TimeGalexSec#

class astropy.time.TimeGalexSec(val1, val2, scale, precision, in_subfmt, out_subfmt, from_jd=False)[source]#

Bases: TimeUnix

GALEX time: seconds since 1980-01-06 00:00:00 UTC not including leap seconds.

This is equivalent to the unix time minus 315964800.0, as shown below:

>>> t = Time("2025-01-01")
>>> t.unix - t.galexsec
np.float64(315964800.0)

In GALEX data, due to uncertainty in the spacecraft clock, the absolute time is only accurate to about 1-10 seconds while the relative time within an observation is better than 0.005 s or so, except on days with leap seconds, where relative times can be wrong by up to 1 s. See question 101.2 in https://www.galex.caltech.edu/researcher/faq.html

Attributes Summary

`epoch`	Reference epoch time from which the time interval is measured.
`epoch_format`
`epoch_scale`
`epoch_val`
`epoch_val2`
`in_subfmt`
`jd1`
`jd2`
`name`
`out_subfmt`
`precision`
`scale`	Time scale.
`subfmts`
`unit`
`value`	Return time representation from internal jd1 and jd2.

Methods Summary

`fill_value`(subfmt)	Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.
`set_jds`(val1, val2)	Initialize the internal jd1 and jd2 attributes given val1 and val2.
`to_value`([parent])	Return time representation from internal jd1 and jd2.

Attributes Documentation

epoch#: Reference epoch time from which the time interval is measured.

epoch_format = 'iso'#

epoch_scale = 'utc'#

epoch_val = '1980-01-06 00:00:00'#

epoch_val2 = None#

in_subfmt#

jd1#

jd2#

name = 'galexsec'#

out_subfmt#

precision#

scale#: Time scale.

subfmts = (('float', <class 'numpy.float64'>, None, <ufunc 'add'>), ('long', <class 'numpy.longdouble'>, <function longdouble_to_twoval>, <function twoval_to_longdouble>), ('decimal', <class 'numpy.object_'>, <numpy.vectorize object>, <numpy.vectorize object>), ('str', <class 'numpy.str_'>, <numpy.vectorize object>, <numpy.vectorize object>), ('bytes', <class 'numpy.bytes_'>, <numpy.vectorize object>, <numpy.vectorize object>))#

unit = 1.1574074074074073e-05#

value#

Methods Documentation

classmethod fill_value(subfmt)#

Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.

This is used as a fill value for masked arrays to ensure that any ERFA operations on the masked array will not fail due to the masked value.

set_jds(val1, val2)#: Initialize the internal jd1 and jd2 attributes given val1 and val2. For an TimeFromEpoch subclass like TimeUnix these will be floats giving the effective seconds since an epoch time (e.g. 1970-01-01 00:00:00).

to_value(parent=None, **kwargs)#: Return time representation from internal jd1 and jd2. Subclasses that require parent or to adjust the jds should override this method.