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Post Info TOPIC: Comet 29P/Schwassmann-Wachmann
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Comet 29P/Schwassmann-Wachmann 1
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Title: A New Analysis of Spitzer Observations of Comet 29P/Schwassmann-Wachmann 1
Author: Charles A. Schambeau, Yanga R. Fernandez, Carey M. Lisse, Nalin Samarasinha, Laura M. Woodney

We present a new analysis of Spitzer observations of comet 29P/Schwassmann-Wachmann 1 taken on UT 2003 November 21, 23, and 24, similar to a previous investigation of the observations (Stansberry et al. 2004), but using the most recent Spitzer data pipeline products and intensive image processing techniques. Analysis of images from the IRAC 5.8 & 8.0 µm bands and the MIPS 24.0 & 70.0 µm bands resulted in photometry measurements of the nucleus after a suite of coma modelling and removal processes were implemented. SW1 was not identified in the 5.8 µm image from the previous work so its incorporation into this analysis is entirely new. Using the Near Earth Asteroid Thermal Model (Harris 1998) resulted in a nucleus radius measurement of R = 30.2^{+3.7}_{-2.9} km and an infrared beaming parameter value of eta = 0.99^{+0.26}_{-0.19}. We also measured an infrared geometric albedo, p5.8 = 0.5 ± 0.5. Extrapolating a 0.04 V-band albedo and using a normalised reflectivity gradient S'=14.94±1.09 [% (1000
{A})^-1] (Duffard et al. 2014) we recover an infrared albedo of p5.8 = 0.31 in the near infrared consistent with the value recovered from thermal modelling. The dust composition extracted from IRS spectra are very comet-like, containing mainly amorphous ferromagnesian silicates (but with a minority of crystalline silicates as well), water ice, and metal sulphides.

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Comet 29P/Schwassmann-Wachmann 1 makes its closest approach to the Earth (5.027 AU) in the constellation Scorpius on the 18th June 2015.



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RE: Comet 29P/Schwassmann-Wachmann
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Comet 29P/Schwassmann-Wachmann is at Opposition (5.027 AU) in the constellation Scorpius on the 17th June 2015

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 06 15    17 37 45.0 -31 41 15   5.0284  6.0348   171.5     1.4  15.3
2015 06 16    17 37 13.0 -31 40 30   5.0277  6.0345   171.6     1.4  15.3
2015 06 17    17 36 41.0 -31 39 43   5.0272  6.0342   171.7     1.4  15.3
2015 06 18    17 36 09.0 -31 38 54   5.0270  6.0339   171.6     1.4  15.3
2015 06 19    17 35 37.1 -31 38 03   5.0272  6.0336   171.3     1.5  15.3
2015 06 20    17 35 05.2 -31 37 09   5.0276  6.0333   171.0     1.5  15.3
2015 06 21    17 34 33.4 -31 36 13   5.0284  6.0330   170.5     1.6  15.3
2015 06 22    17 34 01.7 -31 35 16   5.0294  6.0327   170.0     1.7  15.3
2015 06 23    17 33 30.1 -31 34 16   5.0307  6.0325   169.4     1.8  15.3
2015 06 24    17 32 58.7 -31 33 14   5.0323  6.0322   168.7     1.9  15.3
2015 06 25    17 32 27.4 -31 32 10   5.0342  6.0319   167.9     2.0  15.3
2015 06 26    17 31 56.3 -31 31 04   5.0364  6.0316   167.1     2.2  15.3
2015 06 27    17 31 25.5 -31 29 56   5.0389  6.0313   166.3     2.3  15.3
2015 06 28    17 30 54.8 -31 28 47   5.0417  6.0310   165.4     2.4  15.3
2015 06 29    17 30 24.5 -31 27 35   5.0447  6.0307   164.6     2.6  15.3
2015 06 30    17 29 54.3 -31 26 22   5.0481  6.0304   163.7     2.7  15.3


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Comet 29P/Schwassmann-Wachmann is at Opposition (5.144 AU) on the 20th May 2014 

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 05 19    15 38 34.5 -30 30 52   5.1451  6.1414   169.1     1.8  15.4
2014 05 20    15 38 04.1 -30 29 08   5.1443  6.1412   169.2     1.8  15.4
2014 05 21    15 37 33.8 -30 27 22   5.1438  6.1410   169.3     1.8  15.4
2014 05 22    15 37 03.4 -30 25 33   5.1436  6.1407   169.2     1.8  15.4
2014 05 23    15 36 33.2 -30 23 42   5.1437  6.1405   169.0     1.8  15.4
2014 05 24    15 36 03.0 -30 21 48   5.1441  6.1402   168.7     1.9  15.4
2014 05 25    15 35 33.0 -30 19 52   5.1448  6.1400   168.3     1.9  15.4
2014 05 26    15 35 03.1 -30 17 54   5.1458  6.1397   167.8     2.0  15.4
2014 05 27    15 34 33.4 -30 15 53   5.1471  6.1395   167.3     2.1  15.4
2014 05 28    15 34 03.8 -30 13 51   5.1486  6.1392   166.7     2.2  15.4
2014 05 29    15 33 34.4 -30 11 46   5.1505  6.1390   166.1     2.3  15.4
2014 05 30    15 33 05.3 -30 09 40   5.1527  6.1387   165.4     2.4  15.4
2014 05 31    15 32 36.4 -30 07 31   5.1551  6.1385   164.6     2.5  15.4


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Comet 29P/Schwassmann-Wachmann makes its closest approach to the Earth (5.230 AU) on the 26th April, 2013.



