The list shows occultations of possible double stars during August. 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 August 2019 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 brian.loader@slingshot.co.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.

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 d P    Star  Mag    %         Double details        WDS or   Area of
Aug      No    v    ill      magnitudes sepn    PA°  OCC #    Visibility
 3 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 3 D    1598  6.5    7+ : **  7.2  7.2  0.10"  90.0  OCc  85  M
   ***   1598 is in the Kepler2 program {ID = 248842300}
 4 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 5 d   *** Kepler Stars occulted, light curves are desired    ,AkWChI
 5 d X124659 10.9   23+ : AB 10.8 11.2  1.6"  170.9  HEI 770  ,Ch
   *** X124659 is in the Kepler2 program {ID = 229127900}
 6 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,WCh
 6 d  139499 10.0   35+ : AB 10.1 11.3 13.3"    5.6  HJ 1239  R
   *** 139499 is in the Kepler2 program {ID = 212808250}
 6 d  139562  9.4   36+ : AB  9.8 10.5  1.10" 174.8  A    13  TSCM
 8 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 8 d X 39530  9.9   57+ : AB  9.9 11.6  0.9"  248.7  HU  310  R
 8 D    2223* 3.9   58+ : Aab 4.0  4.2  0.10" 191.0  WRH  20  RBTSCM,AkWChI
 9 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 9 d X 41033  9.1   68+ : AB 11.0 11.0  0.8"  226.8  HLD 130  RBT
   *** X 41033 is in the Kepler2 program {ID = 205278648}
10 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
10 d  185258* 8.6   77+ : AB 11.4 11.9  6.7"   73.0  ARA1124  RBTSCM,AkWCh
   *** 185258 is in the Kepler2 program {ID = 234201903}
10 d  185323  9.1   78+ : AB  9.5  9.9  0.9"    6.7  SEE 326  RBTSCM
   *** 185323 is in the Kepler2 program {ID = 234151618}
11 d  186384  9.1   85+ : AB  9.7 10.0  0.35" 135.1  RST3158  RBTS,Ak
11 d  186363  9.0   85+ : AB  9.58 9.92 0.17" 106.1  RST3157° R
11 d  186482# 9.1   85+ : AB  9.2 10.3  1.5"  164.5  I   631  SCM,AkWChI
12 D   Titan  8.5   91+                                       RBTSC,Ak
12 D  Saturn  0.2   91+                                       RBTSC,Ak
12 d X 45324  8.6   91+ : AB  8.6 10.6  4.4"  145.2  I   641  R
12 d   *** Kepler Stars occulted, light curves are desired    RBTSM,AkWChI
12 d  187806  8.0   92+ : AB  8.0 11.7  7.5"  330.0           BTSCM,AkWChI
12 D    2802* 6.4   92+ : **  7.2  7.2  0.05" 350.0  OCc1572  ,AkWChI
13 D    2929  7.1   96+ : **  7.9  7.9  0.10"  90.0  OCc1591  RBTSCM

15 D    3171# 3.7  100- : AB  4.6  4.6  0.01" 248.0  SEE 371  SCM,AkWChI
15 R    3171# 3.7  100- : AB  4.6  4.6  0.01" 248.0  SEE 371  SCM,AkWChI

16 r   *** Kepler Stars occulted, light curves are desired    R,AkWChI
17 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
17 r  146587  7.6   96- : **  8.9  8.9  0.10"  90.0  OCC  60  RBTSC
17 R    3425* 4.4   96- : **  5.4  5.4  0.10"  90.0  OCc1639  RBTSCM,Ak
17 R    3446  7.2   95- : **  7.9  7.9  0.05"  34.0  OCc1091  RBTSCM
                        : AB  7.2  7.7  6.9"  146.3  STF3008  RBTSCM
   ***   3446 is in the Kepler2 program {ID = 246040978}
         3446:  B star is X185486
19 R   *** Kepler Stars occulted, light curves are desired    RBTSCM,Ak
23 R   *** Kepler Stars occulted, light curves are desired    BTSC
23 r   93702! 8.9   49- : **  9.1 10.8  0.04"  84.0  OCc1864  RBS
   ***  93702 is in the Kepler2 program {ID = 210595704}
23 R     600  6.6   48- : AB  6.7  9.6  0.49" 108.5  MCA   4  R
24 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,Ak
25 R   77614  8.1   28-  :**  9.0  9.0  0.05" 350.0  OCc 322  ,WChI
25 r X 79200 10.3   28- : AB 11.0 11.2  0.70"  91.0  TDS3395  BT
25 R   77614  8.1S  28- : **  9.0  9.0  0.05" 350.0  OCc 322  ,WChI 
26 r   78851  8.8   18- : **  9.7  9.7  0.10" 329.0  OCc 819  RBTSC
26 r X 94263  9.9   18- : AB  9.5 11.3  9.8"   38.0  POU2072  ,AkWChI
27 r X 11970 10.7   10- : AB 11.4 11.5  0.60"  74.0  TDS5395  B

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Visibility codes:
Australia: R Rockhampton, B Brisbane, T Tamworth, S Sydney, C Canberra, M Melbourne  

NZ (following a ,) Ak Auckland, W Wellington, Ch Christchurch, I Invercargill.
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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 WDS number followed by a ° sign indicates the 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 brian.loader@slingshot.co.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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