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


The list shows occultations of possible double stars during October. 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 July 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
Oct      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 r  *** Kepler Stars occulted, light curves are desired     ABCHMPRS,AkChIW
 1 r     523  6.4   83- : **  7.3 7.3         350.0  OCc1208  CBRS,AkChIW
      ***    523 is a Kepler2 star {ID = 210501067}
 1 R     581  6.8   81- :  AB 6.9 11.1  3.0"  262.2  HEI  31  P
 2 r   94064  8.7   73- : **  8.9 10.7  0.03" 128.0  OCc1241  ,ChIW
 2 r   94117  9.6   72- : Aab 7.4  9.1  0.30" 273.0  PAT  15  BR
 2 r   94120  8.5   72- : AB  6.9 10.8  0.08" 281.0  PAT  17  ABCHMS
 2 r   94132  8.1   72- : AB  8.1 10.0  9.3"  318.0  STF 598  P
 3 r   94796  8.8   62- : AB  8.8 12.1  0.9"  110.2  A  2435  ABR
 3 R   94840  7.7   61- : AB  7.7 10.9  3.9"   20.0  A  2437  AMP
                          AC  7.7 12.5  9.3"  235.0  A  2437  AMP
 3 r X 78518  9.6   61- : AB 10.3 10.4  0.50" 122.0  TDS3366  P
 4 r  *** Kepler Stars occulted, light curves are desired     AkChW
 5 R    1141* 5.5   41- : AB  5.5       5.6"  225.0  RBR  16  R
 5 r   97009# 8.9   41- : AB  8.9 12.9  2.5"   93.3  A  2872  BR
 5 r   97047# 9.1   40- : AB  9.4 10.7  0.52" 210.2  COU 474  ACHMR
 6 r  *** Kepler Stars occulted, light curves are desired     P
 6 r X109074# 9.6   32- : AB 10.4 10.2  0.38"  33.2  HEI 142  ,AkChIW
 8 r X 15029  9.8   16- : AB  9.9 11.2  4.9"  326.0  BRT1265  ,AkW
 8 D   Venus -4.7   15- : Gradual disappearance, sunlit limb  ABCHMRS,AkChIW 
 8 R   Venus -4.7   15- : Gradual reappearance, sun up        ABCHMRS,AkChIW

18 D  160678  7.6   25+ : Aab 8.2  8.8  0.10"  96.0  YSC 158  BCHMRS
                        : AB  7.7 10.1  0.72"  91.5  HDS2485  BCHMRS
      160678:  Graze at Auckland
18 d  160686  9.3   25+ : AB  9.5 11.3  0.30" 139.0  HDS2486  ABCS
18 d X 42732# 9.8   26+ : AB  9.8 10.5  2.0"  271.1  HLD 138  P
19 d  161481  8.3   34+ : AB 8.37 11.16 1.70" 106.0  HDS2609  ,ChI
20 d  162558  8.8   44+ : AB  8.9 12.6  4.4"  179.6  HU  266  ,AkChIW
20 d X167884 10.4   45+ : AB 10.9 11.2  0.50" 291.0  TDT1448  R
20 d X 54074  8.2   46+ : AB  9.0  9.1  4.1"  149.9  HJ 2880  ABCHMPRS
     X 54074:  B star is X169206
21 D  163440  7.5   55+ : AB 7.59 10.46 1.20" 252.7  RST4057  ,ChIW
21 d  163460* 8.5   55+ : **  9.4 10.3        350.0  OCc 440  B,Ak
21 D    2968# 6.1   55+ : Bab 6.16 9.14 0.47"  61.4  BAR  12  BR
21 D    2969# 3.1   56+ : Aab 3.1  4.9  0.04" 203.7  BLA   7  BRS
21 d X175026  8.9   58+ : AB  9.0 10.5  7.0"  207.0  HO  132  P
22 d  164222# 8.9   66+ : AB  9.7 10.2  0.17" 250.6  VOU  24  ,W
                        : AC  9.7 12.9  2.6"  232.0  RST4077  ,W
23 D  145938  7.2   77+ : AB  7.2 10.3  0.9"  173.6  BU  475  ,AkChIW
23 d  *** Kepler Stars occulted, light curves are desired     HR,AkChIW
23 d  146019  8.9   78+ : AB  9.1 11.2  1.2"  197.5  A  2693  P
      *** 146019 is a Kepler2 star {ID = 206335674}
24 D    3411# 7.2   87+ : AB  7.41 9.20 0.39" 104.7  BU  714  ,ChIW
24 d  146623  8.9   87+ : AB  9.6  9.6  0.10"  16.3  YSC 167  ABPR
26 D  Uranus  5.7   98+ : Gradual disappearance               ,AkChIW

29 r  *** Kepler Stars occulted, light curves are desired     AP      
29 R     648* 3.8   93- : Aac 3.8 12.9        350.0  OCc 255  AP
                        : Aab 3.9  9.5  0.68"   8.4  CHR 262  A
30 R     764* 4.9   87- : AB  5.8  5.8  0.10"  74.0  A  3010  ,AkChIW
30 r X 73437# 8.3   86- : Bab 8.5 11.0  0.70" 161.6  COU2580  ABCRS
30 R     787# 7.1   86- : AB  7.7  8.3  2.7"  164.9  STF 670  ABCMPRS
         787:  B star is X 73437  (see above for Ba,Bb)
30 r X 73658  9.4   86- : AB  9.5 11.5  6.1"  308.8  COU  39  ABCMRS
30 r     800# 7.9   86- : Aab 8.22 9.28 0.26"  22.9  HDS 705  AP
31 r  *** Kepler Stars occulted, light curves are desired     APR      
31 r   95252# 8.1   79- : AB  8.33 9.78 0.29" 157.8  COU 471  ,Ak
31 R     947  5.2   78- : AB  5.2 11.2  7.1"  185.4  HJ 2302  CHMS,AkChIW
31 r X 84930# 9.5   78- : AB  9.6 11.2  2.7"  134.9  J    19  BR,AkW  
      *** X 84930 is a Kepler2 star {ID = 202061204}
31 r X 85235  9.5   78- : AB  9.5 12.1  7.1"  193.7  CXT   2  BCRS,Ak
      *** X 85235 is a Kepler2 star {ID = 202062458}
31 R   95475  7.2   78- : AB  7.3 11.6  5.1"  134.6  BU  894  ABCHMPRS
31 r   95557  9.3   77- : AB  9.9 10.2  0.34"  94.7  A  2516  R 
      ***   95557 is a Kepler2 star {ID = 202059348}

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

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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