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 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.

********************************************************************************
 d P    Star  Mag    %         Double details        WDS or   Area of
Jul      No    v    ill      magnitudes sepn    PA°  OCC #    Visibility
 5 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 5 D   98481# 7.9    8+ : AB  8.2  8.3  0.02"  82.2  COU 384  ,AkWChI
   ***  98481 is in the Kepler2 program {ID = 251323145}
 7 D    1638  8.1   26+ : **  9.3  9.3  0.10"  90.0  OCc  83  RBTSCM,AkWChI
10 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
10 d  139656  9.8   60+ : **  9.9  9.9  0.10" 118.0  OCc 643  RBTSCM,Ak
   *** 139656 is in the Kepler2 program {ID = 212770303}
10 d  139661  9.4   60+ : AB  9.1 12.0  4.3"  248.0  RSR4521  RBTSC,Ak
10 d  139678  8.6   61+ : **  8.8  8.8  0.10"  90.0  OCc  35  RBTSCM,AkW
11 D    2113# 7.6   71+ : AB  7.92 9.21 0.42" 311.4  HU  141° RBTSCM,AkWChI
12 d X133538  8.9   80+ : AB  9.6  9.9  5.6"  269.0  HWE  37  BTSCM,AkWChI
       X133538:  B star is X133537D
12 d   *** Kepler Stars occulted, light curves are desired    TSCM,AkWChI
12 d X 39928# 8.3   81+ : AB  8.6 10.0  3.2"  322.5  STF3095  SCM,AkWChI
   *** X 39928 is in the Kepler2 program {ID = 250025164}
        X 39928:  B star is X133823
13 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
14 d    2518#?8.0   94+ : **  7.4  7.6  0.10" 350.0  OCc1098  R,Ak
                        : AB  8.68 8.90 0.11"  39.7  A  2244° R,Ak
   ***   2518 is in the Kepler2 program {ID = 226253039}
14 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
14 d  185548  8.1   94+ : AB  8.7  8.9  0.36" 298.0  HU  751° BTSCM,AkWChI
   *** 185548 is in the Kepler2 program {ID = 226256676}
14 d  185563  9.8   94+ : AB  9.8 11.9  4.7"   47.8  DON 852  M
15 d   *** Kepler Stars occulted, light curves are desired    RBTSCM
16 d    2802  6.4  100+ : **  7.2  7.2  0.05" 350.0  OCc1572  ,AkWChI
16 d    2838  5.6  100+ : **  6.4  6.4  0.10"  90.0  OCc 220  SCM,AkWChI

18 r  164202  9.4   97- : **  9.8  9.8  0.10"  90.0  OCc 171  ,ChI
18 r X 49770  9.6   97- : AB  9.6 11.1  1.8"  343.7  B   516  RB
18 R    3113  5.4V  97- : **  6.1  6.1  0.10"  87.0  OCc1602  BTSCM
19 R    3225  7.2   93- : AB  7.2 10.3  9.1"  270.0  HWE  59  RBTSCM
19 R   *** Kepler Stars occulted, light curves are desired    RBTSCM
20 r  165218  7.8   88- : AB  8.63 8.78 3.05" 279.1  STF2928  ,AkWChU
       165218:  B star is X18331
20 r  165283  8.4   87- : AB  8.3       0.30" 245.0  ARU   5  RBTSCM,Ak
20 r  165322# 9.4   87- : AB 10.0 10.2  0.63" 314.4  BU 1219  ,I
   *** A light curve is desired as  165322 is in the Kepler2 program {ID = 206139498}
20 r   *** Kepler Stars occulted, light curves are desired    TSCM
21 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
21 r  146801  7.9   80- : AB  8.60 8.77 0.50" 133.9  BU  721  TSCM,AkWChI
   *** 146801 is in the Kepler2 program {ID = 246101155}
23 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
23 r  109576  8.9   64- : p  9.3 11.0  0.27" 183.8   STF  80° ,AkWCh
23 r X 32772  9.1   63- : BA  9.5  6.1 16.0"   73.0  STF  84  RBTSCM,Ak
   *** X 32772 is in the Kepler2 program {ID = 220240741}
23 R     150  6.1   63- : AB  6.1  9.5 16.0"  253.0  STF  84  RBTSCM,Ak
    R   150:  B star is X 32772 (above)
23 r  109655  9.1   63- : AB  9.5 10.4  0.32" 304.6  A  2310° RBTSCM,AkWChI
23 r X  1452 10.0   63- : AB 10.9 11.6  1.9"  179.9  DOO  26  ,AkWChI
   *** X  1452 is in the Kepler2 program {ID = 220259962}
23 r  109703  9.2   62- : AB  9.4 11.9  4.39"  38.7  A  2311  M
   *** 109703 is in the Kepler2 program {ID = 220296220}
24 r  110118  9.2   54- : **  9.4  9.4  0.04"   5.0  OCc1166  ,I
24 r  110164  8.5   53- : **  9.0  9.5  1.0"   10.0  OCc1169  SCM,AkWChI
24 r  110169  9.1   53- : AB  9.2 11.8  0.65"  24.0  HDS 250  ,WChI
25 R     393  6.7   42- : **  7.6  7.6  0.10"  90.0  OCc1191  RBTSCM
27 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
27 R     654# 6.0   22- : **  6.8  6.8  0.10"  71.0  OCc 921  SCM
   ***    654 is in the Kepler2 program {ID = 210745602}
27 R   93926  7.7   22- : AB  8.09 8.89 0.25" 202.9  BU 1185° M
   ***  93926 is in the Kepler2 program {ID = 210733938}
28 r   *** Kepler Stars occulted, light curves are desired    RBTSC,Ak
28 r   77111  9.2   14- : **  9.0 11.2  0.12" 304.0  OCc 377  RBTSCM
   ***  77111 is in the Kepler2 program {ID = 247369782}
29 r X199269 10.5    8- : AB 11.5 11.6  9.2"   35.0  POU1191  ,AkW
29 r   78203  9.0    7- : AB  9.1 11.0  0.20"  55.0  HDS 863  ,AkWCh
29 r   78238  8.9    7- : **  9.6  9.6  0.10" 300.0  OCc 733  B
29 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWCh
29 r X199682 10.7    7- : AB  9.8 11.0  8.0"    4.0  OSB   3  TSC

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

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.
----------------------------------------------------------------------
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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