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Title: 45P/Honda–Mrkos–Pajdušáková  
Author: World Heritage Encyclopedia
Language: English
Subject: C/2010 X1, Comets, 208P/McMillan, Antitail, C/2002 T7 (LINEAR)
Collection: Astronomical Objects Discovered in 1948, Comets, Periodic Comets
Publisher: World Heritage Encyclopedia


Discovered by Minoru Honda
Discovery date December 3, 1948
Orbital characteristics A
Epoch 2011-Jun-08
(JD 2455720.5)
Aphelion 5.511 AU
Perihelion 0.5296 AU
Semi-major axis 3.0205 AU
Eccentricity 0.8246
Orbital period 5.25 yr
Inclination 4.257°
Last perihelion September 28, 2011[1]
June 29, 2006[2][3]
March 29, 2001
December 25, 1995
Next perihelion 2016-Dec-31[4]

45P/Honda–Mrkos–Pajdušáková is a short-period comet discovered by Minoru Honda December 3, 1948.[5] The comet is named after Minoru Honda, Antonín Mrkos, and Ľudmila Pajdušáková. The comet is on an elliptical orbit with a period of 5.26 years.[1] The comet nucleus is estimated to be 0.5-1.6 kilometers in diameter.[1][6] During the 2011 perihelion passage the comet was recovered on 5 June 2011 at apparent magnitude 21.[7] On 8 July 2011 the comet had a magnitude of approximately 18,[8] and as of 22 July 2011 the comet's nuclear condensation had a magnitude of approximately 16.[9] The comet is expected to reach a peak magnitude of around 7.3 in late September when it is near perihelion.[10]

The comet made a close approach of only 0.0600 AU (8,980,000 km; 5,580,000 mi) from the Earth on August 15, 2011,[11][12] and was studied by the Goldstone Deep Space Network on August 19 and 20.[6] Goldstone radar observations on 2011 August 19 and 20 detected echoes from the nucleus and coma.[13] This is only the fifteenth comet that has been detected with radar.[13] The comet will also pass close to Earth on February 11, 2017.[11]

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.[5]


  1. ^ a b c "JPL Small-Body Database Browser: 45P/Honda-Mrkos-Pajdusakova". Jet Propulsion Laboratory. 2011-06-12 last obs. Retrieved 2011-06-11. 
  2. ^ Seiichi Yoshida (2007-04-19). "45P/Honda-Mrkos-Pajdusakova". Seiichi Yoshida's Comet Catalog. Retrieved 2010-03-01. 
  3. ^  
  4. ^  
  5. ^ a b "45P/Honda-Mrkos-Pajdusakova". Gary W. Kronk's Cometography. Retrieved 2007-03-25. 
  6. ^ a b Dr. Lance A. M. Benner (2011-07-22). "45P Honda-Mrkos-Pajdusakova Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved 2011-07-22. 
  7. ^ "MPEC 2011-L51 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. 2011-06-12. Retrieved 2011-06-13. 
  8. ^ "MPEC 2011-N34 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. 2011-07-08. Retrieved 2011-07-09. 
  9. ^ "MPEC 2011-O24 : OBSERVATIONS AND ORBITS OF COMETS". IAU Minor Planet Center. 2011-07-22. Retrieved 2011-07-23. 
  10. ^ "Elements and Ephemeris for 45P/Honda-Mrkos-Pajdusakova". Comet Ephemeris Service @ IAU Minor Planet Center. Retrieved 2011-07-23.  (0045P)
  11. ^ a b "JPL Close-Approach Data: 45P/Honda-Mrkos-Pajdusakova". 2011-06-08 last obs. Retrieved 2011-06-11. 
  12. ^ "Comet Orbit Home Page". Kazuo Kinoshita. Retrieved 2007-03-25. 
  13. ^ a b "Goldstone Radar Detection of Comet HMP (Honda–Mrkos–Pajdušáková)". NASA/JPL Asteroid Radar Research. Retrieved 2011-09-28. 

External links

  • Orbital simulation from JPL (Java) / Horizons Ephemeris
  • Elements and Ephemeris for 45P/Honda-Mrkos-Pajdusakova – Minor Planet Center
  • 45P/Honda-Mrkos-Pajdusakova / 2011 – Seiichi Yoshida @
  • 45P/Honda-Mrkos-Pajdušáková @ Royal Astronomical Society of New Zealand
  • 45P/Honda-Mrkos-Pajdusakova 2001 passage at Astrosite Groningen (magnitude and coma estimates)
  • 45P/H-M-P as seen by STEREO HI2A Comet Al (September 29, 2011)
  • 45P as seen by STEREO-A HI-2
  • 45P as seen on 2011-Jul-27 by Ernesto Guido, Giovanni Sostero & Nick Howes (GRAS 0.51m f/6.9 reflector)
  • Michael Jäger color photo of 45P/Honda on 2011-09-29
  • 45P as seen by SOHO on 1996/01/16 00:58 (visible half way between the Sun and the top of the frame)
Periodic comets (by number)
45P/Honda–Mrkos–Pajdušáková Next
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