22]
  [ 5749.36  2618.59 -2814.63]
  [ 5716.35  2672.94 -2830.78]
  [ 5682.83  2727.05 -2846.68]]]
>>> print(v)
[[[-5.52 -5.19  1.02]
  [-5.49 -5.22  1.08]
  [-5.45 -5.25  1.14]
  [-5.41 -5.28  1.2 ]]
 [[-3.73  6.33 -1.91]
  [-3.79  6.3  -1.88]
  [-3.85  6.28 -1.85]
  [-3.91  6.25 -1.83]]]


If you have a Satrec you want to share with friends or persist to a file, there’s an export routine that will turn it back into a TLE:

>>> from sgp4 import exporter
>>> line1, line2 = exporter.export_tle(satellite)
>>> line1
'1 25544U 98067A   19343.69339541  .00001764  00000-0  38792-4 0  9991'
>>> line2
'2 25544  51.6439 211.2001 0007417  17.6667  85.6398 15.50103472202482'

And another that produces the fields defined by the new OMM format (see the “OMM” section above):

>>> from pprint import pprint
>>> fields = exporter.export_omm(satellite, 'ISS (ZARYA)')
>>> pprint(fields)
{'ARG_OF_PERICENTER': 17.6667,
 'BSTAR': 3.8792e-05,
 'ECCENTRICITY': 0.0007417,
 'EPOCH': '2019-12-09T16:38:29.363423',
 'INCLINATION': 51.6439,
 'MEAN_ANOMALY': 85.6398,
 'MEAN_MOTION': 15.501034720000002,
 'MEAN_MOTION_DOT': 1.764e-05,
 'NORAD_CAT_ID': 25544,
 'OBJECT_ID': '1998-067A',
 'RA_OF_ASC_NODE': 211.2001,
 'REV_AT_EPOCH': 20248,


The SGP4 algorithm operates atop a set of constants specifying how strong the Earth’s gravity is. The most recent official paper on SGP4 (see below) specifies that “We use WGS-72 as the default value”, so this Python module uses the same default. But in case you want to use either the old legacy version of the WGS-72 constants, or else the non-standard but more modern WGS-84 constants, the twoline2rv() constructor takes an optional argument:

>>> from sgp4.api import WGS72OLD, WGS72, WGS84
>>> satellite3 = Satrec.twoline2rv(s, t, WGS84)

You will in general get less accurate results if you choose WGS-84. Even though it reflects more recent and accurate measures of the Earth, satellite TLEs across the industry are most likely generated with WGS-72 as their basis. The positions you generate will better agree with the real positions of each satellite if you use the same underlying gravity constants as were used to generate the TLE.

Providing your own elements

If instead of parsing a TLE you want to specify orbital elements directly, you can call a satellite object’s sgp4init() method with the new elements:

>>> sat = Satrec()
>>> sat.sgp4init(
...     WGS72,           # gravity model
...     'i',             # 'a' = old AFSPC mode, 'i' = improved mode
...     5,               # satnum: Satellite number
...     18441.785,       # epoch: days since 1949 December 31 00:00 UT
...     2.8098e-05,      # bstar: drag coefficient (1/earth radii)
...     6.969196665e-13, # ndot (NOT USED): ballistic coefficient (revs/day)
...     0.0,             # nddot (NOT USED): mean motion 2nd derivative (revs/day^3)
...     0.1859667,       # ecco: eccentricity
...     5.7904160274885, # argpo: argument of perigee (radians)
...     0.5980929187319, # inclo: inclination (radians)
...     0.3373093125574, # mo: mean anomaly (radians)
...     0.0472294454407, # no_kozai: mean motion (radians/minute)
...     6.0863854713832, # nodeo: right ascension of ascending node (radians)
... )
  • The two parameters marked “NOT USED” above, ndot and nddot, do get saved to the satellite object, and do get written out if you write the parameters to a TLE or OMM file. But they are ignored by SGP4 when doing propagation, so you can leave them 0.0 without any effect on the resulting satellite positions.
  • To compute the “epoch” argument, you can take a normal Julian date and subtract 2433281.5 days.
  • Once the underlying C++ routine is finished, this Python library — as a convenience for callers — goes ahead and sets four time attributes that sgp4init() leaves unset: the date fields epochyr, epochdays, jdsatepoch, and jdsatepochF.

See the next section for the complete list of attributes that are available from the satellite record once it has been initialized.


There are several dozen Satrec attributes that expose data from the underlying C++ SGP4 record. They fall into several categories.


These are copied directly from the TLE record but aren’t used by the propagation math.

satnum — Unique number assigned to the satellite.
classification'U', 'C', or 'S' indicating the element set is Unclassified, Classified, or Secret.
ephtype — Integer “ephemeris type”, used internally by space agencies to mark element sets that are not ready for publication; this field should always be 0 in published TLEs.
elnum — Element set number.
revnum — Satellite’s revolution number at the moment of the epoch, presumably counting from 1 following launch.

