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Lunar Occultations of Close Double and Kepler2 Stars in December 2016 for Australia and NZ


The list shows occultations of possible double stars during December. 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 December 2016 and visible from parts of Australia or New Zealand are listed. 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.

NEW - ARCHIVING OF 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
Dec      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 D    2686  5.1    6+ : Aab 6.0  6.0  0.10"  90.0  OCc  22  ,Ch
 2 D  161834  7.5    7+ : AB  7.75 9.00 0.40" 153.2  RST3198  B,AkChW
 2 D    2731# 6.6    7+ : AB  6.87 8.14 0.51" 154.6  KUI  88  BR
 2 d   *** Kepler Stars occulted, light curves are desired    BCRS,AkChIW
 2 D  161847# 8.4    7+ : **  9.1  9.1  0.02" 141.6  OCc1790  R
 2 D  161850  7.2    7+ : AB  7.2 13.0 10.4"  337.4  RSS 491  BR
   *** 161850 is in the Kepler2 program {ID = 218532187}
 2 D  161883# 8.3    7+ : AB  8.4 11.2  8.7"   34.7  J  1658  BCRS
   *** 161883 is in the Kepler2 program {ID = 218638515}
 2 d X161015# 9.9    7+ : ** 10.4 11.0  0.26" 104.1  OCc1791  BCRS
 2 d X161022 11.0    7+ : AB 11.3 11.6  0.9"  134.0  TDT1080  S
 2 d X 44785* 9.8    7+ : AB 10.4 10.6  0.50"  97.0  TDT1075  BR
 2 d X 44825*10.3    7+ : AB 10.7 11.0  0.50"  75.0  TDT1081  BCRS
 2 d X 44833  9.4    7+ : AB  9.6 12.4  0.70"   0.0  RST3200  BCS
 3 D  162937  7.9   14+ : **  8.6  8.6  0.10"  90.0  OCc  25  CMS
 4 d  163689  9.3   21+ : AB 10.1 10.1  0.32" 110.6  RST5551  BCMRS
 4 d X 48675  8.4   21+ : AB  9.0  9.5  3.7"   24.8  HJ 1537  BCMRS,I
       48675:  B star is X175379
 5 d  164351  9.0   29+ : **  9.3  9.3  0.10"  90.0  OCc  24  ,ChW
 5 d X 50212  9.3   30+ : AB  9.3 11.0  4.0"  256.1  BU  272  CS,AkChIW
 6 d   *** Kepler Stars occulted, light curves are desired    BCMRS,ChI
 8 d  147007  9.0   61+ : AB  9.1 12.5  2.10" 310.0  RST4735  ,AkChW
 9 d X  1177* 8.5   72+ : AB  9.45 9.68 1.62" 231.3  HDO  37  ,AkChW 
     X  1177:  B star is X 56809
   ***  X  1177 is in the Kepler2 program {ID = 220331205}
 9 d   *** Kepler Stars occulted, light curves are desired    BCMS
12 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
12 d   93652  9.2   96+ : **  9.6  9.6  0.05" 116.0  OCc1224  B
   *** 93652 is in the Kepler2 program {ID = 210510363}   
13 D     764* 4.9  100+ : AB  5.8  5.8  0.10"  65.8  A  3010  BCMRS

14 R     913# 5.1   99- : AB  5.1  6.1  0.06"  65.8  MCA  24  BCMRS,AkChW
15 r   96396  8.5   97- : **  9.5  9.5  0.10"  90.0  OCc  29  BR,AkChIW
15 r   96646  9.3   96- : **  9.2 11.0  0.07" 262.0  OCc 359  R
                        : AB  8.8 12.4  3.1"  300.4, A  2524  R
16 r   *** Kepler Stars occulted, light curves are desired    BCMR
16 r    1203  7.1   91- : **  7.9  7.9  0.05"  90.0  OCc 286  ,AkChW
16 R    1236  5.1   90- : AB  5.30 6.25 1.13"  13.6  STF1196  BCMRS,Ch
                        : AC  5.3  5.8  6.3"   60.5  STF1196  BCMRS,Ch
        1236:  B star is X108006, C star is S 97646   
16 r   97651  9.3   90- : **  9.7  9.7  0.10"  90.0  OCc  32  CMS
16 R    1241  6.5   90- : AB  6.4 12.3  1.6"  327.7  BU 1243  BCMRS
   ***  1241 is in the Kepler2 program {ID = 211825317}
17 r    1354# 7.5   83- : AB  7.65 9.39 0.15" 357.0  HDS1323  ,I
17 r   98391  8.5   82- : AB  8.5  9.9  7.8"   63.1  STF1317  BCMRS
17 r   98396  8.8   82- : **  9.3  9.3  0.10" 345.0  OCc 800  BCMRS
17 R    1371  6.5   82- : Aab 7.2  7.2  0.14" 126.6  FIN 347  BCMR
18 r    1466  5.3   74- : **  6.0  6.0  0.05" 350.0  OCc1407  BCRS,AkChW
20 r   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
20 r  118987  8.3   54- : AB  8.3 12.9  1.9"  128.3  J    87 ,I
   *** 118987 is in the Kepler2 program {ID = 201777168}
21 r   *** Kepler Stars occulted, light curves are desired    BCRS,Ak
22 r  139224  9.3   35- : **  9.9  9.9  0.10" 141.0  OCc 642  ,AkChIW
24 R    2113# 7.6   18- : AB  7.92 9.21 0.42" 310.3  HU  141  BCMRS
24 r  158854  8.9   18- : AB  9.30 9.84 0.40" 230.4  RST3898  M
25 r  159360  9.1   11- : AB  9.2 13.6  1.3"  328.4  HU  151  ,Ak  
25 R  159415  8.2   11- : AB  8.78 9.09 0.03" 105.9  HDS2210  R
26 r   *** Kepler Stars occulted, light curves are desired    B
26 r X 41028 10.1    6- : AB 10.2 13.2  4.4"  216.3  RST3948  R
   *** X 41028 is in the Kepler2 program {ID = 205614050}
26 R    2365  7.3    6- : AB  7.60 8.78 0.27"  53.0  RST3950  R

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

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

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

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

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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