IAU COMMISSION 27                             UNPUBLISHED DATA FILE 338E





           UV-LEONIS = HD92109 = SAO99222 = BD+15 2230




NAME OF STAR   
	UV-LEONIS = HD92109 = SAO99222 = BD+15 2230
	COMPARISON STAR = HD91876 = SAO99207 = BD+14 2269
	CHECK STAR = Not Used

NUMBER OF OBSERVATIONS	BAND	NUMBER
                          B       24
                          V       24
			   
PHOTOMETRIC SYSTEM
	Photometer - Optec SSP3 - Planar Diffusion type Silicon PN Photodiode 
		     Detector - 1mm Diaphagm
	Telescope  - 22" (.56m) f10 Cassegrain Celestron 
	Filters    - B Centered Response = 440nn
                     V    "        "     = 540nn 
	                                              
OBSERVATION DETAILS
	Each data point is the average of three 10 second intergrations.
	Following Extinction Coefficients have been applied:
		kv= .391; kb= .357;                   
	All data has been transformed to the UBV system using the following
	tranformation coefficients:
		V= -0.007; B-V= 1.005;                                   
	Observatory location = 119 55 47 W   39 17 43 N

PUBLICATIONS REFERENCES
	International Amateur-Professional Photoelectric Photometry 
	I.A.P.P.P.) Communication (submitted).
	IBVS  (Submitted)
	IBVS 4179, 978, 4472, 4340, 4380
	IAPPPC 61, 50

OBSERVER AND PERSON TO CONTACT FOR FURTHER INFORMATION
	LeRoy F. Snyder              Internet:snyder@rigel.physics.unr.edu
	MacLean/Tahoe Observatories  FAX: (702) 831-5535
	P.O. Box 3964
	Incline Village, NV  89450 USA


**********************************************************************

DIFFERENTIAL MAGNITUDES
Extinction corrected standardized comparison star

  Star        Hel. J. D.   Air Mass     V       B-V
UV-LEO        50544.7266     1.107     9.201
   -          50544.7263     1.107             0.116
UV-LEO        50544.7294     1.105     9.211
   -          50544.7291     1.106            -0.060
UV-LEO        50544.7316     1.105     9.198
   -          50544.7313     1.105             0.175
UV-LEO        50544.7368     1.104     9.300
   -          50544.7365     1.104             0.046
UV-LEO        50544.7392     1.103     9.320
   -          50544.7388     1.103             0.062
UV-LEO        50544.7414     1.103     9.330
   -          50544.7411     1.103             0.088
UV-LEO        50544.7473     1.104     9.412
   -          50544.7470     1.104             0.034
UV-LEO        50544.7499     1.105     9.413
   -          50544.7496     1.105             0.048
UV-LEO        50544.7526     1.106     9.391
   -          50544.7523     1.106             0.061
UV-LEO        50544.7594     1.110     9.358
   -          50544.7591     1.110             0.132
UV-LEO        50544.7618     1.112     9.365
   -          50544.7615     1.112             0.056
UV-LEO        50544.7640     1.113     9.389
   -          50544.7637     1.113             0.123
UV-LEO        50544.7713     1.121     9.259
   -          50544.7710     1.121             0.068
UV-LEO        50544.7731     1.123     9.185
   -          50544.7728     1.123             0.182
UV-LEO        50544.7746     1.125     9.279
   -          50544.7743     1.125             0.021
UV-LEO        50544.7800     1.132     9.149
   -          50544.7796     1.132             0.092
UV-LEO        50544.7825     1.136     9.087
   -          50544.7822     1.136             0.157
UV-LEO        50544.7851     1.140     9.036
   -          50544.7844     1.139             0.119
UV-LEO        50544.7915     1.152     8.995
   -          50544.7912     1.152             0.228
UV-LEO        50544.7937     1.157     8.992
   -          50544.7934     1.156             0.085
UV-LEO        50544.7956     1.161     9.008
   -          50544.7954     1.160             0.081
UV-LEO        50544.8007     1.172     8.950
   -          50544.8004     1.172             0.150
UV-LEO        50544.8023     1.176     8.922
   -          50544.8020     1.176             0.128
UV-LEO        50544.8053     1.184     8.892
   -          50544.8050     1.183             0.157