Central Bureau for Astronomical Telegrams
IAUC 2593: NRAO 5; LR Sgr; 1973f; 1973e; Corrs
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Read IAUC 2594
Circular No. 2593
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
NRAO 5
Dr. D. Ya. Martynov, Director of the Sternberg Astronomical
Institute, Moscow, reports that N. E. Kurochkin has observed optical
variations of the radio source NRAO 5 (R.A. = 0h03m39s, Decl. =
-6o40'.8, equinox 1950.0; Pauliny-Toth, Wade and Heeschen, 1966,
Astrophys. J. Suppl. 13, 65). Eighty plates taken at the Sternberg
Institute between 1960 and 1973 suggest that the object is probably
of BL Lac type, with a photographic magnitude range of 16.1 to 18.3.
Maxima occurred on 1971 Apr. 17 and June 27, minima on 1971 May 1
and 1973 Aug. 15.
LR SAGITTARII
M. S. Bessell, Mount Stromlo and Siding Spring Observatories,
reports that a photoelectric scan at 30-A resolution on Nov. 2
indicates that the object near V1017 Sgr (IAUC 2588, 2590) is an
M3-M4 star without H-alpha emission; this supports the suggestion that
it is identical with LR Sgr.
COMET KOHOUTEK (1973f)
B. Milet, Nice Observatory, provides the following precise
positions, obtained with the 40-cm f/5 astrograph:
1973 UT R.A. (1950) Decl. m1
Oct. 26.16477 11 19 16.76 - 6 14 23.8 7.8
26.17550 11 19 18.22 - 6 14 33.8
27.16480 11 21 41.71 - 6 30 46.0
27.17727 11 21 43.24 - 6 30 58.3
29.16281 11 26 39.02 - 7 04 21.3
29.17458 11 26 40.80 - 7 04 33.6
31.16981 11 31 49.19 - 7 39 18.1
31.18159 11 31 50.96 - 7 39 29.7
The following daily ephemeris, for the interval around
perihelion passage, is from the orbital elements on IAUC 2588, with
magnitudes given by the formula on IAUC 2580:
1973/74 R. A. (1950) Decl. Delta r m1
Dec. 19 16 18.41 -26 03.5
20 16 30.82 -26 02.5 1.137 0.366 -0.1
21 16 43.65 -25 57.0
22 16 56.93 -25 46.5 1.136 0.302 -0.9
23 17 10.71 -25 30.6
24 17 25.06 -25 08.5 1.139 0.238 -2.0
25 17 40.06 -24 39.7
26 17 55.81 -24 03.1 1.140 0.179 -3.2
27 18 12.32 -23 18.8
28 18 29.35 -22 27.5 1.125 0.144 -4.2
29 18 46.23 -21 32.7
30 19 02.23 -20 38.5 1.080 0.159 -3.8
31 19 17.05 -19 47.0
Jan. 1 19 30.86 -18 58.1 1.020 0.211 -2.7
2 19 43.93 -18 10.9
3 19 56.51 -17 24.3 0.964 0.274 -1.7
4 20 08.76 -16 37.6
5 20 20.82 -15 50.2 0.916 0.339 -0.9
6 20 32.75 -15 01.7
7 20 44.61 -14 11.9 0.877 0.401 -0.3
8 20 56.42 -13 20.6
The comet will have its minimum elongation from the sun (33'.4 in
p.a. 344o) on Dec. 27d14h57m UT. The comet's actual offsets from
the sun around this time are as follows:
Dec. UT R. A. Decl. Dec. UT R. A. Decl. Dec. UT R. A. Decl.
26.25 -17m60 -30'1 27.25 - 5m36 +14'0 28.25 + 7m27 +64'0
26.50 -14.61 -19.7 27.50 - 2.21 +26.1 28.50 +10.41 +77.0
26.75 -11.57 - 8.9 27.75 + 0.95 +38.5 28.75 +13.51 +90.0
27.00 - 8.48 + 2.4 28.00 + 4.11 +51.2 29.00 +16.56 +103.1
COMET KOHOUTEK (1973e)
Dr. L. Kohoutek, Hamburg Observatory, Bergedorf, provides the
following precise positions:
1973 UT R.A. (1950) Decl. m1
Aug. 1.04074 4 34 37.20 +64 31 43.8 15
Sept.22.91441 22 44 57.22 +50 40 12.7 17
22.93872 22 44 51.10 +50 38 35.9
CORRIGENDA
IAUC 2568: Periodic Comet Brooks 2 (1973j). The time of observation
should read July 7.29704 UT.
IAUC 2592: Periodic Comet Gehrels 2 (1973n). The time of the last
observations should read Nov. 3.21670 UT.
1973 November 8 (2593) Brian G. Marsden
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