Source code for orbitx.utils._tle.get_ballistic_coefficient
"""orbitx.utils._tle.get_ballistic_coefficient -"""
"""___Third-Party Modules___"""
"""___NPL Modules___"""
"""__Built-In Modules__"""
"""___Authorship___"""
__author__ = __author__ = [
"Sajedeh Behnia <sajedeh.behnia@npl.co.uk>",
"Sam Hunt <sam.hunt@npl.co.uk>",
"Mattea Goalen <mattea.goalen@npl.co.uk>",
"Zhav (Xavier) Loizeau <xavier.loizeau@npl.co.uk>",
]
__created__ = "29/09/2025"
__version__ = 1.0
__maintainer__ = [
"Sajedeh Behnia <sajedeh.behnia@npl.co.uk>",
"Sam Hunt <sam.hunt@npl.co.uk>",
"Mattea Goalen <mattea.goalen@npl.co.uk>",
"Zhav (Xavier) Loizeau <xavier.loizeau@npl.co.uk>",
]
__status__ = "Development"
__all__ = ["get_ballistic_coefficient"]
[docs]
def get_ballistic_coefficient(line1: str) -> float:
r"""Finds the ballistic coefficient (first derivate of the mean motion) of the satellite from the first line of the TLE.
The ballistic coefficient corresponds to the characters 34 to 43 of the first line.
Args:
line1 (str): The first line of the considered TLE
Returns:
float: The ballistic coefficient
Example:
.. code-block:: python3
line1 = "1 25544U 98067A 08264.51782528 -.00002182 00000-0 -11606-4 0 2927"
ballistic_coefficient = get_ballistic_coefficient(line1)
print(ballistic_coefficient)
.. code-block:: text
-2.182e-05
"""
return float(line1[33:43])
