The list shows occultations of possible double stars during November. 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 November 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 brian.loader@slingshot.co.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.
ARCHIVING 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 Nov No v ill magnitudes sepn PA° OCC # Visibility 1 D 15# 7.1 89+ : AB 7.1 0.9" 110.3 HDS 18 ,AkW 2 d *** Kepler Stars occulted, light curves are desired RBTSCM,AkWChI 2 d 109613* 7.6 95+ : ** 8.8 8.8 0.03" 27.0 OCc1153 ,AkWCh *** 109613 is in the Kepler2 program {ID = 220294907} 3 D 298* 7.1 99+ : ** 8.0 8.0 0.10" 90.0 OCc1172 RBTSCM,Ak 3 d 315 7.3 99+ : ** 8.3 8.8 0.30" 221.0 OCc1177 RBTSM,AkWChI 5 r *** Kepler Stars occulted, light curves are desired RBTSCM 5 r 93704 8.9 97- : ** 9.7 9.7 0.06" 241.0 OCc1033 RB 7 r *** Kepler Stars occulted, light curves are desired RBTSCM,AkW 7 r 915 4.6 85- : ** 5.5 6.3 0.02" 178.0 OCc 396 RB,AkWCh 7 r 78027 8.8 84- : ** 2.7 0.02" 58.0 OCc1297 RBTSC,AkWChI 9 r *** Kepler Stars occulted, light curves are desired RBSCM 9 r 1245 7.7 63- : Aab 7.5 7.5 0.04" 353.0 JCT 3 RBT : AB 7.7 10.5 4.4" 346.0 HO 625 RBT *** 1245 is in the Kepler2 program {ID = 211897761} 10 r 98430 7.7 52- : AB 8.32 8.71 1.40" 56.1 STF1322 RBTSC,AkWChI 98430 : B star is X113668 13 r *** Kepler Stars occulted, light curves are desired RBTSC 14 r *** Kepler Stars occulted, light curves are desired R 21 d *** Kepler Stars occulted, light curves are desired ,W 21 d 160947 9.2 7+ : AB 9.2 10.4 0.40" 111.0 CHR 66 ,Ak 21 d 160940 9.2 7+ : ** 9.6 9.6 0.33" 122.0 OCc 525 ,Ak 21 d X 43190 9.7 7+ : ** 9.1 9.7 0.41" 117.0 OCc 526 RB,Ak 21 D 160980 7.9 7+ : ** 8.4 8.4 0.05" 60.0 OCc1522 RB,AkWChI 21 D 2596* 7.5 7+ : ** 0.05" 163.0 OCc1523 TSC,ChI *** 2596 is in the Kepler2 program {ID = 227049676} 21 d 161033 9.6 8+ : ** 9.8 9.8 0.40" 87.0 OCc 537 SCM : AB 9.7 11.5 9.7" 284.3 B 2431 SC 21 d 161043* 9.1 8+ : ** 9.9 9.9 0.10" 53.0 OCc 536 M 22 d *** Kepler Stars occulted, light curves are desired RBTSCM,AkWChI 24 d X 48556 9.9 28+ : AB 10.4 10.7 1.0" 77.1 RST3263 M,AkWChI 24 d 163737 9.7 29+ : ** 10.0 10.0 0.10" 101.0 OCc 827 TSCM 24 d 163760 7.9 29+ : AB 8.7 9.1 0.13" 199.6 SR16269 CM 25 D X 50164 8.3 37+ : AB 8.6 9.7 1.9" 107.9 BU 1262 RBTSC,AkWChI X 50164: B star is X179045 26 d *** Kepler Stars occulted, light curves are desired SC,AkWChI 26 D 3262 6.9 47+ : ** 7.6 8.2 0.01" 75.0 OCc 241 RBT *** 3262 is in the Kepler2 program {ID = 206106840} 26 d 3267 7.3 48+ : ** 8.0 8.0 0.10" 90.0 OCc1621 R 27 d *** Kepler Stars occulted, light curves are desired RBTSCM 27 D 3388 5.5 58+ : AB 6.20 6.34 0.19" 128.4 A 417° RBTSCM,AkWChI 27 d 146534 8.1 59+ : AB 8.1 10.4 4.6" 106.9 STF2980 M *** 146534 is in the Kepler2 program {ID = 246092072} 28 d *** Kepler Stars occulted, light curves are desired RBTSCM,WChI 28 D 3514#?5.9 68+ : AB 6.7 6.7 0.07" 135.4 FTN 359° ,AkW 28 d 146972 9.4 68+ : ** 9.6 9.6 0.10" 90.0 OCc 95 RBTSCM *** 146972 is in the Kepler2 program {ID = 246280444} 29 d *** Kepler Stars occulted, light curves are desired ,AkWChI 30 d *** Kepler Stars occulted, light curves are desired ,AkWChI ====================================================================== Visibility codes: Australia: R Rockhampton, B Brisbane, T Tamworth, S Sydney, C Canberra, M Melbourne 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 A WDS number followed by a ° sign indicates the double has a known orbit. ==================================================================
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 brian.loader@slingshot.co.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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