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Lunar Occultations of Close Double and Kepler2 Stars in June 2017 for Australia and NZ


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

********************************************************************************
 d P    Star  Mag    %         Double details        WDS or   Area of
Jun      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 2 d  118888  9.6   57+ : AB  9.9 10.6  0.89" 146.4 HEI 851   ,AkChIW
 2 d  118987  8.3   60+ : AB  8.3 12.9  1.9"  128.3 J    87   CMST
   ***  118987 is in the Kepler2 program {ID = 201777168}
 2 d   *** Kepler Stars occulted, light curves are desired    BCMRST
 3 d   *** Kepler Stars occulted, light curves are desired    CMS,AkChIW
 4 d X 35802 10.0   77+ : AB 10.6 10.7  0.50" 308.0  TDS8701  ,Ak
 4 d  139224  9.3   78+ : **  9.9  9.9  0.10" 141.0  OCc 642  BCMST,AkChIW
 5 d   *** Kepler Stars occulted, light curves are desired    CMS,AkChIW
 6 d    2113# 7.6   92+ : AB  7.92 9.21 0.42" 310.5  HU  141? BCST,AkChIW
 7 d  159305  9.3   96+ : Aab 9.6  9.6  0.10"  90.0  OCc  21  BR,Ak
 7 d  159415# 8.2   96+ : AB  8.78 9.09 0.04" 101.6  HDS2210  CMS,AkChChW
 8 d  159822  7.8   99+ : **  8.6  8.6  0.10"  90.0  OCc  18  BCST,AkChW
 8 d   *** Kepler Stars occulted, light curves are desired    ,AkChIW
 8 d    2365  7.3   99+ : AB  7.60 8.78 0.27"  51.9  RST3950? ,ChIW
 9 d   *** Kepler Stars occulted, light curves are desired    ,Ch

10 r  160980  7.9   99- : **  8.4  8.4  0.05"  60.0  OCc1522  BR
10 R    2596  7.5   99- : **            0.04" 163.0  OCc1523  BCMRST,AkChW
   *** 2596 is in the Kepler2 program {ID = 227049676}
10 r  161033  9.6   99- : Aab 9.8  9.8  0.40"  87.0  OCc 537  BCRST,Ak
                        : AB  9.7 11.5  9.7"  284.3  B  2431  BCRST,Ak
10 r  161043  9.1   99- : **  9.9  9.9  0.10"  53.0  OCc 536  CMST,AkChIW
10 r  161083  9.5   99- : AB  9.9 10.0  0.40" 123.3  A  2258  BR
10 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
10 r X152648  8.6   98- :     8.6  9.4  7.7"  120.6  OCc1538  M
11 r  161872  8.0   96- : **  9.0  9.0  0.05"  40.0  OCc 454  BCMST,AkChIW
11 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChW
11 R    2733* 6.8   96- : **  7.2  7.2  0.20"  90.0  OCc 455  BCMRST,AkChIW
11 r  162033  8.8   96- : **  9.0 10.0  0.25"  53.0  OCc1559  BCMRST,Ak
11 r  162065  9.0   96- : **  9.5 10.5  1.0"   46.0  OCc 346  BRST
   *** is in the Kepler2 program {ID = 218160323}
11 R    2773  6.2   96- : AB  6.2  9.0  8.2"   90.0  HJ 5082  BR
                        : BC  9.0 10.8 12.7"  128.2  HJ 5082  BR
        2773:  B star is  X163384
13 r    2997#  7.2   86- : AB  7.94 8.04 0.28" 128.0  SEE 512? BCMST,AkChIW
13 r  163737  9.7   85- : ** 10.0 10.0  0.10" 101.0  OCc 827  BR
15 r   *** Kepler Stars occulted, light curves are desired    BCMRST
16 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
16 r  146534  8.1   58- : AB  8.1 10.4  4.6"  107.0  STF2980  BRST
   *** 146534 is in the Kepler2 program {ID = 246092072}
16 r  146575 10.0   57- : AB 10.4 11.1  0.70" 195.0  RST4718  ,AkChIW
   *** 146575 is in the Kepler2 program {ID = 246138854}
16 r  146607  9.1   57- : **  9.6  9.6  0.10"  82.0  OCc 731  M
   *** 146607 is in the Kepler2 program {ID = 246154141}
17 R    3537  6.9   47- : **  7.6  7.6  0.10"  90.0  OCc1134  BCMRST
17 R      15# 7.1   46- : AB  7.1       0.9"  109.0  LSC   4  R
17 r  128583  8.8   46- : AB  8.9 11.7  0.19" 342.7  HDS   9  CMST,I
18 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
18 r  109573  8.9   35- : AB  9.0 11.7  23.5" 356.1  GRV  56  BCMRST,I
   *** 109573 is in the Kepler2 program {ID = 220301335}
19 r  110126  9.9   26- : **  9.8  9.8  0.10"  90.0  OCc  46  ,ChIW
19 r  110164  8.5   25- : **  9.0  9.5   1.0"  10.0  OCc1169  BR
19 r  110161 10.4   25- : AB 10.7 11.4   0.2"  56.8  HEI 836  BCMST,AkChIW
19 r  110169  9.1   25- : AB  9.2 11.8   0.5"  24.1  HDS 250  BCMRST
19 r  110199  9.4   25- : **  9.6  9.6   0.1"  41.0  OCc1009  BCMRST
20 r   93088  9.2   16- : ** 10.0 10.0   0.3"  21.0  OCc1010  BR
20 R     401  6.3   16- : AB  6.3  6.5        247.0  CHR 200  ,Ak
21 R   93617  8.7    8- : AB  9.21 9.40  1.2" 329.6  HO  324  BRST
       93617:  B star is X67423 
   *** X 67423 is in the Kepler2 program {ID = 210474569}
21 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
22 r   94120  8.5    3- : AB  6.9 10.8  0.07" 283.3  PAT  17  ,W
   *** 94120 is in the Kepler2 program {ID = 247056735}

26 d X207403 11.2    7+ : AB 11.3 11.3   7.8" 307.5  HJ  450  CMS 
   *** X207403 is in the Kepler2 program {ID = 211845945}
26 d X109512 10.2    7+ : AB 10.2 10.3   0.9"  32.9  COU 953  ,AkChIW
     X109512:  B star is S97813
26 d X109716  9.9    7+ : AB  9.9 10.7   2.6" 138.6  BRT2387  BR  
     X109716:  B star is X109717
   *** X109716 is in the Kepler2 program {ID = 211811403}
26 d   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
27 d   98570  9.2   14+ : **  9.8  9.8   0.1"  90.0  OCc 198  ,AkChIW
29 d X 17027  9.6   33+ : AB  9.6 11.7   2.2" 205.7  BU  791  BCMRST
30 d X 18086 10.0   43+ : AB 10.6 10.8   0.4"  96.0  TDS8237  M
30 d   *** Kepler Stars occulted, light curves are desired    ,AkChIW
======================================================================

Visibility codes:
Australia: B Brisbane, C Canberra, M Melbourne, R Rockhampton, S Sydney, T Tamworth

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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