Central Bureau for Astronomical Telegrams
IAUC 2852: 1975k; MX0656-07
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Read IAUC 2853
Circular No. 2852
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 SUZUKI-SAIGUSA-MORI (1975k)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Oct. 7.38889 11 12 08.33 +43 34 43.5 McCrosky
7.50597 11 12 14.60 +43 34 13.6 Giclas
8.38576 11 13 01.20 +43 30 10.6 McCrosky
8.77986 11 13 23.81 +43 28 10.8 Urata
8.78854 11 13 24.26 +43 28 09.3 "
9.79977 11 14 26.74 +43 22 09.7 "
9.80590 11 14 27.03 +43 22 08.1 "
12.4080 11 17 46.5 +43 00 47 A'Hearn
12.48646 11 17 52.55 +42 59 54.2 Giclas
14.13514 11 20 35.47 +42 40 17.3 Milet
14.14241 11 20 35.63 +42 40 10.7 9 "
16.48993 11 25 34.90 +42 00 31.9 Giclas
R. E. McCrosky (Harvard College Observatory, Agassiz Station). 41-cm
Metcalf astrograph. Measurer: C. Y. Shao.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
T. Urata (Nihondaira Observatory). 15-cm f/6 reflector. From
Nihondaira Obs. Circ. No. 697.
M. F. A'Hearn (University of Maryland). MOTS-40 camera
B. Milet (Nice Observatory). The first image is weak.
The following improved orbital elements, determined by the
undersigned from 16 observations, confirm that the comet will make a
close approach to the earth in late October (cf. IAUC 2850). The
uncertainty in the ephemeris then is estimated as about 0o.3.
T = 1975 Oct. 15.396 ET Peri. = 152.062
Node = 216.065 1950.0
q = 0.83806 AU Incl. = 118.317
1975 ET R. A. (1950) Decl. Delta r Elong. m1
Oct. 23 11 52.82 +37 32.4 0.336 0.850 55.3 7.4
24 12 00.38 +36 04.9
25 12 09.62 +34 10.5 0.266 0.857 52.1 7.0
26 12 21.05 +31 37.1
27.0 12 35.42 +28 05.2 0.200 0.866 45.5 6.4
27.5 12 44.03 +25 48.1
28.0 12 53.80 +23 03.2 0.169 0.871 39.8 6.0
28.5 13 04.94 +19 43.7
29.0 13 17.68 +15 41.6 0.141 0.876 31.4 5.7
29.5 13 32.29 +10 48.3
30.0 13 49.03 + 4 56.7 0.119 0.881 19.3 5.3
30.5 14 08.20 - 1 54.8
31.0 14 30.00 - 9 37.4 0.106 0.887 5.2 5.1
31.5 14 54.52 -17 47.4
Nov. 1.0 15 21.63 -25 49.1 0.105 0.894 18.5 5.1
1.5 15 50.87 -33 06.2
2.0 16 21.44 -39 13.9 0.117 0.900 35.7 5.4
2.5 16 52.32 -44 03.9
3.0 17 22.38 -47 41.3 0.138 0.907 48.7 5.8
3.5 17 50.70 -50 17.8
4.0 18 16.63 -52 06.8 0.164 0.914 57.6 6.2
4.5 18 39.88 -53 20.7
5.0 19 00.45 -54 09.1 0.195 0.922 63.6 6.6
5.5 19 18.48 -54 39.6
6 19 34.23 -54 57.6
8 20 19.87 -55 06.2 0.294 0.946 72.7 7.6
10 20 47.81 -54 39.6
12 21 06.19 -54 08.4 0.434 0.982 76.2 8.6
14 21 19.10 -53 39.6
16 21 28.66 -53 14.4 0.575 1.021 76.5 9.4
18 21 36.07 -52 52.7
20 21 42.02 -52 33.7 0.714 1.063 75.4 10.0
22 21 46.96 -52 17.0
24 21 51.17 -52 02.2 0.851 1.108 73.7 10.6
m1 = 10.5 + 5 log Delta + 10 log r
Selected total visual magnitude estimates: Oct. 7.41 UT, 8.5
(C. S. Morris, West Lafayette, Indiana, 15-cm f/4 reflector, 24 x);
11.47, 8.3 (Morris): 12.47, 8.1 (P. Maley, Houston, Texas, 13-cm
f/5 refractor); 14.40. 7.5 (D. Green and T. Rokoske, Boone, North
Carolina, 12 x 50 binoculars; possible faint tail spike 5' long in
p.a. 310o); 15.46, 8.2 (M. J. Mayo and J. Truxton, Agoura, California,
10 x 50 binoculars); 17.46, 8.3 (Maley); 18.48, 8.0 (Maley);
19.47, 8.0 (Maley; possible 0o.7 tail, p.a. 260o); 20.48, 7.9 (Maley).
MX0656-07
G. F. Carpenter, C. J. Eyles, G. K. Skinner, A. P. Willmore
and A. M. Wilson, University of Birmingham, report the following
improved position (cf. IAUC 2843), obtained using the rotation modulation
collimator on Ariel 5: R.A. = 6h56m01s, Decl.= - 7o11'.7 (equinox
1950.0). The 90-percent confidence error radius is 3'. On Oct.
4-8 the 3-7 keV intensity had decayed to about 0.02 that of the Crab.
1975 October 21 (2852) Brian G. Marsden
Read IAUC 2853
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