J/ApJS/282/44 Secondary standards J and K MKO photometry (Gorski+, 2026) ================================================================================ Secondary standards in the UKIRT faint standard fields. Gorski M., Pietrzynski G., Karczmarek P., Hajdu G., Kicia M., Kaluszynski M., Eimer J.R., Smee S.A., Zgirski B., Wielgorski P., Narloch W. =2026ApJS..282...44G ================================================================================ ADC_Keywords: Photometry, infrared; Stars, standard Keywords: Astronomical methods Abstract: We present precise J- and K-band photometric measurements for 128 near-infrared (NIR) secondary standard stars, located in the 19 United Kingdom Infrared Telescope/Maunakea Observatories (UKIRT/MKO) primary faint standard fields. The data were collected over more than 50 nights, covering a decade of observations between 2008 and 2018 at the ESO La Silla Observatory, using the New Technology Telescope equipped with the SOFI NIR camera. Presented magnitudes are calibrated onto the MKO photometric system. The J- and K-band magnitudes range from 10 to 15.8 mag, with median values of J=13.5mag and K=13mag. The selection process ensured high photometric quality, with a precision better than 0.01 mag for all stars. The catalog excludes stars with close neighbors, high proper motion, or variable stars. Using these fields for standardization can improve the precision and accuracy of photometric calibrations without increasing the observational time cost. Description: Data were collected over more than 50 nights, covering a decade of observations between 2008 and 2018 at the ESO La Silla Observatory, using the New Technology Telescope (NTT) equipped with the SOFI NIR camera. Using the Large Field mode of the instrument, its field of view was 4.9'x4.9' with a pixel scale of 0.288"/pix. The observations were obtained during 18 observing runs carried out under multiple ESO proposals dedicated to the study of Cepheids and eclipsing binaries in the Magellanic Clouds. Observations were performed using the dithering technique. See Section 2. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 89 127 *Photometry of the secondary standard stars in the 19 standard star field -------------------------------------------------------------------------------- Note on table3.dat: One star has been removed from the list of 128 observed stars, bringing the total number of secondary standard stars to 127. -------------------------------------------------------------------------------- See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006) II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012) I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) J/AJ/123/789 : ARAUCARIA project: NGC 300 Cepheid var. (Pietrzynski+, 2002) J/MNRAS/373/781 : JHK photometry of faint standard stars (Leggett+, 2006) J/AJ/154/263 : NIR photometry of 77 RR Lyrae stars (Karczmarek+, 2017) J/MNRAS/493/2568 : Faint Standards for UKIDSS and VISTA ZYJHK (Leggett+, 2020) J/ApJS/253/42 : The Araucaria Project: deep NIR phot. I. (Karczmarek+, 2021) Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 A12 --- Name Source identifier 14- 15 I2 h RAh Hour of Right Ascension (J2000) 17- 18 I2 min RAm Minute of Right Ascension (J2000) 20- 24 F5.2 s RAs Second of Right Ascension (J2000) 26 A1 --- DE- Sign of the Declination (J2000) 27- 28 I2 deg DEd Degree of Declination (J2000) 30- 31 I2 arcmin DEm Arcmin of Declination (J2000) 33- 37 F5.2 arcsec DEs Arcsecond of Declination (J2000) 39- 44 F6.3 mag Jmag [10.59/15.86] Median MKO J band apparent magnitude 46- 50 F5.3 mag e_Jmag [0.003/0.011] Uncertainty in Jmag 52- 53 I2 --- o_Jmag [5/26] Number of epochs in Jmag 55- 60 F6.3 mag Kmag [10.06/15.22] Median MKO K band apparent magnitude 62- 66 F5.3 mag e_Kmag [0.003/0.011] Uncertainty in Kmag 68- 69 I2 --- o_Kmag [5/26] Number of epochs in Kmag 71- 89 I19 --- Gaia Gaia DR3 identifier -------------------------------------------------------------------------------- History: From electronic version of the journal Acknowledgements: Marek Gorski [mgorski at camk.edu.pl] License: CC-BY-4.0 ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Jul-2026