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Lunar Occultations of Close Double and Kepler2 Stars in April 2015 for Australia and NZ


The list shows possible double stars, with separations less than 2", predicted to be occulted by the Moon during April 2015 and visible from parts of Australia or New Zealand. 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.

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 are also included in the list. Light curves for the occultation of these stars are also required. Reporting of these events is still being sorted out, with a system in Occult coming soon. In the meantime please archive any observations of Kepler stars, keeping both the video and the light curve.

The list below is generated by OCCULT for a 25cm telescope. Some of the events may be beyond the reach of smaller telescopes.

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.

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

 d P    Star  Mag    %         Double details        WDS or   Area of
Apr     No    v   ill      magnitudes sepn    PA?    OCC #    Visibility
 1 d    1539  7.3   91+ : **  8.2  8.2  0.10"  90.0  OCc 200  ,AkChIW
 1 D  118410  7.1   92+ : AB  7.69 8.16 1.81" 333.5  STF1457  BR
      118410:  B star is X118941 
 1 D    1549  5.1   92+ : **  6.0  6.0  0.10"  90.0  OCc 197  H
 1 d  118465  8.7   93+ : AB  9.18 9.70 0.33" 149.4  A  2771  AsP
 2 d X 17157  9.5   97+ *** Kepler star, light curve desired  AAsBCMRS
 2 d  118912  8.5   97+ *** Kepler star, light curve desired  P

 6 R    2088  6.2   95- : **  6.2       0.01" 327.8  OCc1466  AAsBCHMPRS,Ch
 8 r  159702  8.1   85- *** Kepler star, light curve desired  ,AkChW
 8 r X 40817  9.7   84- *** Kepler star, light curve desired  BR
 8 r X 40826  9.8   84- *** Kepler star, light curve desired  R
 8 r    2325  9.1   84- *** Kepler star, light curve desired  CHMS,ChIW
 8 r X 40676  9.6   84- *** Kepler star, light curve desired  ,ChI
 8 r  159790  9.9   84- *** Kepler star, light curve desired  ,AkChW
 8 r  159794  8.7   84- *** Kepler star, light curve desired  AAsBCHMRS,AkChIW
 8 r  159842  9.0   84- *** Kepler star, light curve desired  AAsCHMPS,AkChIW
 8 r  159847  9.5   84- *** Kepler star, light curve desired  BR
 8 r  159852  9.1   83- : AB  9.2 10.6  1.2"  320.5  HU  311  ACHMPS,AkChIW
 8 r  159887  8.9   83- : **  9.2 11.2  0.01"  32.9  OCc 576  AsBR
 8 R    2352  7.0   83- : AB  7.6  7.8  0.04" 180.1  CHR  54  AAsCRS
        2352:  *** Kepler star, light curve desired
 9 r    2447  8.0   77- : **  8.2  8.7  0.04" 132.0  OCc1497  ,AkChIW
 9 r X 42110# 9.6   75- : AB  9.6  9.7  1.2"  292.0  WHC  14  AsBR
     X 42110:  B star is X140969 
 9 r  160421# 8.6   74- : AB  8.9 10.03 1.00"  53.6  STN  33  AAsBCMPRS
      160421:  B star is X141119
10 r  161107  9.3   65- : **  9.4 11.0  1.0"   10.0  OCc1529  H,ChI
10 r X152730 10.2   64- : AB 10.7 11.0  0.50"  91.0  TDT 754  AAsC
10 r  161282  8.9   64- : Aab 9.5 10.1  0.40" 130.0  TDT 781  P
11 r  162102# 8.7   55- : **  9.0 10.3  0.05" 254.3  OCc1764  BCHMRS,AkChIW
11 R  162251#?8.1   54- : **  9.2  9.2  0.10"  90.0  OCc1570  AAsBCHMPRS
13 R  164080* 7.1   32- : **  8.1  8.1  0.10" 107.0  OCc 914  AsR
13 r  164159  9.3   31- : AB  9.4  9.7  0.7"  299.2  HO  149  AsP
      164519:  B star is X177970 
14 r X 51201 10.2   21- *** Kepler star, light curve desired  ,I
14 r X 51302 10.2   21- *** Kepler star, light curve desired  AsR
14 r X181439 11.0   21- *** Kepler star, light curve desired  BCRS
14 r X181497 11.1   21- *** Kepler star, light curve desired  CMS
14 r X181577 10.6   21- *** Kepler star, light curve desired  As
14 r X181578 10.8   21- *** Kepler star, light curve desired  As
14 r X181590#11.1   21- : AB 11.3 11.5  1.8"  147.5  RTS4704  A
14 r X181734 10.9   20- *** Kepler star, light curve desired  P 
14 r X 51405 10.3   20- *** Kepler star, light curve desired  P 
14 r X 51424 10.7   20- *** Kepler star, light curve desired  P 
14 r  145886  9.6   20- *** Kepler star, light curve desired  P 
16 r X186865 10.6    5- : AB 11.3 11.4  0.50"  92.0  TDT4264  CHS

