The list shows occultations of possible double stars during October. 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 October 2018 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
Oct      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 r     881# 6.3   59- : AB  6.3  7.6  0.14" 319.7  STT 118° ,Ak
          881:  B star is X 32224
 1 r   77678* 7.7   58- : **  8.8  8.8  0.10" 151.0  OCc 882  ,WChI
 1 r   77751  9.6   58- : Aab 9.5  9.8  0.45" 120.3  CHR 214  RBTS
                        : AB  9.5 12.7  3.1"  342.1  HU  449  RBT
 1 r   77757* 7.9   58- : **  8.7  8.7  0.04" 285.0  OCc1046  RBT
 2 R    1047* 5.3   47- : Aab 6.1  6.1  0.10" 350.0  OCc 628  ,AkWCh
 2 r    1054  7.0   47- : Aab 7.6  7.6  0.10"  65.0  OCc 847  RBTSC,Ak
                        : AB  7.0 11.4  21.4" 169.6  STT 161  RBT
 2 r    1069# 7.9   45- : AB  8.0  8.3  0.10" 179.6  CHR 215  M
 2 r   78997  9.2   45- : AB  9.3 12.7  1.4"  312.7  COU 924  M

 3 r   79818  7.3   35- : AB  7.32 9.46 0.75" 134.4  HO  250  BT,AkWChI
                        : AC  7.3 13.0  9.5"  156.4  HO  250  BT,AkWChI
 3 r   79871* 9.0   34- : **  9.6  9.6  0.10" 318.0  OCc 805  R
 4 r   *** Kepler Stars occulted, light curves are desired    RBTSC,AkChI

11 D    2137  6.6    6+ : **  7.2  7.2  0.05" 350.0  OCc1469  ,I
12 d   *** Kepler Stars occulted, light curves are desired    RBTS,AkWChI
13 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,Ak
13 d  160088  9.7   20+ : AB 10.1 11.3  0.14" 332.9  HU  313  .I
14 d   *** Kepler Stars occulted, light curves are desired    RB,AkWChI
14 d  160595  9.3   27+ : AB  9.3 10.7  2.2"  75.6   HU 1180  ,Ak
14 d X 42570  9.0   28+ : AB  9.0 12.5  2.6"  147.0  B  1864  RBTSC,AkWChI
   *** X 42570 is in the Kepler2 program {ID = 226728233}
14 d  185560  9.8   28+ : AB  9.9 11.9  1.8"  329.0  HU  752  RBTSM
14 d  185642* 8.3   29+ : **  8.7  8.7  0.10"  90.0  OCc  37  SCM
15 D    2666  4.9   36+ : AB  5.03 7.43 1.69" 278.9  JC    6  ,AkWCh
         2666:  B star is X156529
16 d X 45755  9.5   46+ : AB  9.6 11.9  0.40" 153.2  HDS2727  ,AkWCh
   *** X 45755 is in the Kepler2 program {ID = 217323447}
16 d X 45841  9.8   46+ : AB  9.9 11.5  1.8"  346.7  I   647  ,WChI
16 d X 45941 10.1   47+ : ** 10.1       0.06"   7.0  OCc1731  RBTSCM
16 d    2845  8.4   48+ : **  9.1  9.1  0.10"  90.0  OCc  39  RTCM
17 d X 47675  8.9   56+ : AB  8.9 10.6  2.8"    3.0  HU   80  ,AkWChI
17 D    2940* 7.4   56+ : AB  7.5 10.22 0.06" 235.8  HDS2873° M,AkWChI
18 d  163998  8.9   65+ : **  9.3 10.0  0.21" 310.0  OCc 351  ,W
18 d X 49463  9.3   65+ : AB  9.4 11.2  8.6"  178.4  HLD 165  RBTS,AkWChI
18 D    3071  6.1   65+ : **  6.8  8.2  0.43"  77.0  OCc 607  BTSC,AkWChI
19 d    3207  8.2   75+ : AB  8.2 11.4  1.45"  32.0  RST4092  ,AkWChI
19 d  164809# 7.6   76+ : AB  7.7 10.2  0.31"  55.5  HU  282  M
21 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
22 d  128631  7.8   94+ : AB  7.8  9.3  7.6"  291.0  STF   8  B,AkWChI
       128631:  B star is X 54701
23 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI

