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


The list shows occultations of possible double stars during April. 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 April 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
Apr      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 2 R  163793  7.8   28- : AB  7.8 11.0  2.9"  226.7  HO  135  BRS,Ak
 3 r X 50587  8.9   18- : AB  9.2 11.0  2.2"   88.4  I   302  ACHMS,ChIW
     X 50587:  B star is X180065
 3 R  164576  8.6   18- : **  9.2  9.2  0.10"  40.0  OCc 826  ACHMS
 4 R  *** Kepler Stars occulted, light curves are desired     A,AkChIW

10 d  *** Kepler Stars occulted, light curves are desired     ABCHMPRS,AkChIW
10 d X  5224  9.5   12+ : **  9.9 10.6  0.48" 101.4  OCc 617  R
11 d   94294  7.6   21+ : **  8.7  8.7  0.10"  90.0  OCc  27  AMP
12 d X 79854*10.2   30+ : AB 10.9 10.9  0.50" 211.0  TDS3426  ,AkW
12 d X 80848 10.2   30+ : AB 10.2 11.9  1.8"  181.0  TDS 211  BR
12 d   95001* 8.1   30+ : **  9.1  9.1  0.10"  90.0  OCc  28  ,I
12 D   95127  7.2   31+ : **  8.4  8.4  0.02"   0.0  OCc 450  ABCHMRS,ChI
12 d   95183  9.2   31+ : AB  9.3 11.3  0.51"  66.4  A  2443  P
12 d  *** Kepler Stars occulted, light curves are desired     P    
13 d  *** Kepler Stars occulted, light curves are desired     BCHMRS,AkChIW
13 d X 96107  9.5   41+ : AB  9.9 10.6  0.30" 173.2  A  2460  ACHMS
   *** X 96107 is a Kepler K2 star  {ID = 202059433}
13 D   96277* 7.6   41+ : AB 12.0 12.5  3.2"  138.5  COU 769  ,AkW
13 d   96343# 8.7   42+ : AB  9.0  9.9  0.59" 270.4  BU  899  ABCHMS,ChIW
   *** 96343 is a Kepler K2 star  {ID = 202059435}
13 d   96427* 8.3   42+ : **  9.0  9.0  0.05" 115.0  OCc 378  ABCHMPRS
13 d   96573  8.2   43+ : **  9.4  9.4  0.10"  90.0  OCc1344  P 
14 d   97296# 8.3   51+ : AB  8.63 9.64 0.25"  55.6  HDS1114  ,AkChIW
14 d   97483  8.5   53+ : **  8.0  8.8  0.10" 350.0  OCc 339  AP
14 D    1198  6.1   53+ : **  7.0  7.0  0.20" 130.0  OCc 352  R
14 d X 12071  9.8   53+ : **  8.8  8.0  0.10" 170.0  OCc 339, P
                        : BA  9.9  8.5  10.6" 232.1  STF1173  P
14 d    1210  6.0   54+ : **  6.7  6.7  0.05" 350.0  OCc1378  R
15 d   98093  9.4   62+ : AB 10.1 10.1  0.57" 280.3  HU 1251  ,ChIW
15 d   98217  9.1   64+ : AB  8.9 11.5  3.5"  202.8  HEI 148  AP
15 d  *** Kepler Stars occulted, light curves are desired     BHS,AkChIW
15 d   98225  8.6   64+ : AB  8.8 10.6  0.20"  48.0  HDS1288  P
15 d   98270  8.1   65+ : AB  8.64 9.19 0.18"  24.1  HU  861  P
16 d X 14553# 9.5   72+ : AB  9.6 10.3  2.4"  348.3  HJ  165  BR,Ak
16 D    1441  6.4   74+ : AB  6.4  6.9  0.03" 129.7  MCA  34  P
16 d   98794  7.6   74+ : AB  6.0  8.5  0.8"  124.0  TOK  24  P
17 D  118292  7.7   80+ : AB  7.8  9.1  3.6"   74.2  STF1431  ABCMRS,AkChIW
      118292:  B star is X118221
17 d  118378  8.2   82+ : **  9.3  9.3  0.10"  90.0  OCc 178  AHMP
18 d  *** Kepler Stars occulted, light curves are desired     ABCHMPRS,AkChIW
18 D    1658  6.4   89+ : **  7.2  7.2  0.05" 350.0  OCc1426  P 
19 d    1732  6.8   93+ : **  7.6  7.6  0.10" 129.0  OCc 708  ACHM,I
19 d  119205  9.4   94+ : AB 10.3 10.05 0.20"  36.8  RST5363  ABCHMRS
20 D    1849  6.1   98+ : AB  6.1       0.50" 132.7  CHR  38  BR
20 D    1866  5.8   98+ : Aab 5.9  8.3  0.10"  35.4  CHR  39  P
21 d  *** Kepler Stars occulted, light curves are desired     ABCHMPRS,AkChIW

