[LEAPSECS] IERS Message No. 180: Revision of IERS Earth Rotation Series effective 1 February 2011

[Rob Seaman]

Good catch!  This should be entertaining...
--
On Jan 5, 2011, at 12:42 PM, Poul-Henning Kamp wrote:


> In message <371BE82A03680E4087F343D5C9883D8D112403 at FS029EXCH.bkg>, central_bure

> au at iers.org writes:

> 

>> ************************************************************************

>> IERS Message No. 180                                    January 05, 2011

>> ************************************************************************

>> 

>> Revision of IERS Earth Rotation Series effective 1 February 2011

>> 

>> [...]

>> 

>>  2) Changes in UT1-TAI and celestial pole offsets are respectively on

>>     the order of 2 s, 1, and 17 as which are at the level of the WRMS

>>     between IVS individual solutions.

> 

> TAI is supposed to be a "uniform atomic timescale", so I cannot

> imagine they would have stuck/removed two seconds from it because

> the figured out better params for Earth orientation.

> 

> Unless to reinforce that people should not use it for anything ?

> 

> Jumping UT1 by two seconds, would send DUT >1s, possibly >2s depending

> on the signs.

> 

> The transition date is 2011-02-01.

> 

> I believe we should have seen Bul-C for 2011-06-31 already (six months

> notice, remeber ?) but they usually run two weeks late.

> 

> So are we set for 4 months of DUT>1s or 4 months DUT>2s + 6 months

> DUT>1s now ?

> 

> Can somebody explain this ?

> 

> Rationally ?

> 

> Poul-Henning

> 

> Not updated:

> 	http://hpiers.obspm.fr/eop-pc/earthor/utc/TAI-UTC_tab.html

> 

> -- 

> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20

> phk at FreeBSD.ORG         | TCP/IP since RFC 956

> FreeBSD committer       | BSD since 4.3-tahoe    

> Never attribute to malice what can adequately be explained by incompetence.

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