2 2 1 37 10 2 2 2

Jahr verschwunden war, welches Ereigniss meine grosste Auf- merksamkeit erregt hatte. Da ich damals noch Neuling auf diesem Gebiete war, so veraumte ich, ausser an Herrn

Weber in Peckeloh, Nachricht iiber den Fall zu geben, doch spielt diese Stelle des Himmels bei meioen Beob- achtungen noch heute eine Rolle.

Ilmenau, 1901 April 5. I;. Schwab.

Nova (3.1901) Persei. (Auszug aus dem Harvard College Observatory Circular No. 5 7 ) .

The early observations made here, of the new star in Perseus, are described in A. N. 3704 (Circular No. 56). This star may be designated Nova Persei, No. 2, to distinguish it from the star in RA. 1 ~ 5 5 4 1 1 , Decl. +56" 15', which ap- peared in this constellation in 1887.

Nova Persei

Isochromatic plate

Nova Persei

Isocliromatic plate

Nova Aurigae

ordinary plate

taken on February 24, 1901, with an exposure of 66", be- ginning at 1 4 ~ 4 3 ~ Gr. M. T. The change from the first form of spectrum to the second must have been very sudden. A plate taken through dense clouds on February 23, with an exposure of 29m, beginning at I x h 37" Gr. M. T., showed %tit little 'change,' while Professor Vogel has announced that a photograph taken the same night shows a spectrum tra-

The third spectrum versed by several broad, hazy bands.

Harvard College Observatory,

The accompanying figure gives enlar4ements, of three photographs of spectra taken with the I I inch Draper tele- scope. The first represents the new star in Perseus taken on February 2 2 , 1901, with an exposure of 4om, beginning at 1 6 ~ grn Gr. M. T. The second represents the same star

1901

Febr. 22

1901

Febr. 24

I 892 Febr. 5

represents Nova Aurigae, taken on February 5 , 1892, with an exposure of 123'", beginning at 1xhgrn, Gr. M. T. It will be seen that the second and third spectra closely resemble each other, but that the lines in Nova Aurigae are much narrower and more sharply defined. The later photo- graphs of the spectrum of the new star in Perseus show numerous changes, the dark lines and the edges of the bright lines being, in many cases, well defined.

1901 March 1 5 . Edward C. Pickering.

Planet (319) Leona. In der Opposition I 90 I vergeblich gestlcht. M. Wolf.