378 Proceedings of the Royal Irish Acadetni/. 



'No. 500. Lalandb 29822 Ophitjcii. — Eated 7 m. by Lalande and 

 Harding; 7'0 in D.M. ; 7-3 at Cordoba; but given by Heis as 6-7 



{ir. A., p. 307). 



No. 501. ;^ Ophifcii. — 6 m. Argelander and Heis (»//■= 5 m.). Dr. 

 Gould suspects variation ; the Cordoba estimates varying from 4-3 to 4"7. 

 Franks found " ij/ inferior to x/' and x =^ Ophiucii, April 27, 1878. 

 On May 5, 1875, I found ^ ec^ual to <^ Ophiucii, and slightly brighter 

 than ij/. 



No. 502. BiEMiNGHAM 379 Ophiucii. — Birmingham's Observations,. 

 1873-1876, vary from 7-5 to 9-9-5. 



No. 503. a ScoEPii (Antares). — 2 m. Ptolemy and Sufi, 1-2 m. 

 Argelander and Heis ; 1'4 Gould. Secchi observed some change in its 

 spectrum, and found it '' June 22, 1870, small, scarcely 2 magnitude ; 

 colour rather yellow than red" (Notes to JBirmingham' s Catalog^ie, 

 p. 320). 1-06 and 0-7 H.P. 



No. 504. TyDRACONis.— A double star (0 5 312). 2-9, 9-0 : 141°-7:- 

 5"'26 (Burnham, 1878). " Eogers suspects variability in the small 

 star." (it. A. S. Memoirs, vol. xliv. p. 270). Burnham gives the 

 companion 10-5 m. (1879-274. R. A. 8. -Memoirs, vol. xlvii. p. 290). 



No. 505. (3 Heeculis. — 3 m. Sufi, TJlugh Beigh, Tycho Brahe, 

 Hevelius, and Lalande ; 2-3 Argelander and Heis ; 2-67 Pritchard 

 (1882-387). Sir W. Herschel says {Fhil Trans., 1796), " by my own 

 observations the light of this star seems to be subject to change. 

 Elamsteed's observations give it twice 3 m., and once 2 m." He found 

 it sometimes less, and sometimes brighter than ^ Herculis, which he 

 also suspected of variation. 



No. 506. 29Heeculis. — 5|- Lalande (30111) ; 4-8 Peirce (reduction 

 of Sir W. Herschel's estimates, Sarvard Amials, vol ix) ; 5-6 Heis. 

 Sir W. Herschel sajs {PML Trans., 1796), "very possibly this star 

 may be changeable." 5-00 H.P. 



No. 507. H. ScoEPii = Lacaille 6890. — 5 m. Lacaille ; 5-6 

 Behrraann; 4-3 Yarnall, 1863; 5-6 Cape Catalogue (1877-91). Gould 

 thinks it probably variable between the limits 4 J and 5. 



No. 508. 33 Heeculis.— 7 m. Lalande (30229); 6m. Harding. 

 Not in Keis' Catalogue; 7m. Pranks, April 27, 1878. Sir W. 

 Herschel gives 41, 33. The star is not in the Vranomefria Argentina, 

 so must have been seen below 7 m. at Cordoba. 



April 26, 1878, I found 33 Herculis fainter than 41, and equal to 

 Lalande 30439 (7im.). 



