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Post Info TOPIC: Comet C/2010 S1 (LINEAR)
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Title: CCD polarimetry of distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at the 6-m telescope of the SAO RAS
Author: Oleksandra V. Ivanova, Janna M. Dlugach, Viktor L. Afanasiev, Volodymyr M. Reshetnyk, Pavlo P. Korsun

We present first measurements of the degree of linear polarisation of distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at heliocentric distances r= 5.9 - 7.0 AU. Observations were carried out with the SCORPIO-2 focal reducer at the 6-m telescope of the SAO RAS. Both comets showed considerable level of activity beyond a zone where water ice sublimation is negligible (up to 5 AU). Significant spatial variations both in the intensity and polarisation are found in both comets. The slope of radial profiles of intensity changes gradually with the distance from the photocenter: from - 0.7 near the nucleus up to about - 1.3 for larger distances (up to 100000 km). The variation in polarisation profiles indicates the non uniformity in the polarisation distribution over the coma. The polarisation degree over the coma gradually increases (in absolute value) with increasing the photocentric distance from of about - 1.9% up to - 3% for comet C/2010 S1 (LINEAR), and from of about - 2.5% up to - 3.5% for comet C/2010 R1 (LINEAR). These polarisation values are significantly higher than typical value of the whole coma polarisation (-1.5%) for comets at heliocentric distances less than 5 AU. The obtained photometric and polarimetric data are compared with those derived early for other comets at smaller heliocentric distances. Numerical modelling of light scattering characteristics was performed for media composed of particles with different refractive index, shape, and size. The computations were made by using the superposition T-matrix method. We obtained that for comet C/2010 S1 (LINEAR), the dust in the form of aggregates of overall radius R ~ 1.3 µm composed of N = 1000 spherical monomers with radius a = 0.1 µm, refractive index m = 1.65 + i 0.05, allows to obtain a satisfactory agreement between the results of polarimetric observations of comet C/2010 S1 and computations.

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Comet C/2010 S1 (LINEAR) is at Opposition (5.639 AU) on the 12th July 2014



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Comet C/2010 S1 (LINEAR) makes its closest approach to the Earth (5.624 AU) on the 3rd July 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 07 01    19 13 27.4 +01 05 44   5.6241  6.5553   154.3     3.9  15.4
2014 07 02    19 12 35.3 +01 00 16   5.6237  6.5583   154.9     3.8  15.4
2014 07 03    19 11 43.1 +00 54 43   5.6236  6.5614   155.3     3.7  15.4
2014 07 04    19 10 50.8 +00 49 05   5.6239  6.5644   155.8     3.6  15.4
2014 07 05    19 09 58.5 +00 43 24   5.6245  6.5674   156.2     3.6  15.4
2014 07 06    19 09 06.2 +00 37 38   5.6255  6.5705   156.5     3.5  15.4
2014 07 07    19 08 13.9 +00 31 48   5.6268  6.5735   156.8     3.5  15.4
2014 07 08    19 07 21.5 +00 25 55   5.6285  6.5765   157.0     3.5  15.4
2014 07 09    19 06 29.3 +00 19 57   5.6305  6.5796   157.2     3.4  15.4
2014 07 10    19 05 37.1 +00 13 56   5.6329  6.5826   157.3     3.4  15.4
2014 07 11    19 04 44.9 +00 07 51   5.6356  6.5857   157.4     3.4  15.4
2014 07 12    19 03 52.9 +00 01 43   5.6387  6.5888   157.4     3.4  15.4
2014 07 13    19 03 01.0 -00 04 29   5.6422  6.5918   157.3     3.4  15.4
2014 07 14    19 02 09.2 -00 10 44   5.6460  6.5949   157.2     3.4  15.5
2014 07 15    19 01 17.6 -00 17 03   5.6501  6.5980   157.1     3.4  15.5
2014 07 16    19 00 26.1 -00 23 25   5.6546  6.6011   156.8     3.5  15.5
2014 07 17    18 59 34.9 -00 29 50   5.6595  6.6042   156.5     3.5  15.5
2014 07 18    18 58 43.8 -00 36 17   5.6647  6.6073   156.2     3.6  15.5
2014 07 19    18 57 53.0 -00 42 48   5.6703  6.6104   155.8     3.6  15.5
2014 07 20    18 57 02.4 -00 49 21   5.6762  6.6135   155.4     3.7  15.5
2014 07 21    18 56 12.1 -00 55 58   5.6825  6.6166   154.9     3.7  15.5
2014 07 22    18 55 22.1 -01 02 36   5.6891  6.6197   154.4     3.8  15.5
2014 07 23    18 54 32.4 -01 09 17   5.6961  6.6229   153.8     3.9  15.5
2014 07 24    18 53 43.0 -01 16 01   5.7034  6.6260   153.2     4.0  15.5
2014 07 25    18 52 54.0 -01 22 47   5.7111  6.6291   152.6     4.0  15.5
2014 07 26    18 52 05.3 -01 29 34   5.7191  6.6323   151.9     4.1  15.5
2014 07 27    18 51 17.0 -01 36 24   5.7274  6.6354   151.2     4.2  15.5
2014 07 28    18 50 29.0 -01 43 16   5.7361  6.6386   150.5     4.3  15.5
2014 07 29    18 49 41.5 -01 50 09   5.7451  6.6417   149.7     4.4  15.5
2014 07 30    18 48 54.5 -01 57 04   5.7545  6.6449   148.9     4.5  15.5
2014 07 31    18 48 07.8 -02 04 01   5.7642  6.6481   148.1     4.6  15.5


