Central Bureau for Astronomical Telegrams
IAUC 2591: 1973f; P/ENCKE; UV Cas; 51 NEMAUSA
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Read IAUC 2592
Circular No. 2591
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 KOHOUTEK (1973f)
Further precise positions have been reported as follows:
1973 UT R.A. (1950) Decl. m1 Observer
Oct. 23.82943 11 13 48.20 - 5 37 13.9 9 Urata
25.81146 11 18 26.13 - 6 08 41.0 8.5 "
25.83085 11 18 28.96 - 6 09 00.8 "
31.52604 11 32 45.44 - 7 45 35.3 Klemola
Nov. 2.43403 11 37 54.2 - 8 20 20 10 Harrington
T. Urata (Nihondaira Observatory). Tail 5' long in p.a. 270-275o
on Oct. 23, 15' in p.a. 270o on Oct. 25. From Nihondaira Obs.
Circ. No. 476.
A. R. Klemola (Lick Observatory). 51-cm astrograph.
R. S. Harrington (U.S. Naval Observatory, Washington). 38-cm
astrograph (stopped down to 23 cm). Poor conditions.
Dr. H. Spinrad, University of California at Berkeley, reports
that low-resolution spectra, obtained by Harding E. Smith,
J. Leibert and himself with the 305-cm reflector at Lick on Oct. 30.5
UT show fairly strong Swan bands at 5165 A and 4737 A, a
weaker one at 5635 A, and likely [O I] at 6300 A and 6363 A
(this being concentrated mainly very near the nucleus).
Dr. R. L. Waterfield, Woolston Observatory, writes that plates
taken on Oct. 25.2 and 27.2 UT show a wide, very faint, diffuse,
fan tail over p.a. 250-340o; the main streamer (1'.5 on a 10-min
exposure, 3'.0 on a 20-min exposure) is in p.a. 285o. The main coma
has a diameter of about 30-40", and there is a faint outer coma
some 90" in diameter. The total magnitude was 7.5-8.0.
Selected recent estimates of m1 are:
1973 UT m1 Observer 1973 UT m1 Observer
Oct. 20.45 9.1 Morris Oct. 27.67 9.0 Jones
25.42 8.6 Meisel 28.40 8.5 Mattei
25.67 9.0 Jones 31.52 7.5 Mayo
26.18 8.5 Gieseking Nov. 1.44 8.0 Sherrod
C. S. Morris (West Lafayette, Indiana). 32-cm f/6 reflector, 52 x.
D. Meisel (South Bristol, New York). 7.5-cm reflector, 20 x.
Comet 10' long (in sun-antisun direction), 4' wide.
A. F. Jones (Nelson, New Zealand). 32-cm reflector, 86 x.
F. Gieseking (Hoher List Observatory). 30-cm f/5 astrograph.
M. Mattei (Harvard, Massachusetts). 30-cm refractor.
M. Mayo and J. Truxton (Agoura, California). 6-cm f/5 refractor.
C. Sherrod (North Little Rock, Arkansas). 15-cm f/16 refractor.
PERIODIC COMET ENCKE
Mr. C. Y. Shao, Harvard College Observatory, provides the
following precise position, obtained with the 155-cm reflector:
1973 UT R.A. (1950) Decl. m2
Oct. 24.99653 23 14 37.32 + 5 07 41.7 20-20.5
UV CASSIOPEIAE
Mr. J. E. Isles, Director of the Variable Star Section of the
British Astronomical Association, writes that visual estimates made
at Oxford University indicate that this R CrB-type variable is
fading. Magnitudes are: Oct. 21.17, 10.9 and 27.04, 11.2
(P. W. Hornby) and 29.98, 11.5 (J. A. Bailey).
51 NEMAUSA
The following precise ephemeris has been prepared by
L. K. Kristensen and O. Moller, Ole Romer Observatory, Aarhus. It is
based on a preliminary orbit fitted to 25 normal places 1943-1963,
perturbations by Venus to Pluto having been taken into account.
The E-terms of aberration and the correction to ET have been neglected.
The ephemeris can be rigorously compared with observations
by interpolation to the observed UT. High-precision observations
at this opposition are very much desired.
1973/74 UT R. A. (1950) Decl. Delta r Mag.
Nov. 24.00 7 28 32.28 +07 13 56.8 1.606 2.338 11.3
Dec. 4.00 7 26 17.47 +06 33 12.2 1.512 2.330 11.1
14.00 7 21 00.94 +06 07 21.0 1.435 2.323 10.8
24.00 7 13 06.56 +06 00 06.8 1.380 2.315 10.6
Jan. 3.00 7 03 26.58 +06 13 43.6 1.349 2.308 10.4
13.00 6 53 18.00 +06 47 35.2 1.345 2.301 10.4
23.00 6 44 02.98 +07 38 33.2 1.367 2.294 10.6
Feb. 2.00 6 36 56.29 +08 41 28.3 1.413 2.287 10.8
12.00 6 32 47.11 +09 50 27.9 1.479 2.280 11.0
22.00 6 31 55.46 +11 00 26.5 1.562 2.273 11.2
Mar. 4.00 6 34 22.44 +12 07 12.7 1.658 2.267 11.4
14.00 6 39 52.75 +13 07 42.5 1.762 2.261 11.6
24.00 6 48 04.98 +13 59 51.5 1.872 2.255 11.8
Apr. 3.00 6 58 37.48 +14 42 06.0 1.984 2.249 11.9
13.00 7 11 06.84 +15 13 27.4 2.098 2.244 12.0
1973 November 7 (2591) Brian G. Marsden
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