The list shows occultations of possible double stars during September. 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 September 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.

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.

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 d P    Star  Mag    %         Double details        WDS or   Area of
Sep      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 1 D    2733* 6.8   77+ : **  7.2  7.2  0.20"  90.0  OCc 455  ,AkWChI
 1 d  161872  8.0   77+ : **  9.0  9.0  0.05"  40.0  OCc 454  ,AkWChI
 1 d  162033  8.8   78+ : **  9.0 10.0  0.25"  53.0  OCc1559  RBTSCM
 1 d  162065* 9.0   79+ : **  9.5 10.5  1.0"   46.0  OCc 346  R
   *** 162065 is in the Kepler2 program {ID = 218160323}
 1 D    2764* 6.4   79+ : **  7.1  7.1  0.10"  90.0  OCc1561  ,WChI
 1 d    2787#?6.3   80+ : AB  6.35 9.16 0.70" 108.6  HDS2710  M
   ***   2787 is in the Kepler2 program {ID = 218473951}
 3 D    2997  7.2   91+ : AB  7.94 8.04 0.28" 127.8  SEE 512° ,WChI
 3 d    3029  7.0   92+ : **  7.7  7.7  0.10"  90.0  OCc 290  ,AkWChI
 3 d  163737  9.7   92+ : ** 10.0 10.0  0.10" 101.0  OCc 827  RBTSC
 3 d  163760  7.9   92+ : AB  8.7  9.1  0.13" 199.6  SR16269  R
 5 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,Ak
 5 d  165111  8.7  100+ : Aab 8.8 11.4  0.40"  71.0  HSD3183  SCM
   *** 165111 is in the Kepler2 program {ID = 206189649}

 7 r    3537  6.9   98- : **  7.6  7.6  0.10"  90.0  OCc1134  RBTSCM,AkWChI
 7 R      15# 7.1   98- : AB  7.1       0.9"  109.0  LSC   4  RBTSCM
 8 r  109573  8.9   94- : AB  9.0 11.7 23.5"  356.1  GRV  56  ,AkWChI
   *** 109573 is in the Kepler2 program {ID = 220301335}
 8 R  109613  7.6   93- : **  8.8  8.8  0.03"  27.0  OCc1153  RBTSCM
   *** 109613 is in the Kepler2 program {ID = 220294907}
 8 R   *** Kepler Stars occulted, light curves are desired    RBTSCM,I
 9 r  110164  8.5   87- : **  9.0  9.5  1.0"   10.0  OCc1169  RBTSC
 9 r  110169  9.1   87- : AB  9.2 11.8  0.50"  24.2  HDS 250  RBTS,AkW
 9 r  110199  9.4   87- : **  9.6  9.6  0.10"  41.0  OCc1009  RBTSC,AkWCh
 9 R     298  7.1   86- : **  8.0  8.0  0.10"  90.0  OCc1172  SCM
10 R     401  6.3   79- : AB  6.3  6.5        247.0  CHR 200  ,AkWChI
11 r   93617# 8.7   67- : AB  9.21 9.40 1.23" 329.5  HO  324  RB
       93617: B star is X 67423
   ***  X 67423 is in the Kepler2 program {ID = 210474569}            
11 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
11 r   93652  9.2   66- : **  9.6  9.6  0.05" 116.0  OCc1224  SCM
   ***  93652 is in the Kepler2 program {ID = 210510363}
12 r   94117  9.6   56- : Aab 7.4  9.1  0.30" 273.0  PAT  15  RB     
   *** 94117 is in the Kepler2 program {ID = 247002634}
12 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
12 r   94120  8.5   56- : AB  6.9 10.8  0.07" 283.6  PAT  17  TSCM,AkWChI
   ***  94120 is in the Kepler2 program {ID = 247056735}
12 r   94132# 8.1   56- : AB  8.1 10.0  9.3"  318.0  STF 598  RBT
       94132  B star is 94131
13 r X  7660  9.0   44- : ** dMag = 2.2 0.01" 257.0  OCc1279  RBTSCM
13 r   94918  9.0   44- : **  9.8  9.8  0.10" 141.0  OCc1044  RBTSCM
13 R     888* 6.0   43- : **  6.8  6.8  0.05" 350.0  OCc1284  M
14 r   78788  8.4   33- : **  9.2  9.2  0.10" 104.0  OCc 890  RBTSCM
14 r    1048  8.5   33- : AB  8.5 12.0  6.9"  229.3  HO   26  BTSCM
16 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,ChI
17 r   98770  9.4    7- : AB 10.0 10.3  0.40" 103.6  MRL   2  B
17 r X 14772 10.1    7- : AB 10.2 10.8  2.5"  343.2  HEI  58  RB

22 d   *** Kepler Stars occulted, light curves are desired    TSCM,AkWChI
22 d  139427  8.7    5+ : AB  8.7 11.8  4.7"  348.8  A    12  ,AkWCh
   *** 139427 is in the Kepler2 program {ID = 212819198}
23 d X 37934 10.4   10+ : AB 11.1 11.2  0.7"   26.0  RST3876  RB
23 d X 37938 10.7   10+ : AB 10.7 10.9  1.3"   56.0  RST3877  RBT
     X 37938:  B star is X128792
23 d X 38046 10.0   10+ : AB 10.5 11.5  0.8"  194.5  RST3880  CM
26 d    2447* 8.0   35+ : **  8.2  8.7  0.04" 132.0  OCc1497  M
27 d  160795  8.8   43+ : AB  8.9 12.2  2.17" 222.3  A  2250  BTSCM,ChI
27 d X 42838 10.1   43+ : AB 10.2 10.8  2.5"  256.9  A  2251  M
28 d X157875  9.1   52+ : Bab 9.1  9.9  1.0"   89.0  BU  966  ,AkWChI
     X157875  Bb star is X157876
28 d  161607#10.0   52+ : AB 10.1 10.6  2.2"  281.1  B  1887  RBTSCM
28 d  161656? 7.7   53+ : **  9.0  9.0  0.10"  67.0  OCc 970  ,ChI
28 d    2715* 6.3   54+ : AB  6.7  9.3  0.60"  54.0  V3879Sg  R
29 d   *** Kepler Stars occulted, light curves are desired    ,AkWChI
29 d X 45992  9.8   62+ : AB  9.9 10.3  1.9"  201.3  HLD  35  ,WChI 
29 D  162637  7.2   62+ : AB  7.2 11.0  0.20" 234.0  TOK 367  ,WChI
   *** 162637 is in the Kepler2 program {ID = 218683659}
29 d  162753  8.3   63+ : AB  8.4 10.1 20.5"  110.8  HJ 5128  RBTSCM
                          BC 10.1 10.5  4.2"  128.0  HJ 5128  RBTSCM
      162753:  B star is X169143, C star is X169144          
   *** 162753 is in the Kepler2 program {ID = 218542513}
30 d X 48192  7.8   72+ : AB  8.3  9.2  3.2"  326.7  H N 138  ,AkWChI
     X 48192,  B star is X173991
======================================================================

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 double number followed by ° indicates double has a known orbit.

==================================================================

Reporting Your Observations

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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