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This investigation selected a double star system: ES1144 (also known as HD67007A and HD67007B), which is an eclipsing binary and member of a quadruple star system. We report on our observations and measurements of position angle and separation using images taken with Las Cumbres Observatory telescopes. We found a separation of 6.7 arcsec and a position angle of 337°. We conclude that more observations will be required to establish the orbit of the system. 

We report the measurement of the position angle and separation for the double star system HD 80460. We made use of a 0.4m telescope from Las Cumbres Observatory (LCOGT) and a DeltaRho 350 + QHY600 camera. An analysis was made with the historical data from the Washington Double Star (WDS) catalog. A search was made with SIMBAD for spectral type, parallax, and proper motion for the double star. 

We report on our observations of the double star system WDS23516+0814 (CHE 506, HD 223638). We selected a double star system with a few historical observations to contribute to the determination of its possible orbit. 

This paper presents the results of a confirmatory factor analysis on two self-efficacy scales designed to probe the self-efficacy of college-level introductory astronomy (Astro-101) students (n ¼ 1381) from 22 institutions across the United States of America and Canada. The students undertook a course based on similar curriculum materials, which involved students using robotic telescopes to support their learning of astronomical concepts covered in the “traditional” Astro-101 courses. Previous research by the authors using these self-efficacy scales within a pre-/post-test approach showed both high reliabilities and very high construct validities. However, the scale purporting to measure students’self-efficacy in relation to their use of the astronomical instrumentation associated with online robotic telescopes was particularly skewed and required further investigation. This current study builds on the previous work and shows how a slight adjustment of the survey items presents an improved and robust scale for measuring self-efficacy.