332P/Ikeya–Murakami
332P/Ikeya–Murakami photographed by the Hubble Space Telescope in January 2016.[1]
Discovery
Discovered byKaoru Ikeya and Shigeki Murakami
Discovery dateNovember 3, 2010
Designations
2010 V1; 2015 Y2
Orbital characteristics
Epoch2016 Jan. 13[2]
Perihelion1.573 AU (q)
Eccentricity0.4904
Orbital period5.42 yr[2]
Inclination9.387°
Last perihelion2021-Aug-18 (A)[3]
2016 Mar. 17 (A)[2]
2016 Mar. 17 (B)[4]
2010-Oct-13[2]
2005-May
Next perihelion2027-Jan-19? (A)[5]

332P/Ikeya–Murakami (P/2010 V1) is a short-period comet with period of approximately 5.4 years[2] first identified independently by the two Japanese amateur astronomers Kaoru Ikeya and Shigeki Murakami on November 3, 2010.[6][7] Ikeya identified the comet using a 25-centimeter (10-inch) reflector at 39×, while Murakami used a 46 cm (18-inch) reflector at 78×.[6] 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.[6]

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.[8] After the 2010 perihelion passage, the comet only had about an 80-day observation arc.[8]

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.[4] The comet is now composed of component A and B with two different comas, envelopes and tails.[4] 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.

Even fragment A has not been observed since May 2016 and only has a 124 day observation arc.[9]

Comet fragment semimajor axis (AU) perihelion eccentricity inclination M2 approximate size (m) ascending node argument of peri Discovery date
A3.086421.5728830.490399.386919.34703.7827152.4422016/01/02
B3.08341.572870.489899.382420.82403.796152.3782016/01/01
C3.08941.572930.490869.387012.5109003.7810152.4302010/11/03
D3.0831.57140.49049.37919.54303.76152.62016/02/01
E3.091.5730.4919.3922.51103.8152.52016/01/18
F3.151.5850.4969.5122.11303.60152.42016/02/05
G3.061.5510.4949.2720.62603.6154.52016/02/10
H3.08601.572830.490339.385718.95703.786152.4212016/02/05
I3.0831.57300.4909.3821.71603.80152.42016/02/05

References

  1. ↑ "Cosmic Fragments". www.spacetelescope.org. Retrieved 20 September 2016.
  2. 1 2 3 4 5 6 "MPEC 2016-A10 : COMET P/2010 V1 = 2015 Y2 (Ikeya-Murakami)". IAU Minor Planet Center. 2016-01-02. Retrieved 2016-01-12. (PK15Y020)
  3. ↑ "332P/Ikeya-Murakami Orbit". Minor Planet Center. Retrieved 2017-04-10.
  4. 1 2 3 "COMET P/2015 Y2 (IKEYA-MURAKAMI)". Central Bureau for Astronomical Telegrams. 2016-01-05.
  5. ↑ "Horizons Batch for 332P/Ikeya-Murakami-A (90001283) on 2027-Jan-19?" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2021-09-17. (JPL#15 / Soln.date: 2021-Feb-24 / last obs: 2016-05-05)
  6. 1 2 3 Sinnott, Roger (2010-11-04). "New Binocular Comet in the Morning Sky". Sky & Telescope. Archived from the original on 2010-11-10. Retrieved 2010-11-05.
  7. ↑ "Ikeya–Murakami: The New Comet on the Cosmic Block". NASA. November 17, 2010. Retrieved 14 December 2010.
  8. 1 2 Ishiguro, Masateru; Jewitt, David; Hanayama, Hidekazu; Usui, Fumihiko; Sekiguchi, Tomohiko; Yanagisawa, Kenshi; Kuroda, Daisuke; Yoshida, Michitoshi; Ohta, Kouji (2014-05-20). "Outbursting Comet P/2010 V1 (Ikeya-Murakami): A Miniature Comet Holmes". The Astrophysical Journal. 787 (1): 55. arXiv:1404.1630. Bibcode:2014ApJ...787...55I. doi:10.1088/0004-637X/787/1/55. ISSN 0004-637X. S2CID 50869105.
  9. ↑ "JPL Small-Body Database Browser: 332P/Ikeya-Murakami-A" (2016-05-05 last obs). Retrieved 2021-09-17.
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