II/121 Stellar Distribution Near SA 127, SA 141, SA 189 (Ratnatunga 1983)
Stellar Distribution Near the Selected Areas 127, 141 and 189
Ratnatunga K.U. 1983
<Ph.D. Dissertation, The Australian National University, Canberra>
ADC_Keywords: Selected Areas, Stellar Distribution
Description:
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sa127 32 35786 SA 127 field
sa141 32 13612 SA 141 field
sa189 32 31088 SA 189 field
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Byte-by-byte Description of file: sa127, sa141, sa189
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension 1950 (hours)
4- 5 I2 min RAm Right Ascension 1950 (minutes)
7- 10 F4.1 s RAs *[0/60] Right Ascension 1950 (seconds)
12 A1 --- DE- Declination 1950 (sign)
13- 14 I2 deg DEd Declination 1950 (degrees)
16- 17 I2 arcmin DEm Declination 1950 (minutes)
19- 20 I2 arcsec DEs *[0/60] Declination 1950 (seconds)
22- 26 F5.2 mag J Photographic J magnitude = V + 0.841*(B-V)
28- 32 F5.2 mag F Photographic F magnitude = V - 0.605*(B-V)
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Note on RAs and DEs:
In numerous records the seconds are equal to 60
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Remarks on Plate Information:
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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)
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SA Plate Observation Air Exposure Min Image Sky Back Limiting
Number Date Mass Diameter Bright Density Magnitude
(min) (microns) (mag) (mag)
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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
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Remarks on Field Information:
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SA l b Field RA (1950) Dec No. stars
d d (sq.deg) h m h m d d
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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
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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 ***
Historical Notes:
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).
References:
Ratnatunga, K.U., and Freeman, K.C. 1985ApJ...291..260R 1985ApJ...291..260R
(End) C.-H. Lyu [Hughes STX/NASA] and Francois Ochsenbein [CDS] 25-May-1995