(meteorobs) Meteor Activity Outlook for November 5-11, 2011 - AND (Bielids)
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metpaper at Safe-mail.net
Sat Nov 5 07:29:09 EDT 2011
-------- Original Message --------
From: Robert Lunsford <lunro.imo.usa at cox.net>
> The following showers are expected to be active this week:
>
> Remnants from the famous Andromedid (AND) shower, noted for intense storms during the 19th century, may still be seen throughout November. The current position of this large radiant is 01:26 (022) +27. This position lies in a sparse area of northeastern Pisces. The nearest bright star is third magnitude Alpha Trianguli, which lies five degrees to the northeast. The radiant is so diffuse that Andromedid meteors may be seen coming from southern Andromeda, Triangulum, and northwestern Aries as well as eastern Pisces. Visual activity is expected to be low, but detectable. An inconspicuous maximum occurs on November 12. The Andromedid meteors are best seen near 2200 (10pm) LST (Local Standard Time), when the radiant lies on the meridian. At 19km/sec., the average Andromedid will appear as a very slow moving meteor.
>
> Andromedids (AND) - 01:26 (022) +27 Velocity - 19km/sec.
> Northern Hemisphere - <1 per hr. Southern Hemisphere - <1 per hr.
A few month back I was playing with the Sonotaco public database of meteor orbits against cometary orbits using d criteria assessment.
One of the things I tried for was matching the orbits for the early apparitions of 3D/Biela, the parent comet(s) against the dataset.
A very wide and sparse set of radiants dropped out, most of which Sonotaco identifies as sporadics, because they are quite a bit to the North and about ten days to a fortnight later than the above current traditional radiant.
Certainly in 2008 (leap year) and 2009 there seem to be two discrete radiant centres, one for 1846II, old style nomencalture, (the final orbit for the comet(s)), a bit sparser with about half a dozen objects around the 13th to 15th November, average radiant about 1h 32m and +34d, and a more populated one mostly concentrated around the orbit for the 1826I (old style) orbit, although with a couple of 1832II orbits tucked amongst those. they range from the 20th to the 29th of the month, but more concentratedly about the 23rd and 26/7th, an average but somewhat diffuse radiant centred nearer around 1h 55m and +44d.
Detected objects were in the magnitude ranges 0 to 1, some just managing negative magnitude. so quite bright.
Below are some particulars, mostly taken form the Sonotaco database with the sexagesimal coords for the radiants in the end columns added by myself. Note the stream identifiers are the SonotaCo conclusions which I believe are mostly based on radiant clustering. They're sorted on Solar Longitude. The orbital statistics route adds quite a few sporadics into this identified list.
These "Bielid" style past orbits seem to be quite some way North in Andromeda compared to the modern radiant quoted above.
Cheers
John
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COMET Local Time Solar Long ra dec VG STR MAG Y_UT M_UT D_UT H_UT M_UT S_UT RA Dec
3D/1846II 20081113_180856 231.241425 19.247665 32.767727 16.62 And -1.6 2008 11 13 9 8 56 1h 17m 32d 46'
3D/1846II 20081113_214204 231.390335 23.916182 32.251587 16.94 And 0.2 2008 11 13 12 42 4 1h 36m 32d 15'
