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Comet 300P/Catalina
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Comet 300P/Catalina makes its closest approach to the Earth (1.563 AU) on the 23rd April 2018



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Comet 300P/Catalina in the constellation Virgo is at Opposition (1.661 AU) on the 27th March 2018.

Magnitude: 21.3



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Comet 300P/Catalina makes its closest approach to the Earth (1.462 AU) on the 25th November 2014 

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2014 11 25    06 35 30.8 +21 18 35   1.4622  2.3349   144.1    14.4  20.5
2014 11 26    06 34 11.0 +21 21 19   1.4624  2.3431   145.4    13.8  20.5
2014 11 27    06 32 49.6 +21 24 03   1.4628  2.3513   146.8    13.3  20.5
2014 11 28    06 31 26.7 +21 26 46   1.4635  2.3595   148.1    12.8  20.6
2014 11 29    06 30 02.3 +21 29 29   1.4644  2.3676   149.4    12.2  20.6
2014 11 30    06 28 36.6 +21 32 11   1.4656  2.3757   150.8    11.7  20.6
2014 12 01    06 27 09.6 +21 34 52   1.4671  2.3839   152.1    11.1  20.6
2014 12 02    06 25 41.4 +21 37 32   1.4688  2.3919   153.5    10.6  20.6
2014 12 03    06 24 12.1 +21 40 10   1.4708  2.4000   154.8    10.1  20.6
2014 12 04    06 22 41.9 +21 42 46   1.4731  2.4081   156.2     9.5  20.7
2014 12 05    06 21 10.8 +21 45 21   1.4756  2.4161   157.6     9.0  20.7
2014 12 06    06 19 38.9 +21 47 53   1.4785  2.4241   158.9     8.4  20.7
2014 12 07    06 18 06.3 +21 50 23   1.4816  2.4321   160.3     7.8  20.7
2014 12 08    06 16 33.1 +21 52 50   1.4851  2.4400   161.7     7.3  20.7
2014 12 09    06 14 59.4 +21 55 15   1.4888  2.4480   163.1     6.7  20.8
2014 12 10    06 13 25.4 +21 57 37   1.4929  2.4559   164.4     6.2  20.8
2014 12 11    06 11 51.0 +21 59 56   1.4972  2.4638   165.8     5.6  20.8
2014 12 12    06 10 16.5 +22 02 13   1.5019  2.4717   167.2     5.1  20.8
2014 12 13    06 08 41.9 +22 04 25   1.5068  2.4795   168.6     4.5  20.8
2014 12 14    06 07 07.3 +22 06 35   1.5121  2.4873   170.0     4.0  20.9
2014 12 15    06 05 32.9 +22 08 41   1.5177  2.4952   171.3     3.4  20.9
2014 12 16    06 03 58.7 +22 10 44   1.5236  2.5030   172.7     2.9  20.9
2014 12 17    06 02 24.8 +22 12 44   1.5298  2.5107   174.1     2.3  20.9
2014 12 18    06 00 51.4 +22 14 40   1.5363  2.5185   175.4     1.8  20.9
2014 12 19    05 59 18.5 +22 16 32   1.5432  2.5262   176.7     1.3  21.0
2014 12 20    05 57 46.3 +22 18 21   1.5504  2.5339   178.0     0.8  21.0
2014 12 21    05 56 14.8 +22 20 07   1.5579  2.5416   178.9     0.4  21.0
2014 12 22    05 54 44.1 +22 21 49   1.5657  2.5493   178.5     0.6  21.0
2014 12 23    05 53 14.4 +22 23 27   1.5739  2.5569   177.4     1.0  21.1
2014 12 24    05 51 45.7 +22 25 02   1.5823  2.5645   176.1     1.5  21.1
2014 12 25    05 50 18.1 +22 26 34   1.5911  2.5722   174.8     2.0  21.1
2014 12 26    05 48 51.7 +22 28 02   1.6002  2.5797   173.4     2.5  21.1
2014 12 27    05 47 26.6 +22 29 28   1.6096  2.5873   172.1     3.0  21.2
2014 12 28    05 46 02.9 +22 30 50   1.6193  2.5949   170.8     3.5  21.2
2014 12 29    05 44 40.5 +22 32 10   1.6293  2.6024   169.5     4.0  21.2
2014 12 30    05 43 19.7 +22 33 26   1.6397  2.6099   168.1     4.4  21.2
2014 12 31    05 42 00.4 +22 34 40   1.6503  2.6174   166.8     4.9  21.3