25 r     393  6.7   99- : **  7.6  7.6  0.10"  90.0  OCc1191  ,AkW
25 R     401# 6.3   99- : AB  6.3  6.5        247.0  CHR 200  RBT
26 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
26 R     523  6.4   96- : **  7.3  7.3  0.10"  90.0  OCc1208  TSCM,AkWChI
   ***    523 is in the Kepler2 program {ID = 210501067}
27 r     684# 6.2   90- : AB  6.97 7.02 3.10" 276.0  STF 559  R
   ***    684 is in the Kepler2 program {ID = 247031423}
27 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,Ak
28 r   77292  8.7   82- : AB  9.0 10.0  0.51"  41.3  COU 270  RBT,AkWCh
28 r   77293  7.6   82- : AB  7.6 10.8  9.4"  267.0  MZA  17  ,WChI
28 r   77287* 8.3   82- : AB  8.4 11.1  3.3"  328.8  A  2107  ,AkWChI
29 r   78507  7.4   73- : **  8.5  9.1  0.02" 350.0  OCc 210  ,AkWCh
29 r   78575  8.6   73- : **  9.7  9.7  0.10" 152.0  OCc 849  R
29 r   *** Kepler Stars occulted, light curves are desired    ,Ak
30 r   79608  9.3   62- : **  9.2  9.2  0.30"  90.0  OCc 212  ,AkWCh
30 r X103997  9.5   61- : AB  9.6 11.1  8.7"  323.7  A  2107  ,AkW
30 R    1174# 7.5   61- : AB  7.67 9.19 0.54" 261.4  HO  247° R
31 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
31 r   80317  8.3   51- : **  8.3 10.6  0.04"  98.7  OCc 637  ,AkWChI
   ***  80317 is in the Kepler2 program {ID = 211984243}
31 r   80327  7.8   51- : AB  7.9  9.6  0.63" 138.2  COU  47  ,AkWChI
   ***  80327 is in the Kepler2 program {ID = 211989558}
31 r    1293  6.8   50- : Dab 6.67 9.87 0.50" 247.3  CHR 156  B 
   ***   1293 is in the Kepler2 program {ID = 211954451}
31 r    1294  7.3   50- : AB  7.3 12.3  0.8"  289.9  BU  584  B
   ***   1294 is in the Kepler2 program {ID = 211955190}
31 r    1297* 6.8   50- : AB  6.8  8.5  0.12" 159.9  CHR 130° R
   ***   1297 is in the Kepler2 program {ID = 211941583}
31 r   98020  7.6   50- : **  9.1  9.1  0.05" 350.0  OCc1392  RBT,AkWChI
   ***  98020 is in the Kepler2 program {ID = 211964025}
31 r   80340  7.9   50- : **  8.8  8.8  0.05" 111.0  OCc1074  ,AkWChI
   ***  80340 is in the Kepler2 program {ID = 211973658}
31 r    1302  6.8   50- : **  7.5  7.5  0.05" 350.0  OCc1939  RBTSC,AkWChI
   ***   1302 is in the Kepler2 program {ID = 211966197}
         1302:  B star is S 98018   
31 r    1305  6.9   50- : **  7.2  9.1  0.02" 102.1  OCc 638  TSC,AkWChI
   ***   1305 is in the Kepler2 program {ID = 211976270}
31 r X111579  9.7   49- : AB 10.5 10.5  0.50" 269.0  TDS6092  SC
31 r   98124  9.3   49- : **  9.8  9.8  0.10" 257.0  OCc 755  CM



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

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.

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

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 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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