SonotaCo Network Video Meteor Observation 2007-2008
J4 vs IAU Working list
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This page was additional information for J4 catalog, sending from SonotaCo to Dr. Peter Jenniskens of IAU C22 chair, within the dicussion of new names and codes on March to April 2009.
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1) AVB #21 SLE#136 vs J4_aVi
The radiant position differs almost 20 deg
The drift direction does not match.
Vg is not so near. (AVB=16.8, SLE=23, J4_aVi=18.7)
-> should be treated as different.
1.1) Concentration of J4_aVi
this figure shows the all radiants on April 20th to May 8 in two years.
J4_aVi shows a compact concentration compared with spordics around . There were 16 meteors.
The criterion I used was more than 10 meteors over the 39208 meteors.
Therefore I recognized this as an shower.
The dift values are not reliable, because 12 of 16 meteors appears only two nights of April 29 and April 30.
2) NIA #33 vs J4_bPs
sol = 139.5
sol=147.0
The radiant position differs more than 20 deg at sol=147.0 (the peak of NIA)
Vg differs a lot (NIA=27.6 J4_bPs=38.3)
-> should be treated as different.
3) DAD #334 (J4_aDr) vs KDR #336 (J4_kDr)
J4_kDr is a bit faster than J4_aDr.
J4_kDr is compact and appears a lot in a short time period.
While J4_aDr is diffused and has a long time period.
The drift direction and the position of a night do not match.
-> should be treated as different.
4) KCG #12, ODR#88 vs J4_kCg
I cannot say anything about this.
May be KCG is defused and the activity differs very much depend on the year.
5) Concentration of J4_gDr
These figures show the all radiants of July 25 to Aug 1 of two years.
The concentration of J4_gDr was compact and clear. There were 22 meteors.
J4_gDr appears only in a few nights. Therefore its drift has not much meanings.
May be this cluster was treated as one of a cluster of early appearance of KCG. And it might be deffrent from GDR#184 in the IAU working list.
The handling of KCG group is very difficult, but I thought this early concentration can be treated as independent one.
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On 2009 April 8 Dr. Peter Jenniskens decides following IAU names and codes.
| SonotaCo | IAU proposition | |||||
| no. | code | name | # | code | name | memo |
| 1 | J4_aDr | alpha Draconids | 334 | DAD | December Alpha Draconids | newly added to
Working list |
| 2 | J4_cVi | chi Virginids | 335 | XVI | December Chi Virginids | |
| 3 | J4_kDr | kappa Draconids | 336 | KDR | December Kappa Draconids | |
| 4 | J4_nEr | nu Eridanids | 337 | NUE | Nu Eridanids | |
| 5 | J4_oEr | omicron Eridanids | 338 | OER | Omicron Eridanids | |
| 6 | J4_pUm | psi Ursae Majorids | 339 | PSU | Psi Ursae Majorids | |
| 7 | J4_tPy | theta Pyxids | 340 | TPY | Theta Pyxidids | |
| 8 | J4_xUM | xi Ursae Majorids | 341 | XUM | Xi Ursae Majorids | |
| 9 | J4_bPs | beta Piscids | 342 | BPI | August Beta Piscids | |
| 10 | J4_aVi | alpha Virginids | 343 | HVI | h Virginids | |
| 11 | J4_gDr | gamma Draconids | 344 | JUG | July Gamma Draconids | |
| 12 | J4_aHy | alpha Hydrids | 331 | AHY | Alpha Hydrids | already in
Working list |
| 13 | J4_eEr | eta eridanids | 191 | ERI | Eta Eridanids | |
| 14 | J4_rPe | rho Perseids | 208 | SPE | September Perseids | |
| 15 | J4_tUm | tau Ursae Majorids | 333 | OCU | October Ursae Majorids | |
From now on, IAU proposition codes and name should be used.
J4 catalog will be updated to J5 catalog using new codes and names.
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