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Comet 300P/Catalina is at Perihelion (0.826 AU) on the 29th May 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 05 28    01 15 39.5 +04 55 40   1.0511  0.8264    47.2    64.0  15.3
2014 05 29    01 20 24.8 +05 19 42   1.0607  0.8260    46.9    63.6  15.3
2014 05 30    01 25 07.4 +05 43 24   1.0704  0.8259    46.6    63.1  15.3
2014 05 31    01 29 47.4 +06 06 45   1.0802  0.8261    46.3    62.6  15.3
2014 06 01    01 34 24.7 +06 29 46   1.0901  0.8266    46.1    62.1  15.4
2014 06 02    01 38 59.4 +06 52 27   1.1001  0.8274    45.9    61.6  15.4
2014 06 03    01 43 31.5 +07 14 46   1.1101  0.8284    45.6    61.1  15.4
2014 06 04    01 48 01.1 +07 36 44   1.1202  0.8298    45.4    60.5  15.4
2014 06 05    01 52 28.2 +07 58 21   1.1304  0.8315    45.2    60.0  15.5
2014 06 06    01 56 52.8 +08 19 37   1.1406  0.8335    45.0    59.5  15.5
2014 06 07    02 01 15.0 +08 40 31   1.1508  0.8357    44.9    58.9  15.5
2014 06 08    02 05 34.8 +09 01 03   1.1611  0.8383    44.7    58.4  15.6
2014 06 09    02 09 52.2 +09 21 13   1.1714  0.8411    44.5    57.8  15.6
2014 06 10    02 14 07.3 +09 41 01   1.1817  0.8442    44.4    57.3  15.6
2014 06 11    02 18 20.0 +10 00 27   1.1920  0.8476    44.3    56.7  15.7
2014 06 12    02 22 30.5 +10 19 32   1.2022  0.8512    44.1    56.2  15.7
2014 06 13    02 26 38.7 +10 38 14   1.2125  0.8551    44.0    55.6  15.7
2014 06 14    02 30 44.6 +10 56 34   1.2228  0.8593    43.9    55.1  15.8
2014 06 15    02 34 48.4 +11 14 32   1.2330  0.8637    43.9    54.6  15.8
2014 06 16    02 38 49.9 +11 32 08   1.2432  0.8683    43.8    54.0  15.9
2014 06 17    02 42 49.3 +11 49 21   1.2533  0.8732    43.7    53.5  15.9
2014 06 18    02 46 46.6 +12 06 13   1.2635  0.8783    43.7    53.0  15.9
2014 06 19    02 50 41.7 +12 22 43   1.2735  0.8837    43.6    52.5  16.0
2014 06 20    02 54 34.6 +12 38 51   1.2835  0.8893    43.6    52.0  16.0
2014 06 21    02 58 25.5 +12 54 37   1.2934  0.8951    43.6    51.5  16.1
2014 06 22    03 02 14.3 +13 10 02   1.3033  0.9011    43.6    51.0  16.1
2014 06 23    03 06 01.0 +13 25 04   1.3131  0.9073    43.6    50.5  16.2
2014 06 24    03 09 45.6 +13 39 46   1.3228  0.9137    43.6    50.1  16.2
2014 06 25    03 13 28.2 +13 54 06   1.3324  0.9203    43.6    49.6  16.3
2014 06 26    03 17 08.7 +14 08 05   1.3420  0.9270    43.6    49.2  16.3
2014 06 27    03 20 47.2 +14 21 42   1.3514  0.9340    43.7    48.7  16.4
2014 06 28    03 24 23.6 +14 34 59   1.3608  0.9411    43.7    48.3  16.4
2014 06 29    03 27 58.0 +14 47 56   1.3700  0.9483    43.8    47.9  16.5
2014 06 30    03 31 30.4 +15 00 32   1.3792  0.9558    43.9    47.5  16.5


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Comet 300P/Catalina makes its closest approach to the Earth (0.863 AU) on the 24th April, 2014



