Astrometric Analysis of Double Star Systems HD 202, HD 224727, and HD 165747

Abstract

The objective of this study was to measure the position angle (θ) and separation (ρ) of three double-star systems: HD 202 (WDS 00068-2106 RSS 41), HD 165747 (WDS 18089-3115 B 2855), and HD 224727 (WDS 00003-0257 DVG 8). We chose these stars due to the lack of existing observations or the date of the last observation using Stelle Doppie. We used the Siding Spring Observatory in New South Wales, Australia, and the Teide Observatory in the Canary Islands. The position angle (θ) and separation (ρ) were measured using AstroImageJ. Average values, standard deviations, and error measurements were calculated from these measurements, and compared to historical data from the US Naval Observatory. HD 164747 appears to be in an orbit based on the graph, but the separation of the stars, 0.4625±0.0490 pc, indicates they are probably too widely separated. HD 202 appears to be a proper motion pair. HD 224747 may be a binary system but this conclusion relies on a single outlying data point.