Central Bureau for Astronomical Telegrams
IAUC 1907: 1965d; 1866 I; 1948 EA
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Read IAUC 1908
Circular No. 1907
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
POSSIBLE COMET VAN BIESBROECK (1965d)
Three additional observations by K. Tomita of the object
reported in IAUC 1906 have been cabled by Dr. H. Hirose. Since
the object is somewhat brighter than expected, and not precisely
following the predicted trajectory, the identification with
Periodic Comet Van Biesbroeck (1954 IV) is uncertain.
1965 R.A. (1950.0) Decl. Mag.
May 1.63889 11 46 31.46 + 6 30 56.8 17
6.48970 11 45 37.39 + 6 35 13.0 17
7.53681 11 45 29.11 + 6 35 34.5 17
COMET TEMPEL-TUTTLE (1866 I)
Dr. Joachim Schubart, Astronomisches Rechen-Institut, writes:
"I have made an attempt to get a prediction for the return of
Comet Tempel-Tuttle, 1866 I, which is related to the Leonid
meteor stream. Identity with the Chinese Comet of 1366 was
assumed. With several hypotheses for the period the comet was
computed back from 1866 over 15 revolutions under the influence
of the sun and the outer planets. A first reliable orbit could
be derived from this, which pointed to good observing conditions
in 1699. An observation by G. Kirch from 1699 Oct. 26 can be
well represented by a second orbit close to the first. Elements
for 1965 and an ephemeris are given here from the second orbit on
a separate sheet. The variation, if added with the sign given,
leads back to the first orbit. It corresponds to Delta T about -6 d and
gives an estimate of the uncertainty of the method. Observing
conditions were also good earlier this year.
T = 1965 Apr. 25.28 ET Peri. = 172.57
e = 0.90443 Node = 234.43 1950.0
a = 10.2699 Incl. = 162.71
1965 ET R. A. (1950) Decl. Delta r Variation Mag.
May 30 2 47.1 + 9 55 1.95 1.13 -12m2 -125' 12.7
June 1 2 46.3 + 9 24
3 2 45.4 + 8 53
5 2 44.5 + 8 20
7 2 43.6 + 7 47
9 2 42.6 + 7 12 1.85 1.22 -12.2 -128 13.1
11 2 41.5 + 6 37
13 2 40.4 + 6 0
15 2 39.2 + 5 21
17 2 37.9 + 4 41
19 2 36.5 + 3 59 1.71 1.31 -12.5 -135 13.4
21 2 35.1 + 3 15
23 2 33.5 + 2 29
25 2 31.8 + 1 41
27 2 29.9 + 0 50
29 2 27.9 - 0 3 1.55 1.42 -13.1 -145 13.7
July 1 2 25.7 - 1 0
3 2 23.3 - 1 59
5 2 20.7 - 3 3
7 2 17.8 - 4 10
9 2 14.7 - 5 21 1.38 1.53 -14.2 -158 14.0
Mag. = 10.5 + 5 log Delta + 15 log r
1948 EA
Dr. H. Hirose has cabled the following additional observation
by K. Tomita (see IAUC 1904):
1965 UT R.A. (1950) Decl. Mag.
Mar. 26.54444 10 44 11.12 -21 13 18.0 12.0
1965 May 21 (1907) Owen Gingerich
Read IAUC 1908
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