Central Bureau for Astronomical Telegrams
IAUC 2810: 1975h; omicron And
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Read IAUC 2811
Circular No. 2810
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 KOBAYASHI-BERGER-MILON (1975h)
Dr. Ch. Fehrenbach, Haute Provence Observatory, reports the
following spectroscopic observations, obtained by Y. Andrillat, F.
Dossin, A. Woszczyk and himself with the 193-cm (range 8000-10 000 A,
dispersion 230 A/mm) and 152-cm (range 3700-5000 A, dispersions
80, 20 and 6 A/mm) reflectors: CN 3883 A is intense; CN 4216 A
and 9138-9148-9175 A are evident (the only bands in the infrared);
CH is normal; C3 4050 A is intense and well developed; C2 Swan bands
are rather weak; and the continuous spectrum near the nucleus is of
moderate intensity.
E. Devinney and C. McCracken, Goddard Space Flight Center,
report that observations on July 31.2 UT show a weak continuum and
emissions of CN (3883 A, 4216 A), CH (4320 A), NH (3360 A) and a hint
of OH (3060-3090 A). The emission previously attributed to CO+
(IAUC 2809) in fact refers to CH.
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
July 8.01354 21 29 47.60 + 0 28 32.6 7.5 Mrkos
8.01562 21 29 47.04 + 0 28 51.0 "
9.01675 21 25 27.42 + 2 27 51.5 7.3 "
9.01814 21 25 26.88 + 2 28 00.0 "
10.95312 21 15 27.37 + 6 54 57.8 7.0 "
11.01250 21 15 06.04 + 7 04 07.7 "
11.95206 21 09 16.41 + 9 34 37.4 6.7 "
11.95484 21 09 15.19 + 9 35 08.1 "
12.93674 21 02 20.86 +12 28 08.7 6.5 "
12.93882 21 02 19.88 +12 28 33.6 "
13.92178 20 54 26.63 +15 38 59.1 6.5 "
14.00719 20 53 41.77 +15 56 25.8 "
14.92347 20 45 12.87 +19 11 20.2 6.2 "
15.01096 20 44 20.10 +19 30 46.6 "
16.89735 20 22 37.44 +27 00 54.4 6.2 "
16.89874 20 22 36.41 +27 01 15.5 "
17.86120 20 08 55.62 +31 10 09.7 6.0 "
17.86259 20 08 54.46 +31 10 28.8 "
18.90104 19 51 39.89 +35 47 11.1 5.8 "
18.90247 19 51 38.42 +35 47 32.4 "
18.96046 19 50 35.35 +36 03 06.1 8.5 Debehogne
18.97916 19 50 14.80 +36 08 05.6 "
20.95833 19 08 21.65 +44 43 54.0 5.5 Waterfield
21.93080 18 43 03.71 +48 32 25.8 8.5 Debehogne
21.95366 18 42 25.55 +48 37 30.9 "
22.80781 18 17 31.49 +51 34 31.4 Hers
22.81215 18 17 23.57 +51 35 21.1 "
22.95508 18 12 58.28 +52 01 37.7 8.0 Debehogne
23.02225 18 10 51.70 +52 14 02.3 "
24.50069 17 22 12.34 +55 58 54.7 4 Tomita
24.50208 17 22 09.10 +55 59 07.8 "
25.06239 17 02 45.56 +56 58 59.4 8.0 "
27.07431 15 54 22.08 +58 48 32.2 Harrington
27.07847 15 54 14.00 +58 48 36.8 "
30.47986 14 22 00.28 +57 32 00.5 5 Tomita
30.48229 14 21 56.83 +57 31 54.0 "
A. Mrkos (Klet Observatory).
H. Debehogne and G. Roland (Royal observatory, Uccle).
R. L. Waterfield (Woolston Observatory). Very diffuse outer coma
5' in diameter, moderately concentrated inner coma 1'.
J. Hers (Randburg, near Johannesburg). 20-cm reflector.
R. S. Harrington (U.S. Naval Observatory, Washington). 38-cm
astrograph stopped to 22-cm.
K. Tomita (Tokyo Astronomical Observatory).
Further selected total visual magnitude estimates and coma
diameters: July 22.5 UT, 4.9, 17' (J. E. Bortle, observing from
Japan, 10 x 50 binoculars); 23.95, 5.1, 22': (D. A. Pickup, Penicuik,
Scotland, 11 x 80 binoculars); 25.03, 5.0, 20': (Pickup);
26.16, 4.9, - (P. Maley, Houston, Texas, 7 x 35 binoculars); 27.5,
4.8, 17' (Bortle); 27.96, 4.9, 8' (N. A. v.d. Mey, Soesterberg, The
Netherlands, 7 x 50 binoculars); 29.15, 4.9, - (Maley); 30.14, 5.2,
20' (C. Sherrod, North Little Rock, Arkansas, 7 x 50 binoculars and
15-cm refractor); 31.23, 4.3, 15' (M. J. Mayo, Agoura, California,
7 x 35 binoculars); Aug. 2.16, 4.5, 27' (Sherrod); 3.13, 4.5, 22'
(Sherrod); 4.19, 4.4, 10' (Mayo and J. Truxton). A 10-min exposure
by G. Emerson at Mount Evans Observatory on July 27.25 UT shows a
tail 8o.25 long in p.a. 121o (7.5-cm f/4 camera, 103a-F emulsion).
omicron ANDROMEDAE
B. W. Bopp, Ritter Observatory, writes that observations were
made of the H-alpha region (dispersion 39 A/mm) of omicron And (cf. IAUC 2802)
on July 26.3 UT with the 100-cm reflector. H-alpha was visible as a
deep absorption feature, flanked by emission components. The
separation between the emission components was ~ 350 km/s, and the
red emission appeared to be slightly stronger than the blue.
1975 August 5 (2810) Brian G. Marsden
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