Access to Astronomical Catalogues

← Click to display the menu
J/A+A/295/206                     Meteor stream activity. II. (Jenniskens, 1995)

Meteor stream activity. II. Meteor outbursts Jenniskens P. <Astron. Astrophys. 295, 206 (1995)> =1995A&A...295..206J (SIMBAD/NED Reference)
ADC_Keywords: Minor planets Keywords: meteors: meteoroids Description: In the past two centuries, alert amateur and professional meteor astronomers have documented 35 outbursts of 17 individual meteor streams well enough to allow the construction of a homogeneous set of activity curves. These curves add to similar profiles of the annual streams in a previous paper (Paper I, See Cat. J/A+A/287/990). The activity curves, expressed in terms of Zenith Hourly Rates (ZHR), have a shape that is usually well described by: ZHR=ZHR(max)10^(-B|λ_{sun }-{lambda☉_(max)}|)^. The steepness of the slopes varies from an exponent of B=7 to B=220 per degree of solar longitude, with a typical value of B=30. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a.dat 94 49 Catalogue of meteor outburst events that occurred between 1793 and 1993 table1b.dat 118 49 Parameters that describe the main peak in the activity curve table1c.dat 80 12 Parameters that describe the background component in the activity curve
See also: J/A+A/287/990 : Meteor stream activity I. (Jenniskens 1994) Byte-by-byte Description of file: table1a.dat
Bytes Format Units Label Explanations
1- 2 A2 --- ComType Comet type (1) 5- 7 A3 --- Code Name of the stream in a three letter code 9- 28 A20 --- Name Common name 30- 42 A13 --- Date Date of maximum activity 44- 48 F5.1 deg RAdeg ? True radiant position in equinox 1950.0, corrected for zenith attraction (Earth's gravitational pull) 50- 54 F5.1 deg DEdeg ? True radiant position in equinox 1950.0, corrected for zenith attraction (Earth's gravitational pull) 55 A1 --- u_RAdeg [)] Uncertainty flag on radiant position 56 A1 --- n_RAdeg [*] Note on radiant position 57 A1 --- l_Vinf [~] Limit flag on Vinf 58- 59 I2 km/s Vinf Apparent entry velocity, which is the geocentric entry velocity to which is added the component due to the Earth's gravitational pull: Vinf = sqrt(V_G2 + 11.22) km/s 61- 62 A2 --- l_Chi [=≳ ] Limit flag on Chi 63- 65 F3.1 --- Chi ? Magnitude distribution index, Chi = n(M+1)/n(M). 68- 69 I2 --- Nobs1 ? Number of people who observed the event 70 A1 --- n_Nobs1 [mrs] Note when Nobs1 is not detailed m: many, r: radar, s: several 72 I1 --- Nobs2 ? Number of reports that are useful for evaluating the activity profile 74- 80 F7.1 --- E-C ? Time in days or years that the Earth follows (+) or leads (-) the comet at passing the node 82 A1 --- x_E-C [dy] Units in which E-C is expressed, d = days, y = years 84- 91 F8.5 --- DE-C ? Minimum distance that the comet passes outside (+) or inside (-) the Earth's orbit 93- 94 I2 --- ID Catalogue entry number
Note (1): nc: near-comet type fc: far-comet type u: unknown type
Byte-by-byte Description of file: table1b.dat
Bytes Format Units Label Explanations
