converting IMAGE_TIME UTC to UT1 |
converting IMAGE_TIME UTC to UT1 |
Jun 22 2016, 12:43 AM
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#1
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Junior Member Group: Members Posts: 91 Joined: 21-August 06 Member No.: 1063 |
When images are taken the PDS header for a .IMG image file alway gives the "IMAGE_TIME" date in UTC time
like 2006-05-18T01:30:33.015Z which is zulu UTC If i wanted to to get the matching UT1 that NASA might use for that particular "IMAGE_TIME" I would need to know how they handle leap seconds. From my reading here http://tf.nist.gov/pubs/bulletin/leapsecond.htm It looks like there are two resolutions It says "The resolution of the DUT1 correction is 0.1 s, and represents an average value for an extended range of dates. Therefore, it will not agree exactly with the weekly UT1-UTC(NIST) values shown in the earlier table, which have 1 ms resolution and are updated weekly" So my question would be . What would NASA use to get the UT1 for that "IMAGE_TIME" if it was making a simulator or something? the 0.1 resolution or the weekly 1 ms resolution? I might guess the higher resolution but maybe thats over kill or to inconvenient or may doesnt matter which resolution. |
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Jun 22 2016, 12:56 AM
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#2
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
isis3 and any software that uses the spice data , uses the "naif0011.tls "
a short text file that is documented ftp://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/ CODE KPL/LSK
LEAPSECONDS KERNEL FILE =========================================================================== Modifications: -------------- 2015, Jan. 5 NJB Modified file to account for the leapsecond that will occur on June 30, 2015. 2012, Jan. 5 NJB Modified file to account for the leapsecond that will occur on June 30, 2012. 2008, Jul. 7 NJB Modified file to account for the leapsecond that will occur on December 31, 2008. 2005, Aug. 3 NJB Modified file to account for the leapsecond that will occur on December 31, 2005. 1998, Jul 17 WLT Modified file to account for the leapsecond that will occur on December 31, 1998. 1997, Feb 22 WLT Modified file to account for the leapsecond that will occur on June 30, 1997. 1995, Dec 14 KSZ Corrected date of last leapsecond from 1-1-95 to 1-1-96. 1995, Oct 25 WLT Modified file to account for the leapsecond that will occur on Dec 31, 1995. 1994, Jun 16 WLT Modified file to account for the leapsecond on June 30, 1994. 1993, Feb. 22 CHA Modified file to account for the leapsecond on June 30, 1993. 1992, Mar. 6 HAN Modified file to account for the leapsecond on June 30, 1992. 1990, Oct. 8 HAN Modified file to account for the leapsecond on Dec. 31, 1990. Explanation: ------------ The contents of this file are used by the routine DELTET to compute the time difference [1] DELTA_ET = ET - UTC the increment to be applied to UTC to give ET. The difference between UTC and TAI, [2] DELTA_AT = TAI - UTC is always an integral number of seconds. The value of DELTA_AT was 10 seconds in January 1972, and increases by one each time a leap second is declared. Combining [1] and [2] gives [3] DELTA_ET = ET - (TAI - DELTA_AT) = (ET - TAI) + DELTA_AT The difference (ET - TAI) is periodic, and is given by [4] ET - TAI = DELTA_T_A + K sin E where DELTA_T_A and K are constant, and E is the eccentric anomaly of the heliocentric orbit of the Earth-Moon barycenter. Equation [4], which ignores small-period fluctuations, is accurate to about 0.000030 seconds. The eccentric anomaly E is given by [5] E = M + EB sin M where M is the mean anomaly, which in turn is given by [6] M = M + M t 0 1 where t is the number of ephemeris seconds past J2000. Thus, in order to compute DELTA_ET, the following items are necessary. DELTA_TA K EB M0 M1 DELTA_AT after each leap second. The numbers, and the formulation, are taken from the following sources. 1) Moyer, T.D., Transformation from Proper Time on Earth to Coordinate Time in Solar System Barycentric Space-Time Frame of Reference, Parts 1 and 2, Celestial Mechanics 23 (1981), 33-56 and 57-68. 2) Moyer, T.D., Effects of Conversion to the J2000 Astronomical Reference System on Algorithms for Computing Time Differences and Clock Rates, JPL IOM 314.5--942, 1 October 1985. The variable names used above are consistent with those used in the Astronomical Almanac. \begindata DELTET/DELTA_T_A = 32.184 DELTET/K = 1.657D-3 DELTET/EB = 1.671D-2 DELTET/M = ( 6.239996D0 1.99096871D-7 ) DELTET/DELTA_AT = ( 10, @1972-JAN-1 11, @1972-JUL-1 12, @1973-JAN-1 13, @1974-JAN-1 14, @1975-JAN-1 15, @1976-JAN-1 16, @1977-JAN-1 17, @1978-JAN-1 18, @1979-JAN-1 19, @1980-JAN-1 20, @1981-JUL-1 21, @1982-JUL-1 22, @1983-JUL-1 23, @1985-JUL-1 24, @1988-JAN-1 25, @1990-JAN-1 26, @1991-JAN-1 27, @1992-JUL-1 28, @1993-JUL-1 29, @1994-JUL-1 30, @1996-JAN-1 31, @1997-JUL-1 32, @1999-JAN-1 33, @2006-JAN-1 34, @2009-JAN-1 35, @2012-JUL-1 36, @2015-JUL-1 ) \begintext |
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Jun 22 2016, 06:15 AM
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#3
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Senior Member Group: Members Posts: 2511 Joined: 13-September 05 Member No.: 497 |
One nearly always uses ET, not UT1. I just call NAIF utc2et and let it worry about the details.
-------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Jun 23 2016, 07:17 PM
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#4
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Junior Member Group: Members Posts: 91 Joined: 21-August 06 Member No.: 1063 |
Thank you
Do you by chance know what the K constant and the EB stand for? |
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