NO.  YEAR MO DAY   USNO  SAOPPM D  MAG  %SNL L  W.U.T. LONG LAT STAR NAME               MAG1 MAG2    SEP  PA MAG3  SEP3 PA3

April-May data map

close                             

  62  2003 APR  4 ZC  355   92941   7.4    4+ S  2 17.9 -116  35                                

  64  2003 APR  5 ZC  466   93335   7.3    9+ S  2 57.4 -125  37                                

far

  92  2003 MAY 20 ZC 2910  188722K  4.7   78- S  6 54.2 -107  35 58 omega Sgr             5.6  5.6         51               

  86  2003 MAY 11 ZC 1598   99392K  6.5   68+ N  4 18.9 -128  51                          7.2  7.2    0.1  90               

The predictions commence with a header identifying the site. The predicted information is as follows:

Day   The day of the event.

Time  The universal time, in hours, mins and secs.

P     The type of event (phase):

      D  disappearance	

      d  -  star less than 1 mag brighter than predicted visibility limit.

      R  reappearance	

      r  -  star less than 1 mag brighter than predicted visibility limit.

      Gr grazing occultation at site. At mid-occultation, or closest 

         approach, the star is less than 4" from the limb of the moon 

         (either above or below).

      gr -  star less than 1 mag brighter than predicted visibility limit.

star no  the star identification number, with the catalogue indicated as

         follows:

        nnnn     zc catalogue no.

       nnnnn or

      nnnnnn    sao catalogue number

      xnnnnn    xz94 catalogue no.

     gnnnnnnnn  the hubble guide star catalogue number (note that this

                continues through the double star and spectral type 

                fields.)

      ? nnnn    catalogue no. in another catalogue (with the initial 

                letter of the catalogue file name leading) 

d     the double star code. the following definitions apply:

      a  listed by aiken or burnham

      b  close double, with third star nearby with separate xz entry

      c  listed by innes, couteau, or other visual observers

      d  primary of double, secondary has separate xz entry

      e  secondary of double, primary has separate xz entry

      f  following component

      g  a or c with second star either m, j, u or v, with a third star

         referred to second star

      h  triple: j or u or v, and m

      i  o, with secondary either j, u, or v (third star's data referred

         to secondary)

      j  one-line spectroscopic binary, separation probably <".01

      k  u or v, but duplicity doubtful

      l  triple: j or u, and v; or all v; or all j

      m  mean position of close pair

      n  north component

      o  orbital elements available

      p  preceding component

      q  triple; j or u or v, and o

      r  triple; o and o

      s  south component

      t  triple, v, and a or c; or all a and/or c

      u  separation <".01 (usually a double-line spectroscopic binary)

      v  separation >".01 but not visual (occultation, interferometric or 

         speckle component)

      w  triple; j or u, and a or c

      x  probably a close double, but not certain

      y  triple; k or x, and a or c

      z  triple; o, and a or c or v or x or l

      $  g except m rather than a or c for 1-2 stars

      note: visual observers will usually not notice the duplicity of 

      stars with codes j or u.

sp    the star's spectral type

mag   the star's magnitude, usually visual.

%illum the percent illumination of the moon. if followed by a +, values 

      are for a waxing moon; - for a waning moon and e for illumination 

      during a lunar eclipse. 

elon  the elongation of the moon from the sun, in degrees.

sunalt    the altitude of the sun, but only if it is greater than -12 deg.

moon alt  the altitude of the moon

moon az   the azimuth of the moon

ca    cusp angle - the angle of the event around the limb of the moon, 

      measured from the nearest cusp. -'ve values indicate a bright limb 

      event. the cusps are usually n (north) or s (south), but near full 

      moon can be e (east) or w (west). if a lunar eclipse is in progress, 

	  ca gives is the % distance from the centre of the umbra, and is followed

	  by a 'u'. values up to 103% are possible.

pa    position angle - the angle of the event around the limb of the 

      moon, measured from true north

wa    watts angle - the angle of the event around the limb of the moon, 

      measured eastward from the moon's north pole. essential for 

      reappearance, as it locates the event with reference to lunar 

      features. to use, mark a map of the moon around the circumference

	  at10 deg intervals, starting at the north pole. mare crisium is at 

      about 300 deg. this provides the watts angle scale.

long libn  the libration of the moon in longitude, as seen from the site 

           at the time of the event

lat libn   the libration of the moon in latitude;

a     coefficient for correcting the prediction for changes in site 

      location. the units are seconds of time per minutes of arc. the 

      correction to the prediction for a change in site, in seconds of 

      time, is found by multiplying a by the change in site longitude (in 

      minutes of arc, +'ve to the east) from the prediction site.

b     same as for a, but for changes in latitude (+'ve to the north).