45P/Honda–Mrkos–Pajdušáková
Comet Honda–Mrkos–Pajdušáková on February 10, 2017
Discovery
Discovered byMinoru Honda
Discovery dateDecember 3, 1948
Orbital characteristics
Epoch2011-Jun-08
(JD 2455720.5)
Aphelion5.511 AU
Perihelion0.5296 AU
Semi-major axis3.0205 AU
Eccentricity0.8246
Orbital period5.25 yr
Inclination4.257°
Last perihelionApril 26, 2022[1]
December 31, 2016[2]
September 28, 2011[3]
June 29, 2006[4][5]
March 29, 2001
December 25, 1995
Next perihelion2027-Aug-31[6]
Earth MOID0.06 AU (9,000,000 km)[3]
Jupiter MOID0.106 AU (15,900,000 km)[3]
Physical characteristics
Dimensions1.3 km[7]

45P/Honda–Mrkos–Pajdušáková is a short-period comet discovered by Minoru Honda December 3, 1948.[8] It is named after Minoru Honda, Antonín Mrkos, and Ľudmila Pajdušáková. The object revolves around the Sun on an elliptical orbit with a period of 5.25 years.[3] The nucleus is 1.3 kilometers in diameter.[7] On August 19 and 20, 2011, it became the fifteenth comet detected by ground radar telescope.[9]

During the 1995 perihelion passage, the comet was visible to Solar and Heliospheric Observatory (SOHO) on January 16, 1996, when the comet was around apparent magnitude 7 and 4.3° from the Sun.[8]

It is green because it emits diatomic carbon which glows green in the near vacuum of space.[10]

2011 passage

During the 2011 perihelion passage, the comet was recovered on 5 June at magnitude 21.[11] On 8 July, the comet had a magnitude of approximately 18,[12] and, as of 22 July, nuclear condensation was noticed around magnitude 16.[13] It was expected to reach a peak magnitude of around 7.3 in late September near perihelion.[14]

On August 15, 2011, the comet made a close approach of only 0.0600 AU (8,980,000 km; 5,580,000 mi) from the Earth[15][16][17] and it was studied by the Goldstone Deep Space Network.[18] Radar observations on August 19 and 20 detected echoes from the nucleus and coma.[9]

2017 passage

45P/Honda–Mrkos–Pajdušáková came to perihelion on December 31, 2016.[3] By February 4, 2017, it was around magnitude 7 and the coma was about 100,000 km across.[19] The comet required binoculars to be seen because of the low surface brightness.[20] The comet passed 0.08318 AU (12,444,000 km; 7,732,000 mi) from Earth on February 11, 2017, which was the same day as a lunar eclipse.[16][21]

This shows the path of the comet during August 2011, with daily motion drawn as spheres, scaled for relative distance from earth.
The next notable close approach to Earth will occur in October 2032[16]
This shows the path of the comet during January through March 2017, with daily motion drawn as spheres, scaled for relative distance from earth.

The next notable close approach will be in October 2032[16] when the comet might brighten to magnitude 7.

August Delta Capricornids

On 16 August 2022 the global CAMS and Sonotaco network detected a modest outburst of meteors with an orbit that resembled comet 45P.[22] The shower received the temporary designation of M2022-Q1, and was later permanently named the August Delta Capricornids.[23] The meteors had an entry speed of 24.4 km/s and originated from the border of Aquarius and Capricornus with R.A. 21:40 and a declination of –11.9°.[22] This was the first time an encounter with a dust trail of 45P has been confirmed and it came from the 1980 meteoroid stream of 45P.[23] In all, 137 meteors were triangulated by the global CAMS networks.

References

  1. ↑ MPC
  2. ↑ Syuichi Nakano (September 10, 2011). "45P/Honda-Mrkos-Pajdusakova (NK 2118)". OAA Computing and Minor Planet Sections. Retrieved February 18, 2012.
  3. 1 2 3 4 5 "JPL Small-Body Database Browser: 45P/Honda-Mrkos-Pajdusakova". Jet Propulsion Laboratory. Archived from the original on 2012-12-13. Retrieved 24 December 2015. last obs. used: 2012-04-12
  4. ↑ Seiichi Yoshida (2007-04-19). "45P/Honda-Mrkos-Pajdusakova". Seiichi Yoshida's Comet Catalog. Retrieved March 1, 2010.
  5. ↑ Syuichi Nakano (2006-06-30). "45P/Honda-Mrkos-Pajdusakova (NK 1357)". OAA Computing and Minor Planet Sections. Retrieved March 1, 2010.
  6. ↑ "Horizons Batch for 45P/Honda-Mrkos-Pajdusakova (90000533) on 2027-Aug-31" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 2022-06-18. Retrieved 2022-07-06. (JPL#K222/7 Soln.date: 2022-Jul-19)
  7. 1 2 "Arecibo Observatory captures revealing images of Comet 45P/Honda-Mrkos-Pajdusakova". Universities Space Research Association (USRA). Archived from the original on 2017-02-18. Retrieved 2017-02-17.
  8. 1 2 "45P/Honda-Mrkos-Pajdusakova". Gary W. Kronk's Cometography. Retrieved 2007-03-25.
  9. 1 2 "Goldstone Radar Detection of Comet HMP (Honda–Mrkos–Pajdušáková)". NASA/JPL Asteroid Radar Research. Retrieved September 28, 2011.
  10. ↑ "Green Comet Approaches Earth". Spaceweather.com. Archived from the original on 13 February 2017. Retrieved 14 February 2017.
  11. ↑ "MPEC 2011-L51 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. June 12, 2011. Retrieved June 13, 2011.
  12. ↑ "MPEC 2011-N34 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. July 8, 2011. Retrieved July 9, 2011.
  13. ↑ "MPEC 2011-O24 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. July 22, 2011. Retrieved July 23, 2011.
  14. ↑ "Elements and Ephemeris for 45P/Honda-Mrkos-Pajdusakova". minorplanetcenter.net. Comet Ephemeris Service at the IAU Minor Planet Center. Archived from the original on June 17, 2016. Retrieved July 23, 2011. (0045P)
  15. ↑ JPL Epoch 2012-May-13 solution
  16. 1 2 3 4 "JPL Close-Approach Data: 45P/Honda-Mrkos-Pajdusakova". Archived from the original on 2012-12-13. Retrieved 24 December 2015. last obs. used: 2012-04-12
  17. ↑ "Comet Orbit Home Page". Kazuo Kinoshita. Retrieved 2007-03-25.
  18. ↑ Dr. Lance A. M. Benner (July 22, 2011). "45P Honda-Mrkos-Pajdusakova Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved July 22, 2011.
  19. ↑ Comets and Asteroids
  20. ↑ Dr. Lance A. M. Benner. "Goldstone Radar Observations Planning: comet 45P/Honda-Mrkos-Pajdusakova, 2015 BN509, 2017 BW, 2013 WT67, 2017 BQ6, 2013 FK, and 2017 BY93". NASA/JPL Asteroid Radar Research. Retrieved 2017-02-09.
  21. ↑ St. Fleur, Nicholas (February 9, 2017). "Lunar Eclipse and Green Comet Make for Busy Friday Night in the Sky - Trilobites". The New York Times. Retrieved February 10, 2017.
  22. 1 2 Takashi Sekiguchi (2022-08-18). "New radiant on Aquarius/Capricorn border by the SonotaCo Network". MeteorNews. Retrieved 2022-08-19.
  23. 1 2 Peter Jenniskens (2022-08-26). "August delta Capricornids meteor shower 2022". MeteorNews. Retrieved 2022-08-26.
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