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Comet 29P/Schwassmann-Wachmann is at Opposition (5.231 AU) on the 24th April, 2013.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 04 23    13 52 48.5 -23 23 32   5.2317  6.2211   168.8     1.8  15.5
2013 04 24    13 52 20.6 -23 21 17   5.2310  6.2209   168.9     1.8  15.5
2013 04 25    13 51 52.8 -23 18 59   5.2306  6.2208   168.9     1.8  15.5
2013 04 26    13 51 25.0 -23 16 39   5.2304  6.2206   168.8     1.8  15.5
2013 04 27    13 50 57.4 -23 14 17   5.2306  6.2205   168.6     1.8  15.5
2013 04 28    13 50 29.8 -23 11 53   5.2311  6.2203   168.3     1.9  15.5
2013 04 29    13 50 02.4 -23 09 26   5.2318  6.2202   167.9     1.9  15.5
2013 04 30    13 49 35.1 -23 06 58   5.2329  6.2200   167.5     2.0  15.5


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Comet 29P/Schwassmann-Wachmann 1 makes its closest approach to the Earth (5.272 AU) on the 31st March, 2012



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RE: Comet 29P/Schwassmann-Wachmann 1
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Comet 29P/Schwassmann-Wachmann 1 makes its closest approach to the Earth (5.263 AU) on the 7th March, 2011.

Ephemeris
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag  m2
2011 03 06    10 59 17.3 -00 11 51   5.2631  6.2500   173.7     1.0  15.6  18.7
2011 03 07    10 58 50.6 -00 09 45   5.2628  6.2501   173.8     1.0  15.6  18.7
2011 03 08    10 58 23.9 -00 07 37   5.2628  6.2502   173.7     1.0  15.6  18.7
2011 03 09    10 57 57.3 -00 05 28   5.2631  6.2503   173.4     1.0  15.6  18.7
2011 03 10    10 57 30.8 -00 03 18   5.2637  6.2504   173.0     1.1  15.6  18.8
2011 03 11    10 57 04.3 -00 01 07   5.2646  6.2505   172.4     1.2  15.6  18.8
2011 03 12    10 56 37.9 +00 01 04   5.2658  6.2505   171.7     1.3  15.6  18.8
2011 03 13    10 56 11.7 +00 03 16   5.2674  6.2506   170.9     1.4  15.6  18.8
2011 03 14    10 55 45.6 +00 05 29   5.2693  6.2507   170.1     1.6  15.6  18.8
2011 03 15    10 55 19.6 +00 07 42   5.2714  6.2508   169.2     1.7  15.6  18.8
2011 03 16    10 54 53.9 +00 09 55   5.2739  6.2509   168.3     1.9  15.6  18.8
2011 03 17    10 54 28.3 +00 12 09   5.2767  6.2510   167.3     2.0  15.6  18.8
2011 03 18    10 54 02.9 +00 14 23   5.2798  6.2511   166.3     2.2  15.6  18.8
2011 03 19    10 53 37.7 +00 16 36   5.2831  6.2511   165.3     2.3  15.6  18.9
2011 03 20    10 53 12.7 +00 18 50   5.2868  6.2512   164.3     2.5  15.6  18.9
2011 03 21    10 52 48.0 +00 21 04   5.2908  6.2513   163.3     2.6  15.6  18.9
2011 03 22    10 52 23.5 +00 23 17   5.2951  6.2514   162.3     2.8  15.6  18.9
2011 03 23    10 51 59.4 +00 25 30   5.2996  6.2515   161.3     2.9  15.6  18.9
2011 03 24    10 51 35.5 +00 27 42   5.3045  6.2516   160.2     3.1  15.6  18.9
2011 03 25    10 51 11.9 +00 29 54   5.3097  6.2516   159.2     3.2  15.6  18.9
2011 03 26    10 50 48.6 +00 32 05   5.3151  6.2517   158.1     3.4  15.6  18.9
2011 03 27    10 50 25.6 +00 34 16   5.3208  6.2518   157.1     3.6  15.6  19.0
2011 03 28    10 50 03.0 +00 36 26   5.3268  6.2519   156.0     3.7  15.6  19.0
2011 03 29    10 49 40.7 +00 38 35   5.3331  6.2520   155.0     3.9  15.6  19.0
2011 03 30    10 49 18.9 +00 40 42   5.3397  6.2520   153.9     4.0  15.6  19.0
2011 03 31    10 48 57.4 +00 42 49   5.3465  6.2521   152.9     4.2  15.6  19.0


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RE: Comet 29P/Schwassmann-Wachmann
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Ephemeris
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2010 04 04    09 16.93   +13 24.2    5.595    6.203   123.5     7.7  15.7
2010 04 09    09 16.41   +13 25.0    5.664    6.204   118.5     8.2  15.7
2010 04 14    09 16.16   +13 24.6    5.737    6.205   113.5     8.5  15.7
2010 04 19    09 16.17   +13 23.1    5.812    6.206   108.6     8.8  15.7
2010 04 24    09 16.45   +13 20.4    5.890    6.207   103.8     9.1  15.8
2010 04 29    09 16.99   +13 16.7    5.969    6.208    99.1     9.2  15.8


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Comet 29P/Schwassmann-Wachmann 1 makes its closest approach to the Earth (5.207 AU), on the 11th February, 2010.

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