Observation and analysis of SAO79337 in Nov. 7, 2009 (UTC)
Jan. 11, 2010
Kazuhisa Miyashita
in Japanese
An occultation event of this star is observed by three Japanese observers in Nov. 7, 2009.
This is a report on analysis of astrometry and photometry of this double star.
Doublestar Report to IOTA coordinator
Double star details from the XZ catalogue
Star is component A in the following system
HO 345 AB 1890 1991: 282.0 286.0: 0.900 1.200: 9.57 10.45: S 79337 X100798
HO 345 AC 1890 2003: 230.0 229.0: 23.900 24.700: 9.57 13.50: S 79337 ------
Observation details
H. Karasaki M. Ishida M. Kashiwagura
Star Mag = 9.57 Star Mag = 9.57 Star Mag = 9.57
Event = R D Event = R D Event = R D
PA = 240.712 PA = 241.115 PA = 251.340
AA = 233.983 AA = 234.387 AA = 244.603
l = 0.630 l = 0.671 l = 0.600
b = -0.307 b = -0.306 b = -0.264
RV = 0.3639 RV = 0.3800 RV = 0.4081
CCT = -141.63 CCT = -142.82 CCT = -151.74
T1 = 48.25 T1 = 24.14 T1 = 57.14
T2-T1 = -2.47 T2-T1 = -2.28 T2-T1 = -2.95
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Occultation timing report
TA CED 20 146 +13940xx.x +3544xx.x 84 xx M
TB CED 30 300 +13556xx.x +3506xx.x 84 xx M
TC CED 30 192 +14008xx.x +3822xx.x 84 1xx M
OA H. Karasaki ***.***.**.com
OB M. Ishida ***.***.**.jp
OC M. Kashiwagura ***.***.**.jp
20091107152245.78 X100798BRD EG G0.07 1 W 224 AA
WDS HO 345
20091107152248.25 X 10979ARD EG G0.07 1 E 22 AA
WDS HO 345
20091107151821.84 S 79337BRD EG G0.04 1 F 22 BB
20091107151824.14 S 79337ARD EG G0.04 1 B 22 BB
20091107152854.19 X100798BRD EG G0.17 1 F 224 CC
20091107152857.14 X 10979ARD EG G0.04 1 B 22 6CC
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Light curve and Explanation
i) Karasaki's observation
ii) Ishida's observation
iii) Kashiwagura's observation
The star is so faint that the star's is difficult to find on the video frame.
Lomovie gleaned small signal from noisy background.
And the rather clear light curve has been obtained with Gaussian filtre for light curve.
The error margin of first event is rather large (0.17seconds) because the light curve is scattered by the large background noise.
Photometry
i) Karasaki's observation
ii) Ishida's observation
i) Karasaki's observation
Result
Brighter component Fainter component
Karasaki's observation : 9.57 +/- 0.05 10.93 +/- 0.16
Ishida's observation : 9.57 +/- 0.04 11.19 +/- 0.16
Kashiwagura's observation : 9.58 +/- 0.05 10.58 +/- 0.11
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From IOTA coordinator
[Jan. 11, 2010]
Thank you for the report on the observation of S79337 by Kashiwagura-san.
You have also sent me reports on this event observed by Ishida-san and Karasaki-san.
This has enabled me to make a solution for the double:
PA 300.46±2.34°, separation 0.639±0.078".
I will attach the solution as generated by Occult.
Kind Regards
Brian
IOTA coodinator's astrometry
[Dec. 8, 2009]
The timings for S79337 look to be agree with those by Karasaki-san.
Since the Position Angles of the two events are so close, I have not attempted to determine the PA and separation.
But they will be very useful if we can get another observation of the pair.
Regards,
Brian
[Nov. 29, 2009]
Thanks you for the two observations of the double stars S79337 and X101356.
For S 79337 I estimate the expected step time as 2.48 seconds, very close to the observed time 2.47 seconds.
For X 101356 I estimate the expected step time as 1.22 seconds a little shorter than the observed 1.33 seconds.
I have received no other observations of the stars.
Peter Anderson in Australia noted S 79337 as a double at an occultation observation in 2000.
X 101356 has no archived occultation observation.
Kind regards,
Brian