2121 II/121 Stellar Distribution Near SA 127, SA 141, SA 189 K U Ratnatunga Ph.D. Dissertation, The Australian National University, Canberra ??? ??? 1983 1993 Selected areas Stellar distribution Photographic photometry and 1950 coordinates were determined using Automated Image location on 50 micron aperture PDS scans of the regions on UKSTU Schmidt plates. Galaxy contamination, which is small at these relatively bright apparent magnitudes, has not been removed from the images located. The image locating algorithm does not locate faint stars within 9 seconds of arc of an image of a brighter star on the plate. Assuming uniform random distributions, the estimated incompleteness is 0.5% at magnitude 15 and 2.2% at 17.5.

RAh Right Ascension 1950 (hours) h RAm Right Ascension 1950 (minutes) min RAs Right Ascension 1950 (seconds) In numerous records the seconds are equal to 60 s DE- Declination 1950 (sign) --- DEd Declination 1950 (degrees) deg DEm Declination 1950 (minutes) arcmin DEs Declination 1950 (seconds) arcsec J Photographic J magnitude = V + 0.841*(B-V) mag F Photographic F magnitude = V - 0.605*(B-V) mag C.-H. Lyu Hughes STX/NASA and Francois Ochsenbein CDS 1995May25 UNKNOWN UNKNOWN Data format modified at the Astronomical Data Center (ADC)/NASA GSFC, 1991 October...Wayne H. Warren Jr. Data description (prepared at the ADC/NASA GSFC from separate descriptions supplied by K. U. Ratnatunga, with format description added, 1991 November...WHW). UNKNOWN UNKNOWN Remarks on Plate Information: ----------------------------------------------------------------------------- J = IIIa-J KODAK emulsion + 2mm GG395 Schott glass filter = V + 0.841*(B-V) F = IIIa-F KODAK emulsion + 3mm RG630 Schott glass filter = V - 0.605*(B-V) ----------------------------------------------------------------------------- ---------------------------------------------------------------------------- SA Plate Observation Air Exposure Min Image Sky Back Limiting Number Date Mass Diameter Bright Density Magnitude (min) (microns) (mag) (mag) ---------------------------------------------------------------------------- 127 J7438S 05-JAN-1982 1.05 15 60 20.5 1.27 19.5 127 R7407S 20-DEC-1981 1.22 30 85 20.0 0.90 17.7 141 J7168S 03-JAN-1981 1.00 15 50 21.2 0.44 19.5 141 R6856S 14-NOV-1980 1.17 12 60 21.3 0.40 17.4 189 J7227S 30-SEP-1981 1.14 15 35 21.3 0.34 19.5 189 R7215S 22-SEP-1981 1.16 30 50 20.2 0.74 18.2 ---------------------------------------------------------------------------- Remarks on Field Information: ------------------------------------------------------------ SA l b Field RA (1950) Dec No. stars d d (sq.deg) h m h m d d ------------------------------------------------------------ 127 272 +38 20.9 11 00 to 11 20 -20 to -16 35786 141 245 -86 22.5 01 00 to 01 20 -32 to -37 13612 189 277 -50 20.9 02 50 to 03 30 -62 to -58 31088 ------------------------------------------------------------ Coordinate calibration used positions of SAO stars. Estimated rms accuracy for Best Magnitude range 13.5 < V < 16.0: Visual magnitude 0.05 mag (B-V) color 0.07 mag Positions 1 second of arc *** magnitudes brighter than 12 and fainter than 17.5 inaccurate *** II_121.xml