Central Bureau for Astronomical Telegrams
IAUC 2773: CH UMa; P/SCHWASSMANN-WACHMANN 1; 1974g
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Read IAUC 2774
Circular No. 2773
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
CH URSAE MAJORIS
J. E. Bortle, Brooks Observatory, writes that a maximum of
this star is in progress. Recent visual magnitude estimates are:
Apr. 12.06 UT, [14.2; 14.08, [14.0; 16.4, 12.2 (this observation is
by R. Annal, Barstow, California); 20.07, 11.4; 21.07, 11.5; 22.08,
11.6; 23.07, 11.8. The period of the star is about 203.8 days;
see also Howarth (1975, J. Br. Astron. Assoc. 85, 120).
PERIODIC COMET SCHWASSMANN-WACHMANN 1
The following ephemeris, by P. Herget, is from Publ. Cincinnati
Obs. (1968) No. 23:
1975/76 ET R. A. (1950) Decl. Delta r
June 7 1 05.22 +14 28.8 6.052 5.532
17 1 10.82 +15 17.1 5.923 5.536
27 1 15.72 +16 02.2 5.785 5.539
July 7 1 19.82 +16 43.8 5.640 5.542
17 1 23.05 +17 21.1 5.491 5.546
27 1 25.28 +17 53.5 5.341 5.549
Aug. 6 1 26.45 +18 20.5 5.193 5.553
16 1 26.48 +18 41.2 5.053 5.556
26 1 25.38 +18 55.1 4.925 5.560
Sept. 5 1 23.17 +19 01.5 4.812 5.563
15 1 19.97 +19 00.1 4.718 5.567
25 1 15.93 +18 51.1 4.649 5.570
Oct. 5 1 11.33 +18 34.9 4.607 5.574
15 1 06.50 +18 12.6 4.594 5.578
25 1 01.75 +17 46.1 4.611 5.581
Nov. 4 0 57.43 +17 17.4 4.659 5.585
14 0 53.83 +16 48.8 4.734 5.589
24 0 51.18 +16 22.5 4.835 5.593
Dec. 4 0 49.65 +16 00.3 4.958 5.597
14 0 49.28 +15 43.9 5.098 5.601
24 0 50.10 +15 33.9 5.250 5.605
Jan. 3 0 52.08 +15 31.0 5.410 5.609
13 0 55.15 +15 35.1 5.574 5.613
23 0 59.18 +15 45.9 5.736 5.617
Feb. 2 1 04.10 +16 03.1 5.893 5.621
12 1 09.80 +16 26.0 6.042 5.625
22 1 16.17 +16 53.8 6.179 5.629
COMET VAN DEN BERGH (1974g)
The following improved orbital elements, by B. G. Marsden, are
from 31 observations 1974 Nov. 12 to 1975 Mar. 4. Perturbations by
all nine planets were taken into account. The osculating value of
1/a = -0.000668 +/- 0.000054 (m.e.) AU**-1, and the 'original' value is
close to zero.
Epoch = 1974 Aug. 21.0 ET
T = 1974 Aug. 8.1758 ET Peri. = 151.8041
e = 1.004022 Node = 225.4025 1950.0
q = 6.019617 AU Incl. = 60.8578
1975/76 ET R. A. (1950) Decl. Delta r m2
Mar. 15 4 13.19 +47 27.1 1.668 1.754 9.6
June 17 3 12.77 +17 47.6 7.218 6.404 19.4
27 3 19.17 +17 31.6
July 7 3 25.08 +17 12.0 7.049 6.452 19.3
17 3 30.41 +16 48.3
27 3 35.06 +16 20.1 6.821 6.503 19.3
Aug. 6 3 38.95 +15 47.0
16 3 42.00 +15 08.9 6.558 6.556 19.3
26 3 44.13 +14 25.4
Sept. 5 3 45.29 +13 36.7 6.291 6.612 19.2
15 3 45.44 +12 43.0
25 3 44.58 +11 44.5 6.056 6.669 19.2
Oct. 5 3 42.76 +10 42.2
15 3 40.07 + 9 37.2 5.893 6.729 19.1
25 3 36.66 + 8 30.8
Nov. 4 3 32.74 + 7 24.9 5.834 6.791 19.1
14 3 28.55 + 6 21.3
24 3 24.35 + 5 21.8 5.903 6.855 19.2
Dec. 4 3 20.39 + 4 28.0
14 3 16.92 + 3 41.1 6.098 6.921 19.3
24 3 14.12 + 3 01.7
Jan. 3 3 12.13 + 2 30.1 6.396 6.989 19.5
13 3 11.05 + 2 05.9
23 3 10.89 + 1 48.6 6.763 7.058 19.6
Feb. 2 3 11.66 + 1 37.1
12 3 13.31 + 1 30.6 7.156 7.129 19.8
22 3 15.78 + 1 27.9
Mar. 3 3 18.99 + 1 28.0 7.538 7.202 20.0
13 3 22.86 + 1 29.8
23 3 27.30 + 1 32.4 7.879 7.276 20.1
Apr. 2 3 32.21 + 1 34.9
12 3 37.51 + 1 36.5 8.154 7.352 20.2
m2 = 7.0 + 5 log Delta + 10 log r
1975 May 5 (2773) Brian G. Marsden
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