The Orbital Elements

These are the orbital parameters, copied verbatim from the text of the TLE record. They describe the orbit at the moment of the TLE’s epoch and so remain constant even as the satellite record is used over and over again to propagate positions for different times.

epochyr — Epoch date: the last two digits of the year.
epochdays — Epoch date: the number of days into the year, including a decimal fraction for the UTC time of day.
ndot — First time derivative of the mean motion (loaded from the TLE, but otherwise ignored).
nddot — Second time derivative of the mean motion (loaded from the TLE, but otherwise ignored).
bstar — Ballistic drag coefficient B* (1/earth radii).
inclo — Inclination (radians).
nodeo — Right ascension of ascending node (radians).
ecco — Eccentricity.
argpo — Argument of perigee (radians).
mo — Mean anomaly (radians).
no_kozai — Mean motion (radians/minute).
no — Alias for no_kozai, for compatibility with old code.

You can also access the epoch as a Julian date:

jdsatepoch — Whole part of the epoch’s Julian date.
jdsatepochF — Fractional part of the epoch’s Julian date.

Derived Orbit Properties

These are computed when the satellite is first loaded, as a convenience for callers who might be interested in them. They aren’t used by the SGP4 propagator itself.

a — Semi-major axis (earth radii).
altp — Altitude of the satellite at perigee (earth radii, assuming a spherical Earth).
alta — Altitude of the satellite at apogee (earth radii, assuming a spherical Earth).
argpdot — Rate at which the argument of perigee is changing (radians/minute).
gsto — Greenwich Sidereal Time at the satellite’s epoch (radians).
mdot — Rate at which the mean anomaly is changing (radians/minute)
nodedot — Rate at which the right ascension of the ascending node is changing (radians/minute).

Propagator Mode

operationmode — A single character that directs SGP4 to either operate in its modern 'i' improved mode or in its legacy 'a' AFSPC mode.
method — A single character, chosen automatically when the orbital elements were loaded, that indicates whether SGP4 has chosen to use its built-in 'n' Near Earth or 'd' Deep Space mode for this satellite.

Results From the Most Recent Call

t — The time you gave when you most recently asked SGP4 to compute this satellite’s position, measured in minutes before (negative) or after (position) the satellite’s epoch.
error — Error code produced by the most recent SGP4 propagation you performed with this element set.

The possible error codes are:

  1. No error.
  2. Mean eccentricity is outside the range 0 ≤ e < 1.
  3. Mean motion has fallen below zero.
  4. Perturbed eccentricity is outside the range 0 ≤ e ≤ 1.
  5. Length of the orbit’s semi-latus rectum has fallen below zero.
  6. (No longer used.)
  7. Orbit has decayed: the computed position is underground. (The position is still returned, in case the vector is helpful to software that might be searching for the moment of re-entry.)

Partway through each propagation, the SGP4 routine saves a set of “singly averaged mean elements” that describe the orbit’s shape at the moment for which a position is being computed. They are averaged with respect to the mean anomaly and include the effects of secular gravity, atmospheric drag, and — in Deep Space mode — of those pertubations from the Sun and Moon that SGP4 averages over an entire revolution of each of those bodies. They omit both the shorter-term and longer-term periodic pertubations from the Sun and Moon that SGP4 applies right before computing each position.

am — Average semi-major axis (earth radii).
em — Average eccentricity.
im — Average inclination (radians).
Om — Average right ascension of ascending node (radians).
om — Average argument of perigee (radians).
mm — Average mean anomaly (radians).
nm — Average mean motion (radians/minute).

Gravity Model Parameters

When the satellite record is initialized, your choice of gravity model results in a slate of eight constants being copied in:

tumin — Minutes in one “time unit”.
xke — The reciprocal of tumin.
mu — Earth’s gravitational parameter (km³/s²).
radiusearthkm — Radius of the earth (km).
j2, j3, j4 — Un-normalized zonal harmonic values J₂, J₃, and J₄.
j3oj2 — The ratio J₃/J₂.

Validation against the official algorithm

This implementation passes all of the automated tests in the August 2010 release of the reference implementation of SGP4 by Vallado et al., who originally published their revision of SGP4 in 2006:

Vallado, David A., Paul Crawford, Richard Hujsak, and T.S. Kelso, “Revisiting Spacetrack Report #3,” presented at the AIAA/AAS Astrodynamics Specialist Conference, Keystone, CO, 2006 August 21–24.

