Central Bureau for Astronomical Telegrams
IAUC 2962: 1975o; P/SCHWASSMANN-WACHMANN 1
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Read IAUC 2963
Circular No. 2962
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 COMET GEHRELS 3 (1975o)
The following precise positions have been reported:
1975/76 UT R. A. (1950) Decl. Observer
Dec. 7.20903 1 32 19.15 +10 17 21.2 Roemer
7.23264 1 32 18.87 +10 17 19.3 "
29.04925 1 32 18.75 +10 10 24.4 Shao
Jan. 27.18733 1 44 29.24 +11 11 49.0 Roemer
Feb. 25.01155 2 07 18.98 +13 09 26.4 Schwartz
26.02105 2 08 15.82 +13 14 14.7 "
E. Roemer (University of Arizona). Dec. 7: Lunar and Planetary Lab.
154-cm reflector. Jan. 27: Steward Obs. 229-cm reflector; D.
Daniels assisted. Measurers: W. Smith and C. D. Vesely.
C. Y. Shao and G. Schwartz (Harvard Obs.). Measurer: J. H. Bulger.
The following improved elements, by B. G. Marsden, are from 14
observations 1975 Oct. 27 to 1976 Feb. 26, perturbations included:
T = 1977 Apr. 23.0257 ET Epoch = 1977 Apr. 7.0 ET
Peri. = 231.4712 e = 0.152339
Node = 242.5584 1950.0 a = 4.038677 AU
Incl. = 1.1010 n = 0.1214354
q = 3.423429 AU P = 8.116 years
1976/77 ET R. A. (1950) Decl. Delta r m2
July 21 5 13.88 +22 55.0 4.298 3.561 19.7
31 5 26.84 +23 05.6
Aug. 10 5 39.31 +23 11.9 4.078 3.543 19.5
20 5 51.17 +23 14.3
30 6 02.28 +23 13.1 3.816 3.526 19.4
Sept. 9 6 12.45 +23 09.2
19 6 21.54 +23 03.1 3.526 3.510 19.2
29 6 29.32 +22 55.8
Oct. 9 6 35.60 +22 48.1 3.225 3.495 19.0
19 6 40.18 +22 40.9
29 6 42.83 +22 35.0 2.937 3.481 18.8
Nov. 8 6 43.42 +22 30.9
18 6 41.86 +22 29.0 2.692 3.469 18.6
28 6 38.20 +22 28.9
Dec. 8 6 32.72 +22 30.2 2.525 3.458 18.4
18 6 25.88 +22 32.1
28 6 18.33 +22 33.6 2.466 3.449 18.3
Jan. 7 6 10.89 +22 34.3
17 6 04.32 +22 34.4 2.526 3.441 18.4
27 5 59.25 +22 34.0
Feb. 6 5 56.15 +22 33.8 2.692 3.434 18.5
16 5 55.20 +22 34.0
26 5 56.45 +22 34.7 2.929 3.429 18.7
Mar. 8 5 59.80 +22 35.6
18 6 05.06 +22 36.1 3.205 3.426 18.9
28 6 12.03 +22 35.5
Apr. 7 6 20.48 +22 32.9 3.488 3.424 19.1
17 6 30.20 +22 27.7
27 6 40.98 +22 19.0 3.757 3.424 19.2
May 7 6 52.64 +22 06.4
17 7 05.01 +21 49.3 3.995 3.425 19.4
27 7 17.95 +21 27.4
June 6 7 31.32 +21 00.4 4.190 3.427 19.5
PERIODIC COMET SCHWASSMANN-WACHMANN 1
The following ephemeris, by P. Herget, is from Publ. Cincinnati
Obs. (1968) No. 23:
1976/77 ET R. A. (1950) Decl. Delta r
July 11 3 05.63 +26 18.0 6.169 5.688
21 3 11.57 +26 52.9 6.038 5.692
31 3 16.70 +27 25.5 5.897 5.697
Aug. 10 3 20.95 +27 55.6 5.751 5.701
20 3 24.20 +28 22.7 5.601 5.706
30 3 26.30 +28 46.5 5.451 5.710
Sept. 9 3 27.20 +29 06.4 5.306 5.714
19 3 26.83 +29 21.7 5.170 5.719
29 3 25.18 +29 31.8 5.047 5.723
Oct. 9 3 22.35 +29 35.9 4.942 5.728
19 3 18.45 +29 33.5 4.858 5.732
29 3 13.73 +29 24.4 4.801 5.737
Nov. 8 3 08.53 +29 08.9 4.772 5.741
18 3 03.23 +28 47.8 4.774 5.746
28 2 58.20 +28 22.5 4.807 5.750
Dec. 8 2 53.78 +27 55.0 4.869 5.755
18 2 50.30 +27 27.3 4.959 5.759
28 2 47.93 +27 01.4 5.072 5.763
Jan. 7 2 46.82 +26 38.8 5.205 5.768
17 2 47.00 +26 20.7 5.353 5.772
27 2 48.45 +26 07.8 5.511 5.777
Feb. 6 2 51.08 +26 00.3 5.674 5.781
16 2 54.85 +25 58.2 5.838 5.786
26 2 59.60 +26 01.1 5.998 5.791
Mar. 8 3 05.25 +26 08.4 6.152 5.795
18 3 11.67 +26 19.5 6.295 5.800
1976 June 14 (2962) Brian G. Marsden
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