The list shows occultations of possible double stars during July. 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 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.

********************************************************************************
Jul      No    v    ill      magnitudes sepn    PA?  OCC #    Visibility
 1 d   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
 2 d   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
 2 d  139499 10.0   63+ : AB 10.1 11.3  3.2"    5.3  HJ 1239  BCMST
   *** 139499 is in the Kepler2 program {ID = 212808250}
 2 D    1965  6.5   63+ : **  7.3  7.3  0.05" 350.0  OCc1453  BCRST,AkChIW
   ***  1965 is in the Kepler2 program {ID = 212801410}
 3 d X 38046 10.0   72+ : AB 10.5 11.5  0.8"  194.5  RST3880  BST
 5 d   *** Kepler Stars occulted, light curves are desired    BCMRST
 5 d  159822  7.8   89+ : **  8.6  8.6  0.10"  90.0  OCc  18  BCMRST
 6 d   *** Kepler Stars occulted, light curves are desired    RT
 6 d    2447* 8.0   94+ : **  8.2  8.7  0.04" 132.0  OCc1497  ,AkChIW
 7 d  160795  8.8   97+ : AB  8.9 12.2  2.17" 222.3  A  2250  BCMRST,AkChIW
 8 d    2680* 5.6   99+ : **  6.6  6.6  0.10" 322.0  OCc 988  ,ChI
 8 d X157875  9.1   99+ : Bab 9.1  9.9  1.0"   89.0  BU  966  ,AkChW
 8 d  161721! 8.9  100+ : **  9.0 11.6  0.15"  91.0  OCc1752  BR
 8 D    2715  6.3  100+ : AB  6.7  9.3  0.60"  54.0  V3789Sg  BCMRST
 8 d    2733  6.8  100+ : **  7.2  7.2  0.20"  90.0  OCc 455  BCMRST

 9 r  162753  8.3  100- : AB  8.4 10.1 20.5"  110.8  HJ 5128  CM,AkChIW
   *** 162753 is in the Kepler2 program {ID = 218542513}
10 r    2997# 7.2   98- : AB  7.94 8.04 0.28" 128.0  SEE 512° CMST,I
11 r X 49923  7.4   95- : AB  8.3  8.3  3.3"  326.8  H 1  47° BCMST,AkChIW
     X 49923: B star is X178290, occn may be up to 15 sec earlier
12 r  164820  8.7   89- : AB  8.7  9.1 19.1"  122.4  STF2851  S,AkChIW
   *** 164820 is in the Kepler2 program {ID = 206104238}
12 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
12 r X 51576  9.5v  88- : AB 10.1 10.5  0.68" 100.2  BU 1215  BCMRST
13 r   *** Kepler Stars occulted, light curves are desired    ,ChIW
14 r   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
14 R    3514# 5.9   71- : AB  6.7  6.7  0.07" 140.5  FIN 359° BCMST,I
15 r   *** Kepler Stars occulted, light curves are desired    BCMS
15 r  109400 10.1   61- : AB 10.2 12.5  2.5"   84.3  A  2304  BRST
16 r   *** Kepler Stars occulted, light curves are desired    BCRST,AkChIW
17 R     368  6.2   39- : AB  6.23 9.85 1.49" 143.4  BU  518  R
         368:  B star is X62362  
18 r   93411  8.7   28- : **  9.3  9.3  0.10"   9.0  OCc 626  BCMST,AkChIW
19 R     636# 7.0   19- : AB  7.26 8.62 0.60"   9.9  STT  79° ,Ak
19 R     653* 4.8   18- : **  5.6  5.6  0.04"  53.0  OCc 952  ,ChIW
                        : AC  4.4  9.6  10.8"  82.9  DRS  37  ,ChIW
19 r   93884* 9.2   18- : **  9.8  9.8  0.10" 350.0  OCc 528  B,AkChIW
19 r   *** Kepler Stars occulted, light curves are desired    ,AkChIW
19 R   93901# 8.1   18- : **  8.6  8.6  0.10" 205.0  OCc 527  BCRST
19 R   93913  7.0   18- : **  7.6 10.6  0.18" 108.8  OCc 615  BCMST,ChI
19 R   93914  7.8   18- : AB  6.4  9.1  1.3"  243.3  PAT   6  BCMRST,Ak
19 R   93936  8.1   18- : AB  6.6 11.5  0.40" 192.0  GUE   8  R
   *** 93936 is in the Kepler2 program {ID = 210585085}
19 R   93933  8.0   17- : **  8.7  8.7  0.02"  23.0  OCc 553  BCMRST
19 R   93958  7.8   17- : **  9.0  9.0  0.50" 279.0  OCc 532  M
20 r     800# 7.9   10- : Aab 8.22 9.28 0.27"  20.5  HDS 705  ,AkW
20 r   *** Kepler Stars occulted, light curves are desired    ,AkCh
21 r   78420* 8.0    4- : Bab 8.6  8.9  0.20" 316.2  BU 1192  ,AkChW
                        : **  8.6  8.9  0.20" 246.0  OCc1320  ,AkChW
21 R     995# 4.1    4- : Aab 4.1  5.1  0.10" 124.6  BTZ   1° ,AkChIW

26 D  118545  8.2   10+ : AB  8.2 11.4  2.8"   98.3  A  2772  ,Ak
27 d   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
28 D   *** Kepler Stars occulted, light curves are desired    BCMRST,AkChIW
29 d   *** Kepler Stars occulted, light curves are desired    BCMRST
31 D    2137  6.6   56+ : **  7.2  7.2  0.05" 350.0  OCc1469  ,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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