If you would like to review the paper, it is available online. You can always download the latest version of their code for comparison against this Python module (or other implementations) at

For developers

Developers can check out this full project from GitHub:

To run its unit tests, install Python 2, Python 3, and the tox testing tool. The tests runing in Python 2 will exercise the fallback pure-Python version of the routines, while Python 3 exercises the fast new C++ accelerated code:

cd python-sgp4

Legacy API

Before this library pivoted to wrapping Vallado’s official C++ code and was operating in pure Python only, it had a slightly quirkier API, which is still supported for compatibility with older clients. You can learn about it by reading the documentation from version 1.4 or earlier:


2021-07-01 — 2.20

  • Taught sgp4init() to round both epochdays and jdsatepochF to the same 8 decimal places used for the date fraction in a TLE, if the user-supplied epoch itself has 8 or fewer digits behind the decimal point. This should make it easier to build satellites that round-trip to TLE format with perfect accuracy.
  • Fixed how export_tle() formats the BSTAR field when its value, if written in scientific notation, has a positive exponent.
  • Fixed the epochyr assigned by sgp4init() so years before 2000 have two digits instead of three (for example, so that 1980 produces an epochyr of 80 instead of 980).

2021-04-22 — 2.19

  • Extended the documentation on the Python Package Index and in the module docstring so it lists every Satrec attribute that this library exposes; even the more obscure ones might be useful to folks working to analyze satellite orbits.

2021-03-08 — 2.18

  • If a TLE satellite number lacks the required 5 digits, twoline2rv() now gives the underlying C++ library a little help so it can still parse the classification and international designator correctly.
  • The Satrec attributes jdsatepoch, jdsatepochF, epochyr, and epochdays are now writeable, so users can adjust their values manually — which should make up for the fact that the sgp4init() method can’t set them with full floating point precision.
2021-02-17 — 2.17 — Fixed where in the output array the sgp4_array() method writes NaN values when an SGP4 propagation fails.
2021-02-12 — 2.16 — Fixed days2mdhms() rounding to always match TLE epoch.
2021-01-08 — 2.15 — Fixed parsing of the satnum TLE field in the Python fallback code, when the field has a leading space; added OMM export routine.
2020-12-16 — 2.14 — New data formats: added OMM message support for both XML and CSV, and added support for the new Alpha-5 extension to TLE files.
2020-10-14 — 2.13 — Enhanced sgp4init() with custom code that also sets the epochdays and epochyr satellite attributes.
2020-05-28 — 2.12 — Moved the decision of whether to set the locale during twoline2rv() from import time to runtime, for users who change locales after their application is up and running.
2020-05-24 — 2.11 — Fixed a regression in how dates are split into hours, minutes, and seconds that would sometimes produce a time whose second=60, crashing the pure-Python version of the library.
2020-05-22 — 2.10 — Switch the locale temporarily to C during the C++ accelerated twoline2rv(), since it does not protect its sscanf() calls from locales that, like German, expect comma decimal points instead of the period decimal points always used in a TLE.
2020-05-21 — 2.9 — Added sat_epoch_datetime(), expanded documentation around converting a satellite epoch to a date and time, and started rounding the epoch to exactly the digits provided in the TLE; and removed the Satrec.epoch attribute from Python fallback code to better match the C++ version.
2020-05-07 — 2.8 — New function jday_datetime() is now available in the sgp4.conveniences module, thanks to Egemen Imre.
2020-04-24 — 2.7 — New method sgp4init() (thank you, Chris Lewicki!) is available.
2020-04-20 — 2.6 — New routine export_tle() (thank you, Egemen Imre!) is available. Improved how the accelerated C++ backend parses the intldesg string and the revnum integer.
2020-03-22 — 2.5 — Gave the new accelerated twoline2rv() an optional argument that lets the user choose a non-standard set of gravity constants.
2020-02-25 — 2.4 — Improved the jday() docstring; made the old legacy Python resilient if the day of the month is out-of-range (past the end of the month) in a TLE; and Mark Rutten fixed the C++ so it compiles on Windows!
2020-02-04 — 2.3 — Removed experimental code that caused performance problems for users with Numba installed.
2020-02-02 — 2.2 — A second release on Palindrome Day: fix the Satrec .epochyr attribute so it behaves the same way in Python as it does in the official C library, where it is only the last 2 digits of the year; and make .no available in the Python fallback case as well.
2020-02-02 — 2.1 — Add vectorized array method to Satrec object; add .no attribute to new Satrec object to support old code that has not migrated to the new name .no_kozai; gave Python wrapper classes __slots__ to avoid the expense of a per-object attribute dictionary.
2020-01-30 — 2.0 — Rewrite API to use genuine Vallado C++ code on those systems where it can be compiled; add accelerated vectorized array interface; make gstime() a public function; clarify format error message.
2015-01-15 — 1.4 — Display detailed help when TLE input does not match format.
2014-06-26 — 1.3 — Return (NaN,NaN,NaN) vectors on error and set .error_message
2013-11-29 — 1.2 — Made epochyr 4 digits; add datetime for .epoch
2012-11-22 — 1.1 — Python 3 compatibility; more documentation
2012-08-27 — 1.0 — Initial release

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Filename, size sgp4-2.20.tar.gz (160.8 kB) File type Source Python version None Upload date Hashes View

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