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


The list shows occultations of possible double stars during December. 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 December 2015 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.

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 number of these is increasing, rather than list them all, the nights on which they are occulted are indicated. Individual Keplers are only shown if they are also a known or possible double. Light curves of occultations of all Kepler stars are desired.
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
Dec      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 r   98592  9.1   66- : AB  9.2 12.3  1.6"  150.4  HI  871  BCRS
 2 r  118211  8.5   56- : AB  8.6 11.0  0.30"  93.0  YSC  93  R
 2 R  118232  8.0   55- : **  8.7  8.7  0.04" 137.0  OCc1414  RS
 4 r  *** Kepler Stars occulted, light curves are desired     ABCHMRS,AkChIW
 4 r  119121  9.7   36- : AB 10.5 10.5  0.40"  97.0  TDS8123  P
 6 r  *** Kepler Stars occulted, light curves are desired     PS
 7 r  *** Kepler Stars occulted, light curves are desired     BCHMS,AkChW
 7 R  139725  8.1   13- : AB  8.1 11.0  4.6"  343.7  TOK 160  ,AkW
 7 R    2020  6.5   13- : **  7.4  7.4  0.10"  90.0  OCc1457  ,Ak
    *** 2020 is a Kepler2 star {ID = 212673769}

13 d    2768* 7.8    4+ : **  9.2  9.2  0.10"  90.0  OCc1563  A
    *** 2768 is a Kepler2 star {ID = 219119080}  
13 d  *** Kepler Stars occulted, light curves are desired     AP
15 d  163899  8.8   16+ : AB  9.6  9.6  0.31" 183.7  RST4069  BR,AkChW
16 D    3183  8.8   26+ : **  9.5  9.5  0.10"  90.0  OCc1611  BCRS,AkW
17 d  *** Kepler Stars occulted, light curves are desired     ABCHMRS,AkChIW
19 d  109355  7.7   61+ : **  9.1  9.1  0.10"  90.0  OCc1143  P
20 d  109908  8.0   71+ : Bab 8.1 11.1  0.57"  35.5  YR    7  HM
20 d X  2098  9.6   71+ : AB  9.7 10.5  6.3"  337.0  PLQ  17  P
20 D     226  6.5   72+ : AB  6.5 10.6  4.0"   77.1  STT  31  P
21 d   92923  8.5   81+ : AB  9.48 9.54 2.92" 251.6  STF 261  ABCHMPRS
       92923:  B star is X 62067
21 d   92929  7.9   81+ : **  8.7  10.7 0.02" 191.6  OCc 680  BR
23 d   93860  8.5   95+ : **  8.9 11.0  0.06" 244.0  OCc 938  ABCHMRS,AkChIW
23 D     648* 3.8   95+ : Aab 3.9  9.5  0.68"   8.4  CHR 262  ABCHMPRS,AkChIW
23 d  *** Kepler Stars occulted, light curves are desired     ABCMPRS
23 D     653* 4.8   95+ : **  5.6  5.6  0.04"  53.0  OCc 952  ABCHMPRS,AkChI
23 D     658  4.3   96+ : AB  4.26 7.85 1.82" 340.3  KUI  17  H
23 D   93963* 6.9   96+ : **  7.7  7.7  0.03" 337.0  OCc1036  P
23 d   93967# 7.8   96+ : AB  9.37 8.09 0.06" 229.3  COU 567  P
23 d   93964*?9.0   96+ : **  9.9  9.9  0.40" 108.0  OCc 483  P
24 d     787# 7.1   99+ : AB  7.7  8.3  2.7"  164.9  STF 670  R
24 d X 73658  9.4   99+ : AB  9.5 11.5  6.1"  308.8  COU  39  BRS
24 d     800# 7.9   99+ : Aab 8.22 9.28 0.26"  22.7  HDS 705  ABCHMPR,AkChIW

26 r   96620# 8.9   99- : AB  9.5  9.7  0.41" 215.0  AG  331  ,AkChW
26 r   96794* 8.0   98- : **  8.9  8.9  0.05" 350.0  OCc 373  R
26 r   96849  9.0   98- : **  9.8  9.8  0.10" 110.0  OCc1359  AP
27 r  *** Kepler Stars occulted, light curves are desired     ABCHMPRS,AkChIW
27 R    1238  6.0   95- : **  6.9  6.9  0.01" 350.0  OCc 311  ABCHMPRS,AkChIW
    *** 1238 is a Kepler2 star {ID = 211743326}
28 r  *** Kepler Stars occulted, light curves are desired     ABCHMRS,AkChIW
28 R   98380# 7.3   89- : **  7.5  9.2  0.014" 52.0  OCc1686  ABCHMPS,Ak
28 r   98395  8.5   89- : AB  8.6 11.8  2.30" 181.7  HU  867  R
29 r   98852  8.5   82- : AC  8.8 11.1  3.8"  276.0  STF1396  ABCMRS,AkChW
                        : AB  8.8 10.4  4.02" 130.0  STF1396  ABCMRS,AkChW
29 r   98879  9.3   82- : **  9.7  9.7  0.10" 137.0  OCc 783  BR
30 r  118476  8.2   74- : **  8.9  8.9  0.10"  90.0  OCc1419  BR
30 r X 16210  8.8   73- : 88  8.8  9.9  4.3"   77.5  OCc1421  ABCHMPRS
     X 16210:  B star is X 16211
30 r  118517  8.6   73- : **  8.9  9.5  0.06" 303.0  OCc1422  ABCHMRS
31 R  118942  7.2   64- : AB  7.2 12.9  3.9"   84.6  A  2777  ACMS
31 r    1658  6.4   66- : **  7.2  7.2  0.05" 350.0  OCc1426  ,Ak
31 r  *** Kepler Stars occulted, light curves are desired     ,Ak

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

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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