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% @(#)computbary.hlq 19.1 (ESO-IPG) 02/25/03 14:03:02
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%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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%.COPYRIGHT (c) 1992 European Southern Observatory
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%.KEYWORDS MIDAS, help files, COMPUTE/BARYCORR
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%.PURPOSE On-line help file for the command: COMPUTE/BARYCORR
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%.VERSION 1.0 02-JUL-1990 : Creation, DB
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%.VERSION 1.1 02-SEP-1992 : Change to eastern longitude, PJG
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%----------------------------------------------------------------
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COMPUTE/BARYCORR 10-OCT-1995 DB
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COMPUTE/BARYCORR date UT alpha delta [longitude] [latitude]
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COMPUTE/BARYCORR table.tbl [longitude] [latitude]
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COMPUTE/BARYCORR image alpha delta [longitude] [latitude]
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correct universal times and radial velocities to center of sun or
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barycenter of solar system
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Correct universal times and radial velocities to center of
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sun or barycenter of solar system .
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a) COMPUTE/BARYCORR date UT alpha delta [longitude] [latitude]
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b) COMPUTE/BARYCORR table.tbl [longitude] [latitude]
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c) COMPUTE/BARYCORR image alpha delta [longitude] [latitude]
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UT = universal time (hour,min,sec)
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alpha = right ascension (hour,min,sec)
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delta = declination (degree,min,sec)
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longitude = EAST longitude of observatory (degree,min,sec),
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default: -70,43,55.35 (= Schmidt telescope, La Silla)
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NOTE: Eastern longitudes are used conforming to IAU.
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latitude = of observatory (degree,min,sec), defaulted to
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-29,15,25.8 (= Schmidt telescope, La Silla)
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table = name of table with the following columns:
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:AHR, :MIN, :ASEC right ascension of object
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:DDEG, :DMIN :DSEC declination of object
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:YEAR :MONTH :DAY date of observation
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:UTHR :UTMIN :UTSEC UT of observation
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image = name of image, then the date is taken from double prec.
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descriptor O_TIME(1,2,3) and the UT from O_TIME(5)
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longitude = EAST longitude of observatory (degree,min,sec)
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default: -70,43,35.55 (= Schmidt telescope, La Silla)
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NOTE: Eastern longitudes are used conforming to IAU.
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latitude = of observatory (degree,min,sec), defaulted to
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-29,15,25.8 (= Schmidt telescope, La Silla)
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Reference: P. Stumpff, A\&A Suppl. Ser. 41, pp. 1-8 (1980)
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All times, dates, and coordinates are of type REAL so that,
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e.g., the date can also be entered as 1987.787,0,0 or just
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1987.767 . However, parameters must not be combined. That is,
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in the example given, the fraction of the year may contain
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only the number of elapsed full days, not also UT.
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The same applies to table input, however all input
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columns must be present even if they contain only zeros. The
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minus sign for negative values may occur in any field.
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a)+ b) Output: will be written to the following keywords:
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OUTPUTD/D/1/1 barycentric correction to time (days)\\
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OUTPUTD/D/2/1 heliocentric correction to time (days)\\
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OUTPUTR/R/1/1 barycentric correction to radial velocity (km/s)\\
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OUTPUTR/R/2/1 heliocentric correction to radial velocity (km/s)\\
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b) Output: the following table columns will be created or updated:
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:BCT barycentric correction time\\
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:HCT heliocentric correction time\\
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:EBRV earth's barycentric radial velocity\\
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:EHRV earth's heliocentric radial velocity\\
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:EDV earth's diurnal velocity (already included in
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(Note that the table option is very slow.)
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For the ultimate accuracy, it will be necessary to precess
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(command COMPUTE/PRECESS) the coordinates to the date of the
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In order to correct measured RV's and JD's, the corrections need
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to be added as they are, i.e. taking into account their signs.
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Eastern longitudes are positive and western counted
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negative conforming to IAU recommendations.
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To enable automatic distinction between tables and images by the
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command, you should enter the name with the file type (extension),
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e.g. name.tbl or name.bdf. If no file type is given we default to
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a table, i.e. we use `name.tbl' .
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COMPUTE/BARYCORR obslist.tbl 155,28.3 19,49.6
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Compute corrections to UT's and RV's of observations obtained
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COMPUTE/BARY 1987,12,24 1,39,10 6,44,35.8 -16,41,56
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Compute corrections to UT's and RV's of observations of Sirius
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obtained at La Silla on Xmas eve 1987
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COMPUTE/BARYCORR obsfile.bdf 6,44,35.8 -16,41,56
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Compute corrections to UT's and RV's of observations of Sirius
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obtained at La Silla; date and UT are taken from descriptor
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O_TIME of `obsfile.bdf'.