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TOPIC: Comet 17P/Holmes


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Comet 17P/Holmes is at Opposition (4.122 AU) on the 23rd March 2018.



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Comet 17P/Holmes is at Opposition (3.384 AU) on the 1st February 2016



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Comet 17P/Holmes
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ATel 7062: Dust Trail of Comet 17P/Holmes



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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 01 25    04 04 14.7 +42 57 37   2.3622  2.9849   120.5    16.5  19.0
2015 01 26    04 04 33.8 +42 49 15   2.3772  2.9892   119.6    16.6  19.0
2015 01 27    04 04 54.7 +42 40 58   2.3924  2.9936   118.8    16.8  19.0
2015 01 28    04 05 17.1 +42 32 48   2.4076  2.9979   117.9    16.9  19.1
2015 01 29    04 05 41.2 +42 24 43   2.4230  3.0022   117.1    17.0  19.1
2015 01 30    04 06 06.9 +42 16 44   2.4385  3.0065   116.2    17.1  19.1
2015 01 31    04 06 34.1 +42 08 52   2.4542  3.0108   115.4    17.2  19.1
2015 02 01    04 07 02.8 +42 01 05   2.4699  3.0152   114.5    17.3  19.2
2015 02 02    04 07 33.1 +41 53 25   2.4858  3.0195   113.7    17.4  19.2
2015 02 03    04 08 04.8 +41 45 51   2.5018  3.0238   112.8    17.5  19.2
2015 02 04    04 08 38.0 +41 38 23   2.5178  3.0281   112.0    17.6  19.2
2015 02 05    04 09 12.6 +41 31 01   2.5340  3.0324   111.1    17.6  19.2
2015 02 06    04 09 48.6 +41 23 46   2.5503  3.0368   110.3    17.7  19.3
2015 02 07    04 10 25.9 +41 16 36   2.5667  3.0411   109.5    17.8  19.3
2015 02 08    04 11 04.6 +41 09 33   2.5831  3.0454   108.6    17.9  19.3
2015 02 09    04 11 44.6 +41 02 36   2.5997  3.0497   107.8    17.9  19.3
2015 02 10    04 12 25.9 +40 55 45   2.6164  3.0540   107.0    18.0  19.4
2015 02 11    04 13 08.4 +40 49 00   2.6331  3.0583   106.2    18.1  19.4
2015 02 12    04 13 52.2 +40 42 21   2.6499  3.0626   105.3    18.1  19.4
2015 02 13    04 14 37.2 +40 35 48   2.6668  3.0670   104.5    18.2  19.4
2015 02 14    04 15 23.4 +40 29 21   2.6838  3.0713   103.7    18.2  19.5
2015 02 15    04 16 10.7 +40 23 00   2.7008  3.0756   102.9    18.2  19.5
2015 02 16    04 16 59.3 +40 16 44   2.7179  3.0799   102.1    18.3  19.5
2015 02 17    04 17 48.9 +40 10 35   2.7351  3.0842   101.3    18.3  19.5
2015 02 18    04 18 39.6 +40 04 31   2.7523  3.0885   100.5    18.3  19.5
2015 02 19    04 19 31.5 +39 58 33   2.7696  3.0928    99.6    18.4  19.6
2015 02 20    04 20 24.4 +39 52 41   2.7869  3.0971    98.8    18.4  19.6


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Comet 17P/Holmes makes its closest approach to the Earth (1.826 AU) on the 19th November 2014 

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2014 11 18    04 52 33.9 +50 53 21   1.8261  2.6925   144.4    12.3  17.8
2014 11 19    04 51 21.5 +50 53 19   1.8259  2.6968   145.1    12.1  17.8
2014 11 20    04 50 08.0 +50 52 59   1.8260  2.7010   145.8    11.9  17.8
2014 11 21    04 48 53.5 +50 52 20   1.8262  2.7052   146.4    11.7  17.8
2014 11 22    04 47 38.3 +50 51 22   1.8267  2.7095   147.0    11.4  17.8
2014 11 23    04 46 22.3 +50 50 05   1.8275  2.7137   147.6    11.2  17.8
2014 11 24    04 45 05.7 +50 48 28   1.8285  2.7180   148.2    11.0  17.8
2014 11 25    04 43 48.6 +50 46 33   1.8297  2.7222   148.7    10.8  17.8
2014 11 26    04 42 31.2 +50 44 19   1.8312  2.7265   149.2    10.7  17.8
2014 11 27    04 41 13.6 +50 41 46   1.8329  2.7307   149.7    10.5  17.9
2014 11 28    04 39 55.8 +50 38 53   1.8348  2.7350   150.1    10.4  17.9
2014 11 29    04 38 38.0 +50 35 43   1.8371  2.7392   150.5    10.2  17.9
2014 11 30    04 37 20.4 +50 32 13   1.8395  2.7435   150.9    10.1  17.9


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Title: Peculiar Near-Nucleus Outgassing of Comet 17P/Holmes During Its 2007 Outburst
Author: Chunhua Qi (1), Michiel R. Hogerheijde (2), David Jewitt (3), Mark A. Gurwell (1), David J. Wilner (1) (1 Harvard--Smithsonian Center for Astrophysics, 2 Leiden Observatory, Leiden University, 3 Department of Earth, Planetary and Space Sciences and Department of Physics and Astronomy, University of California at Los Angeles)

