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DSLR Double Star Astrometry Using an Alt-Az Telescope 223 Thomas G

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DSLR Double Star Astrometry Using an Alt-Az Telescope 223 Thomas G Vol. 10 No. 3 July 1, 2014 Journal of Double Star Observations Page Journal of Double Star Observations July 1, 2014 Inside this issue: Astrometric Measurements of Five Double Stars Report of February 2014 171 Joseph M. Carro Measuring Binaries with Position-Circle and Filar Micrometer-Screw 174 Robert Korn In Search of DAL 45: Observing on the Edge with a 4 inch Refractor Steven C. Smith and John Nanson 179 Double Star Observations with a 150mm Refractor in 2013 185 Marc Oliver Maiwald Analysis of Errors in the Measurement of Double Stars Using Imaging and the Reduc Software 193 Tim Napier-Munn and Graeme Jenkinson A New Double Star in Andromeda 199 T. V. Bryant III 63 New Common Proper Motion Binaries in the LSPM-North Catalog 201 F. M. Rica Double Star Measures Using the Video Drift Method - IV 214 Richard L. Nugent and Ernest W. Iverson DSLR Double Star Astrometry Using an Alt-Az Telescope 223 Thomas G. Frey and David Haworth Double Star Measurements at the Southern Sky with 50 cm Reflectors and Fast CCD Cameras in 2012 232 Rainer Anton Discovery of Stellar Duplicity of TYC 1950-02320-1 During Asteroidal Occultation by (141) Lumen 240 Mitsuru Sôma, Tsutomu Hayamizu, M. Ishida; M. Owada; M. Ida; R. Aikawa, A. Hashimoto, T. Horaguchi, K. Kitazaki, S. Uchiyama, S. Uehara, A. Yaeza, Brad Timerson, T. George, W. Morgan, and E. Edens Announcement: Second Annual Apple Valley Double Star Workshop 245 Announcement: 2014 Lowell Speckle Interferometry Workshop 248 Vol. 10 No. 3 July 1, 2014 Journal of Double Star Observations Page 171 Astrometric Measurements of Five Double Stars Report of February 2014 Joseph M. Carro Cuesta College, San Luis Obispo, California Abstract: From my residence in Paso Robles, California, the position angles and separations of five double stars were measured. The two objectives of this project were to measure the position angles and separations of the aforementioned stars, and to learn the techniques necessary to con- duct this research. 6.0.0.65; both programs are products of Software Methodology Bisque. Those products were used to operate the tele- The observations were made from my house in scope and camera and to reduce the data. During each Paso Robles, California (located about 35o37'36 "N and o viewing session, six photographs of the reference star 120 41'24" W), using a Celestron telescope model CPC and 10 photographs of the target stars were taken. Not 1100. The telescope is computerized, motorized, and all of the photographs were useful, and the number of was equipped with a CCD camera. The telescope is a useful images is reported for each star. Schmidt-Cassegrain design with an aperture of 279mm. For each viewing session, the date, starting time, The manufacturer gives the focal length at 2,800mm. ending time, temperature, humidity, lunar phase, wind, The CCD camera, a model ST-402, is a product of the and visibility were recorded. This author defines Santa Barbara Instrument Group. "visibility" as the number of stars in the Little Dipper After having aligned the telescope with the Global which can se seen without an instrument, and the inter- Positioning Satellite, a reference star was used to set the val is from 1 to 7 stars. focus, and configure the software. The software consist- A literature search was made for each star, and ed of CCD Soft version 5.00.195 and SKY 6 version those sources for which data was reported are listed. Position Separation Star Name WDS Number SAO Number BD Number Date # Obs Angle o Arc seconds HD 218472 in PEG 23079+3128 73021 +30 4881 13 Sept 2013 6 54.6 18.6 WDS 1872 80 10 WDS 2001 14 54.0 18.4 9 - 11:00pm PDT Tem: 20-18oC Hum: 50% ½ moon Wind: calm Vis: 2-3 Both white Other Identifiers ADS 16528 A CSI+30 4881 1 HIC 114224 SAO 73021 AG+31 2387 GC 32222 HIP 114224 SKY# 43909 AGKR 20691 GCRV 14522 IDS 23031+3055 A TD1 29636 BD+30 4881 GSC 02751-00021 2MASS J23075522+3127316 TYC 2751-21-1 CCDM J23079+3128A HD 218472 PPM 88552 WDS J23079+3128A Vol. 10 No. 3 July 1, 2014 Journal of Double Star Observations Page 172 A New Double Star in Perseus Position Separation Star Name WDS Number SAO Number BD Number Date # Obs Angle o Arc seconds ES 1017 in LAC 05278+5009 - +50 1175 27 Sept2013 10 148.6 11.2 WDS 1898 134.0 12.1 WDS 2003 4 148.0 11.2 9: - 11:30pm PDT Tem: 20-15oC Hum: 40% no moon Wind: calm Vis: 3-4 Both