;+
; NAME:
;  oc_getstar_hd_test
;
; PURPOSE: (one line)
;  Tests the oc_getstar_hd routines and compares to Vizier results.
;
; DESCRIPTION:
;  Gets the RA/DEC for a number of HD stars.  Precesses them and 
;  prints their coordinates in J2000 and B1900, in d:m:s and d:m.m.
;  These can be compared to the identical output from Vizier, to 
;  verify that precession is done properly.
;
; CATEGORY:
;  Star catalogs
;  
; CALLING SEQUENCE:
;  oc_getstar_hd_test
;
; INPUTS:
;  None
;
; OPTIONAL INPUT PARAMETERS:
;  None
;  
; KEYWORD INPUT PARAMETERS:
;  None
;
; KEYWORD OUTPUT PARAMETERS:
;  None
;
; OUTPUTS:
;  None
;  
; COMMON BLOCKS:
;  None
;
; SIDE EFFECTS:
;  None
;
; RESTRICTIONS:
;  None
;
; EXAMPLE:
;  oc_getstar_hd_test
; 
; MODIFICATION HISTORY:
;  Written  20-Oct-2005 by Henry Throop, SwRI
;  Modified 23-Feb-2006 by HBT. Improved documentation and formatting.
;-

; Sample output for ids = [1000]
; > HD 1000
; > RA = 0h14.37818, dec = -21d11.63297 (J2000, d:m)
; > RA = 0h9.3000002, dec = -21d45 (B1900, d:m)
; > RA = 0h14:22.690771, dec = -21d11:37.978214 (J2000, d:m:s)
;
; Vizier gives the following results for HD 1000
;>  Full_r	_RAJ2000 _DEJ2000   HD	 DM	        RAB1900	DEB1900	Ptm	Ptg	SpType	Tycho
;>  	arcmin	"h:m:s"	"d:m:s" 	  	 	"h:m:s"	"d:m:s"	mag	mag 	  	 
;> 1       0.5	00 14.4	-21 12 	    1000 BD-21 17 	00 09.3	-21 45 	6.85 	7.40	F8 	Tycho
;>              ^^^^^^^^^^^^^^                          ^^^^^^^^^^^^^^
;
; This confirms that oc_getstar_hd is properly reading the HD catalog and performing 1900->2000 precession.
;
; HBT 20-Oct-2005
;

pro oc_getstar_hd_test

; HD numbers to check
  ids	= [1,10, 100,1000, 10000d, 100000d]			
  s	= oc_getstar_hd(ids)

; Loop over all of the requested stars

  for i = 0, sizex(ids)-1 do begin
  
; Get the 1900 coordinates from the raw HD catalog

    hd	= s[i].hd
    ra_1900		= (hd.rah + (hd.radm * 0.1)/60d ) * (2d*!dpi/24d)			; RA,  B1900, radians
    dec_1900		= (hd.de eq '-' ? -1d : 1d) * $
        ( hd.ded + (hd.dem/60d)) * (2d*!dpi/360d)	; Dec, B1900, radians
    sign_1900	= 1d
    radtohms, ra_1900,        ra_hh_1900,  ra_mm_1900,  ra_ss_1900
    radtodms, dec_1900, sign_1900, dec_dd_1900, dec_mm_1900, dec_ss_1900

; Get the 2000 coordinates, which have already been precessed

    ra	= s[i].ra
    dec	= s[i].dec
    sign	= 1d
    radtohms, ra,        ra_hh,  ra_mm,  ra_ss
    radtodms, dec, sign, dec_dd, dec_mm, dec_ss

; Print out both 1900 and 2000 coordinates

    print
    print, 'HD ' + st(ids[i])

    print, 'RA = ' + st(ra_hh)       + 'h' + st(ra_mm+ra_ss/60d) + $
        ', dec = ' + st(sign*dec_dd) + 'd' + st(dec_mm+dec_ss/60d)  + $
	' (J2000, d:m)'

    print, 'RA = ' + st(ra_hh_1900)       + 'h' + $
        st(ra_mm_1900+ra_ss_1900/60d) + ', dec = ' + $
	st(sign_1900*dec_dd_1900) + 'd' + $
	st(dec_mm_1900+dec_ss_1900/60d)  + ' (B1900, d:m)'

    print, 'RA = ' + st(ra_hh)       + 'h' + st(ra_mm)  + ':' + st(ra_ss) + $
        ', dec = ' + st(sign*dec_dd) + 'd' + st(dec_mm) + ':' + st(dec_ss) + $
	' (J2000, d:m:s)'
    end
 
  stop
end