Central Bureau for Astronomical Telegrams
IAUC 2717: PERIODIC COMETS SWIFT (1895 II) AND SCHORR (1918 III); 1932 HA (APOLLO); P/SCHWASSMANN-WACHMANN 1; R CrB
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Circular No. 2717
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
PERIODIC COMETS SWIFT (1895 II) AND SCHORR (1918 III)
Dr. N. A. Belyaev, Institute for Theoretical Astronomy, Leningrad,
provides the following predicted elements, calculated by O. I.
Stal'bovskij and himself for P/Swift (formerly P/Swift 2) and by
V. V. Emel'yanenko, N. Yu. Goryajnova and himself for P/Schorr:
P/Swift P/Schorr
Epoch = 1974 Nov. 9.0 1975 Jan. 28.0 ET
T = 1974 Nov. 5.3155 1974 Dec. 18.3510 ET
Peri. = 187.2789 319.5034
Node = 145.8258 82.8135 1950.0
Incl. = 8.7538 6.4561
q = 1.327921 2.536241 AU
e = 0.642374 0.359375
a = 3.713156 3.959010 AU
n = 0.1377493 0.1251193
P = 7.155 7.877 years
The predicted values of T are uncertain by at least + 10 days. An
ephemeris for P/Swift appears in Handb. Br. Astron. Assoc. for 1974;
P/Schorr is not like1y to be brighter than magnitude 20.
1932 HA (APOLLO)
The following ephemeris, by B. G. Marsden, is from an orbit
derived from observations 1973 Mar. 28 to 1974 Mar. 13:
1974/75 ET R. A. (1950) Decl. Delta r Mag.
Dec. 19 13 44.59 - 7 18.1 2.096 1.808 20.5
29 14 05.54 - 9 20.7
Jan. 8 14 27.85 -11 24.3 1.774 1.682 20.1
18 14 51.92 -13 29.0
28 15 18.38 -15 34.8 1.450 1.540 19.6
Feb. 7 15 48.13 -17 41.0
17 16 22.41 -19 45.2 1.146 1.380 19.0
27 17 02.97 -21 40.7
Mar. 9 17 51.97 -23 12.3 0.890 1.204 18.4
19 18 51.19 -23 50.2
29 20 00.23 -22 50.4 0.735 1.015 17.9
Apr. 8 21 14.46 -19 38.7
18 22 26.38 -14 28.6 0.745 0.828 17.8
28 23 30.95 - 8 16.0
May 8 0 27.81 - 1 53.3 0.928 0.683 17.8
18 1 19.15 + 4 10.9
28 2 07.09 + 9 41.1 1.206 0.655 17.8
Mag. = 17.0 + 5 log Delta + 5 log r + 0.023 (phase angle)
PERIODIC COMET SCHWASSMANN-WACHMANN 1
The following precise positions have been reported:
1974 UT R. A. (1950) Decl. m1 Observer
Oct. 5.44097 23 07 19.29 + 1 17 49.4 13 Seki
8.45909 23 06 11.48 + 1 11 22.9 14 "
11.78917 23 05 01.24 + 1 04 39.0 Mrkos
13.59757 23 04 26.13 + 1 00 58.2 15 Seki
14.60851 23 04 06.71 + 0 59 03.6 14.5 Furuta
17.76977 23 03 09.87 + 0 53 09.4 Mrkos
T. Seki (Kochi Observatory, Geisei Station). From Orient. Astron.
Assoc. Comet Bull. No. 93.
A. Mrkos (Klet Observatory).
T. Furuta (Tokai). From Orient. Astron. Assoc. Comet Bull. No. 93.
R CORONAE BOREALIS
E. F. Tedesco and D. W. Dawson, Department of Astronomy, New
Mexico State University, provide the following photoelectric
observations, obtained with the 41-cm Tortugas reflector (and 1P21
photomultiplier) and 61-cm Blue Mesa reflector (EMI 9502):
1974 UT V B - V U - B Wt. Location
June 19.208 6.78 +/- 0.02 +0.77 +/- 0.02 +0.32 +/- 0.03 1 Blue Mesa
20.253 6.71 +/- 0.03 +0.76 +/- 0.03 +0.34 +/- 0.03 1 "
21.255 6.69 +/- 0.02 +0.76 +/- 0.02 +0.34 +/- 0.03 1 "
July 17.175 6.28 +/- 0.05 2.5 Tortugas
22.3 6.20 +/- 0.03 +0.78 +/- 0.02 1 "
Oct. 2.139 6.03 +/- 0.02 +0.65 +/- 0.02 +0.23 +/- 0.08 1.5 Blue Mesa
3.079 6.03 +/- 0.01 +0.61 +/- 0.02 +0.16 +/- 0.02 1 "
5.084 5.98 +/- 0.03 +0.64 +/- 0.02 +0.22 +/- 0.02 1 "
They also determined photoelectric magnitudes for four comparison
stars (shown as '72', '76', '79' and '83', respectively, on the
AAVSO chart), namely: SAO 084005, V = 7.44 +/- 0.02, B - V = +0.47 +/-
0.03, U - B = -0.01 +/- 0.03 (five nights); SAO 084053, V = 7.81 +/-
0.05, B - V = +1.20 +/- 0.02 (four nights); SAO 083985, V = 8.05 +/-
0.03, B - V = +0.60 +/- 0.02 (one night); and SAO 084057, V = 8.32 +/-
0.03, B - V = +1.08 +/- 0.02 (one night).
1974 November 14 (2717) Brian G. Marsden
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