Central Bureau for Astronomical Telegrams
IAUC 2261: 1970f; 1969b; NOTICE RE PRECISE POSITIONS OF COMETS
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Read IAUC 2262
Circular No. 2261
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
COMET WHITE-ORTIZ-BOLELLI (1970f)
Mr. Z. M. Pereyra, Cordoba Observatory for the CNEGH, provides
the following precise positions. Both plates were measured by Miss
B. Oviedo and Mr. J. J. Rodriguez. Apparently the tail was still
more than 2o long.
1970 UT R. A. (1950) Decl. Mag.
June 5.93305 6 05 44.95 + 8 49 54.8 8.0
6.93339 6 08 44.66 + 8 35 32.6 8.5
The following parabolic elements, by the undersigned, satisfy
the six precise positions May 23.964 to June 6.933 within 2". The
direction of perihelion is L = 282o.26, B = +35o.08 (equinox 1950.0).
T = 1970 May 14.4859 ET Peri. = 61.2935
Node = 336.3186 1950.0
q = 0.008879 AU Incl. = 139.0652
The positions in the following ephemeris are not expected to
be in error by more than about 3'. The magnitude, calculated from
12.0 + 5 log Delta + 10 log r, refers to the central condensation, this
formula being consistent with E. Roemer's final magnitude estimates
for another member of the Kreutz sungrazing group, comet 1963 V.
Comet 1970f could well be rather fainter.
1970 ET R. A. (1950) Decl. Delta r Mag.
Aug. 2 7 41.19 - 0 31.4 2.906 2.025 17.4
12 7 50.54 - 1 59.8
22 7 58.54 - 3 30.3 3.119 2.354 18.2
Sept. 1 8 05.19 - 5 03.4
11 8 10.44 - 6 39.1 3.238 2.660 18.8
21 8 14.21 - 8 17.2
Oct. 1 8 16.36 - 9 57.0 3.278 2.951 19.3
11 8 16.73 -11 37.5
21 8 15.17 -13 16.9 3.263 3.227 19.7
31 8 11.51 -14 52.8
Nov. 10 8 05.67 -16 22.0 3.227 3.492 20.0
20 7 57.64 -17 40.5
30 7 47.57 -18 43.7 3.217 3.748 20.3
Dec 10 7 35.82 -19 27.3
20 7 22.97 -19 47.9 3.279 3.995 20.6
30 7 09.73 -19 44.0
COMET KOHOUTEK (1969b)
The following precise positions have been received from T.
Seki, Kochi Observatory, and A. Mrkos, Klet Observatory:
1970 UT R. A. (1950) Decl. Observer
May 11.46622 6 20 59.31 +43 41 19.3 Seki
24.86473 6 48 41.66 +37 20 46.6 Mrkos
Continuation to the ephemeris on IAUC 2199:
1970/71 ET R. A. (1950) Decl. Delta r Mag.
Sept.11 8 50.62 + 2 05.4 3.511 2.760 17.1
21 8 56.17 - 0 51.5
Oct. 1 9 00.53 - 3 51.9 3.461 2.941 17.4
11 9 03.52 - 6 55.9
21 9 04.94 -10 03.3 3.368 3.125 17.6
Nov. 1 9 04.56 -13 13.3
10 9 02.12 -16 23.9 3.259 3.310 17.8
20 8 57.41 -19 31.7
30 8 50.23 -22 32.2 3.170 3.495 17.9
Dec. 10 8 40.54 -25 19.2
20 8 28.51 -27 45.6 3.142 3.681 18.1
30 8 14.58 -29 44.6
Jan. 9 7 59.47 -31 11.0 3.209 3.865 18.4
19 7 44.15 -32 02.6
29 7 29.59 -32 20.9 3.385 4.049 18.7
Feb. 8 7 16.65 -32 10.7
18 7 05.89 -31 38.7 3.660 4.232 19.1
28 6 57.56 -30 52.1
Mar. 10 6 51.70 -29 57.6 4.008 4.413 19.5
20 6 48.14 -29 00.9
30 6 46.64 -28 06.1 4.396 4.593 19.8
Apr. 9 6 46.94 -27 16.4
19 6 48.74 -26 34.0 4.794 4.772 20.2
29 6 51.80 -26 00.2
May 9 6 55.88 -25 35.8 5.176 4.949 20.5
The magnitude, calculated from 10.0 + 5 log Delta + 10 log r, refers to
the central condensation.
NOTICE REGARDING PRECISE POSITIONS OF COMETS
We draw attention again to the remark on IAUC 1983 concerning
our desire to limit the number of positions of comets published on
these Circulars. We wish, in general, to give not more than two
positions per observatory per comet per night.
1970 July 9 (2261) Brian G. Marsden
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