Central Bureau for Astronomical Telegrams
IAUC 1250: 1949h; 1925 II; 1949g
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Circulaire No. 1250
BUREAU CENTRAL DES TELEGRAMMES ASTRONOMIQUES.
UNION ASTRONOMIQUE INTERNATIONALE.
Adresse postale: Bureau Central des telegrammes astronomiques,
Observatory, Ostervold 3, Copenhagen K, Denmark.
Address telegraphique: Observatory Copenhagen.
PERIODIC COMET VAISALA 1 (1939 IV; 1949h)
The following ephemeris, computed by Miss L. Oterma,
Turku, from elements provided by herself, is a continuation
of that given in Circular 1228 and is from the "B.A.A.
Handbook 1950" with a correction applied corresponding to
Delta-T = +0.9 days (see Circular 1249):
0h U.T.
1950 R.A. (1950.0) Decl. Delta r Mag.
Jan. 29 16 27.3 -11 44
Feb. 8 16 48.2 -11 57 2.146 1.974 16.8
18 17 7.2 -11 57
28 24.3 -11 47 2.042 2.072 16.9
Mar. 10 39.2 -11 28
20 17 51.7 -11 2 1.928 2.180 17.0
30 18 1.6 -10 33
Apr. 9 8.6 -10 1 1.813 2.296 17.1
19 12.6 - 9 33
29 13.6 - 9 9 1.715 2.417 17.2
May 9 11.5 - 8 53
19 18 6.7 - 8 48 1.661 2.542 17.4
29 17 59.8 - 8 54
June 8 51.4 - 9 12 1.687 2.670 17.6
18 42.7 - 9 41
28 34.6 -10 19 1.812 2.799 18.0
July 8 27.8 -11 4
18 17 23.1 -11 55 2.039 2.928 18.4
PERIODIC COMET SCHWASSMANN-WACHMANN 1 (1925 II)
The following ephemeris, computed by Paul Herget from
elements provided by himself, is a continuation of that given
in Circular 1228 and is from the "B.A.A. Handbook 1950".
0h U.T.
1950 R.A. (1950.0) Decl. Delta r
Jan. 29 10 21.3 + 8 27
Feb. 8 17.6 + 8 42 6.223 7.182
18 13.5 + 8 59
28 9.4 + 9 16 6.195 7.177
Mar. 10 5.5 + 9 33
20 10 1.9 + 9 48 6.291 7.172
30 9 58.9 +10 1
Apr. 9 56.7 +10 10 6.493 7.167
19 55.3 +10 15
29 54.8 +10 16 6.768 7.162
May 9 55.2 +10 12
19 56.5 +10 3 7.079 7.156
29 9 58.5 + 9 51
June 8 10 1.3 + 9 34 7.391 7.150
Opposition 1950 Feb. 24
PERIODIC COMET WILSON-HARRINGTON (1949g)
Dr. Leland E. Cunningham, Students' Observatory, University
of California, Berkeley, writes: "The provisional positions
below were measured on negatives of contacts from
three photographs taken with the 48" Schmidt. These were
very kindly provided by the Mount Wilson and Palomar
Observatories, but were delayed in the mails and did not
arrive until the afternoon of December 19. All images are
strong and entirely asteroidal in appearance, except for a small
and faint tail visible on the first two plates; there in no
trace of a coma, and with a slower telescope the object would
very likely have been called a minor planet.
1949 U.T. R.A. (1949.0) Decl. Exp. Mag.
mins.
Nov. 19.13194 0 12 19.24 +13 32 2.9 12
22.16369 0 33 33.34 +14 37 28.7 2 12.0:
25.13160 0 52 46.09 +15 30 29.9 15
The following elements and ephemeris are based on
these positions. Although an orbit with a period of six years
leaves a residual of 2.5", the extremely short period given
below is still uncertain by two years or more. The present
ephemeris position, however, should be good to about one
degree."
Elements:
T = 1949 October 13.16581 U.T.
Peri. = 91.94909
Node = 278.63520 1949.0
Incl. = 2.19649
e = 0.4121800
a = 1.7480714
q = 1.028
P = 2.3 years
Residuals:
Delta-RA cos Decl. Delta-Decl.
1949 Nov. 19.13 0"0 -0"1
22.16 -0.1 0.0
25.13 -0.3 -0.1
Ephemeris:
0h U.T.
1949/50 R.A. (1950.0) Decl. Delta r Phase Mag.
"2" "4"
Oct. 27 21 5.3 - 0 14 0.140 1.038 67.6 12.2 11.2
Nov. 4 22 9.1 + 5 6 0.137 1.054 59.2 11.9 11.2
12 23 16.6 +10 8 0.145 1.077 49.9 11.8 11.5
20 0 18.6 +13 52 0.166 1.105 42.0 11.9 11.9
28 1 9.9 +16 14 0.198 1.138 36.8 12.2 12.4
Dec. 6 1 50.5 +17 37 0.240 1.175 34.1 12.6 12.9
14 2 22.7 +18 29 0.291 1.215 33.1 13.1 13.5
22 2 49.1 +19 6 0.349 1.257 33.1 13.6 14.0
30 3 11.8 +19 36 0.416 1.302 33.6 14.0 14.6
Jan. 9 3 36.9 +20 10 0.508 1.359 34.5 14.6 15.2
19 3 59.8 +20 42 0.611 1.418 35.3 15.1 15.8
29 4 21.6 +21 11 0.725 1.477 35.8 15.6 16.3
Feb. 8 4 42.8 +21 36 0.848 1.535 36.1 16.0 16.8
18 5 3.7 +21 55 0.978 1.593 36.1 16.4 17.3
28 5 24.5 +22 8 1.116 1.650 35.8 16.8 17.8
1950 January 3 (1250) Julie M. Vinter Hansen
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