23 r  159140  8.0   98- : **  8.8  8.8  0.36" 324.0  OCc1019  CHMPS
23 r    2184  7.3   98- : AB  7.0       0.20" 153.8  CHR  44  HM
24 R    2279  6.1   95- : **  7.0  7.0  0.10"  90.0  OCc1485  ACHMPS,ChIW
26 r  160678# 7.6   83- : Aab 8.2  8.8  0.10"  96.0  YSC 158  ABCMRS,AkChIW
                        : AB  7.7 10.1  0.73"  91.7  HDS2485  ABCMRS,AkChIW
26 r  160686# 9.3   83- : AB  9.5 11.3  0.30" 139.0  HDS2486  B,AkChW
26 r X 42732  9.8   83- : AB  9.8 10.5  2.0"  271.1  HLD 138  ABCHMR,AkChIW
26 r  160757* 9.4   83- : ** 10.1 10.1  0.10"  90.0  OCc 535  ABCHMPS,AkChIW
26 R    2555? 7.5   82- : AB  7.6 10.3  1.00" 310.6  HU  186  ACHMPS
        2555:  B star is X144366
28 R    2830  7.1   66- : AB  6.9 13.0  5.0"  203.5  RST3223  ABCHMRS,AkIChW
28 r  162611  8.6   65- : **  9.6  9.9  0.15" 228.0  OCc 475  ABCHMRS,AkIChW
28 r  162728  7.9   64- : AB  9.0  9.3  0.33" 274.2  HLD 152  CHMS,I
28 r  *** Kepler Stars occulted, light curves are desired     ABCMPRS,AkCh
28 R    2871  7.3   63- : AB  7.2  7.4  9.9"  236.1  S   722  P
        2871:  B star is R  2870   
29 r  163371  8.6   56- : **  9.5 10.0  0.36" 252.0  OCc 407  ,ChIW
29 r  163551  8.4   54- : **  9.8  9.8  0.10"  89.0  OCc 920  H,I
29 r  163562  9.7   54- : AB  9.8 13.0  1.6"  348.4  RST4064  ABCRS
29 r  163563* 9.0   54- : **  9.6 10.2  0.09" 190.5  OCc 402  ,I
29 r  163569  9.2   54- : AB 10.0 10.0  0.31"  56.7  RST4065  ABCHMPRS,I
29 R    2995# 6.1   53- : AB  6.8  7.0  0.13" 142.0  FIN 336  P
30 r X 49950  9.5   44- : **  9.8  9.8  0.05"   5.0  OCc 973  ,AkChIW
30 r  164225  9.4   44- : **  9.6  9.6  0.20"  26.0  OCc 974  ,AkChIW
30 r  164233  9.0   44- : **  9.7  9.7  0.10"  90.0  OCc1600  H,AkChIW
30 r  164328  9.4   43- : **  9.4 11.5  1.1"  271.9  OCc1603  ABCHMPRS

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

Visibility codes:
Australia: A Adelaide, B Brisbane, C Canberra, H Hobart, M Melbourne, P Perth, 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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