704 PROGRESS OF ASTRONOMY FOR 1891 AND 1892. 



in biiglitiiess actually detected while under observations, the cause of 

 Avliich still lies beyond us in the unknown characteristics of conietary 

 material. 



Comet 1892 IV : 



—Comet b 1892. 

 =Winneoke's comet. 



Found by Si)italer, at Vienna, on March 18, 

 1892. 



See Comet Winneckc. 



Comet 1892 V: l<:special interest attaches to this ccnuet, as it is 



=Comet e 1892. ^^^ tirst discovered by photoi^raphy, if we except the 

 single case of the " Tewfik comet," shown near the sun on a plate exposed 

 during the total eclipse of May 17, 1882. The present comet was 

 detected as a suspicious looking object upon a plate exposed near « 

 Aquila on October 12, 1892, by Barnard. On the following evening the 

 cometary character of the object was confirmed by the 12-iuch refrac- 

 tor. It was faint, V in diameter, and from twelfth to thirteenth mag- 

 nitude, somewhat condensed toward the center. It changed but little 

 in appearance and was last seen in December. 



Dr. Krueger's elements give a period of revolution of only (>.3 years 

 and show a remarkable resemblance to those of Wolf's comet— so great, 

 ill iiU't, as to suggest a common origin for the two, as in the case of 

 Biela's comet and Brooks's comet, 1889 \. 



Comet 1892 VI: Discovered on August 28, 1892, in the constella- 



=(Jomet d 1892. | tion Gemini, by Brooks, a (piite bright, round nebula, 

 with distinct nucleus and short faint tail; it was visible to the naked 

 eye in November, and the tail could be followed, upon a jihotographic 

 plate, November 26th, for 5° ; after the middle of December the comet 

 was observable only in the southern hemisphere. 



The spectroscope showed a continuous spectrum with the three usual 

 cometary bands. 



Comet 1893 I: , This comet was also discovered by Brooks, at 

 =^Comet (1 1892. | Geneva, X. Y., in the constellation Bootes, on the 

 morning of Novend)er 19, 1892 ; it was then ([uite bright for a telescoi>ic 

 comet, but showed no tail, while its increase in brightness and north- 

 erly motion made it an easy object for observation during the rest of 

 the year. 



In chronicling the comets of the year 1892 mention should l»e made 

 of a susi)i(iou8 oltject detected by Prof. M. Wolf upon ])hot()graphic 

 plates exi)oscd on jNlarch V.) and 20, 1892. It could not be found u[)on 

 a- photograiih of March 22 nor in a later search with the great Vienna 

 refractor. 



The announcement of a ioniet discovered by Freeman on November 

 2(>, IS92, i)roved to be erroneous. 



A comet announced by Swift on December 23, 1889, has been identi- 