1- 2 A2 --- ComType Comet type (1) 5- 6 I2 -- ID Catalogue entry number 9- 11 A3 --- Code Coded name 13- 16 I4 yr Year Year of the event 18- 19 A2 --- l_lomax [<≥∼ ] limit flag on lomax 20- 26 F7.3 deg lomax ? Peak position in terms of solar longitude (Eq. 1950.0) 27 A1 --- n_lomax [)T?] When 'T' the data are in table1c 29- 30 A2 --- l_ZHRmax [≥∼ ] Limit flag on ZHRmax 31- 35 I5 h-1 ZHRmax ? Peak rate (meteors per hour) 36 A1 --- n_ZHRmax [l?] 'l' means 'like rain' 39- 42 I4 h-1 e_ZHRmax ? rms uncertainty on ZHRmax 43 A1 --- u_ZHRmax [)] Uncertainty flag on ZHRmax 45- 46 A2 --- l_Bp [≥≲ ] Limit flag on Bp 47- 51 F5.1 deg-1 Bp ? Slope of ascending (B+) and descending (B-) branches 52 A1 --- n_Bp [-] A '-' indicates an interval for Bp 53- 54 I2 deg-1 Bp2 ? Highest value of Bp when n_Bp = '-' 55- 58 F4.1 deg-1 e_Bp ? rms uncertainty on Bp 60- 61 A2 --- l_dE-C [<≥∼ ] Limit flag on dE-C 62- 67 F6.3 deg dE-C ? Difference between time of maximum activity and the node of the comet dE-C=lomax/Omega_c (or between maximum activity and point of closest approach when n_dE-C = 1 ) 68 A1 --- u_dE-C [)] Uncertainty flag on dE-C 69 I1 --- n_dE-C [1]? When 'n_dE-C' = 1, dE-C is the difference between maximum activity and point of closest approach 70 A1 --- l_Pc [~] Limit flag on Pc 71- 77 F7.2 yr Pc ? Orbital period of the comet 78 A1 --- n_Pc [i] When 'i', the orbital period of the comet is infinity 79- 82 F4.2 AU q ? Perihelion distance (2) 85- 87 I3 deg i ? Inclination of orbit (2) 90- 92 I3 deg w ? Argument of perihelion (2) 95- 99 F5.2 g M0 ? Mass of a zero magnitude meteor 100 A1 --- l_rho [~] Limit flag on 10-24rho 101-107 F7.1 10-24g/cm3 rho ? Density of matter in the peak of the meteoroid stream. (10-24rho) 109 A1 --- l_Mtot [~] Limit flag on Mtot 110-117 F8.6 10+15g Mtot ? Total mass in the stream. I assume cylindrical geometry. Masses are taken to be a factor less than this for near-comet type outbursts, where matter is concentrated near the comet's position. 118 A1 --- u_Mtot [)] Uncertainty flag on Mtot
Note (1): nc: near-comet type fc: far-comet type u: unknown type Note (2): For meteoroids to cross the orbit of the Earth, orbital elements are related according to: a(1-e2) = 1 ± e cos(w). where e = 1-q/a is the eccentricity of the orbit.
Byte-by-byte Description of file: table1c.dat
Bytes Format Units Label Explanations
1- 2 A2 --- ComType Comet type (1) 5- 6 I2 --- ID Identification number 9- 11 A3 --- Code Coded name 13- 16 I4 yr Year Year of observation 19- 25 F7.3 deg lomax Peak position in terms of solar longitude (Eq. 1950.0) 26 A1 --- u_lomax [)] Uncertainty flag on lomax 27 A1 --- l_ZHRmax [~] Limit flag on ZHRmax 28- 33 F6.1 h-1 ZHRmax Peak rate (meteors per hour) 35- 36 I2 h-1 e_ZHRmax ? rms uncertainty on ZHRmax 37 A1 --- u_ZHRmax [)] Uncertainty flag on ZHRmax 39 A1 --- l_Bb+ [~] Limit flag on Bb+ 40- 43 F4.2 deg-1 Bb+ ? Slope of ascending branches 45- 47 F3.1 deg-1 e_Bb+ ? rms uncertainty on Bb+ 51 A1 --- l_Bb- [~] Limit flag on Bb- 52- 54 F3.1 deg-1 Bb- ? Slope of descending branches 56- 58 F3.1 deg-1 e_Bb- ? rms uncertainty on Bb- 60- 65 F6.4 10+15g Mb ? Mass of the background 67- 71 F5.1 --- Mb/Mp ? Ratio of mass in the background component relative to the main peak 75- 80 F6.4 10+15g Mtot ? Sum of mass estimates of background and main peak
Note (1): nc: near-comet type fc: far-comet type u: unknown type

(End) Patricia Bauer [CDS] 04-Nov-1994
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact