Comet Hartley–Good, formally designated as C/1985 R1, is a non-periodic comet that was observed from September 1985 to March 1986. It is the sixth comet discovered overall by Malcolm Hartley and the only one for A. R. Good.
Physical characteristics Ground observations from the comet reveal the presence of organic molecules like CN, CH, and within its coma. In comparison to comets like 21P/Giacobini–Zinner, the dust-to-gas production ratio for Hartley–Good is relatively low, noting that its dust production is inversely proportional to its distance from the Sun.
Narrow-band photometry measurements reveal that the nucleus of Hartley–Good has an effective radius of roughly , however this was later revised to km. Recorded light-curve data from the comet suggests that water ice from its surface had started to sublimate at a distance of from the Sun, while also remaining active throughout its most recent apparition.
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