332P/Ikeya–Murakami

Ikeya identified the comet using a 25-centimeter (10-inch) reflector at 39×, while Murakami used a 46 cm (18-inch) reflector at 78×.^[10] Photographic confirmation of the comet was obtained by Ernesto Guido and Giovanni Sostero using a Global-Rent-a-Scope (GRAS) telescope in New Mexico. Both Ikeya and Murakami discovered the comet using manual observation through optical telescopes. Such visual discoveries have become rare in recent years.^[10]

At the start of November 2010, a few weeks past perihelion passage, it was discovered the comet had undergone a major outburst between October 31 and November 3.^[12] After the 2010 perihelion passage, the comet only had about an 80-day observation arc.^[12]

The recovery of P/2010 V1 on December 31, 2015, at magnitude 20 was announced on January 2, 2016, and designated as P/2015 Y2.^[2] A secondary fragment (B) was confirmed and announced on January 5, 2016.^[13] The comet is now composed of component A and B with two different comas, envelopes and tails.^[13] Around January 11, 2016, two fainter potential fragments, designated P/2010 V1-C and P/2010 V1-D have been located, both likely having been fragmented from P/2010 V1-B. As of January 29, fragments B and D had nearly entirely disintegrated, and fragment C had undergone an outburst, making it as bright as P/2010 V1-A.

Fragment–A has a 124-day observation arc,^[3] and fragment–F has the poorest orbit determination as it has a short arc of only 11-days.^[7] Most of the fragments are estimated to have an orbital period of about 1980 days. Fragment–F is estimated to have a longer orbital period of around 2050 days. After two orbits (11 years) of becoming divergent, fragment–F is estimated to come to perihelion 4 months and 18 days after fragment–A.

• 73P/Schwassmann–Wachmann
• 141P/Machholz