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Comet C/2010 S1 (LINEAR) is at Opposition (5.207 AU) on the 8th August, 2013.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 08 07    19 59 10.4 +29 11 33   5.2063  5.9261   131.4     7.4  14.8
2013 08 08    19 58 06.5 +29 01 58   5.2071  5.9268   131.4     7.4  14.8
2013 08 09    19 57 03.1 +28 52 14   5.2083  5.9275   131.4     7.4  14.8
2013 08 10    19 56 00.2 +28 42 21   5.2098  5.9281   131.3     7.4  14.8
2013 08 11    19 54 57.9 +28 32 18   5.2116  5.9288   131.2     7.4  14.8
2013 08 12    19 53 56.1 +28 22 07   5.2137  5.9295   131.1     7.4  14.8
2013 08 13    19 52 54.9 +28 11 47   5.2162  5.9303   131.0     7.4  14.8
2013 08 14    19 51 54.3 +28 01 19   5.2189  5.9310   130.8     7.4  14.8
2013 08 15    19 50 54.4 +27 50 42   5.2219  5.9317   130.7     7.4  14.8
2013 08 16    19 49 55.0 +27 39 58   5.2253  5.9324   130.4     7.5  14.8
2013 08 17    19 48 56.4 +27 29 07   5.2289  5.9332   130.2     7.5  14.8
2013 08 18    19 47 58.4 +27 18 08   5.2329  5.9339   130.0     7.5  14.8
2013 08 19    19 47 01.1 +27 07 02   5.2371  5.9347   129.7     7.5  14.8
2013 08 20    19 46 04.6 +26 55 49   5.2417  5.9355   129.4     7.6  14.8


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Comet C/2010 S1 (LINEAR) makes its closest approach to the Earth (5.205 AU) on the 5th August, 2013.



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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 05 19    21 12 45.3 +32 37 41   5.8915  5.8998    85.5     9.8  15.1
2013 05 20    21 12 18.0 +32 40 11   5.8782  5.8998    86.3     9.9  15.1
2013 05 21    21 11 49.7 +32 42 38   5.8649  5.8998    87.0     9.9  15.0
2013 05 22    21 11 20.5 +32 45 01   5.8517  5.8998    87.8     9.9  15.0
2013 05 23    21 10 50.4 +32 47 21   5.8384  5.8999    88.5     9.9  15.0
2013 05 24    21 10 19.4 +32 49 36   5.8251  5.8999    89.3     9.9  15.0
2013 05 25    21 09 47.6 +32 51 48   5.8119  5.8999    90.0     9.9  15.0
2013 05 26    21 09 14.8 +32 53 55   5.7987  5.9000    90.8     9.9  15.0
2013 05 27    21 08 41.1 +32 55 58   5.7854  5.9000    91.5     9.9  15.0
2013 05 28    21 08 06.5 +32 57 56   5.7723  5.9001    92.3     9.9  15.0
2013 05 29    21 07 31.0 +32 59 50   5.7591  5.9001    93.0     9.9  15.0
2013 05 30    21 06 54.7 +33 01 39   5.7460  5.9002    93.8     9.9  15.0
2013 05 31    21 06 17.4 +33 03 22   5.7329  5.9003    94.5     9.9  15.0


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Comet C/2010 S1 (LINEAR) is at perihelion (5.900 AU) on the 20th May, 2013



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Comet C/2010 S1 (LINEAR) makes its closest approach to the Earth (5.615 AU) on the 25th September, 2012



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Orbital elements:
    C/2010 S1 (LINEAR)
T 2013 May 19.9695 TT                                   MPC
q   5.905842             (2000.0)            P               Q
                   Peri.  118.5400      +0.5359915      -0.2229905
                   Node    93.4506      -0.6945370      -0.6647686
e   1.0            Incl.  125.3414      +0.4799286      -0.7129922
From 190 observations 2010 Sept. 21-Oct. 21.

MPEC 2010 - U34

Comet C/2010 S1 (LINEAR) was discovered by LINEAR survry telescope.
The orbital elements of the comet indicate a perihelion passage on the 19th May, 2013, at a distance of 5.9 AU from the Sun.

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