437 3 504 438

PS. Zur Orientirung uber den weiteren Lauf des Cometen - derselbe wird gegen Ende Juli fur uns unsicht- bar - habe ich noch die nebenstehenden Oerter gerechnet.

Herr Dr. Schorr machte mich auf die Aehnlichkeit der Bahn mit derjenigen des Pons -Brooks'schen Cometen 1884 I aufmerksam. Es ware von Interesse, wenn auch die Bahn des Cometen Perrine sich als Ellipse heraus- stellen sollte.

1 2 ~ M. 2. Ber l in .

1898 I a 1 d 1 logy log A

0.1626

0.1920 0.2523

0.3'13 A. B.

O*'577

Ephemeride des Cometen 1898. . . (Coddington-Pauly). Fortsetzung zu A. N. 3500. 1 2 ~ M. 2. Berlin.

1898 log A 1898 log Y log d log Y

1.2600

3.2556

0.2514

0.2415

0.2439

0.2406

0.2311

Juli 25 26 27 28 29 30 3'

Aug. I

3 4 5 6 I 8 9

2

I 0

I 1 I 2

I3 I4 ' 5 16 11 18 '9 20

[qh 9"31' 7 35 5 42 3 53 2 8

r4 o 26 [ 3 58 49

57 '5 55 45 54 '9 52 56 5' 36 5 0 20

49 7 41 58 46 52 45 48 44 48 43 5' 42 5 1 42 I 41 20 40 35 39 53 39 I4 38 38

'3 38 4

-45" 38:s 45 56.0 46 13.2 46 30.2 46 41.0

47 20.1

41 52.6 48 8.1 48 24.8 48 40.8 48 56.7 49 12.6 49 28.4 49 44.2 49 59.9 5 0 '5.7 50 31.5 50 41.3 5 ' 3.1 5 1 19.0 5 1 34.9 5' 50.9 52 6.9 52 23.0

-52 39.2

41 3.6

41 36.4

0.1191

9.1327

0.1461

0.1591

0.1716

0.1835

0. 1948

Aug. 20 21 22

23 24 25 26 21 28 29 30 3'

Sept. I

3 4 5 6 7 8 9

2

I 0 I 1

12

7 3 I4 I 5

r3h38m 45

36 38 36 '4 35 53 35 34 35 18 35 4 34 5 2 34 42 34 35 34 30 34 21 34 26 34 27 34 3' 34 31 34 44 34 54 35 7 35 22 35 38 35 56 36 1 1 36 40

31 33 31 4

I3 31 5

-52"39:2 52 55.5 53 11.8 53 28.3 5 3 448 54 1.5 54 18.3 54 35.2 54 52.2 55 9.3 55 26.6 5 5 44.0 56 1.6 56 '9.3

56 55.2 56 31.2

57 '3.3 5 7 31.6 51 50.1

5 8 8.1 58 21.5 58 46.5 59 5.6 59 24.9 59 44.4 60 4.1

-60 24.0

9.2352

0,2330

0.2312

0.2298

0.2289

0.2283

0.2282

0.2054

0.2154

0.2246

0.2332

0.241 I

0.2483

0.2550

Eine Strassburger Beobachtung vom 21. Juni giebt die Correction -0'3 +0!15.

Berlin 1898 Juni 26. A. Beyberich.

On the Constant of Aberration. From observations made here according to Talcott's

method the value of the constant of aberration is 20!'47 7 f 0!'040.

The constant obtained from stars of average magnitude 4.4 is 20:639 +ofo75. From those of average magnitude 5.4 it is

20!'430 +0!'063,

and from those of average magnitude 6.4 it is 20!'385 -~=0!'066.

The fact that the constant of aberration thus deter- mined is found to depend upon the magnitude of the stars observed may possibly serve to explain differences in the values obtained at different observatories, which differences far exceed their probable errors.

Hongkong Observatory, loth May 1898. W. Doberck.