TAI to TT(BIPM2013)

TAI to BIPM-updated TT, 2013 version

This file is constructed from BIPM published data and should never change; updated versions will appear approximately yearly, and do revise old data. Aa result they are given different clock file names, and are treated as different time scales.

The time scale TT is supposed to be a basis for TDB, and is meant to be a stable clock for describing the motions of the solar system. Of necessity it is derived from the practical time scale TAI, which is produced by an ensemble of atomic clocks. A simple realization of TT, such as that implemented by Astropy, simply yields TT = TAI + 32.184 s.

Atomic clocks do wander, and the BIPM can sometimes estimate that wander in retrospect. Rather than revise TAI, the BIPM offers versions of TT that are more stable because they compensate for variations in TAI. These are defined by yearly bulletins, and are referred to in TEMPO2 as TT(BIPMyyyy), where yyyy is the year of the bulletin.

Each bulletin publishes corrections from TAI to TT. It may revise earlier corrections up to about 10 years back, and it contains a formula for making predictions past the end of the data it contains.

This file is pulled from the TEMPO2 repository but is based on BIPM data and should be unchanging.

File	T2runtime/clock/tai2tt_bipm2013.clk
Authority	temporary
URL in repository	https://raw.githubusercontent.com/ipta/pulsar-clock-corrections/main/T2runtime/clock/tai2tt_bipm2013.clk
Original download URL	https://bitbucket.org/psrsoft/tempo2/raw/HEAD/T2runtime/clock/tai2tt_bipm2013.clk
Format	tempo2
Bogus last correction	True
Clock file start	1975-06-26 MJD 42589.0
Clock file end	2013-12-23 MJD 56649.0
Update interval (days)	inf
Last update attempt	2022-06-13
Last update result	Unchanged

Log entries from the last few update attempts:

2022-06-13 13:55:32.920 - Unchanged

Full log

Leading comments from clock file:

#
# 2013 version of BIPM TT scale, see tai2tt_bipm2003.clk for more info
#

All clock corrections:

Recent clock corrections: