The list shows occultations of possible double stars during January. Although the main emphasis remains on stars with separations < 2", now that the more detailed lunar limb profile from LOLA is available, some wider pairs are included. Doubles predicted to be occulted by the Moon during January 2017 and visible from parts of Australia or New Zealand are included. The listing is a very abbreviated version of predictions produced by Occult plus an indication of the region of visibility. Observers need to generate their own precise predictions using Occult.
The list below is generated by OCCULT for a 25cm telescope. Some of the events could be beyond the reach of smaller telescopes. Observations of all pairs in the list are highly desirable. Those showing an OCc number have been reported as non-instantaneous at a lunar occultation. Confirmation or otherwise of any double nature is wanted.
*** Kepler stars: the nights on which they are occulted are indicated. Individual Keplers are only shown if they are also a known or possible double. Light curve of occultations of all Kepler stars are desired.
Please send reports of all observations of these stars to Brian Loader at palbrl@clear.net.nz, including any made in earlier months and not so far reported. And of course if you observe a stepped event for a star, which is not a known double, please report this. More details about reporting follow the predictions.
NEW - ARCHIVING OF OCCULTATION LIGHT CURVES
For ALL lunar occultations: single, double and Kepler K2 stars a csv file should be prepared for archiving. This can be done through the OBSERVATIONS EDITOR of OCCULT.
It will be necessary to generate a light curve using LIMOVIE and save or copy its csv file. You will also need to note the time, hh:mm:ss.sss of one frame and the corresponding frame number.
Then in the Observations Editor select the entry for the star and use the menu bar option to create a Light Curve Report. Follow the instructions on the new screen which appears. There is a help file. It is suggested that light curve reports be emailed in batches rather than singly. They are sent directly to Dave Herald from the program.
******************************************************************************** d P Star Mag % Double details WDS or Area of Jan No v ill magnitudes sepn PA? OCC # Visibility 2 d *** Kepler Stars occulted, light curves are desired BCMRS 5 d *** Kepler Stars occulted, light curves are desired BCMRS,I 5 d 109307 9.6 45+ : ** 9.8 9.8 0.10" 90.0 OCc 26 ,Ak 6 d *** Kepler Stars occulted, light curves are desired BCMRS,AkChIW 6 d 109988 8.1 57+ : AB 8.1 11.2 0.20" 193.0 YSC 141 BCMRS,AkChIW *** 109988 is in the Kepler2 program {ID = 220492184} 7 D 354* 5.5v 67+ : ** 6.3 6.3 0.05" 46.0 OCc 984 ,AkW 7 d 92953 8.3 68+ : ** 9.3 9.3 0.10" 87.0 OCc 981 B,AkChIW 7 d 92989 9.2 69+ : ** 9.7 9.7 0.05" 74.0 OCc 980 CMS 7 d 92992 8.7 69+ : ** 9.5 9.5 0.30" 86.0 OCc 983 BCMS 9 d *** Kepler Stars occulted, light curves are desired CS,AkW 9 D 93913 7.0 87+ : ** 7.6 10.6 0.18" 108.8 OCc 615 ,AkIW 9 D 653* 4.8 87+ : ** 5.6 5.6 0.04" 53.0 OCc 952 ,AkChIW : AC 4.4 9.6 10.8" 83.0 DRS 37 ,AkChIW 9 d 93933 8.0v 87+ : ** 8.7 8.7 0.02" 23.0 OCc 553 R 9 d 93958 7.8 88+ : ** 9.0 9.0 0.50" 279.0 OCc 532 BCMRS,AkChIW 9 D 93962 7.0 88+ : ** 7.0 0.01" 267.2 OCc1235 BCMRS,AkChIW 9 d 93967# 7.8 88+ : AB 9.37 8.09 0.06" 234.0 COU 567 CMS,AkChIW 9 d 94019 6.7 88+ : ** 7.9 7.9 0.05" 89.0 