21 D X 33570  9.1    8+ : AB  9.5 10.9  0.44" 328.1  HEI  35  ,AkChIW
21 d     610  6.1    8+ : **  7.0  7.0  0.05" 358.0  OCc 491  R
21 d X 69563 10.0    9+ : AB 10.2 13.6  0.53" 263.2  PAT   4  P
21 D   93860  8.5    9+ : **  8.9 11.0  0.06" 244.0  OCc 938  P
22 R     764* 4.9   15+ : AB  5.8  5.8  0.10"   9.4  A  3010  R,AkChIW
22 d X  6679 10.1   16+ : AB 10.6 11.2  0.41"  92.7  COU 369  AAsBCRS
22 d X 73159 10.4   16+ : AB 10.6 12.1  1.2"   82.0  TDS3115  AsR
22 d     785* 9.2   16+ : **  9.2 10.1  0.04" 281.1  OCc 486  AAsP
22 D X 73437# 8.3   16+ : Bab 8.5 11.0  0.70" 161.7  COU2580  As
                        : BA  8.3  7.7  2.6"  344.9  STF 670  As
22 d   94430# 9.8   16+ : AB  9.8 11.3  1.0"  136.2  A  2430  As
22 d X 73471 10.1   16+ : AB 10.1 10.4  1.9"  231.5  COU  38  As
23 d   95183  9.2   24+ : AB  9.3 11.3  0.51"  66.3  A  2443  ,ChI
23 d X 82616  9.5   24+ *** Kepler star, light curve desired  ,ChI 
23 d X 82862  9.6   24+ *** Kepler star, light curve desired  CS,ChIW 
23 d X 82950  9.6   24+ *** Kepler star, light curve desired  CS,ChI
23 d   95229  8.6   24+ : AB  9.0  9.7  0.08" 181.2  A  2444  R
23 D   95252  8.1   24+ : AB  8.33 9.78 0.29" 157.9  COU 471  BHMRS,AkChIW
23 d   95265  8.9   24+ : **  9.6  9.7  0.02" 235.6  OCc 487  ABCRS
23 d X 83080 10.2   24+ *** Kepler star, light curve desired  BR
23 d X 83627 10.5   25+ *** Kepler star, light curve desired  AsBR
23 d X  8433 10.7   24+ *** Kepler star, light curve desired  R
23 d X 83933 10.6   25+ *** Kepler star, light curve desired  AAs
23 d X 84242 10.7   25+ *** Kepler star, light curve desired  As
23 d X 84301 10.0   25+ *** Kepler star, light curve desired  As
23 d   95403* 9.2   25+ : **  9.9  9.9  0.10" 141.0  OCc 441  As
23 d X 84735  9.7   25+ *** Kepler star, light curve desired  AP
23 D   95390  7.4   25+ : **  8.3  8.3  0.05"  13.0  OCc 927  P
23 d X 84862 10.2   25+ *** Kepler star, light curve desired  P
23 d X 84914 10.7   25+ *** Kepler star, light curve desired  P
23 d X 84930  9.5   25+ : AB  9.6 11.2  2.7"  134.9           P
     X 84930:  *** Kepler star, light curve desired  
23 d X 84958 10.4   25+ *** Kepler star, light curve desired  P 
24 D    1072* 6.0   34+ : **  7.0  7.0  0.03" 197.0  OCc 411  BR,AkW
24 d    1083# 7.6   35+ : AB  7.71 9.45 0.30"  57.0  HDS 992  AAsP
25 d   97323! 9.3   43+ : ** 10.0  10.1 0.24" 273.0  OCc1751  ,AkChIW
25 D    1190* 7.2   44+ : **  7.9  7.9  0.03" 158.0  OCc 379  R
25 d   97376* 9.0   44+ : **  9.5  9.5  0.08" 281.0  OCc 381  AsBCRS
25 d   97457  8.7   45+ : **  9.3  9.3  0.05" 350.0  OCc1377  AsR
27 D    1428* 3.5   65+ : Aab 3.5      0.004" 193.7  HMM   1  As
                        : Aac 3.5       0.60" 268.0  ARI   1  As
28 d    1505* 8.8   71+ : **  9.7  9.7  0.10"  90.0  OCc   7  ,ChIW
28 d  118208  9.6   72+ : AB 10.4 10.6  0.30" 391.7  A  2765  BS,ChIW
29 d X 16891  9.7   82+ *** Kepler star, light curve desired  P
30 d  119062  9.1   87+ *** Kepler star, light curve desired  BCHS,AkChIW     
30 d  138479  8.4   88+ : **  9.2  9.2  0.05" 350.0  OCc1430  R

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

Visibility codes:
Australia: A Adelaide, As Alice Springs, 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

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

Visibility codes:
Australia: A Adelaide, As Alice Springs, 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 new version of 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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