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II/183A          UBVRI Photometric Standards              (Landolt  1992)

UBVRI Photometric Standard Stars in the Magnitude Range 11.5 < V < 16.0 around the Celestial Equator Landolt A.U. <Astron. J. 104, 340 (1992)> =1992AJ....104..340L
ADC_Keywords: Photometry, sequences ; Photometry, UBVRI Description: UBVRI photoelectric observations have been made on the Johnson-Kron-Cousins photometric system of 526 stars centered on the celestial equator. The program stars within a 298 number subset have sufficient measures that they are capable of providing, for telescopes of intermediate and large size in both hemispheres, an internally consistent homogeneous broadband standard photometric system around the sky. The stars average 29 measures each on 19 nights. The majority of the stars in this paper fall in the magnitude range 11.5 < V < 16.0, and in the color range -0.3 < (B-V) < +2.3. Note: Tables 6 to 10 (filter sensitivities) were grouped into the "filters" file. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 124 526 Standard Stars filters.dat 40 676 Transmission Curves of CTIO's filter set No 3 (tables 6 to 10 of the paper) table11.dat 19 71 RCA 3103A photomultiplier No N49701
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Star *Star Designation 13- 14 I2 h RAh Right Ascension J2000 (hours) 16- 17 I2 min RAm Right Ascension J2000 (minutes) 19- 20 I2 s RAs Right Ascension J2000 (seconds) 22 A1 --- DE- Declination J2000 (sign) 23- 24 I2 deg DEd Declination J2000 (degrees) 26- 27 I2 arcmin DEm Declination J2000 (minutes) 29- 30 I2 arcsec DEs Declination J2000 (seconds) 33- 38 F6.3 mag Vmag V magnitude 40- 45 F6.3 mag B-V B-V color 47- 52 F6.3 mag U-B U-B color 54- 59 F6.3 mag V-R V-R color 61- 66 F6.3 mag R-I R-I color 68- 73 F6.3 mag V-I V-I color 75- 77 I3 --- o_Vmag Number of observations 79- 81 I3 --- Nd Number of nights 84- 89 F6.4 mag e_Vmag Mean error of the Mean Vmag 91- 96 F6.4 mag e_B-V Mean error of the Mean (B-V) 98-103 F6.4 mag e_U-B Mean error of the Mean (U-B) 105-110 F6.4 mag e_V-R Mean error of the Mean (V-R) 112-117 F6.4 mag e_R-I Mean error of the Mean (R-I) 119-124 F6.4 mag e_V-I Mean error of the Mean (V-I)
Note on Star: TPHE = stars in the vicinity of T Phe ; (note that TPHE B = SW Phe) F = Feige PG = Palomar Green Two numbers indicate the "Durchmusterung of Selected Areas" (Harvard Annals 101)
Byte-by-byte Description of file: filters.dat
Bytes Format Units Label Explanations
2- 5 I4 0.1nm Lambda Wavelength (Angstroems) 7- 12 F6.2 % T(U) ? Transmission in U filter 14- 19 F6.2 % T(B) ? Transmission in B filter 21- 26 F6.2 % T(V) ? Transmission in V filter 28- 33 F6.2 % T(R) ? Transmission in R filter 35- 40 F6.2 % T(I) ? Transmission in I filter
Byte-by-byte Description of file: table11.dat
Bytes Format Units Label Explanations
2- 5 I4 0.1nm Lambda Wavelength 7- 12 F6.2 mA/W AS Absolute sensitivity of RCA 3103A PM 14- 19 F6.2 % QE Quantum efficiency
History: * 03-Aug-1992: first version received from Arlo Landolt at CDS * 15-Feb-1995: description and documentation standardized by Nancy G. Roman [SDDOO/ADC] * 20-Apr-2000: a problem with a discrepancy in the star coordinates between the printed and electronic versions of table2 was reported by Grzegorz Pojmanski (Warsaw Uniwersity Astronomical Observatory) A new version with the correct positions of the stars in table2 was kindly forwarded by Arlo Landolt to Francois Ochsenbein [CDS]. * 10-Feb-2012: the red star named "92 235" (00:53:16+00:36:18) shows a photometry which corresponds to SA 92-312 = BD+00 135 located 12'North at 00:53:16.5+00:48:29 [CDS].
(End) Francois Ochsenbein [CDS], Nancy G. Roman [SDDOO/ADC] 20-Apr-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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