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IAUC 288: PLANET PLUTO; 1930d

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IAUC number 

                                                  Circular No. 288
Bureau Central des Telegrammes Astronomiques
UNION ASTRONOMIQUE INTERNATIONALE
Observatoire de Copenhague


PLANET PLUTO
     Prof. Shapley telegraphs the following position, the mean
of four Mt. Wilson photographic positions:

     1919  U.T.       R.A. (1930.0) Decl.       Mag.
     Dec. 29.0667    6 29 39.8    +19 21 56     19

Daily motion: dR.A. = -5s.14, dDecl. = +6".8.

     Lowell Observatory Circ. dated 1930 May 1 suggests the
symbol Pl for the new planet (representing Pluto and the
name of Percival Lowell).  The same Circ. gives the following
early positions:

     1930      U.T.      R.A. (1930.0) Decl.
     Jan. 23  5h27m5    7 18 56.37   +21 57 40.1
     Febr.23  4 40.0    7 16 36.39   +22  4  6.8


COMET SCHWASSMANN WACHMANN (1930d)
     Dr. Fr. Schuller, at the national Observatory Ondrejov
(near Prague) sends the following positions from long-exposure
photographs taken with the 8-inch Cooke triplet (Foc. length
35.53 inches):

     1930      U.T.      R.A. (1930.0) Decl.
     May 22  22h 4m    18 16 15.3    +34  7 50
         22  23 27     18 16 57.7     34  2 59
         25   0  7     18 50 47.5     31 16 22
         25   1  0     18 51 22.0     31 11 35
         28  22 12     20 15 22.3     20 39 45
         28  23 45     20 16 48.8     20 24 52
         29  23 24     20 41  3.4     16 24  4
         30   0 31     20 42  6.7    +16 10 20

     "Mean error of the places: + 10".

     Length of tails (mu), pos.-angle of tails (P.A.) and integrated
visual magnitudes (Mag.) of the comet in the BD-scale:

     1930    Exposure    mu_1  mu_2 (P.A.)_1  (P.A.)_2  Mag.
     May 22   83 min.      5'    2'   225o      28o      8.7
         25   53 min.      6     3    227       30       8.5
         28   93 min.     11     6    234       31       7.8
         30   67 min.     10     6    242       32       7.4

     The stellar nucleus was double in the 210 mm Clark
refractor (visually); its two components were 8" distant and
connected by a narrow small bridge. Tail 1 was straight,
tail 2 very stubby."

     Prof. G. Struve has observed the comet as follows (B. Z.
der A.N. No. 26):

     1930      U.T.         R.A. (1930.0) Decl.
     June 3   1h 1m32s.3  22 18 38.63   - 2 41 49.9


1930 June 16                   (288)               Elis Stromgren

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