CHAPTER VII. 
6100 RV HERCULIS. 
R. A. i6 h 56“ 45s; Dec.+ 31° 22' 18" (1900). 
This variable was also discovered by Anderson, and observations began 
immediately after the receipt of the announcement in 1897. If was then rapidly 
fading and passed below the limit of the 6-inch, October 1, and remained below 
that limit till 1898 January 18. The following maximum was well fixed as 1898 
March 15, at magnitude 10.50 on the Harvard scale. The succeeding minimum 
was observed with the 12-, 24-, and 40-inch telescopes, the last by the courtesy 
of Professor Barnard. The four following maxima were well covered by observa¬ 
tions, and the minima of epochs 4, 5, and 12; with sufficient comparisons in 
the intervening time to make sure of the number of the epoch, and to give some 
idea as to how closely the star was following the mean light-curve. 
The positions of the variable and the brighter comparison stars were measured 
with the 6-inch in August, 1897, the fainter stars (those with the Greek letters, 
also k and P) were measured with the 40-inch in June, 1900. 
The photometric measures of the stars brighter than the 12th magnitude 
are more closely accordant than usual, the fainter stars less accordant. The 
difference between the Harvard and Potsdam systems for the three standard 
stars used is 0.25, which is just the mean of the magnitude difference for the 
twelve fields considered. 
Table 52.—6100 RV Herculis. Standard Magnitude Stars. 
1900. 
Magnitude. 
Residuals. 
Star. 
B. D. No. 
R. A. 
Dec. 
Color 
P. DM. 
Catalogue. 
Measured. 
From Cats. 
3 
Nights 
inter 
se. 
H.C.O. 
P. DM. 
H. 
P. 
H. 
P. 
B 
0 
+ 29 2924 
h m s 
16 58 36 
O / 
+29 26.0 
W + 
7 - 5 i 
7.92 
7.68 
7-93 
+ 17 
+ 1 
±4 
F 
+ 32 2835 
16 58 31 
+ 32 02.0 
WG 
6-34 
6.62 
6-37 
6.62 
+ 3 
0 
±5 
G 
+ 31 2967 
17 04 12 
+ 3 1 20.4 
WG- 
6.61 
6.66 
6.41 
6.66 
— 20 
0 
0 
Means.... 
6.82 
7.07 
6.82 
7.07 
±13 
0 
±3 
Table 53.—Comparison Stars in B. D. Catalogue- 
Star. 
B. D. 
1855- 
No. 
Mag. 
R. A. 
Dec. 
b 
e 
O 
+ 31 2949 
+ 31 2951 
9.2 
8.6 
h m s 
16 54 49 
16 55 58 
O / 
4-31 18.6 
4-31 26.8 
87 