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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 04 23    21 59 48.4 -10 44 43   0.8630  1.0014    64.3    64.8  15.7
2014 04 24    22 06 01.4 -10 19 53   0.8626  0.9932    63.7    65.2  15.6
2014 04 25    22 12 13.7 -09 54 35   0.8627  0.9851    63.1    65.6  15.6
2014 04 26    22 18 25.1 -09 28 50   0.8631  0.9771    62.5    66.0  15.6
2014 04 27    22 24 35.3 -09 02 42   0.8639  0.9693    61.9    66.3  15.5
2014 04 28    22 30 44.2 -08 36 12   0.8652  0.9616    61.3    66.6  15.5
2014 04 29    22 36 51.6 -08 09 22   0.8668  0.9541    60.7    66.9  15.5
2014 04 30    22 42 57.2 -07 42 15   0.8688  0.9467    60.1    67.2  15.5
2014 05 01    22 49 01.0 -07 14 52   0.8712  0.9394    59.5    67.5  15.4
2014 05 02    22 55 02.7 -06 47 15   0.8740  0.9324    58.9    67.7  15.4
2014 05 03    23 01 02.2 -06 19 28   0.8771  0.9255    58.3    67.9  15.4
2014 05 04    23 06 59.4 -05 51 32   0.8806  0.9187    57.7    68.1  15.4
2014 05 05    23 12 54.2 -05 23 28   0.8845  0.9122    57.2    68.3  15.3
2014 05 06    23 18 46.4 -04 55 19   0.8887  0.9058    56.6    68.4  15.3
2014 05 07    23 24 35.9 -04 27 07   0.8932  0.8997    56.1    68.5  15.3
2014 05 08    23 30 22.8 -03 58 54   0.8981  0.8937    55.5    68.6  15.3
2014 05 09    23 36 06.8 -03 30 41   0.9033  0.8880    55.0    68.6  15.3
2014 05 10    23 41 47.9 -03 02 29   0.9088  0.8825    54.5    68.6  15.2
2014 05 11    23 47 26.1 -02 34 22   0.9147  0.8772    54.0    68.6  15.2
2014 05 12    23 53 01.4 -02 06 19   0.9208  0.8721    53.5    68.5  15.2
2014 05 13    23 58 33.7 -01 38 23   0.9272  0.8672    53.0    68.4  15.2
2014 05 14    00 04 03.0 -01 10 35   0.9339  0.8626    52.5    68.3  15.2
2014 05 15    00 09 29.2 -00 42 55   0.9409  0.8583    52.0    68.2  15.2
2014 05 16    00 14 52.4 -00 15 26   0.9481  0.8542    51.6    68.0  15.2
2014 05 17    00 20 12.6 +00 11 51   0.9556  0.8503    51.1    67.8  15.2
2014 05 18    00 25 29.8 +00 38 57   0.9633  0.8468    50.7    67.6  15.2
2014 05 19    00 30 44.0 +01 05 49   0.9712  0.8434    50.3    67.3  15.2
2014 05 20    00 35 55.1 +01 32 28   0.9794  0.8404    49.9    67.1  15.2
2014 05 21    00 41 03.3 +01 58 51   0.9878  0.8377    49.5    66.8  15.2
2014 05 22    00 46 08.6 +02 24 59   0.9963  0.8352    49.1    66.4  15.2
2014 05 23    00 51 10.9 +02 50 50   1.0050  0.8330    48.8    66.1  15.2
2014 05 24    00 56 10.3 +03 16 24   1.0139  0.8311    48.4    65.7  15.2
2014 05 25    01 01 06.8 +03 41 41   1.0230  0.8295    48.1    65.3  15.2
2014 05 26    01 06 00.5 +04 06 39   1.0322  0.8282    47.8    64.9  15.3
2014 05 27    01 10 51.4 +04 31 19   1.0416  0.8272    47.5    64.5  15.3
2014 05 28    01 15 39.5 +04 55 40   1.0511  0.8264    47.2    64.0  15.3
2014 05 29    01 20 24.8 +05 19 42   1.0607  0.8260    46.9    63.6  15.3
2014 05 30    01 25 07.4 +05 43 24   1.0704  0.8259    46.6    63.1  15.3
2014 05 31    01 29 47.4 +06 06 45   1.0802  0.8261    46.3    62.6  15.3


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Comet Catalina 2005 JQ5
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A comet has been added to the list of potentially threatening near-Earth objects maintained by NASA's Jet Propulsion Laboratory. Comet Catalina 2005 JQ5 is the largest - and therefore most potentially devastating - of the 70 objects now being tracked. However, the chances of a collision are very low.
The listing of Comet Catalina underscores the uncertainty in the knowledge of whether comets or asteroids pose a greater threat to Earth. Previous estimates of the proportion of the impact risk posed by comets have varied widely, from 1% to 50%, with most recent estimates at the lower end.
ut comets are larger and faster-moving, on average, so their impacts could be a significant part of the overall risk to human life. And, unlike asteroids, they lie on randomly-oriented and usually highly elongated orbits. This makes them much more likely to remain undiscovered until they are very close to Earth.
Comet Catalina was found by the Catalina Sky Survey, one of the six current, large-scale and automated search programmes for near-Earth asteroids. It was initially designated as an asteroid when first spotted on May 6, but was reclassified as a comet when observers saw characteristic fuzziness in the image, indicating ice and dust streaming off.
Its size is estimated at 980 metres, but that size determination is based on the assumption it is a dark-bodied asteroid, and so the bright coma of a comet would cause the estimate to be too high. 
On 26 May, JPL's unique orbital calculation software determined that Comet Catalina was on what could possibly be a collision course with Earth, though the odds of such an impact were small: just 1 chance in 300,000 of a strike, late, on June 11, 2085. Based on the 980-metre size estimate, that would produce a 6-gigaton impact - equivalent to 6 billion tonnes of TNT.
Astronomers expected the addition of further observations to the calculations to rule out any possibility of a collision, as happens with most newly-seen objects.
But that did not quite happen. The comet's predicted pathway actually drew even closer to making a perfect bulls-eye with the Earth - its predicted path passes within 1000 kilometres of the where the centre of our 12,700-km-diameter planet will be around that time.
However, uncertainty in the exact timing of the comets pass through the line of Earths orbit dropped the odds of an impact to about 1 in 120 million. That is very low, but the observations so far cannot categorically rule a collision out.
Even the slim 1 in 120 million odds are an overestimate, because comets, unlike asteroids, can move in unpredictable ways because of the forceful out gassing that creates their dusty comas and tails. 
"The uncertainty is much larger than we're modelling. But I haven't come up with a good way of dealing with this." - Steve Chesley, JPL.

