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 2019 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.

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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,AkW
 2 d X126123 10.9   12+ : AB 10.9 11.2 10.7"   70.0  BAL 224  SCM,I
   *** X126123 is in the Kepler2 program {ID = 251539584}
 2 d   *** Kepler Stars occulted, light curves are desired    ,AkWChI
 4 d  159140  8.0   32+ : **  8.8  8.8  0.36" 324.0  OCc1019  ,ChI
 5 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 5 D    2308  7.9   42+ : AB  7.6  9.0  1.2"   53.9  KOU  51  M,AkWChI
 6 D    2436# 6.6   52+ : AB  6.6  7.6  4.5"  233.0  SHJ 240  ,AkWCh
         2436:  B star is 160179  
 6 d  184976  8.8   53+ : AB  8.8 12.2  5.9"  180.0  HWE  38  RBT
 6 D  184983  7.9   53+ : **  9.4  9.4  0.10"  90.0  OCc  43  R
 6 d   *** Kepler Stars occulted, light curves are desired    RSM
 7 d X 43003  9.5   62+ : AB  9.8 11.4  0.09" 317.4  HDS2524  ,AkWChI
 7 d X146727 10.0   63+ : AB 10.2 12.7  0.62" 163.5  HDS2530  BTSCM,AkWChI
 8 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 8 d  187361  8.9   72+ : AB  9.0  9.3  9.6"   51.0  HJ 5070  ,AkWChI
       187361:  B star is 187362
 8 D    2749  5.0   73+ : **  5.8  5.8  0.05" 350.0  OCc1557  R
 9 D  188551  7.5   81+ : AB  7.68 9.91 3.75" 136.9  BU  467  SCM,AkWChI
 9     188551:  B star is X170931
 9 d  188569* 8.0   81+ : AB  8.63 9.31 1.38" 334.9  STN  49  RBTSCM
       188569: B star is X171059
10 d X 48905  9.6   89+ : AB  9.6 10.3  5.2"  357.0  HLD  40  SCM
11 d X 50371  9.7   94+ : AB 10.6 10.2  0.8"  214.2  HU 1313  RB
11 d    3171# 3.7   95+ : AB  4.6  4.6  0.01" 253.0  gam Cap° RT
12 d  164962  7.9   97+ : **  8.7  8.7  0.05" 350.0  OCc1619  RBTSCM,Ak
12 d   *** Kepler Stars occulted, light curves are desired    M,AkWChI
13 d   *** Kepler Stars occulted, light curves are desired    R
13 d  146509  7.1  100+ : **  8.1  8.1  0.10"  67.0  OCc 709  ,AkWChI
   *** 146509 is in the Kepler2 program {ID = 245995301}

14 r  146928  7.8  100- : AB  7.9 10.1  0.20" 359.9  LSC 112  ,WChI
16 r     178  6.6   95- : AB  6.5  9.5  1.3"  155    STT  27  ,AkWChI
   ***    178 is in the Kepler2 program {ID = 220292272}
16 r   *** Kepler Stars occulted, light curves are desired    ,AkWCh
17 R     298* 7.1   90- : **  8.0  8.0  0.10"  90.0  OCc1172  ,AkWChI
17 R     303  6.4   89- : **  7.2  7.4  0.40" 115.0  OCc1174  RBTSCM
17 r     315  7.3   89- : **  8.3  8.8  0.30" 221.0  OCc1177  ,WChI
17 r  110398  9.3   88- : **  9.1 10.1  0.20" 277.0  OCc1179  M
18 r   93130  9.6   82- : ab 10.2 10.6  0.10" 350.0  OCC9078  RB
19 r X  4712  9.3   75- : AB 10.1 10.1  0.09"  79.2  HU 1064  ,AkW
   *** X  4712 is in the Kepler2 program {ID = 210547540}
19 R   *** Kepler Stars occulted, light curves are desired    RBTSC,AkW
20 R     668* 3.5   66- : Aab 3.6  6.0  0.20" 108.0  WSI  53  ,AkWCh
20 r   94001  9.1   65- : AB  9.2 12.1  1.01" 170.8  A  2951  ,AkWChI
20 R     691* 6.3   64- : AB  6.9  7.4  0.04" 117.8  L     4  BTSCM,AkWChI
   ***    691 is in the Kepler2 program {ID = 247227122}
20 r   *** Kepler Stars occulted, light curves are desired    RBT
20 r X 70403  9.2   64- : BA  9.3  9.0  2.0"  163.7  STF 567° RB
     X 70403;  A star is S94032
20 R   94031* 7.4   64- : AB  8.68 7.73 0.47" 354.6  STT  86° RBTSCM,Ak
   ***  94031 is in the Kepler2 program {ID = 247214390}
21 R     817* 4.9   55- : **  5.6  5.6  0.10"  90.0  OCc   1  BTSC,AkWChI
21 r   77219  9.0   54- : **  8.8 10.8  4.5"  165.0  OCc1262  ,AkWChI
21 r X  7117  9.6   53- : AB  9.7 10.8  1.5"  302.1  A  2106  BTSCM
22 R     982  6.8   44- : AB  7.31 7.86 0.10" 355.2  BAG   5° ,AkWChI
                        : AC  6.6  7.5  0.20" 350.0  OCC9120  ,AkWChI
22 R     983  6.1   44- : AB  6.1  6.7  0.05" 337.6  MCA  26° ,AkWChI
22 r X  9102  9.2   43- : AB  8.9 12.0  6.0"  104.0  DAM1155  ,AkWChI
22 r   78416# 9.1   43- : **  9.4 11.0  0.12" 319.0  OCc1698  ,AkWChI
23 r   79499 10.0   32- : ** 10.0 10.0  0.10" 324.0  OCc 794  R
24 R   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
26 r   *** Kepler Stars occulted, light curves are desired    R 
26 r   99202  7.8    6- : **  7.7 10.2  0.38" 285.6  OCc 663  R
   ***  99202 is in the Kepler2 program {ID = 248917776}

30 D   *** Kepler Stars occulted, light curves are desired    RBTSCM,ChI


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

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.
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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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