Journal of Double Star Observations V5, No4

In constellation Orion I observed interesting stellar pairs. Most of these stars have a similar brightness of about 10 magnitudes. An analysis of the proper motion between the components gives information of possible physical relationship between some of them. Observation of Interesting Stellar Pairs in the Constellation Orion with a Possible New CPM Pair At a distance of 185.0 arcseconds a third component C, TYC 1283-00546-1 with a magnitude of 10.15 can be seen. The proper motion is very similar to component A and therefore a physical relationship between the A and C components is possible. A f o u r t h c o m p o n e n t D ( 2 M A S S J05122896+1614415) is at a distance of 159.1 arcseconds. The position angle is 77.5 degrees. There is no information about proper motion in the SIMBAD database [2]. In comparison with my own measurements, component D has a different proper motion and we can expect it to be an optical component. At a distance of 11.3 arcseconds, I found a fifth component E, which is named as GSC2N3032223386. The position angle is 65.2 degrees. This component is also seen on POSS2 image, see Figure 2. Because there is no further information about the parallax of these components, only the proper motion can be used for indication of possible physical relationships. Table 1 gives an overview of the components of both double stars. Table 2 shows the names and the FK5 coordinates, taken from SIMBAD database [2]. The double star observations are made with an 8inch Newtonian telescope with a focal length of 1500 mm. The record of the observations was made with a webcam [3, 4]. Reproduction scale of the optical system is about 0.82 arc seconds / pixel. The analyses of the webcam videos was made with REDUC software package [5]. Acknowledgements This research has made use of the Washington Double Star Catalog maintained at the U.S. Naval Observatory. This research has also made use of SIMBAD astronomical database. References [1] Brian D. Mason, Gary L. Wycoff, and William I. Hartkopf, The Washington Double Star Catalog, http://ad.usno. navy.mil/wds/ Name RA + DEC Magnitudes PA Sep Date PM1 (mas/yr) PM2 (mas/yr) Double star 1 AB 051209+161109 10.22 10.6 152.4° 31.37” 2011.076 48.1 -38.0 2.4 4.80 Double star 2 AB 051218+161406 9.70 10.54 123.0° 36.75” 2011.076 5.0 8.0 12.4 1.2 Double star 2 AC 051218+161406 9.70 10.15 114.2° 185.03” 2011.076 5.0 8.0 5.6 7.5 Double star 2 AD 051218+161406 9.70 77.5° 159.09” 2011.076 5.0 8.0 2.1 8.6 Double star 2 AE 051218+161406 9.70 65.2° 11.28” 2011.076 5.0 8.0 TYC 1283-00166-1 051209.230+161109.05 TYC 1283-00205-1 051210.275+161040.81 TYC 1283-00608-1 051218.158+161405.96 TYC 1283-00586-1 051220.307+161346.26 TYC 1283-00546-1 051229.952+161250.68 2MASS J05122896+1614415 GSC2N3032223386 051228.97 +161441.5 Observation of Interesting Stellar Pairs in the Constellation Orion with a Possible New CPM Pair [2] Centre de Données astronomiques de Strasbourg, SIMBAD astronomical object database: http:// simbad.u-strasbg.fr/simbad/ [3] J. S. Schlimmer, Double Star Measurements Using a Webcam, Journal of Double Star Observations, Vol. 3 No. 3, 2007, Pages 131-134 [4] J. S. Schlimmer, Double Star Measurements Using a Webcam: Annual Report of 2007, Journal of Double Star Observations, Vol. 4 No. 2, 2008, Pages 81-83 [5] Florent Losse, http://www.astrosurf. com/hfosaf/uk/ tdownload.htm