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Lunar Occultations of Close Double and Kepler2 Stars in August 2017 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 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.

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 d P    Star  Mag    %         Double details        WDS or   Area of
Aug      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 D    2279* 6.1   68+ : **  7.0  7.0  0.10"  90.0, OCc1485  BCMRST,AkChW
 2 d   *** Kepler Stars occulted, light curves are desired    BCMST,AkChIW
 2 d X 41431  8.9   76+ : AB  9.7  9.8  3.4"   85.0  SKI  10  R
 3 d  160513  8.6   82+ : **  9.2  9.2  0.10"  90.0  OCc  14  ,AkChW
 3 d   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
 3 d  160661  9.2   84+ : AB  9.3 11.8  2.3"  251.0  DON 847  CM,ChI
 4 d X152851  9.4   89+ : AB  9.5 11.3  6.7"   46.6  B  2859  ,AkChW 
   *** X152851 is in the Kepler2 program {ID = 227065848}
 4 d X152648  8.6   89+ : **  8.6  9.4  7.7"  120.6  OCc1538  ,W
 4 d  161202# 9.3   89+ : Aab 9.3 10.5  0.20"  60.3  CHR 234  ,Ak
 4 d   *** Kepler Stars occulted, light curves are desired    ,AkChIW
 4 d  161229  8.8   89+ : **  9.6 10.6  0.05" 296.0  OCc 566  ,AkChIW
 4 d X153948# 9.4   89+ : **  9.9 10.5  0.07"  54.0  OCc1748  ,AkChIW
 4 D  161255* 7.4   89+ : Aab 6.8  9.3        265.0  SNA  85  ,AkChIW
                        : **  8.0  8.6  0.08" 280.0  OCc 564  ,AkChIW
 4    161257? 7.7   89+ : **  9.0  9.0  0.05" 350.0  OCc1539  ,AkCkIW
 4 D    2658* 5.8   90+ : **  6.2  6.2  0.05" 350.0  OCc1542  M,AkChIW
 4 d  161399  9.2   90+ : AB  9.8 10.7  0.10" 192.0  CHR 235  ,I
 4 d  161400# 9.2   90+ : **  9.4 10.1  0.20" 228.0  OCc 474  BCMRST,AkChIW
 4 D    2680* 5.6   91+ : **  6.6  6.6  0.10" 322.0  OCc 988  CM,AkChIW
 5 d   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
 5 D    2787? 6.3   94+ : AB  6.35 9.16 0.70" 108.6  HDS2710  ,ChIW
   ***  2787 is in the Kepler2 program {ID = 218473951}
 5 D    2794* 6.6v  95+ : **  7.5  7.5  0.10"  90.0  OCc1569  ,AkChIW
 5 D    2814# 4.9   95+ : **  4.9  9.7  0.7"  180.5  OCc 599  BCMRST
 5 D    2816  7.0   95+ : AB  7.0 10.4 37"    157.8  H S  77  BCMRST,AkW
   *** 2816 is in the Kepler2 program {ID = 218404213}
 5 d    2828* 5.8   96+ : **  3.7  6.7  0.02" 106.0  OCc 994  ,AkChIW
 6 d  163176* 9.3   98+ : AB  9.5       0.40"  94.0  ARU  18  ,AkChIW
 6 d  163192  7.9   98+ : **  9.1  9.1  0.25"  90.0  OCc 340  ,I

 8 r X180642  8.1   99- : AC  8.7  9.1  4.0"   82.1  STF2826  BCMRST,ChIW
 8 r  164652  9.1   99- : AB  8.7 10.0  0.56"  77.8  HWE  58  CMS,AkW
 9 r   *** Kepler Stars occulted, light curves are desired    CMRST,AkChIW
 9 R    3325  6.9   97- : **  7.5  7.5  0.01" 350.0  HWE  59  ,AkChIW
   ***   3325 is in the Kepler2 program {ID = 206225297}
10 r   *** Kepler Stars occulted, light curves are desired    BCRST,AkChIW
10 r  146777  9.2   91- : AB  9.3 11.2  0.77"  71.7  HDS3357  BCMST,AkChIW
11 r  128677  8.4   85- : **  9.1  9.1  0.10"  84.0  OCc 594  ,Ak
11 R      55  6.4   84- : AB  6.47 8.91 0.40" 281.1  HDS  61  ,AkChI
11 R      61  7.8   83- : **  8.5  8.5  0.05" 350.0  OCc1141  BCMRST
12 r   *** Kepler Stars occulted, light curves are desired    CS,AkChIW
13 r     298  7.1   67- : **  8.0  8.0  0.10"  90.0  OCc1172  ,Ch
13 r     303  6.4   66- : **  7.2  7.4  0.40" 115.0  OCc1174  B,AkChIW
13 r  110398  9.3   64- : **  9.1 10.1  0.20" 277.0  OCc1179  ,ChIW
14 r X  3974  9.1   55- : AB  9.8 11.2  8.9"   11.9  PLQ  38  ,Ak
14 R   93301  7.2   53- : **  7.9  7.9  0.10" 263.0  OCc 575  BCMRST,I
14 R     464* 6.1   52- : AB  6.1       0.50"  23.0  CHR   8  CM
15 r   93704  8.9   43- : **  9.7  9.7  0.06" 241.0  OCc1033  ,AkChIW
15 r X  5224  9.5   42- : **  9.9 10.6  0.48" 101.4  OCc 617  ,AkChW
15 r   *** Kepler Stars occulted, light curves are desired    BRST,AkChW
16 R   94294  7.6   30- : **  8.7  8.7  0.10"  90.0  OCc  27  BCRST
16 R     764#?4.9   30- : AB  5.8  5.8  0.10"   2.0  A  3010° BCMRST
17 r X  8302  9.0   20- : AB  9.5 10.4  1.27" 193.3  A   105  CMS,I
17 R     913# 5.1   20- : AB  5.1  6.1  0.06"  62.6  MCA  24° B,AkChIW
17 R     915  4.6   20- : **  5.5  6.3  0.02" 178.0  OCc 396  ,AkChIW
17 r   *** Kepler Stars occulted, light curves are desired    BCMST
18 r X 97591 10.6   12- : AB 11.4 11.6  5.2"  157.9  HO   29  ,Ak
18 r   96610# 8.1   11- : AB  8.2 10.1  0.52"  60.8  COU 925  CMRS
19 r   *** Kepler Stars occulted, light curves are desired    BCRST

