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II/183A UBVRI Photometric Standards (Landolt 1992)
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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
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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:
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FileName Lrecl Records Explanations
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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)
table11.dat 19 71 RCA 3103A photomultiplier No N49701
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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)
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Byte-by-byte Description of file: filters.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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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
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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].
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(End) Francois Ochsenbein [CDS], Nancy G. Roman [SDDOO/ADC] 20-Apr-2000