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


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

********************************************************************************
 d P    Star  Mag    %         Double details        WDS or   Area of
Jul      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 2 r X  6679 10.1    4- : AB 10.6 11.2  0.4"   93.5  COU 369  ,AkW
 2 r X 73159 10.4    4- : AB 10.6 12.1  1.2"   82.0 TDS3115   ,Ak
 2 r   94430# 9.8    4- : AB  9.8 11.3  1.0"  136.3 A  2430   BR
 2 R     787# 7.1    4- : AB  7.7  8.3  2.7"  164.9 STF 670   BCRS
         787:  B star is X 73437 see next            
 2 R X 73437# 8.3    4- : Bab 8.5 11.0  0.70" 161.3 COU2580   BCRS
 2 r X 73471 10.1    3- : AB 10.1 10.4  1.9"  231.2 COU  38   BRS

 6 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
 8 d   99087  9.1   16+ : **  9.5  9.5  0.10" 259.0  OCc 756  ,AkChIW
 9 D  118736  7.9   25+ : AB  7.9 12.9  8.1"  100.0  TOK 140  M    
   *** 118736 is a Kepler2 star {ID = 201832337}
 9 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
10 D    1732  6.8   33+ : **  7.6  7.6  0.10" 129.0  OCc 708  CS,AkChIW
11 d  138944* 8.5   43+ : **  9.6  9.6  0.05"  90.0  OCc1438  ,ChI
12 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
13 D    2043  6.5   62+ : **  7.4  7.4  0.10"  90.0  OCc  16  ,AkChIW
14 d    2184  7.3   73+ : AB  7.0       0.20" 153.6           CMS
15 D    2279  6.1   80+ : **  7.0  7.0  0.10"  90.0  OCc1485  CMS,AkChIW
17 D  160678# 7.6   93+ : Aab 8.2  8.8  0.10" 206.8  YSC 178  ,AkChIW
            #           : AB 7.71 10.11 0.73"  91.8  HDS2485  ,AkChIW
17 d  160686# 9.3   93+ : AB  9.5 11.3  0.19" 130.1  HDS2486  CS,AkChIW
17 d X 42732# 9.8   93+ : AB  9.8 10.5  2.0"  271.1  HLD 138  CS,AkChIW
17 d  160757* 9.4   93+ : ** 10.1 10.1  0.10"  90.0  OCc 535  M,AkChIW
17 D    2555*10.3   94+ : BA 10.3  7.6  1.0"  130.5  HU  186  BCMRS,AkChIW
17 D X144366  7.6   94+ : AB  7.6 10.3  1.00" 310.5  HU  186  BCMRS,AkChIW
     X144366: nominally R 2555 (above) is the B star
18 D    2686  5.1   97+ : Aab 6.0  6.0  0.10"  90.0  OCc  22  BCRS,AkW
18 d   *** Kepler Stars occulted, light curves are desired    R
18 d  161834  7.5   98+ : AB  7.75 9.0  0.40" 153.2  RST3198  R
19 d    2871* 7.3  100+ : AB  7.2  7.4  9.9"  236.1  S   722  ,I, dT = -18sec
        2871:  B star is 2870
19 d  162593  8.6  100+ : **  9.2 10.5  0.14" 242.0  OCc 460  ,AkW

20 R    2995# 6.1   99- : AB  6.8  7.0  0.13" 142.7  FIN 336  ,AkChIW
20 r  163579* 8.2   99- : **  9.0  9.0  0.10"  90.0  OCc  23  BR
20 R    3015  5.2   99- : AB  5.38 7.31 0.32" 122.6  HU  200  CMS
20 r X 48675  8.4   99- : AB  9.0  9.5  3.7"   24.8  HJ 1537  R
21 r  164253  9.1   97- : **  9.4  9.4  0.10" 111.0  OCc 972  ,AkChW
21 r    3109  6.6   97- : AB  6.7 10.9  0.50" 253.3  YSC 118  BCMRS,AkChIW
21 R    3119* 6.9   97- : AB  7.5  7.5  0.10"  90.0  WRH      BCMRS,AkChIW
21 r  164351  9.0   97- : **  9.3  9.3  0.10"  90.0  OCc  24  BMS,AkChIW
21 r X 50212  9.3   97- : AB  9.0 11.0  4.8"  255.1  BU  272  BCMRS,AkW
21 R    3155  6.7   96- : **  7.6  7.6  0.10"  90.0  OCc1605  BCMRS
22 r   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
22 r  146047  9.7   91- : ** 10.1 10.1  0.50"  90.0  OCc1624  BCMS
   *** 146047 is a Kepler2 star  {ID = 206266051}
22 r    3296  8.1   91- : **  9.5  9.5  0.30"  90.0  OCc1626  BCMR
23 r    3415# 8.3   84- : **  8.9  9.4  0.03" 129.9  OCc1802  ,AkChIW
24 r  128612* 9.7   75- : **  9.9  9.9  0.10"  90.0  OCc 124  ,ChIW
24 r  128649  8.6   74- : AB  8.6 12.3  0.20" 198.0  BAG  35  BCMRS
24 r  109113  7.9   73- : AB  7.9 10.3  9.9"  214.3  STF  23  CM
      109113:  B star is X55003
25 r   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
25 R  109667  7.3   64- : Bab 7.3 12.0  0.30"  39.0  TOK 202  ,ChIW
                        : **  7.3  9.0  1.1"  247.6  OCc1157  ,ChIW
25 r  109692  9.4   63- : AB  9.9 10.6  0.24" 227.9  BU 1292  BCMRS
26 R     300  7.5   52- : AB  7.82 9.09 0.20" 155.5  MCA   4  BCMS,ChI
28 r   93652  9.2   30- : **  9.6  9.6  0.05" 116.0  OCc1224  BCRS,AkChIW
   *** 93652 is a Kepler2 star  {ID = 210510363}
28 r   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
28 r   93704  8.9   29- : **  9.7  9.7  0.06" 241.0  OCc1033  BCMS
28 r X  5224  9.5   28- : **  9.9 10.6  0.48" 101.4  OCc 617  M
29 r   94189  9.6   20- : ** 10.0 10.0  0.05" 350.0  OCc1246  B
30 R X  7838# 8.0   11- : AB  8.82 8.97 3.03" 150.1  STF 813  BRS,Ak
     X  7838:  B star is X 79582
30 r X 79562 10.3   11- : AB 11.0 11.1  0.50" 147.0  TDS3414  ,ChIW
30 r X 79857 10.7   11- : AB 11.0 11.3  1.1"   40.7  TDS3427  BR
30 r X 79854#10.2   11- : AB 10.9 10.9  0.50" 211.0  TDS3426  BCRS
31 r   *** Kepler Stars occulted, light curves are desired    BMR
31 r X 95406 11.0    5- : ** 11.0 11.3  3.3"  286.0  OCc1339  BRS
   *** X 95406 is a Kepler2 star  {ID = 202089182}
       X 95406, fainter star is X 95403
31 r    1060  7.3    5- : **  8.2  8.2  0.03"  30.0  OCc1340  CM

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

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

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

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

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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