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Post Info TOPIC: Comet 174P/Echeclus


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Comet 174P/Echeclus (2000 EC98)
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Comet 174P/Echeclus (2000 EC98) is at Opposition (4.851 AU) in the constellation Aquarius on the 12th September 2015 



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Comet 174P/Echeclus (2000 EC98) makes its closest approach to the Earth (4.849 AU) in the constellation Aquarius on the 9th September 2015

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 09 08    23 17 22.3 -04 03 00   4.8493  5.8551   176.2     0.7
2015 09 09    23 17 00.6 -04 05 47   4.8492  5.8557   177.2     0.5
2015 09 10    23 16 38.9 -04 08 34   4.8494  5.8562   178.3     0.3
2015 09 11    23 16 17.2 -04 11 22   4.8499  5.8568   179.3     0.1
2015 09 12    23 15 55.5 -04 14 09   4.8507  5.8573   179.3     0.1
2015 09 13    23 15 33.8 -04 16 57   4.8518  5.8579   178.4     0.3
2015 09 14    23 15 12.2 -04 19 44   4.8532  5.8585   177.3     0.5
2015 09 15    23 14 50.5 -04 22 32   4.8549  5.8590   176.3     0.6
2015 09 16    23 14 29.0 -04 25 18   4.8570  5.8596   175.2     0.8
2015 09 17    23 14 07.5 -04 28 04   4.8593  5.8602   174.1     1.0
2015 09 18    23 13 46.2 -04 30 50   4.8619  5.8608   173.0     1.2
2015 09 19    23 13 24.9 -04 33 35   4.8648  5.8614   172.0     1.4
2015 09 20    23 13 03.8 -04 36 19   4.8680  5.8619   170.9     1.6


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Comet 174P/Echeclus (2000 EC98) is at Perihelion (5.817 AU) in the constellation Aquarius on the 21st April 2015 

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 04 20    22 56 28.5 -05 30 39   6.4676  5.8171    46.2     7.2
2015 04 21    22 57 09.3 -05 26 40   6.4564  5.8171    46.9     7.3
2015 04 22    22 57 49.8 -05 22 43   6.4451  5.8171    47.7     7.3
2015 04 23    22 58 30.0 -05 18 47   6.4337  5.8171    48.5     7.4
2015 04 24    22 59 09.9 -05 14 53   6.4221  5.8171    49.3     7.5
2015 04 25    22 59 49.5 -05 11 01   6.4103  5.8171    50.1     7.6
2015 04 26    23 00 28.8 -05 07 10   6.3984  5.8171    50.9     7.7
2015 04 27    23 01 07.7 -05 03 21   6.3864  5.8171    51.7     7.8
2015 04 28    23 01 46.4 -04 59 34   6.3743  5.8171    52.5     7.9
2015 04 29    23 02 24.7 -04 55 48   6.3620  5.8172    53.3     8.0
2015 04 30    23 03 02.7 -04 52 04   6.3497  5.8172    54.1     8.1


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Comet 174P/Echeclus makes its closest approach to the Earth (4.933 AU) on the 10th August 2014 



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Comet 174P/Echeclus (60558) (2000 EC98) is at Opposition (4.934 AU) on the 8th August 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 08 08    21 05 00.9 -13 16 54   4.9343  5.9469   176.7     0.6
2014 08 09    21 04 37.8 -13 18 57   4.9337  5.9459   176.4     0.6
2014 08 10    21 04 14.8 -13 21 01   4.9334  5.9449   175.9     0.7
2014 08 11    21 03 51.9 -13 23 05   4.9334  5.9439   175.2     0.8
2014 08 12    21 03 29.0 -13 25 10   4.9337  5.9429   174.3     1.0
2014 08 13    21 03 06.1 -13 27 14   4.9343  5.9420   173.4     1.1
2014 08 14    21 02 43.4 -13 29 19   4.9352  5.9410   172.5     1.3
2014 08 15    21 02 20.7 -13 31 24   4.9364  5.9400   171.5     1.4


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Comet 174P/Echeclus makes its closest approach to the Earth (5.558 AU) on the 15th July, 2013.



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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 07 05    19 05 38.2 -17 47 16   5.5719  6.5847   174.5     0.8
2013 07 06    19 05 14.2 -17 48 00   5.5692  6.5826   175.0     0.8
2013 07 07    19 04 50.3 -17 48 44   5.5668  6.5805   175.2     0.7
2013 07 08    19 04 26.3 -17 49 30   5.5647  6.5784   175.2     0.7
2013 07 09    19 04 02.3 -17 50 16   5.5629  6.5763   175.0     0.8
2013 07 10    19 03 38.3 -17 51 03   5.5614  6.5742   174.6     0.8
2013 07 11    19 03 14.4 -17 51 50   5.5602  6.5721   174.0     0.9
2013 07 12    19 02 50.5 -17 52 38   5.5592  6.5701   173.4     1.0
2013 07 13    19 02 26.6 -17 53 26   5.5586  6.5680   172.6     1.1
2013 07 14    19 02 02.9 -17 54 16   5.5583  6.5659   171.8     1.3
2013 07 15    19 01 39.2 -17 55 05   5.5582  6.5638   170.9     1.4


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Comet 174P/Echeclus is at Opposition (5.567 AU) on the 7th July, 2013.



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Title: 174P/Echeclus: a strange case of outburst
Authors: P. Rousselot

Context. More than ten Centaurs are now known to have cometary activity at large heliocentric distance (i.e. >= 5-13 AU). Among these objects, 174P/Echeclus which showed cometary activity at 13 AU from the Sun, is a unique case, because of: (i) the amplitude of its outburst, (ii) the source of cometary activity that appears distinct from Echeclus itself.
Aims. This paper aims at investigating the physical conditions that have led to this unusual outburst. The purpose is also to quantify this phenomenon and to provide observational constraints for its modelling.
Methods. We use observations from different telescopes, performed before, during, and after the outburst. We performed the main observations on March 23 and 30, 2006, with the 8.2-m ESO Very Large Telescope and FORS 1 instrument. They consist of visible images and spectra.
Results. Our main results are: (i) a cometary source distinct from Echeclus itself that presents a brightness distribution compatible with a diffuse source; (ii) a total dust production rate Q_dust equal to about 86 kg.s^-1 and a parameter Afrho equal to 10,000cm; (iii) no emission lines (CN and C_2) can be detected in the visible range; (iv) the upper limits for the CN and C_2 production rates are about 3.8x10^25 and 10^26 molecules.s^-1 respectively; (v) we detected no Echeclus' satellite before the outburst up to M_R equal to about 26; (vi) the upper limit for the object generating the coma is about 8 km in diameter; (vii) and we detected no cometary activity one year later, in March 2007.

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