Central Bureau for Astronomical Telegrams
IAUC 3007: P/SCHWASSMANN-WACHMANN 1; P/TEMPEL 2; (944); 1975 YA
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Read IAUC 3008
Circular No. 3007
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 Telex: 921428
Telephone: (617) 864-5758
PERIODIC COMET SCHWASSMANN-WACHMANN 1
A. Mrkos, Klet Observatory, provides the following precise
positions. On Oct. 22.9 UT the total magnitude m1 was 17.5.
1976 UT R. A. (1950) Decl. m1
Oct. 25.87282 3 15 16.08 +29 27 58.4 10.8
25.88845 3 15 15.62 +29 27 57.8
26.85095 3 14 47.49 +29 26 57.0 11.0
26.86970 3 14 47.22 +29 26 56.2
27.90790 3 14 16.26 +29 25 42.6 11.4
27.92527 3 14 15.77 +29 25 41.6
An observation at Harvard Observatory's Agassiz Station on Oct.
24.1 UT shows the comet near normal brightness. Observations by
several observers in Japan at the end of October confirm the outburst.
J. Bortle, Brooks Observatory, provides recent total visual
magnitudes (32-cm reflector): Nov. 13.11 UT, 12.1; 17.07, 12.0.
PERIODIC COMET TEMPEL 2
The following ephemeris is from the predicted elements in
Handb. Br. Astron. Assoc. for 1977:
1976/77 ET R. A. (1950) Decl. Delta r m2
Dec. 8 12 32.94 + 6 27.5 3.836 3.635 21.2
18 12 40.70 + 6 11.1
28 12 47.53 + 6 04.8 3.453 3.Z49 20.9
Jan. 7 12 53.24 + 6 10.2
17 12 57.61 + 6 28.5 3.067 3.460 20.6
27 13 00.40 + 7 00.8
Feb. 6 13 01.36 + 7 47.5 2.707 3.366 20.2
16 13 00.31 + 8 48.3
26 12 57.11 +10 01.1 2.409 3.269 19.8
Mar. 8 12 51.82 +11 22.4
18 12 44.68 +12 46.7 2.206 3.168 19.4
28 12 36.20 +14 06.8
Apr. 7 12 27.11 +15 15.6 2.118 3.062 19.3
17 12 18.28 +16 07.2
27 12 10.53 +16 37.6 2.139 2.953 19.4
May 7 12 04.54 +16 45.8
17 12 00.73 +16 32.9 2.238 2.841 19.6
27 11 59.29 +16 00.9
June 6 12 00.23 +15 12.5 2.377 2.724 19.7
16 12 03.42 +14 10.1
26 12 08.69 +12 55.9 2.524 2.604 19.8
July 6 12 15.85 +11 31.7
16 12 24.71 + 9 58.9 2.654 2.481 19.8
26 12 35.13 + 8 18.4
Aug. 5 12 46.96 + 6 31.5 2.752 2.355 19.7
15 13 00.12 + 4 38.8
25 13 14.56 + 2 41.2 2.812 2.226 19.6
Sept. 4 13 30.23 + 0 39.5
14 13 47.13 - 1 25.5 2.830 2.097 19.4
m2 = 15.0 + 5 log Delta + 5 log r + 0.03 (phase angle)
(944) HIDALGO
E. F. Tedesco and J. D. Drummond, Department of Astronomy, New
Mexico State University, report that preliminary results from
observations on Oct. 24 and 25 indicate that this object has a rotation
period of 10h.0 +/- 0h.1 and an amplitude of 0.35 magnitude (from B
14.1 to 14.4). Photoelectric observations on Oct. 25d06h35m UT
gave V = 13.45 +/- 0.03, B-V = +0.73 +/- 0.04, U-B = +0.34 +/- 0.06.
D. R. Soderblom, Lick Observatory, writes that he and E. A.
Harlan obtained untrailed spectrograms (dispersion 120 A/mm) on Oct.
14 and 15 with the coude spectrograph of the 305-cm reflector. The
longest exposure was 3 hours on Kodak 103a-0 emulsion. At that
time, Hidalgo was less than 2.4 AU from the sun and should have
revealed the CN 0-0 3883 A bandhead if this unusual object were of
cometary origin, since comets usually show this feature when less
than 3 AU from the sun. However, only a heavily over-exposed solar
spectrum was visible on these spectrograms as well as on a 150-A/mm
image-tube scan obtained by J. S. Miller and S. A. Hawley on Oct. 21.
1975 YA
Further precise positions have been reported as follows:
1976 UT R. A. (1950) Decl. mpg Observer
June 4.25692 20 29 02.85 + 7 14 45.9 McCrosky
6.32675 20 22 38.97 + 4 25 21.4 Blanco
6.34723 20 22 34.79 + 4 23 35.2 "
July 2.46939 17 45 32.66 -43 23 47.8 16.8 Gilmore
2.51632 17 45 10.54 -43 27 14.2 "
3.57686 17 36 53.75 -44 42 58.3 "
3.62295 17 36 31.79 -44 46 05.9 "
R. E. McCrosky (Harvard College Observatory). Measurer: C. Y. Shao.
V. M. and B. M. Blanco (Cerro Tololo Interamerican Observatory).
A. C. Gilmore (Carter Observatory). Measurer: P. M. Kilmartin.
1976 November 18 (3007) Brian G. Marsden
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