J/A+A/287/990 Meteor stream activity. (Jenniskens 1994)
Meteor stream activity. 1. The annual streams.
Jenniskens P.
<Astron. Astrophys. 287, 990 (1994)>
=1994A&A...287..990J 1994A&A...287..990J
ADC_Keywords: Comets
Keywords: meteor: meteoroids - comets: general
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3a 77 50 Catalogue of meteor streams
table3b 138 50 Properties related to the activity curve of
the meteor streams
table3c 135 6 Results for activity profiles with a
background component
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Byte-per-byte Description of file: table3a
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Bytes Format Units Label Explanations
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1- 4 A4 --- Code code name
6- 27 A22 --- Name common name of the stream
28- 30 I3 deg lo solar longitude for which radiant position
is valid
32- 34 I3 deg RAdeg right ascension of radiant
36- 38 I3 deg DEdeg declination of radiant
40- 43 F4.1 --- dRA radiant drift in right ascension (degree
of arc per degree of solar longitude)
45- 48 F4.1 --- dDE radiant drift in declination
50- 51 I2 km/s Vinf geocentric entry velocity of meteoroids in the
atmosphere, which includes the Earth's
gravitational acceleration
52 A1 --- n_Chi [*] when *, Chi varies with solar longitude
53- 55 F3.1 --- Chi magnitude distribution index
(sporadic meteors Chi = 3.4)
57- 61 I5 --- N total number of meteors observed of this stream
63- 66 I4 h Neff total number of effective observing time
74- 75 I2 --- Nobs ? number of observers that contributed to
data of this stream
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Byte-per-byte Description of file: table3b
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name abbreviation name
6- 11 F6.2 deg lo(max) ? solar longitude of peak position (from
intersection point of slopes fitted to
the data). Equinox 1950.0 (1)
12 A1 --- u_lo(max) [)] when ')', the values are for an assumed
semi-major axis
13- 16 F4.2 deg e_lo(max) ? rms uncertainty on lo(max)
19 A1 --- l_ZHRmax limit flag on ZHRmax
20- 24 F5.1 h-1 ZHRmax peak rate (Zenith Hourly Rates) (1), (2)
25 A1 --- u_ZHRmax [)] when ')', the values are for an assumed
semi-major axis
29- 32 F4.1 h-1 e_ZHRmax ? rms uncertainty on ZHRmax
35- 39 F5.3 deg-1 B ? slope of ascending and descending
branches (1)
40 A1 --- u_B [)] when ')', the values are for an assumed
semi-major axis
41 A1 --- n_B note on the slope B (4)
44- 48 F5.3 deg-1 e_B ? rms uncertainty on the slope B
53- 58 F6.2 yr P ? mean orbital period of meteoroids. (3)
59 A1 --- n_P [ :*i] : is an uncertainty flag on P
* means that P is orbital period of
parent comet
i means infinity
60- 63 F4.2 AU q perihelion distance
66- 68 I3 deg i inclination of the orbit with respect
to the ecliptic
71- 73 I3 deg Pi longitude of perihelion (sum of argument of
perihelion (small omega) and the ascending
node (large omega))
76- 81 F6.3 g M(0) ? mass of zero magnitude meteor
83 A1 --- l_Rho limit flag on Rho
84- 89 F6.3 10-24g/cm3 Rho density of matter in the peak of the
meteoroid stream
90 A1 --- u_Rho [)] when ')', the values are for an assumed
semi-major axis
94- 98 F5.3 10-24g/cm3 e_Rho ? rms uncertainty on the density Rho
101 A1 --- l_M1yr limit flag on the mass M1yr
102-108 F7.4 10+14g M1yr ? total mass in a flux tube of length 1
year times heliocentric velocity
109 A1 --- u_M1yr [)] when ')', the values are for an assumed
semi-major axis
113-119 F7.4 10+14g e_M1yr ? rms uncertainty on the mass M1yr
122 A1 --- l_Mtot limit flag on the mass Mtot
123-128 F6.3 10+15g Mtot ? total mass estimate (Mtot = M1yr x P)
129 A1 --- n_Mtot when *, value of Mtot is for an assumed
period P = 20 yr. These streams lack
photographically determined orbits
133-137 F5.3 10+15g e_Mtot ? rms uncertainty on the mass Mtot
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Note (1): ZHR = ZHRmax 10^( -B |lo - lo(max)|)
Note (2): The peak rate is in number per hour that can be seen by a standard
observing in perfectly clear sky (star limiting magnitude = 6.5) and
a radiant position in the zenith.
Note (3): The average of the mean orbital period of meteoroids is over 1/a,
where a is the semi-major axis of photographically determined orbits
in the literature.
Note (4): a: for Boo, B = 1.8 (4)
b: for Gem, B = 0.39(4)/0.72(10)
Values between brackets are for assumed semi-major axis
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Byte-per-byte Description of file: table3c
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name abbreviation name
6- 11 F6.2 deg lo(max) solar longitude of peak position 1950.0
14- 18 F5.1 h-1 ZHRmax(p) peak rate for the main peak
20- 23 F4.1 h-1 e_ZHRmax(p) rms uncertainty on ZHRmax
25 A1 --- l_Bp [ ~] limit flag on the slope Bp
26- 29 F4.2 deg-1 Bp ? slope of ascending and descending
branches for the main peak
30 A1 --- n_Bp note on the slope Bp (1)
38- 41 F4.2 deg-1 e_Bp ? rms uncertainty on the slope Bp
43 A1 --- l_Mtot(p) [ ~] limit flag on the mass Mtot(p)
44- 50 F7.4 10+15g Mtot(p) total mass estimate for the main peak
53- 58 F6.4 10+15g e_Mtot(p) ? rms uncertainty on the mass Mtot(p)
60- 63 F4.1 h-1 ZHRmax(b) peak rate for the background
66- 68 F3.1 h-1 e_ZHRmax(b) rms uncertainty on ZHRmax(b)
70- 74 F5.3 deg-1 Bb+ slope of ascending branch
77- 81 F5.3 deg-1 e_Bb+ rms uncertainty on the slope Bb+
84 A1 --- l_Bb- [ ~>] limit flag on the slope Bd-
85- 89 F5.3 deg-1 Bb- slope of descending branch
92- 96 F5.3 deg-1 e_Bb- ? rms uncertainty on the slope Bb-
100-105 F6.3 10+15g Mtot(b) total mass estimate for the background
108-112 F5.3 10+15g e_Mtot(b) rms uncertainty on the mass Mtot(b)
114-116 F3.1 --- Mb/Mp background to main peak mass ratio
119-121 F3.1 --- e_Mb/Mp rms uncertainty on Mb/Mp
123-128 F6.3 10+15g Mtot total mass estimate
131-135 F5.3 10+15g e_Mtot rms uncertainty on the mass Mtot
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Note (1): a: For Gem, Bp = (0.59/0.81) ±0.07
Values between brackets are for assumed semi-major axis
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Historical Notes:
* 04-Mar-1994 : Description Standardized at CDS (Patricia Bauer)
* 19-Dec-1995 : ReadMe file revisited
(End) Patricia Bauer [CDS] 19-Dec-1995