Landolt Photometric Standards
SDB

• Additional SDB files back to

• Download it! 1,181 objects in SDB

• Enabling object Type Reference Point

• Header used to define the fields

• How to use SDB files with TheSky

• How do I label the fields

• -50 degrees DEC 109 stars

• ReadMe

  Distribution across TheSky
  
  Count = 1,181 objects

Searching the SDB file

Now because the data is compiled using a SEARCH field The SDB file can be searched using Edit | Find by EXPANDING the entry under Sky Database's (SDBs) | Landolt. See below.

Edit | Find

Landolt then number

Pick from the list or you can enter Landolt {SEARCH CRITERIA} directly. If you don't like the Identifier LANDOLT used in searching you change and recompile the data. Best to make the change in the HEADER using the Identifier field.

How do I label the fields?

View | Display Explorer

Sky Databases (SDB's) | Landolt

Place a check next to the fields that you want labeled on the display when Extended Labels are set to visible.

View | Labels

Check Extended Labels

Enabling Object Type Reference Point - Must be enabled to see!

Because the object type for our labels is "Reference Point" they MUST be enabled to show!

Enabling Reference Point

Type Reference Point to get there directly!

Header created to define fields

>SEARCH 1,12
>ALIAS 1,12
>MAGNITUDE 79,84
>RAHOURS 16,17
>RAMINUTES 19,20
>RASECONDS 22,26
>DECSIGN 28,28
>DECDEGREES 29,30
>DECMINUTES 32,33
>DECSECONDS 35,38
>PARSE "Landolt ID" 1,12
>PARSE "s" 40,40
>PARSE "GSC ID" 43,51
>PARSE "HD/DM" 53,64
>PARSE "REMARKS" 67,100
>PARSE " * " 13,13
>IDENTIFIER Landolt
>LOADMEMORY
>OBJECT TYPE 55
;Object Type 55 = Reference Points change if you like. Refer to TheSky manual Appendix A
>CATALOG CLASS=OBJECTS
;
;Landolt           RA(2000) Dec    s         GSC       HD/DM      Remarks
SA 140-84       0 03 38.09 -28 41 47.0 U  6418-1076  CD-29 18942

........... and so on

ReadME

Precise Positions for Landolt Standard Stars
version:  8 June 2002

Landolt's papers:
L73    1973AJ.....78..959L
L83a   1983AJ.....88..439L
L83b   1983AJ.....88..853L
L92    1992AJ....104..340L

position sources:
A   USNO-A2.0  (I/252)
B   Bordeaux meridian circle  (2001A&A...376..325R, I/272)
C   Carlsberg meridian circle  (I/256)
c   CPC2  (1999AJ....117.2895Z, I/265)
G   GSC-ACT  (I/255)
g   GSC-2.2  (I/271)
H   Hipparcos  (1997A&A...323L..49P, I/239)
L   Lick NPM1  (1987AJ.....94..501K, I/199)
M   2MASS second release  (B/2mass/out)
T   Tycho-2  (2000A&A...357..367H, I/259)
U   UCAC1  (2000AJ....120.2131Z, I/268)

An asterisk (*) following the name indicates a note is given in the Notes
file.