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 2018 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
July
 2 r  164808  7.7   84- : AB  7.7 11.0  0.20"  28.8  TOK 215  ,Ak
 2 r  164809# 7.6   84- : AB  7.7 10.2  0.31"  55.4  HU  282  ,AkWChI
 2 R    3237  4.3   83- : **  5.2  5.2  0.05" 350.0  OCc1616  RBTS
 2 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 2 r    3261  8.9   82- : AB  8.9 12.1  0.8"  296.0  YSC  75  TSCM
   ***  3261 is in the Kepler2 program {ID = 206064678}
 3 r  165355  9.2   75- : **  9.7  9.7  0.10"  99.0  OCc1631  RBT
 3 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 6 R     178  6.6   47- : AB  6.5  9.5  1.3"  133.0  STT  27  ,AkWChI
   ***    178 is in the Kepler2 program {ID = 220292272}
 6 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 6 r  109813  9.6   45- : AB 10.0 10.9  0.11" 276.3  A  2313  RBTS
 7 R     303  6.4   36- : **  7.2  7.4  0.40" 115.0  OCc1174  ,WChI
 7 r  110367  9.0   35- : AB  9.2 11.1  0.20" 172.0  HDS 287  R
 8 r   93236  9.5   25- : **  9.8  9.8  0.10"  52.0  OCc 625  R
 8 r X  3974  9.1   25- : AB  9.8 11.2  8.9"   11.9  PLQ  38  RBTS,AkW
 9 r   93704  8.9   15- : **  9.7  9.7  0.06" 241.0  OCc1033  RBT
 9 r   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 9 r X  5224  9.5   15- : **  9.9 10.6  0.48" 101.4  OCc 617  RBTSC
10 r   *** Kepler Stars occulted, light curves are desired    ,AkWCh
10 r     744  9.5    8- : AB  9.7 11.5  0.47" 240.5  OCU 709  ,AkWCh
   ***    744 is in the Kepler2 program {ID = 247133947}
10 r   94282  9.3    7- : AB  9.5  9.5  0.20" 278.0  A  2428  TSCM
                        : AC  9.4 12.0  3.4"  293.0  A  2428  TSCM

16 d X 34278 10.8   14+ : AB 10.8 11.6  7.9"  287.2  HJ  166  ,AkWCh
16 d X 16063 10.3   14+ : **  9.6 10.5  0.02" 279.0  OCc1078  B,AkWChI
   *** X 16063 is in the Kepler2 program {ID = 248842419}
16 d   99271  9.8   14+ : ** 11.0 11.0  0.05" 222.0  OCc1080  RBTSCM
                        : ** 11.0 11.0  0.17" 222.0  OCc1079  RBTSCM
16 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
17 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
18 d   *** Kepler Stars occulted, light curves are desired    ,AkWChI
18 d X124037  9.7   33+ : AB  9.8  9.9  1.3"  284.0  AG  178  ,AkWChI
     X124037:  B star is X 18525 
   *** X124037 is in the Kepler2 program {ID = 229154176}
19 d   *** Kepler Stars occulted, light curves are desired    B,AkWCIh
21 D    2137  6.6   65+ : **  7.2  7.2  0.05" 350.0  OCc1469  ,WCh
22 d   *** Kepler Stars occulted, light curves are desired    ,AkWChI
23 d  160088  9.7   83+ : AB 10.1 11.3  0.14" 332.9  HU  313  TSCM,AkWChI
23 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
24 d  160595  9.3   89+ : AB  9.3 10.7  2.2"   75.6  HU 1180  ,Ak
24 d X 42570  9.0   90+ : AB  9.0 12.5  2.6"  147.0  B  1864  RB
   *** X 42570 is in the Kepler2 program {ID = 226728233}
24 d  160645  8.7   90+ : AB  9.0  9.0  0.09"  86.5  B  1863  M,ChI
                        : AC  8.7 12.0  0.20" 134.0  TOK 418  M,ChI
24 d  185642* 8.3   91+ : **  8.7  8.7  0.10"  90.0  OCc  37  R
25 D    2666  4.9   95+ : AB  5.03 7.43 1.69" 278.9  JC    6  RBTSCM,AkWCh
        2666:  B star is  X156529
25 d  187040* 7.5   96+ : AB  7.5 10.6  1.33" 166.4  HO  567  RBTSCM,AkWChI
27   Eventa during lunar eclipse
27 D X173974 11.3   56E : AB 10.6 10.9  5.1"  197.9  DON1119  RBTSCM
27 D X174015  9.1   19E : AB  9.1  9.4  2.3"  117.1  B   479  RBTSCM,WChI
     X174015:  B star is X 48198
27 R X173974 11.3    0E : AB 10.6 10.9  5.1"  197.9  DON1119  RBTSCM

28 r  163998  8.9  100- : **  9.3 10.0  0.21" 310.0  OCc 351  ,W
28 R    3071  6.1  100- : **  6.8  8.2  0.43"  77.0  OCc 607  RBTSCM,AkW
29 R    3181* 6.0   98- : **  6.7  6.7  0.05" 350.0  OCc1610  ,WChI
                        : AB  5.4  9.5  4.3"  229.0  DRS  68  ,WChI
29 r    3207  8.2   97- : AB  8.2 11.4  1.45"  32.0  RST4092  M,AkWChI
29 r  164809# 7.6   97- : AB  7.6 10.2  0.31"  55.5  HU  282  SCM
31 D   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI

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

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

[Top of Page][Return to Home Page]