171P/Spahr
Chart COBS
Credit: COBS Comet Observation Database – CC BY-NA-SA 4.0”
Mag18.40
Coma diameter0.25
Date Brightness Size Notes
2025-10-02 05:02 18.4 0.25 R. Hill, 0.5-m Newtonian + CCD
2025-09-20 08:24 18.9 None J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD
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