D_SUN_TO_GALACTIC_CENTER#

gammapy.utils.coordinates.D_SUN_TO_GALACTIC_CENTER = <Quantity 8.5 kpc>#

A Quantity represents a number with some associated unit.

Parameters

valuenumber, ndarray, Quantity (sequence), or str: The numerical value of this quantity in the units given by unit. If a Quantity or sequence of them (or any other valid object with a unit attribute), creates a new Quantity object, converting to unit units as needed. If a string, it is converted to a number or Quantity, depending on whether a unit is present.
unitunit-like: An object that represents the unit associated with the input value. Must be an UnitBase object or a string parseable by the units package.
dtype~numpy.dtype, optional: The dtype of the resulting Numpy array or scalar that will hold the value. If not provided, it is determined from the input, except that any integer and (non-Quantity) object inputs are converted to float by default. If None, the normal numpy.dtype introspection is used, e.g. preventing upcasting of integers.
copybool, optional: If True (default), then the value is copied. Otherwise, a copy will only be made if __array__ returns a copy, if value is a nested sequence, or if a copy is needed to satisfy an explicitly given dtype. (The False option is intended mostly for internal use, to speed up initialization where a copy is known to have been made. Use with care.)
order{‘C’, ‘F’, ‘A’}, optional: Specify the order of the array. As in array. This parameter is ignored if the input is a Quantity and copy=False.
subokbool, optional: If False (default), the returned array will be forced to be a Quantity. Otherwise, Quantity subclasses will be passed through, or a subclass appropriate for the unit will be used (such as Dex for u.dex(u.AA)).
ndminint, optional: Specifies the minimum number of dimensions that the resulting array should have. Ones will be pre-pended to the shape as needed to meet this requirement. This parameter is ignored if the input is a Quantity and copy=False.

Raises

TypeError: If the value provided is not a Python numeric type.
TypeError: If the unit provided is not either a Unit object or a parseable string unit.

Notes

Quantities can also be created by multiplying a number or array with a Unit. See https://docs.astropy.org/en/latest/units/

Unless the dtype argument is explicitly specified, integer or (non-Quantity) object inputs are converted to float by default.