Meteor Shower / Cluster Data Format v0.19 13/Apr/2021 SonotaCo

[format outline]
 - comma separated csv file with suffix '.jx.csv'
 - contains shower records and/or short period cluster records
 - 1 independent record / 1 line
 - 7bit ascii character
 - unit of the angle is degree in decimal
 - equinox J2000

[columns]
mark,text
  "A": major shower record
  "B": minor shower record
  "C": possible shower record
  "D": deleted shower record
  "a": major shower short term cluster record
  "b": minor shower short term cluster record
  "c": possible short term cluster record
  "d": deleted cluster

code,text
  shower 
    XXX_ss
      XXX:  iau shower code( 'AAA' to 'ZZZ' )
        ss: suffix - shower data identifier
             'ia'to'iz'  : IAU MDC 
             'ja'to'jz'  : J14
             'j4'to J5   : J4,J5 

  short term cluster of the shower
    XXX_ss_nnn
      nnn: Ls , degree, integer
  
  temporal shower
   lrdvs
        l: Ls (0-z, 0 degree origin, 10 degree step)
        r: ra (0-z, 0 degree origin, 10 degree step)
        d: de (0-z,90deg origin, 5  degree step)
        v: vg (0-z,  0km origin, 2 km/s step)
        s:  suffix (data identifier for a same code in a catalog 'a'to'z')
 
  temporal shower cluster
   _lrdvs_nnn
  
index: _lrdv

lsp: peak(or center) solar longitude(Ls)of the shower(or the cluster). Origin of dra,dde,dvg, degree, decimal
ls1: begin Ls, degree, decimal
ls2: end Ls, degree, decimal

ra: right ascension of radiant, degree, decimal
de: declination of radiant, degree, decimal
vg: geocentric velocity, km/s, decimal

dra: ra component of 2 dimension moving vector of the radiant at Lsp, ra degree/day, decimal
dde: de component of 2 dimension moving vector of the radiant at Lsp, de degree/day, decimal
dvg: vg difference at lsp, km/s/day, decimal

a: semimajor axis, AU, decimal
q: periapsis, AU, decimal 
e: orbital eccentricity, ,decimal
peri: argument of perihelion, degree, decimal
node: longitude of the ascending node, degree, decimal
incl: inclination, degree, decimal

sdr: standard deviation of the radiant direction distribution (1 sigma of cluster radius on the equational coordinate), degree, decimal
sdv: standard deviation of the geocentric velocity, km/s, decimal
sdd: standard deviation of the DD',, decimal
sig: significance of the 3 sdr cluster against sporadic meteors, sigma, decimal (Peak cluster sig value for shower)

ip: peak intensity (ns / all meteor count on lsp, [0..1],decimal), ns / all count on ls1-ls2 for shower
ns: number of the shower meteors in the period of ls1-ls2,,integer

data source: text
activity: yearly activity, annual or year of appearance, text (quoted from IAU MDC)
spectrum: spectrum type, text
explosion: explosion type, text
parent: parent body, text (quoted from IAU MDC)

iau no: shower number, integer 
iau name : shower name, text
similar codes: similar(possible involved) shower codes , text
remark: text
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