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. =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. 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 2000 (hours) 16- 17 I2 min RAm Right Ascension 2000 (minutes) 19- 20 I2 s RAs Right Ascension 2000 (seconds) 22 A1 --- DE- Declination 2000 (sign) 23- 24 I2 deg DEd Declination 2000 (degrees) 26- 27 I2 arcmin DEm Declination 2000 (minutes) 29- 30 I2 arcsec DEs Declination 2000 (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) -------------------------------------------------------------------------------- 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]. ================================================================================ (End) Francois Ochsenbein [CDS], Nancy G. Roman [SDDOO/ADC] 20-Apr-2000