Observation and analysis of R501 on Feb. 21, 2010 (UTC)

Mar. 12, 2010
Kazuhisa Miyashita
Japanese

The detail of R501 (66 Arietis, WDS BU 878) is as follows.

XZ 4484 = SAO 75945 = ZC 501 = 66 Arietis
RA =   3 28 26.5683   PM = 0.00000s
Dec =  22 48 14.430    PM = -0.1114"
Mv = 6.20, Mb = 0.00, Mr = 0.00    Spectrum K0    Approx dia. .0000"

Star is component A in the following system
Name    Cmpt   Yr1  Yr2: PA1   PA2  :   Sep1   Sep2  :  Mag1  Mag2:     #1      #2  mean
BAG   2 Aa,Ab 1986 1989: 297.0   8.0:   0.000   0.200:  6.03  7.40: R   501  ------
BU  878 AB    1881 1991:  78.0  65.0:   1.100   0.800:  6.22 10.45: R   501  ------
BU  878 AC    1911 1997: 226.0 229.0: 151.300 145.800:  6.22 12.50: R   501  ------

WDS Discoverer codes
BAG  Balega, Y.Y. & Tikhonov, N.A.
BU   Burnham, S.W.

The occultation event of this star was observed by five Japanese observers on Feb. 21, 2010.
Separation and position angle between component A and B is obtained from these observations. And the magnitude difference is also estimated.

Double star solution by IOTA coordinator

Comment from Brian Loader (double star coordinator).
Separation 0.773+/-0.085" PA 62.11+/-1.54deg.
This is much closer to the predicted 0.7" and 62.7deg.

Photometry

K. Miyashita M. Ida M. Ishida mean Brighter star: 6.23 +/- 0.01 6.24 +/- 0.01 6.25 +/- 0.01 6.24 +/- 0.01 Fainter star: 10.25 +/- 0.15 10.62 +/- 0.09 10.31 +/- 0.15 10.39 +/- 0.08

Oono's video is slightly satulated. Thus above three observations are used for calculation of magnitude.
The magnitude derived from observation is very close to the value of WDS catalogue.