We present high angular resolution Submillimeter Array observations ofthe outbursting Jupiter family comet 17P/Holmes on 2007 October 26-29, achieving a spatial resolution of 2.5", or ~3000 km at the comet distance. The observations resulted in detections of the rotational lines CO 3-2, HCN 4-3, H13CN 4-3, CS 7-6, H2CO 31,2-21,1, H2S 22,0-21,1, and multiple CH3OH lines, along with the associated dust continuum at 221 and 349 GHz. The continuum has a spectral index of 2.7±0.3, slightly steeper than blackbody emission from large dust particles. From the imaging data, we identify two components in the molecular emission. One component is characterized by a relatively broad line width (~1 km s-1 FWHM) exhibiting a symmetric outgassing pattern with respect to the nucleus position. The second component has a narrower line width (<0.5 km s-1 FWHM) with the line center red-shifted by 0.1-0.2 km s-1 (cometocentric frame), and shows a velocity shift across the nucleus position with the position angle gradually changing from 66 to 30 degrees within the four days of observations. We determine distinctly different CO/HCN ratios for each of the components. For the broad-line component we find CO/HCN <7, while in the narrow-line component, CO/HCN = 40±5. We hypothesize that the narrow-line component originates from the ice grain halo found in near-nucleus photometry, believed to be created by sublimating recently released ice grains around the nucleus during the outburst. In this interpretation, the high CO/HCN ratio of this component reflects the more pristine volatile composition of nucleus material released in the outburst.

Read more (675kb, PDF)



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Comet 17P/Holmes is at Perihelion (2.057 AU) on the 27th March 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 03 27    23 33 56.3 +02 54 27   3.0217  2.0566    12.1     5.8  17.1
2014 03 28    23 35 56.5 +03 12 59   3.0198  2.0566    12.5     6.0  17.1
2014 03 29    23 37 56.7 +03 31 31   3.0178  2.0566    12.9     6.2  17.1
2014 03 30    23 39 56.9 +03 50 03   3.0158  2.0567    13.3     6.4  17.1
2014 03 31    23 41 57.0 +04 08 36   3.0138  2.0568    13.7     6.6  17.1


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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 07 04    17 07 50.2 -47 41 19   1.9139  2.8255   147.6    11.1  18.2
2013 07 05    17 06 50.1 -47 34 28   1.9139  2.8212   147.0    11.3  18.2
2013 07 06    17 05 51.5 -47 27 25   1.9141  2.8169   146.3    11.6  18.2
2013 07 07    17 04 54.4 -47 20 11   1.9145  2.8126   145.6    11.8  18.1
2013 07 08    17 03 59.0 -47 12 45   1.9152  2.8083   144.9    12.0  18.1
2013 07 09    17 03 05.3 -47 05 09   1.9161  2.8040   144.1    12.3  18.1
2013 07 10    17 02 13.4 -46 57 23   1.9172  2.7997   143.4    12.5  18.1


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Comet 17P/Holmes
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Comet 17P/Holmes makes its closest approach to the Earth (1.914 AU) on the 4th July, 2013.



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Comet 17P/Holmes is at Opposition (1.959 AU) on the 15th June, 2013.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 06 14    17 31 05.1 -49 08 18   1.9643  2.9120   154.1     8.8
2013 06 15    17 29 52.1 -49 06 25   1.9594  2.9076   154.2     8.8
2013 06 16    17 28 38.8 -49 04 16   1.9548  2.9033   154.2     8.8
2013 06 17    17 27 25.4 -49 01 50   1.9505  2.8990   154.2     8.8
2013 06 18    17 26 12.1 -48 59 09   1.9464  2.8947   154.1     8.8
2013 06 19    17 24 58.8 -48 56 11   1.9425  2.8903   154.0     8.9
2013 06 20    17 23 45.7 -48 52 57   1.9389  2.8860   153.9     8.9
2013 06 21    17 22 32.9 -48 49 28   1.9356  2.8817   153.6     9.0  18.3
2013 06 22    17 21 20.4 -48 45 43   1.9324  2.8774   153.4     9.1  18.3
2013 06 23    17 20 08.4 -48 41 42   1.9296  2.8730   153.1     9.2  18.3
2013 06 24    17 18 56.9 -48 37 25   1.9269  2.8687   152.8     9.3  18.3
2013 06 25    17 17 46.0 -48 32 54   1.9245  2.8644   152.4     9.5  18.3
2013 06 26    17 16 35.9 -48 28 07   1.9224  2.8601   152.0     9.6  18.3
2013 06 27    17 15 26.5 -48 23 05   1.9205  2.8557   151.6     9.8  18.3
2013 06 28    17 14 18.1 -48 17 49   1.9188  2.8514   151.1     9.9  18.2
2013 06 29    17 13 10.5 -48 12 18   1.9174  2.8471   150.6    10.1  18.2
2013 06 30    17 12 04.1 -48 06 33   1.9162  2.8428   150.1    10.3  18.2


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