OCc 954 R 10 d 94684 7.2 95+ : AB 7.23 10.9 0.80" 69.4 HDS 749 CMS,I 11 d *** Kepler Stars occulted, light curves are desired CMS 11 d 1006* 7.1 99+ : ** 7.7 7.7 0.05" 350.0 OCc1323 BR 11 d 95928 9.2 99+ : BA 9.6 9.3 0.9" 269.0 A 2452 BCS 11 d 1034 8.1 99+ : ** 8.7 8.7 0.05" 350.0 OCc 365 R 12 r 1175 4.9 100- : ** 5.8 5.8 0.10" 90.0 OCc 229 BCMRS 13 r *** Kepler Stars occulted, light curves are desired BCMRS,AkChIW 13 r 97970 8.9 98- : ** 9.8 9.8 0.10" 262.0 OCc 606 ,ChIW *** 97970 is in the Kepler2 program {ID = 211795547} 14 r 98720 8.7 94- : AB 8.8 11.1 0.50" 86.0 HDS1397 BCMRS 15 r 99153 7.2 88- : AB 7.5 8.6 0.43" 123.4 STT 220 BR 16 r 118840 9.7 80- : AB 9.9 11.7 0.50" 12.0 HDS1624 BCMRS 16 r *** Kepler Stars occulted, light curves are desired BCRS 17 r *** Kepler Stars occulted, light curves are desired BCRS 18 r *** Kepler Stars occulted, light curves are desired ,AkChIW 19 r 1965 6.5 53- : ** 7.3 7.3 0.05" 350.0 OCc1453 BCMRS0,AkChIW *** 1965 is in the Kepler2 program {ID = 212801410} 19 r *** Kepler Stars occulted, light curves are desired BR,AkChIW 21 r X 39376 10.1 33- : AB 10.9 10.8 0.60" 104.8 RST3915 BCMRS 23 r 160209 8.7 17- : AB 9.2 9.6 0.7" 192.5 HU 162 BCMRS 23 r X138809!10.9 16- : ** 11.2 12.6 0.10" 271.9 OCc1798 BCRS 23 R 2447* 8.0 16- : ** 8.2 8.7 0.04" 132.0 OCc1497 BCS 23 r X 41797#10.2 16- : AB 10.9 11.0 0.30" 182.1 RST3061 BCMRS 24 R 2555* 7.5 10- : BA 10.3 7.6 1.0" 130.4 HU 186 ,AkChIW 2555: WDS lists A star as X144366 25 r *** Kepler Stars occulted, light curves are desired R 30 D 3333# 6.4 6+ : AB 6.79 7.88 2.39" 305.9 STF2935 R 3333: B star is X183491, dT ca -12 sec ====================================================================== Visibility codes: Australia: B Brisbane, C Canberra, M Melbourne, R Rockhampton, S Sydney NZ (following a ,) Ak Auckland, W Wellington, Ch Christchurch, I Invercargill. ---------------------------------------------------------------------- Stars with previous occultation observations: #: Observations indicating double - these need further checking *: Observations not showing double - need confirmation !: Recent video discoveries - confirmation needed. ?: Uncertain double observation, confirmation or otherwise needed ==================================================================
The most convenient way of reporting is to use Dave Herald's OCCULT which has a Double Star report option in the Observations editor. Before using it, generate a light curve with Limovie and copy to the clip board. Your graph will be attached to the email which you can then send to palbrl@clear.net.nz.
Otherwise in reporting please include your name and positional data as for other occultations reports, also your telescope type and method of observing and timekeeping.
For each event give the star name and the times of each step of the event with the corresponding accuracy. The limb PA, Rv and Cct of the event would also be useful.
In addition to measures of the PA and separation of binary stars, there is also a need for an estimate of the magnitude difference. An estimate of this can be made from the step sizes shown by Limovie data. So if possible a determination should be made of the size of each step together with an estimate of accuracy.
Please also report cases where a double event is predicted but none detected. These are especially likely with stars shown with an OCc designation
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