Observation and analysis of R1174 (=SAO79680) in Oct. 11, 2009 (UTC)
Oct. 18, 2009
Reviced May 03, 2010
Kazuhisa Miyashita
Solution of astrometric analysis
Two or more observations make astrometric solution of double star's components possible.
A confirmation observation had been made by Brian Loader who is coodinator for observation of double star occultation.
Brian analyzed his observation with Isida-san's observation, and obtained a good solution. See below.
Brian wrote:
On April 21 I observed R1174 a double previously observed by Ishida-san on
2009 October 11 and on April 22 S 98072 observed by Ishida-san 2009 October 12.
This has enabled me to calculate a solution for these doubles. Attached
are the solutions as generated by Occult.
The solution for R1174 is 0.53" at PA 247.0 deg,
predicted was 0.503" at PA 255.26 deg for 2009 October 11
0.506" at PA 255.65 deg for 2010 April 21.
Observed magnitude differences:
R1174 Ishida 0.52, Loader 0.91, predicted 1.52
Please pass on the result to Ishida-san with my thanks. It is good to be
able to combine results from Japan and New Zealand in this way.
Doublestar Report to IOTA coordinator
2009 Oct 11 at 20h 5m
Star = R1174
Observer = M. Ishida
Telescope = 30.0cm at 135 56 xx.x 35 6 xx.x
Double star details from the XZ catalogue
Star is the mean position of the following pair
HO 247 1887 2007: 101.0 254.0: 0.400 0.500: 7.67 9.19: R 1174 ------ mean
Positions from orbit, on event date
PA = 255.26, Separation = 0.503"
Observation details
Star Mag = 7.49
Event = R D
PA = 274.531
AA = 265.643
l = -0.621
b = 0.021
RV = 0.3834
CCT = -164.72
T1 = 22.38
T2-T1 = -1.27
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Occultation timing report
Place name Moriyama, Shiga, Japan
Representative Masayuki Ishida
TA CED 30 300 +13556xx.x +3506xx.x 84 xx.xM
OA M. Ishida
20091011200521.20 R 1174BRD EG G0.04 1 W 22 AA
20091011200522.39 R 1174ARD EG G0.04 1 E 22 AA
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Light curve
Photometry
Comment and explanation
Ishda-san sent an .avi file of his R1174 observation to me.
Above figure of photometry is the result of my Limovie analysis.
It shows a clear step. And it seems that the magnitude difference is different from newest WDS description.
Astrometry
Brian Loader who is the coordinator for double star observation analyzed the astrometry from above two observation.
Below is his reply for our reports.
Hello Kazuhisa and Ishida-san
>2009 Oct 11 at 20h 5m Star = R1174 Observer = M. Ishida
Thank you for your report.
The calculated step time from the Occult predicted data is 1.24 seconds, very close to your observed time 1.27 seconds.
The magnitudes from the observation are close to a number shown in the interferometric catalog,
the 7.67+9.19 figures in the WDS look to be the most recent, but are outliers.
Best wishes,
Brian
Catalogue details
WDS entries
RA Dec Name Y1 Y2 N PA PA Sep Sep M1 M2
07461+2107HO 247 1887 2007 84 101 254 0.4 0.5 7.67 9.19 F2 +033-007 +033-007 +21
1679 NOD 074607.95+210719.2
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Interferometric catalogue entries
074607.95+210719.2 ADS 6347 HO 247 HD 62720 HIP 37909
07461+2107 N O
Date PA Sep M1 M2
1984.0525 230.8 . 0.397 . . . . . 549 22 3.8 1
McA1987b Sch
1985.8409 232.4 . 0.403 . . . . . 549 22 3.8 1
McA1987b Sch
1986.8921 233.7 . 0.408 . . . . . 549 22 3.8 1
McA1989 Sch
1987.2745 234.3 . 0.408 . . . . . 549 22 3.8 1
McA1989 Sch
1989.2268 236.2 . 0.415 . . . . . 549 22 3.8 1
McA1990 Sch
1991.25 . . . . 8.011 0.006 8.552 0.009 511 222 0.3 1
HIP1997f Thp
1991.25 . . . . 7.96 . 8.54 0.01 505 97 0.3 1
Fab2000a Thp
1991.25 . . . . 8.41 . 8.90 0.01 435 70 0.3 1
Fab2000a Thp
1991.25 238. . 0.418 . 7.41 . 7.95 . 550 0.3 1
HIP1997a Thp
1991.77 245.5 . 0.48 . 7.67 . 9.19 . 530 100 1.4 1
TYC2002 Tty
1991.9025 238.8 . 0.422 . . . . . 549 22 3.8 1
Hrt1994 Sch
1995.9216 242.8 . 0.428 . . . . . 549 22 2.5 1
Hrt1997 Sch
2005.246 251.4 . 0.42 . . . . . 550 24 0.7 1
WSI2006b Sus
2007.8186 254.0 . 0.459 . . . . . 550 24 2.5 1
Hrt2009 Sus
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