I/199A Lick Northern Proper Motion Program: NPM1 Catalog (Klemola+ 1987)
Lick Northern Proper Motion Program: NPM1 Catalog
Klemola A.R., Hanson R.B., Jones B.F.
<Astron. J. 94, 501 (1987)>
=1987AJ.....94..501K 1987AJ.....94..501K
ADC_Keywords: Positional data ; Proper motions ;
Magnitudes, photographic ; Colors ; Cross identifications
Description:
The NPM1 catalog is the first part of the Lick Northern Proper Motion
(NPM) program to measure absolute proper motions, on an inertial
system defined by some 50,000 faint galaxies, for some 300,000 stars
over a blue apparent magnitude range from 8 to 18. There are 1246
6-degree by 6-degree fields in the NPM survey (to declination -23
degrees). The NPM1 catalog covers the 72% of the northern sky lying
outside the Milky Way and contains some 149,000 stars from measures in
899 of the 1246 NPM fields. A second catalog (NPM2) will cover the NPM
Milky Way fields. The Yale Southern Proper Motion (SPM) program will
complete the southern sky. Each NPM field was photographed at two
epochs between 1947 and 1988. The mean first and second epochs are
1950 and 1977; the average epoch difference is 27 years. The
first-epoch plates were taken in the blue only; both blue and yellow
plates were taken at the second epoch. Some 94000 stars were chosen
anonymously for the NPM astrometric reductions and for statistical
studies of stellar motions. In addition, the NPM1 catalog contains
some 28000 positional reference stars, and some 27000 stars were
chosen from the Lick Input Catalog of Special Stars (ICSS).
The previous version of the NPM1 Catalog (I/199) deposited with the
data centers (ADC and CDS) gives positions for equinox B1950 and
computed epoch 1950, and is in one data file (148,940 lines)
concatenating the 114 one-degree declination zones from +90 degrees to
-23 degrees. Each star has an NPM1 "name" reflecting the declination
zone and a running number in right ascension order within the zone.
The present J2000 version gives the NPM1 positions transformed into
the J2000 system and updated to the epoch 2000 using the NPM1 proper
motions. The proper motions have been rotated into the J2000
coordinate system.
The J2000 NPM1 Catalog is ordered in zones from +90 degrees to -23
degrees, and within each zone, the stars are sorted in right ascension
order. To avoid "renaming" stars, the B1950 NPM1 "names" were
retained, but the user must note that these no longer strictly reflect
the declination zone and right ascension order in the J2000 NPM1
Catalog. The J2000 NPM1 Catalog is also available as 114 separate
files, one for each declination zone from +90 degrees (z+90j) to -23
degrees (z-23j), from http://www.ucolick.org/~npm/NPM1/zones/
Each star's entry includes the absolute proper motion and blue
magnitude. For 97% of the stars the color is also given. Other data
given for each star are: the original mean epoch, a stellar class
code, the number of NPM fields measured, and discrepancy flags for
position, proper motion, and photometry. Finally, as an additional
identification, the AGK3 (north) or SAO (south) number (if any) is
given. The rms errors of the NPM absolute proper motions are about
0.5"/cent in each coordinate. The rms position errors at the catalog
epoch 1950 average about 0.15" in each coordinate. The rms errors for
the NPM photographic photometry average about 0.2 mag in B, and 0.15
mag in B-V.
More complete information is available in the PostScript documentation
for the 1993 (B1950) NPM1 Catalog (npm1b.ps), written by R.B. Hanson.
We thank the National Science Foundation for its continued support of
the NPM program. Recent work was supported by NSF grant AST-9530632.
Current work is supported by NSF grant AST-9988105.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
npm1j.dat 84 148940 The J2000 Catalogue
npm1b.ps 73 1674 PostScript documentation (of B1950 version)
--------------------------------------------------------------------------------
See also:
http://www.ucolick.org/~npm/NPM1/ : the NPM1 Catalog at Lick Observatory
I/200 : Lick Northern Proper Motion: NPM1 Ref. Galaxies (Klemola+ 1987)
I/214 : NPM1 Cross Index (Klemola+ 1994)
I/283 : Lick NPM2 Catalog Version (Hanson+ 2002)
Byte-by-byte Description of file: npm1j.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name [0-9.±]! NPM1 star "name" made of:
Byte 1 : Sign of B1950 declination for
this zone
Bytes 2-3: B1950 Declination zone
Bytes 4-8: Running number in this
B1950 declination zone
10- 11 I2 h RAh Right Ascension J2000, Ep=J2000 (hours)
13- 14 I2 min RAm Right Ascension J2000, Ep=J2000 (minutes)
16- 21 F6.3 s RAs Right Ascension J2000, Ep=J2000 (seconds)
23 A1 --- DE- Declination J2000, Ep=J2000 (sign)
24- 25 I2 deg DEd Declination J2000, Ep=J2000 (degrees)
27- 28 I2 arcmin DEm Declination J2000, Ep=J2000 (minutes)
30- 34 F5.2 arcsec DEs Declination J2000, Ep=J2000 (seconds)
35- 42 F8.2 10mas/yr pmRA Absolute proper motion RA (in "/century)
43- 50 F8.2 10mas/yr pmDE Absolute proper motion Dec. (in "/century)
51- 56 F6.2 mag Bmag Photographic photometry (B magnitude)
57- 62 F6.2 mag B-V *?=-9.99 Photographic photometry (B-V color)
63- 68 F6.2 yr Ep-1900 Original mean epoch of position (-1900)
69- 70 I2 --- class *[1,7] Code for class of star
71- 72 I2 --- Nfld Number of NPM fields on which star was measured
74 I1 --- ips *Discrepancy flag Position
75 I1 --- ipm *Discrepancy flag Proper Motion
76 I1 --- ibv *Discrepancy flag Photometry
77- 83 I7 --- icatno *AGK3 or SAO identification
84 A1 --- agks *AGK catalog zone change
--------------------------------------------------------------------------------
Note on B-V:
(= -9.99 if no data)
Note on class:
The code is a sum of the following numbers, if applicable.
+1 if anonymous star (faint or bright)
+2 if catalog star (AGK3 or SAO)
+4 if other star (Lick Input Catalog)
Note on ips, ipm and ibv:
As defined in Table 2 of the Document file (npm1.txt)
----------------------------------------------------
Position Proper Motion Photometry
----------------------------------------------------
Flag=0 O.K. O.K. O.K.
Flag=1 R.A. R.A. B
Flag=2 Dec. Dec. B - V
Flag=3 Both Both Both
Flag=9 Error Error Error
----------------------------------------------------
Limits 1.0 arcsec 3.0 arcsec/centy 1.0 mag
Note on icatno:
AGK3 identification for zones +89 to -01 (Cat. I/61)
SAO identification for zones -02 to -23 (Cat. I/131)
Note on agks:
blank if AGK zone = NPM zone
+ if AGK zone = NPM zone + 1
- if AGK zone = NPM zone - 1
--------------------------------------------------------------------------------
History:
* The first version (Cat. I/199) gives positions for equinox B1950 and
computed epoch 1950; it was received at ADC in July 1993, and the
documentation was prepared by Robert B. Hanson (Lick Observatory) in
interaction with Paul Kuin (NSSDC/ADC).
* The second version (Cat. I/199A) giving positions for equinox and
epoch J2000 was prepared in May 2000 at Lick Observatory; it was
incorporated in CDS collection in November 2003.
(End) Robert B. Hanson [Lick Observatory] 2000-May-30