Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6973: JUNE BOOTID METEORS 1998; C/1998 M5

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6972 SEARCH Read IAUC 6974

View IAUC 6973 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 6973
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


JUNE BOOTID METEORS 1998
     P. Spurny and J. Borovicka, Ondrejov Observatory, write:  "In
only one hour of clear sky, we photographed two bright meteors that
were undoubtedly connected with the enhanced activity of the June
Bootids (cf. IAUC 6954, 6966).  A slow-moving fireball of maximum
absolute (100-km distance) mag -7.9 was photographed by three
fish-eye cameras and one long-focus spectral camera at two Czech
stations of the European fireball network on June 27.89102 UT.  The
meteoroid (initial photometric mass 0.14 kg) traveled on a
relatively short 18.15-km luminous trajectory in 1.1 s, terminating
its light at a height of 72.2 km.  Judging from its behavior in the
atmosphere, this meteoroid was of the most fragile, typically
cometary type IIIB, strongly resembling the October Draconid
material.  The position of the apparent radiant was R.A. = 227.15
+/- 0.08 deg, Decl. = +48.47 +/- 0.05 deg, and the initial velocity
was 17.9 +/- 0.3 km/s.  The corresponding geocentric radiant and
orbital elements (all for equinox J2000.0) are R.A. = 222.88 +/-
0.16 deg, Decl. = +47.60 +/- 0.06 deg, geocentric velocity 14.1 +/-
0.4 km/s, a = 3.3 +/- 0.3 AU, e = 0.69 +/- 0.03, q = 1.01577 +/-
0.00005 AU, Peri. = 183.65 +/- 0.07 deg, Node = 96.04559 +/-
0.00003 deg, i = 18.4 +/- 0.4 deg.  It is evident that this
heliocentric orbit corresponds to the orbit of comet
7P/Pons-Winnecke."


COMET C/1998 M5 (LINEAR)
     Ephemeris (cf. IAUC 6961) from orbital elements on MPEC
1998-O04:

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July 16    22 58.82   +23 19.0   2.370   2.937  114.2   18.4   12.1
     21    22 53.09   +25 11.0   2.273   2.892  118.0   18.1   11.9
     26    22 46.15   +27 05.0   2.181   2.847  121.6   17.7   11.7
     31    22 37.89   +28 59.8   2.097   2.803  124.8   17.3   11.6
Aug.  5    22 28.21   +30 53.5   2.020   2.758  127.5   17.0   11.4
     10    22 17.08   +32 43.9   1.953   2.714  129.6   16.7   11.3
     15    22 04.46   +34 28.3   1.894   2.670  130.9   16.7   11.2
     20    21 50.45   +36 03.7   1.846   2.626  131.3   16.8   11.0
     25    21 35.21   +37 27.1   1.807   2.583  130.8   17.2   10.9
     30    21 19.05   +38 36.0   1.778   2.540  129.3   17.9   10.8
Sept. 4    21 02.33   +39 28.7   1.759   2.498  126.9   18.8   10.7

     Visual m_1 estimates:  July 16.97 UT, 12.8 (R. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 18.91, 12.0 (M.
Lehky, Hradec Kralove, Czech Rep., 0.42-m refl.); 19.99, 11.9 (R.
Haver, Rieti, Italy, 0.15-m refl.).

                      (C) Copyright 1998 CBAT
1998 July 21                   (6973)            Daniel W. E. Green

Read IAUC 6972 SEARCH Read IAUC 6974

View IAUC 6973 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!