74 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



3) 



B. Fl. 756 (5^"). 



As there is no oi magnitude star in the position of the one, whicli in the British Catalogue is 

 called 27 Camelopardalis, Argelander thought the observation of it, made on 1690, January 22, 

 might be only a repetition of 24 Gmnelopardalis, still in the field. 



The observations as they stand in the Historia Ccelestis, II, page 286, are shown in the first 

 five colniHus of the following table. The other columns give the names of the stars, the arcs cor- 

 responding to the readings _2Jer strias cochlea', and the differences of these with the readings 2>er 

 lineas diagonales. 



Index error -^-()' 0. 



The field of Flamsteed's telescope being 80', the star 24 Camelopardalis would have left the field 



40' 



y^ sec. S = 4"' 49' after transiting (supposing the transit wire to have been pretty near the center), 



that is at S'' 27'" 50" clock time. As the questioned star {x) was observed after 8'' 26'" 41% when 

 26 Camelorxirdalis transited, Argelander's hypothesis seems not impossible. Still, of the 1'" 15" 

 that 24 GamelopardaUs remained yet in the field, a ])art was certainly taken up by tiie readings for 

 26 Camelopardalis, so that the former must have been quite near the edge already when observed. 

 That here is not the remark ^'posttraiisitum" which Flanisteed probably never has omitti d in such 

 cases, seems to indicate rather a star in transitu. Of stars in right ascension between 26 and 29 

 Camelopardalis, and nearly uiiou the parallel of 24 Camelopardalis, the Uurchmusterung has the 

 following : 



altogether too faint for Flamsteed's telescoi^e ; but they, especially the two latter stars, should be 

 watched as to variability. We must confess, however, that shifting the hypothesis from an 

 " extinct" to a variable star, is but a very unsatisfactory exiiedient. I am rather inclined to sup- 

 pose that ill some way, now unaccountable, the zenit distance was recorded erroneously. Only 

 about 20' or 22' farther north is 28 Camelopardalis (Dm. -f 56o.l()5i). 0"'.6), which in 1696 pre- 

 ceded 20 Camelopardalis in right ascension by 5% hence tiaiisited near tlie limit assigned for the 

 time, which itself was not recorded. 



4J 



B. Fl. 864 (5'^). 



The observation of this star stands (Historia Ccelestis, II, p. 411) between r; Geminontm and 

 5 Monocerotis, thus: 



1701,Feb.2. 



h. ni. 8. 

 8 12 56 



16 



Gemiuorum ?; 



Mouocerotis post trausitum 

 m 



o ' /' 



29 4 



58 2 



.57 49 20 



658. 82 

 1307. 42 

 1310. 70 



28 56 40 

 57 52 40 

 57 40 



Index error — 9' 20" 