white Other Identifiers ADS 15789 A GEN#+0.05402721J LF 4 +55 49 WDS J22152+5530A BD+54 2721 GSC 03986-00232 TYC 3986-232-1 [AC2000b]Trap 895 1 Position Separation Star Name WDS Number SAO Number BD Number Date # Obs Angle o Arc seconds SEI 129 in AUR 05157+3228 - - 29 Dec 2013 6 98.0 8.1 WDS 1895 101 7.5 WDS (Neglected Star) 2001 6 98 8 6 - 9:30pm PST Tem: 10-6oC Hum: 45% no moon Wind: calm Vis: 1-2 Both white Other Identifiers TYC 2394-951-1 WDS 05157+3228 Position Separation Star Name WDS Number SAO Number BD Number Date # Obs Angle o Arc seconds ES 63 in AUR 05357+4118 40463 +41 1227 31 Dec 2013 9 174.3 8.0 WDS 1894 172 6.4 WDS 1998 174 8 7:30: - 9:30pm PST Tem: 10-5oC Hum: 40% no moon Wind: calm Vis: 1-2 White, blue Other Identifiers ADS 4173 A CSI+41 1227 1 IDS 05287+4114 A TYC 2918-966-1 AG+41 579 ES 63B 2MASS J05354300+4118235 WDS J05357+4118A BD+41 1227 GSC 02918-00966 PPM 48259 CCDM J05357+4118A HD 36720 SAO 40463 Position Separation Star Name WDS Number SAO Number BD Number Date # Obs Angle o Arc seconds ES 891 in AUR 05274+5422 - +54 892 31 Dec 2013 10 72.2 8.1 WDS 1910 1 72 8 7:30 - 9:30pm PST Tem: 10-5oC Hum: 40% no moon Wind: calm Vis: 1-2 White, blue Other Identifiers ADS 4023 A CCDM J05274+5422A IDS 05192+5417 A TYC 3748-134-1 AG+54 468 CSI+54 892 1 2MASS J05272442+5422161 WDS J05274+5422A BD+54 892 GSC 03748-00134 PPM 29837 Vol. 10 No. 3 July 1, 2014 Journal of Double Star Observations Page 173 A New Double Star in Perseus Acknowledgements Grateful appreciation is given to Russell Genet at Cuesta College, for his training on the methodology and use of the CCD camera and software, to Tom Smith for the correct versions of the software, and to Eric Weise for the software updates. This research made use of the SIMBAD database operated at CDS, Strasbourg, France, and the Washing- ton Double Star Catalog maintained by the United States Naval Observatory. References Mason, B., et al., 2012, Washington Double Star Cata- log For the stars in this report, no data was found in the following references: Hipparcos and Tycho Catalogue, 2011 Hoffleit+, 1991, The Bright Star Catalogue, 5th Re- vised Edition, Yale University. Clark, R. ed; Journal of Double Star Observations - all issues McEvoy B., 2011, Herschel 500 Double Star List Muenzler, K., 2003, Eagle Creek Observatory OAG catalog 2003, as reported by the WDS; original list and all 26 supplements Vol. 10 No. 3 July 1, 2014 Journal of Double Star Observations Page 174 Measuring Binaries with Position-Circle and Filar Micrometer-Screw Robert Korn Gailenberg, Germany Abstract: A method for measuring visual binaries using position-circle and modified micro- scope accessories is described. The measurements of 61 binaries measured in the fall of 2012 are presented and some deviations from values published in the WDS are discussed. I have done systematic binary observations, i.e. astronomical reticle ocular combined with a microme- measuring separation and position angles, since 2008. ter-screw. In my experience, there are no such items, Before that, this category of targets mostly met my in- new or used, at an affordable price on the market. terest for test purpose only. Instead, I found interesting microscope accessories Now that I am 63 years old, my patience while ob- from the Russian manufacturer Lomo. On the Europe- serving has improved, but the sensitivity of my eyes an market there is a micrometer screw device with has decayed. So I changed from visual observing deep- moving reticle plate and ocular available for about sky-objects to the “realm of binaries”. €150. I ordered one and found that this device can be My telescope is quite a veteran; a C8 “orange”, used with an astronomical telescope: Some modifica- manufactured by Celestron in the late '70's. It is an ex- tions and an adapter to fit the different diameters are cellent telescope, able to completely resolve binaries necessary, but this should be no problem for the do-it- down to 0.6" and doing (for a telescope of its class) yourself-experienced amateur. A great advantage of outstanding work on the planets! See Figure 1. The the device: its components can be freely adjusted to- instrument is mounted on an also veteran Vixen AT- gether over wide ranges. LUX based on a massive concrete pier. The ATLUX The focal length of the ocular is about 16mm, thus stepper motors are driven by an FS2-control unit from resulting in a magnification of about 120x. This allows Michael Koch, Germany. This mounting may be measuring separations greater than 10”.
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