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


The list shows occultations of possible double stars during August. 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 August 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
Aug      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 5 d  118568  9.6    6+ : AB  9.7 12.0  0.63" 246.7  HDS1560  ,I
 5 D X 16397 10.0    6+ : AB  9.9 11.4  7.8"  227.0  HJL 133  BCMRS
 6 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
 6 d  119033  8.1   12+ : AB  6.3      11.9"  186.0  LAF  44  BRS
   *** 119033 is a Kepler2 star  {ID = 201650346}
 7 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
 7 D    1785  7.8   19+ : AB  8.0 10.0  0.66" 147.7  AGC   4  ,AkChIW
   ***  1785 is a Kepler2 star {ID = 229061224}
 8 d  139242  9.2   27+ : AB  9.3 12.8  1.3"  121.6  A  2584  ,AkChIW
 8 d X 36019 10.0   28+ : AB 11.2 11.4  2.3"  220.3           BCMRS,AkChIW
 9 d   *** Kepler Stars occulted, light curves are desired    BCMRS,ChIW
10 D    2113  7.6   46+ : AB  7.92 9.21 0.42" 310.2  HU  141  ,ChI
11 D  159415  8.2   56+ : AB  8.78 9.09 0.04" 109.5  HDS2210  CMS,AkChIW
11 d X 39817  9.6   56+ : AB 10.4  10.6 1.8"  302.2  BRT2836  R
12 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
12 D    2365  7.3   65+ : AB  7.60 8.78 0.27"  54.0  RST3950  BCMRS,AkChIW
13 D    2495  6.0   74+ : AB  6.34 7.56 2.42" 263.4  BU  126  BCMRS,AkW
                        : AC  6.3 11.2 12.1"  137.5  BU  126  BCMRS,AkW
        2495:  B star is X141441
13 d  160486  9.4   75+ : AB  9.6 12.3  5.2"  327.5  ARA 249  BR
13 d  160513  8.6   75+ : **  9.2  9.2  0.10"  90.0  OCc  14  BR
13 d  160517* 8.6   75+ : **  9.6 10.0  1.0"  320.0  OCc1501  ,AkChIW
14 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
14 d X151825  9.7   83+ : AB 10.1 11.8  6.1"  278.7  HJ 2820  BCMRS,Ak
                        : AC 10.1 13.1 13.4"   81.2  HJ 2820  BCMRS,Ak
   *** X151825 is a Kepler2 star  {ID = 227345588}
14 D    2647* 6.5   83+ : **  7.2  7.2  0.10" 270.0  OCc  12  BR
                        : AB  6.5 13.0  8.5"  168.9  RST3170  BR
14 d  161282* 8.9   83+ : Aab 9.5 10.1  0.40" 130.0  TDT 781  ,AkChIW
                        : AB  9.1 12.5  10.4" 348.8  ARA 275  ,AkChIW
14 d  161338* 7.0   84+ : **  7.4  9.0  0.9"  315.0  OCc1541  ,AkChIW
15 d   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
15 d  162160* 8.4   90+ : **  9.4  9.6  0.12"  26.0  OCc 546  BCRS,AkChIW
15 d  162183  8.5   90+ : **  9.2  9.2  0.10"  94.0  OCc 540  BR
15 d    2808  7.5   91+ : AB  7.6 11.0  24.9"  75.7  HWE  97  ,AkChIW
   ***  2808 is a Kepler2 star  {ID = 219181570} 
16 d  163418  7.5   97+ : AB  7.5 11.6  0.76"  71.2  HDS2894  CM
17 D    3066  6.0   99+ : **  6.7  6.7  0.10" 350.0  OCc  19  BR
17 d    3083# 7.3   99+ : AB  7.3 10.0  3.5"  184.5  STF2752  R

19 r  146344  7.8   98- : **  8.6  8.6  0.25"  70.0  OCc1629  BCMRS,AkChIW
19 r  146348  9.0   98- : **  9.7  9.7  0.10"  90.0  OCc 173  BCMRS,AkChW
19 r  146419  8.4   98- : AB  9.3  9.5  0.04"  69.0  HE16544  ,AkChIW
20 r  146960* 8.6   93- : **  9.5  9.5  0.30"  90.0  OCc 125  BCMRS,AkChIW
21 r   *** Kepler Stars occulted, light curves are desired    BCMRS,AkChIW
21 r  109439  8.8   87- : **  9.4 10.0  0.05"  65.0  OCc1029  BCMRS,Ak
21 r X  1177  8.5   85- : AB  9.45 9.68 1.62" 231.3  HDO  37  BCMRS
     X  1177:  B star is X53809
   *** X  1177 is a Kepler2 star  {ID = 220331205}
22 r  109988  8.1   79- : AB  8.1 11.2  0.20" 193.0  YSC 141  ,AkW
   *** 109988 is a Kepler2 star  {ID = 220492184}
24 r X 66785  9.6   55- : AB 10.0 12.8  2.4"  336.2  HU 1065  BCMS,AkChIW
24 r   *** Kepler Stars occulted, light curves are desired    BCMRS
25 R   94019  6.7   44- : **  7.9  7.9  0.05"  89.0  OCc 954  BCRS,AkChIW
25 r X 70478 10.1   43- : AB  9.8 12.0  0.20" 262.0  PAT  13  ,Ak
26 r   94663  9.0   32- : AB  9.7  9.6  0.39" 311.3  A  2354  BR,AkChW
26 r   94678* 7.6   32- : **  7.7  8.7  0.8"   96.0  OCc1266  BCRS,AkChIW
26 r   94763# 8.8   31- : AB  8.8  9.8  1.0"  329.6  STF 770  M
       94763:  B star is  X 76729
27 r   *** Kepler Stars occulted, light curves are desired    BCMRS,AkCHIW
27 R    1006  7.1   22- : **  7.7  7.7  0.05" 350.0  OCc1323  ,ChIW
27 r   95945  9.4   22- : ** 10.0 10.0  0.50" 230.0  OCc 398  BCMRS
28 R    1142  8.0   14- : AB  8.0 11.8  3.6"  118.2  A  2871  ,AkChIW
28 R   97067# 8.9   13- : AB  9.2  9.7  0.30"  49.3  A  2874  BCMRS
28 r   97084* 9.4   13- : **  9.8  9.8  0.10" 270.0  OCc 338  BCMRS
28 r   97106  8.7   13- : **  9.4  9.4  0.05" 350.0  OCc 332  M 
29 r   *** Kepler Stars occulted, light curves are desired    BCMRS,Ak

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

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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