Central Bureau for Astronomical Telegrams
IAUC 2452: 1972 RB; DRACONID METEORS 1972; SN IN NGC 3147; 1972h; 50th ANNIVERSARY ISSUE
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Circular No. 2452
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
1972 RB
The following additional observations have been reported:
1972 UT R. A. (1950) Decl. mpg Observer
Oct. 5.26961 0 30 53.97 - 4 38 15.2 Shao
8.28542 0 36.78 - 4 54.9 ~17.5 Roemer
8.30312 0 36.80 - 4 54.9 "
C. Y. Shao (Harvard College Observatory). See IAUC 2450.
E. Roemer (Lunar and Planetary Laboratory, Catalina Station). 154-cm
reflector.
The following improved orbital elements, by the undersigned,
are from observations Sept. 16 to Oct. 8:
T = 1972 Aug. 23.731 ET
Peri. = 151.979 e = 0.49199
Node = 177.024 1950.0 a = 2.16772 AU
Incl. = 5.243 n = 0.308817
q = 1.10123 AU P = 3.19 years
1972 ET R. A. (1950) Decl. Delta r Mag.
Oct. 30 1 04.91 - 4 35.1 0.363 1.330 18.8
Nov. 4 1 09.81 - 4 06.1
9 1 14.61 - 3 30.9 0.447 1.389 19.5
14 1 19.46 - 2 50.6
19 1 24.42 - 2 06.2 0.544 1.452 20.1
24 1 29.55 - 1 18.7
29 1 34.87 - 0 28.8 0.653 1.516 20.6
Dec. 4 1 40.41 + 0 22.9
9 1 46.18 + 1 15.9 0.773 1.582 21.1
14 1 52.19 + 2 09.8
19 1 58.44 + 3 04.1 0.906 1.648 21.6
Mag. = 20.0 + 5 log Delta + 5 log r + 0.023 (phase angle)
DRACONID METEORS 1972
P. D. Maley and I. Saulietis, Manned Spacecraft Center
Astronomical Society, Houston, report that 25 meteors were detected
during a 30-min interval centered on Oct. 8d05h00m UT using an image
intensifier with a 75-mm f/1 objective lens and a 30o field. Three
of the meteors were sporadic, while the other 22 came from an apparent
radiant between phi and zeta Dra. The system is known to be able to
record meteors of magnitude 7 and probably fainter. Visually, only
5 or 6 Draconids were seen during the preceding 3 or 4 hours.
SUPERNOVA IN NGC 3147
R. Wood and B. Patchett, Royal Greenwich Observatory, write
that R. Wallis and D. Thomas have taken three further direct photographs
(cf. IAUC 2434), one with the 33-cm astrograph and two with
the 66-cm refractor. The supernova and ten reference stars were
measured by Mrs. R. Selmes with a Sartorius iris photometer. The
natural system of the telescopes (using IIa-O emulsion) is known to
reproduce B magnitudes very closely, and a mean relationship between
magnitude and photometer reading has been deduced from the
quasar monitoring program; departure from the mean may introduce a
scale error of up to +/- 0.2 magnitude. The five resulting magnitudes
(also perhaps affected by a similar zero-point error) are:
1972 UT B 1972 UT B
Aug. 9.11 15.7 Aug. 18.06 16.8
10.08 15.8 31.88 17.5
15.97 16.6
COMET SANDAGE (1972h)
The following precise positions have been reported:
1972 UT R. A. (1950) Decl. Observer
July 11.17222 15 11 49.54 +24 05 53.0 Giclas
11.20694 15 11 48.90 +24 05 57.5 "
28.16493 15 09 35.88 +24 28 54.8 "
Sept. 6.86072 15 21 48.61 +24 06 20.2 Waterfield
8.13125 15 22 32.96 +24 05 06.5 Giclas
8.14306 15 22 33.35 +24 05 06.1 "
Oct. 2.11181 15 39 42.98 +23 50 51.1 "
H. L. Giclas (Lowell Observatory). 33-cm photographic telescope.
R. L. Waterfield (Woolston Observatory). Hazy sky.
FIFTIETH ANNIVERSARY ISSUE
The first of these Circulars was published just 50 years ago.
UAIC 1, issued from the Copenhagen Observatory by Elis Stromgren on
1922 Oct. 22, reported the discovery at Bergedorf of comet Baade
(1922 II) and an observation of the comet at Copenhagen.
1972 October 20 (2452) Brian G. Marsden
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