3D/1846II 20081114_021755 231.583099 27.488768 38.775536 17.70 spo 2.3 2008 11 13 17 17 55 1h 50m 38d 47'
3D/1846II 20081114_182505 232.259079 19.587219 33.948124 16.79 And -0.2 2008 11 14 9 25 5 1h 18m 33d 57'
3D/1846II 20091115_202617 233.096939 22.193745 35.561131 18.20 And 1.4 2009 11 15 11 26 17 1h 29m 35d 34'
3D/1846II 20091118_212513 236.163239 25.928181 33.357391 15.93 And 0.4 2009 11 18 12 25 13 1h 44m 33d 21'
3D/1832II 20091119_230426 237.241516 26.957870 37.484402 15.69 spo 0.0 2009 11 19 14 3 47 1h 48m 37d 29'
3D/1826I 20071121_014059 237.868378 27.969604 41.812691 16.30 spo 0.6 2007 11 20 16 40 59 1h 52m 41d 49'
3D/1832II 20081120_192630 238.350845 23.567938 37.716297 15.78 spo -0.1 2008 11 20 10 26 31 1h 34m 37d 43'
3D/1826I 20081121_025330 238.664276 31.958906 41.294239 16.64 spo 1.6 2008 11 20 17 53 31 2h 8m 41d 18'
3D/1826I 20081121_185926 239.341766 23.376368 38.899670 15.70 spo -1.7 2008 11 21 9 59 26 1h 34m 38d 54'
3D/1826I 20081121_194945 239.377060 23.452829 39.044624 16.31 spo -0.4 2008 11 21 10 49 46 1h 34m 39d 3'
3D/1826I 20081121_224512 239.500137 28.202797 39.214863 16.17 spo 1.7 2008 11 21 13 45 12 1h 53m 39d 13'
3D/1826I 20071122_180656 239.569077 22.310310 41.605503 17.13 spo 0.6 2007 11 22 9 6 57 1h 29m 41d 36'
3D/1826I 20081122_221824 240.491791 27.777971 35.939442 15.84 And -0.4 2008 11 22 13 18 24 1h 51m 35d 56'
3D/1832II 20091123_184943 241.103653 21.953735 40.598202 17.75 spo 1.2 2009 11 23 9 49 44 1h 28m 40d 36'
3D/1826I 20091123_205959 241.195084 25.538950 40.973289 15.38 spo 0.1 2009 11 23 11 59 59 1h 42m 40d 58'
3D/1826I 20091123_221320 241.246567 28.767086 43.529675 16.07 spo 0.4 2009 11 23 13 13 20 1h 55m 43d 32'
3D/1826I 20091124_023926 241.433350 35.612617 46.239655 16.37 spo 1.5 2009 11 23 17 39 26 2h 22m 46d 14'
3D/1826I 20081124_234746 242.576843 32.973404 39.854996 16.17 spo 0.6 2008 11 24 14 47 46 2h 12m 39d 51'
3D/1826I 20091126_193344 244.168182 24.513109 42.339397 16.50 spo 0.9 2009 11 26 10 33 44 1h 38m 42d 20'
3D/1826I 20081126_180447 244.359741 20.282713 42.800735 16.45 spo 0.3 2008 11 26 9 4 47 1h 21m 42d 48'
3D/1832II 20081126_183812 244.383224 28.199640 43.165092 18.47 spo 0.8 2008 11 26 9 38 12 1h 53m 43d 10'
3D/1826I 20091127_005040 244.390839 27.433918 47.786285 15.10 spo 0.9 2009 11 26 15 50 40 1h 50m 47d 47'
3D/1826I 20091127_005623 244.394852 34.212894 45.563751 16.02 spo 1.2 2009 11 26 15 56 23 2h 17m 45d 34'
3D/1826I 20091127_221327 245.292236 28.830107 47.866081 16.19 spo -0.2 2009 11 27 13 13 27 1h 55m 47d 52'
3D/1826I 20091128_034032 245.522110 32.371162 49.947620 15.30 spo 1.1 2009 11 27 18 40 32 2h 9m 49d 57'
3D/1826I 20091129_013314 246.444809 36.713348 47.708897 16.39 spo 2.3 2009 11 28 16 33 14 2h 27m 47d 43'
3D/1826I 20081129_025827 246.760574 34.086914 48.640430 15.32 spo 3.2 2008 11 28 17 58 27 2h 16m 48d 38'
3D/1826I 20081130_022306 247.749039 33.133446 48.536770 14.43 spo 1.1 2008 11 29 17 23 6 2h 13m 48d 32'
3D/1826I 20071204_211053 251.845093 32.548908 40.603992 14.52 spo 0.7 2007 12 4 12 10 53 2h 10m 40d 36'
3D/1772 20091207_193223 255.314072 23.577263 48.745548 14.44 spo 1.1 2009 12 7 10 32 24 1h 34m 48d 45'
3D/1772 20071211_234929 259.067780 37.004375 49.883102 15.10 spo -0.9 2007 12 11 14 49 29 2h 28m 49d 53'
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