Astrometric Calibration of the Beijing-Arizona Sky Survey

Xiyan Peng, Zhaoxiang Qi, Tianmeng Zhang, Zhenyu Wu, Zhimin Zhou, Jundan Nie, Hu Zou, Xiaohui Fan, Linhua Jiang, Ian McGreer, Jinyi Yang, Arjun Dey, Jun Ma, Jiali Wang, David Schlegel, Xu Zhou

Research output: Contribution to journalArticlepeer-review


We present the astrometric calibration of the Beijing-Arizona Sky Survey (BASS). The BASS astrometry was tied to the International Celestial Reference Frame via the Gaia Data Release 2 reference catalog. For effects that were stable throughout the BASS observations, including differential chromatic refraction and the low charge transfer efficiency of the CCD, we corrected for these effects at the raw image coordinates. Fourth-order polynomial intermediate longitudinal and latitudinal corrections were used to remove optical distortions. The comparison with the Gaia catalog shows that the systematic errors, depending on color or magnitude, are less than 2 milliarcseconds (mas). The position systematic error is estimated to be about −0.01 ± 0.7 mas in the region between 30° and 60° of decl. and up to −0.07 ± 0.9 mas in the region north of decl. 60°.

Original languageEnglish (US)
Article number172
JournalAstronomical Journal
Issue number4
StatePublished - Apr 1 2023

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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