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Post Info TOPIC: Comet C/2007 W1 (Boattini)
Blobrana


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The Daytime Craterids
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Title: The Daytime Craterids, a radar-detected meteor shower outburst from hyperbolic comet C/2007 W1 (Boattini)
Authors: Wiegert, P. A.; Brown, P. G.; Weryk, R. J.; Wong, D. K.

We report a new daytime meteor shower detected with the Canadian Meteor Orbit Radar (CMOR). This shower has a radiant in the southern constellation Crater. The Daytime Craterid shower was observed in 2003 and 2008 but not in any of the other years in the 2002-09 interval. The strength of this shower in the years observed is equivalent to a daily averaged zenithal hourly rate (ZHR) over 30, with a peak ZHR likely much higher at the time of the outburst. The orbital elements of the shower closely match those of Comet C/2007 W1 (Boattini), which passed perihelion in 2007. The orbit of C/2007 W1 is nominally hyperbolic orbit making this the first meteor shower detected from a clearly unbound comet. The 2003 outburst of the Daytime Craterid shower indicates that this comet must have recently been transferred to an unbound orbit from a bound one, likely through a close encounter with a giant planet. As a result we conclude that this shower provides us with one of the few examples of showers originating from the population of nearly isotropic comets. The stream is difficult to model owing to its proximity to the orbits of Jupiter, Saturn and the Earth. However, the intermittent nature of the shower can be largely understood from numerical simulations. No outbursts of similar strength are expected in the next decade, with the possible exception of 2015.

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Blobrana


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RE: Comet C/2007 W1 (Boattini)
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Ephemeris
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1
2008 07 03    03 37.98   +00 39.1    0.299    0.863    51.5   112.8   6.2
2008 07 08    03 22.27   +04 42.8    0.336    0.884    57.7   103.6   6.6
2008 07 13    03 11.36   +08 07.9    0.374    0.914    63.6    94.9   7.0
2008 07 18    03 03.61   +11 01.5    0.412    0.951    69.1    87.0   7.4
2008 07 23    02 57.76   +13 29.7    0.448    0.995    74.5    79.8   7.7
2008 07 28    02 52.89   +15 37.1    0.482    1.044    79.8    73.2   8.1


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Blobrana


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Comet C/2008 W1 Boattini



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Blobrana


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Comet C/2007 W1 (Boattini) continues to brighten faster than predicted, and has now reached about 6th magnitude. That's bright enough that you can see it without optical aid under excellent conditions, and it should be a relatively easy target through binoculars. The comet currently lies low in the southwestern sky after darkness falls, but it won't stay there long.
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Blobrana


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2007 w1-2008-5-3-19h20m

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Blobrana


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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1
2008 05 04    10 41.25   -21 58.7    0.388    1.259   122.3    42.6   8.4
2008 05 09    10 21.35   -22 43.0    0.356    1.198   113.8    50.4   8.0
2008 05 14    09 59.42   -23 29.6    0.326    1.140   105.1    58.9   7.6
2008 05 19    09 34.58   -24 17.2    0.297    1.084    95.9    68.2   7.2
2008 05 24    09 05.52   -25 00.1    0.271    1.031    86.3    78.5   6.8
2008 05 29    08 30.54   -25 25.5    0.247    0.983    76.0    89.9   6.4
2008 06 03    07 48.14   -25 08.6    0.228    0.941    65.0   102.3   6.0
2008 06 08    06 58.46   -23 34.1    0.214    0.906    53.9   115.1   5.7
2008 06 13    06 05.03   -20 13.3    0.210    0.878    44.4   125.9   5.5
2008 06 18    05 14.43   -15 16.2    0.218    0.859    39.5   131.2   5.5
2008 06 23    04 32.34   -09 36.3    0.236    0.850    40.4   129.2   5.7
2008 06 28    04 00.59   -04 08.7    0.265    0.852    45.3   121.9   5.9


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Blobrana


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The comet is expected to reach magnitude 4.5 in late June  when it passes 8.5 from the Sun.

 MPC 62271

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jtpa2j


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Thank you!

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Blobrana


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Hi,
sry for the late reply (i was partying hard).

Yeah, the comet is moving through Virgo towards the constellation Corvus just now.
I have includes a picture that shows the coordinates from Nov 26th to Dec 26th...

Comet C2007 W1 (Boattini)

Comet C2007 W1.kmz
Google sky file (2kb, kmz)

-- Edited by Blobrana at 14:46, 2008-01-12

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jtpa2j


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Sorry for my ignorance, but exactly WHERE is the comet? Can you give me a reference constellation?

Thanks,

Jeff

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