Central Bureau for Astronomical Telegrams
IAUC 3118: 4U 1145-61; IC 4997; NEBULA NEAR CL4; 1977m; P/ENCKE
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Read IAUC 3119
Circular No. 3118
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
4U 1145-61
N. E. White, Mullard Space Sciences Laboratory, reports that
Ariel 5 observations centered on 4U 1145-61 during Sept. 20-Oct. 4
have revealed x-ray pulsations with a period of 4.954 +/- 0.004 min.
Variations in this period indicate orbital motion with a period of
14-18 days. The optical candidate HD 102567 has been proposed.
IC 4997
W. A. Feibelman, Goddard Space Flight Center, reports that
microdensitometer tracings of spectrograms of the variable planetary
nebula IC 4997 show that the intensity of [O III] 4363 A is now at
least as high as that of H-gamma. This represents a significant change
in the behavior of the intensity ratio, which had been monotonically
decreasing between 1895 and 1969 (when it was considerably less
than unity). The spectrograms were obtained on Aug. 19.05 and
26.06 UT by C. W. McCracken, L. W. Brown and R. W. Hobbs using the
Goddard 91-cm telescope equipped with the Cassegrain spectrograph
(dispersions 41 and 82 A/mm) and image intensifier.
NEBULA NEAR CL4
F. Vrba, U.S. Naval Observatory, informs us that further
observations show this (cf. IAUC 3116) to be a spurious image caused by
internal reflection within the camera from a nearby bright star.
COMET KOHLER (1977m)
The following precise positions have been reported:
1977 UT R. A. (1950) Decl. m1 Observer
Sept. 9.45451 15 32 29.48 +27 56 37.4 Tsuchiya
9.47569 15 32 31.96 +27 56 15.1 "
12.47153 15 38 26.58 +26 56 45.4 9.5 Iwahana
12.47500 15 38 27.29 +26 56 39.0 "
13.43408 15 40 25.59 +26 37 03.3 Kojima
13.4365 15 40 26.1 +26 36 58 12 Furuta
13.4490 15 40 27.5 +26 36 38 "
13.46875 15 40 30.02 +26 36 19.7 Kojima
13.53125 15 40 37.94 +26 34 59.7 Seki
13.54167 15 40 39.07 +26 34 44.8 "
14.42639 15 42 31.03 +26 16 20.1 Kojima
14.44236 15 42 33.04 +26 15 59.4 "
14.8472 15 43 25.04 +26 07 28.4 Manning
14.8559 15 43 26.15 +26 07 17.0 "
15.43750 15 44 41.70 +25 54 51.9 Kojima
18.47917 15 51 30.39 +24 48 14.8 Seki
19.45486 15 53 47.26 +24 26 05.5 "
19.46597 15 53 48.68 +24 25 50.2 "
20.44132 15 56 08.00 +24 03 21.3 9.5 Urata
30.39965 16 22 28.36 +19 48 12.9 9.1 Herald
Oct. 1.38889 16 25 22.29 +19 20 00.9 9.0 "
1.39549 16 25 23.42 +19 19 48.1 "
K. Tsuchiya (JCPM Asahikawa). From Yamamoto Circ. No. 1862.
T. Iwahana (Kawane1 Kyoto). Long. = 9h02m.3, 10**7 Dxy = -394,
10**7 DZ = -244. From Japan Astron. Circ. No. 117.
N. Kojima (Ishiki) and T. Seki (Geisei). Integral seconds of R.A.
corrected on Sept. 13.54167 and 15.43750. Measurer: Seki.
T. Furuta (Kagiya, Aichi). Long. = -136o54'51", Lat. = +34o59'15", h =
50 m. From Orient. Astron. Assoc. Comet Bull. No. 152.
B. Manning (Stakenbridge, near Kidderminster, England). Measurer:
P. Birtwhistle. Communicated by G. M. Hurst.
T. Urata (JCPM Yakiimo Station). 31-cm f/5.6 reflector. From
Nihondaira Obs. Circ. No. 891.
D. Herald (Kambah, near Canberra). Sept. 30 image poor.
C. W. McCracken, Goddard Space Flight Center, reports that a
spectrogram of comet 1977m was obtained on Oct. 5.05 UT by L. W.
Brown, R. W. Hobbs and himself using the 91-cm reflector equipped
with the Cassegrain spectrograph and an image intensifier. The exposure
time was 1 hour, the dispersion 215 A/mm and the spectral
range covered 3000-7500 A. Emission from NH, CN, C2, [O I] and
(probably) C3 was detected. No emission was detected from OH, CH,
NH2 or CO . The comet was diffuse with a slight central condensation.
The continuum was very weak, implying low dust-gas ratio.
Selected total visual magnitude estimates: Sept. 28.01 UT, 8.1
(C. S. Morris, Woburn, Massachusetts, 20 x 80 binoculars; coma diameter
~ 11'); 30.00, 7.9 (J. Bortle, Brooks Observatory, 10 x 50 binoculars;
32-cm reflector showed 25' narrow tail in p.a. 60o); Oct.
2.08, 8.4 (P. Maley, Houston, Texas, 13-cm refractor); 5.02, 7.8
(Bortle, 10 x 50 binoculars; 32-cm reflector showed 6' tail in p.a.
65o); 8.03, 7.3 (S. O'Meara, Harvard Observatory, 8-cm finder; 23-cm
refractor showed tails 25' in p.a. 50o, 10' in 0o, 5' in 295o);
10.05, 7.5 (C. Sherrod, North Little Rock, Arkansas, 15-cm refractor);
11.02, 7.5 (Morris; 30' tail); 12.01, 7.4 (Morris).
PERIODIC COMET ENCKE
A. C. Gilmore, Royal Astronomical Society of New Zealand,
communicates the following total magnitude estimates by B. Nikolau,
Palmerston North (20-cm reflector): Sept. 5.30, 8.8; 7.30, 9.5.
1977 October 13 (3118) Brian G. Marsden
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