The only other comet placed on the JPL list of near-Earth objects with possible collision paths was added in 2003. But additional observations ruled out a possible impact - that comet was removed from the list after less than a week.
Just one other comet, Swift-Tuttle, has been recorded with a non-zero possibility of impact. It was rediscovered in 1992 - after more than a century's absence - before the JPL list was created.
Additional observations during Swift-Tuttles passage, thanks to the publicity surrounding the possible impact, made it possible to rule out the possibility of an Earth impact anytime in this millennium. However, Swift-Tuttle is on an orbit that will almost certainly cause it to crash into the Earth or the moon eventually.

2005JQ5.jpg


Date TT R. A. (2000) Decl. Delta   r    Elong.  Phase Mag 
2005 05 30 14 19.43 +03 22.9 0.238 1.205 139.8 32.9 15.2
2005 05 31 14 15.64 +03 44.1 0.231 1.195 138.0 34.6 15.1
2005 06 01 14 11.67 +04 05.9 0.224 1.186 136.1 36.3 15.0
2005 06 02 14 07.51 +04 28.2 0.217 1.176 134.2 38.2 14.9
2005 06 03 14 03.15 +04 51.1 0.210 1.166 132.2 40.1 14.8
2005 06 04 13 58.55 +05 14.6 0.204 1.156 130.2 42.1 14.7
2005 06 05 13 53.72 +05 38.9 0.197 1.147 128.1 44.1 14.6
2005 06 06 13 48.63 +06 03.8 0.191 1.137 125.9 46.3 14.5
2005 06 07 13 43.26 +06 29.5 0.185 1.128 123.6 48.5 14.4
2005 06 08 13 37.58 +06 56.1 0.179 1.118 121.3 50.8 14.2
2005 06 09 13 31.57 +07 23.6 0.173 1.109 118.9 53.3 14.1
2005 06 10 13 25.19 +07 52.0 0.167 1.100 116.4 55.8 14.0
2005 06 11 13 18.40 +08 21.5 0.161 1.090 113.8 58.5 13.9
2005 06 12 13 11.18 +08 52.0 0.156 1.081 111.1 61.2 13.8
2005 06 13 13 03.48 +09 23.7 0.150 1.072 108.2 64.1 13.7
2005 06 14 12 55.25 +09 56.5 0.145 1.063 105.2 67.2 13.6
2005 06 15 12 46.44 +10 30.4 0.140 1.054 102.1 70.4 13.5
2005 06 16 12 37.00 +11 05.5 0.135 1.045 98.9 73.8 13.3
2005 06 17 12 26.87 +11 41.7 0.131 1.037 95.4 77.3 13.2
2005 06 18 12 16.00 +12 18.7 0.126 1.028 91.8 81.1 13.1
2005 06 19 12 04.34 +12 56.5 0.122 1.019 88.1 85.1 13.0
2005 06 20 11 51.84 +13 34.6 0.118 1.011 84.1 89.2 12.9
2005 06 21 11 38.47 +14 12.6 0.115 1.002 79.9 93.6 12.8
2005 06 22 11 24.20 +14 49.9 0.112 0.994 75.5 98.2 12.7
2005 06 23 11 09.06 +15 25.8 0.109 0.986 70.9 103.0 12.6
2005 06 24 10 53.08 +15 59.6 0.107 0.978 66.2 108.1 12.6
2005 06 25 10 36.35 +16 30.2 0.105 0.970 61.3 113.3 12.5
2005 06 26 10 18.97 +16 56.8 0.104 0.963 56.2 118.6 12.4
2005 06 27 10 01.12 +17 18.6 0.103 0.955 51.1 124.1 12.4
2005 06 28 09 43.00 +17 34.9 0.103 0.948 45.9 129.6 12.3
2005 06 29 09 24.82 +17 45.3 0.104 0.940 40.8 135.1 12.3


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