24 d   *** Kepler Stars occulted, light curves are desired    BCMRST,ChIW
24 D  119305  8.9v   8+ : AB  8.9 12.5  1.93" 176.0  A  2487  BR
   *** 119305 is in the Kepler2 program {ID = 201578486}
25 d X 35802 10.0   14+ : AB 10.6 10.7  0.50" 308.0  TDS8701  BCMRST,I
26 d   *** Kepler Stars occulted, light curves are desired    BCMST,AkChIW
26 d  139656  9.8   22+ : **  9.9  9.9  0.10" 118.0  OCc 643  ,I
   *** 139656 is in the Kepler2 program {ID = 212770303}
26 d  139661  9.4   23+ : AB  9.1 12.0  4.2"  249.1  RST4521  BCMST,I
26 d  139678  8.6   23+ : **  8.8  8.8  0.10"  90.0  OCc  35  CMST
27 d    2113# 7.6   32+ : AB  7.92 9.21 0.42" 310.6  HU  141°  BRT
27 d  158854  8.9   32+ : AB  9.30 9.84 0.40" 229.9  RST3938  M
28 D X 39610  7.7   40+ : AB  7.9 10.1  3.2"   35.6  BU   33  ,ChI
     X 39610,  B star is X132801
28 d  159415# 8.2   42+ : AB  8.78 9.09 0.03"  99.4  HDS2210  BCMRST
29 d   *** Kepler Stars occulted, light curves are desired    BCMRST,ChIW
29 d    2365  7.3   51+ : AB  7.60 8.78 0.27"  51.3  RST3950° BCMRST,AkChI
30 d   *** Kepler Stars occulted, light curves are desired    CMRST,AkChIW
30 d  160325# 9.1   59+ : AB 10.01 9.67 0.40"  94.8  HU  168  BCST,Ak
   *** 160325 is in the Kepler2 program {ID = 230899515}
30 d  160341 10.1   60+ : AB 10.7 10.9  0.40" 102.0  TDT 256  BRT
30 d X 42110# 9.7   60+ : AB  9.6  9.7  1.2"  292.0  WHC  14  BCMRST
                        : AC  9.6 10.6 10.3"  227.3  HJ 4932  BCMRST
   *** X 42110 is in the Kepler2 program {ID = 234634096}
   *** X 42110, B star is X140969
30 d  160421# 8.6   61+ : AB  8.9 10.0  1.00"  53.8  STN  33  BCMRST,ChI
   *** 160421 is in the Kepler2 program {ID = 233404113}
30 D    2495# 6.0   61+ : AB  6.34 7.56 2.42" 263.5  BU  126  CS,ChI
                        : AC  6.3 11.2 12.1"  137.5  BU  126  CS,ChI
   ***   2495 is in the Kepler2 program {ID = 233441374}
   ***   2495, B star is X141441
31 d   *** Kepler Stars occulted, light curves are desired    BCMRST,Ch
31 D  160980  7.9   69+ : **  8.4  8.4  0.05"  60.0  OCc1522  BT
31 D    2596  7.5   69+ : **            0.05" 163.0  OCc1523  BCMST,Ak
   ***  2596 is in the Kepler2 program {ID = 227049676}
31 d  161033  9.6   69+ : Aab 9.8  9.8  0.40"  87.0  OCc 537  BRST
                        : AB  9.7 11.5  9.7"  284.3  B  2431  BRST
31 d  161034  9.1   69+ : AB 9.1  11.7  8.4"   70.3  ARA 450  ,ChI
31 d  161043  9.1   69+ : **  9.9  9.9  0.10"  53.0  OCc 536  BCMRST,Ak
31 d X 43398  7.4V  70+ : **  8.8  8.8  0.05" 350.0  OCc1528  ,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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