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 October 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
Oct      No    v    ill      magnitudes sepn    PA°  OCC #    Visibility
 1 D  158781  8.7    9+ : **  9.5  9.5  0.05"  12.0  OCc 623  ,AkW
 2 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,I
 3 d   *** Kepler Stars occulted, light curves are desired    SCM,AkWChI
 3 d  160111  9.6   28+ : AB  9.5  9.7 13.6"  220.7  HJ 4888  CM
   *** 160111 is in the Kepler2 program {ID = 205058836}
 4 d   *** Kepler Stars occulted, light curves are desired    RBTSC,AkWChI
 4 d X 42647d10.1   36+ : AB 10.2 12.1  2.5"  185.5  B  1865  RBTSCM,AkWChI
 4 D    2535* 6.3   36+ : AB  6.6  8.0  0.10"  61.1  HDS2492  R
 4 D    2547* 4.9   37+ : **  5.1  6.9  0.02" 172.0  OCc 401  RBTSCM
 5 d  186883  8.9   46+ : AB  9.6  9.6  0.50" 208.7  RST3183  ,Ak
 5 d   *** Kepler Stars occulted, light curves are desired    RBCM,WChI
 5 d    2716  7.7   48+ : AB  7.8 11.2  1.47"  37.9  I  1381  RBTSCM
   ***   2716 is in the Kepler2 program {ID = 216403157}
 6 d   *** Kepler Stars occulted, light curves are desired    S,AkWCh
 8 D    3113* 5.4   76+ : **  6.1  6.1  0.10"  87.0  OCc1602  RBTSCM,AkWChI
 9 D    3225  7.2   83+ : AB  7.2 10.3  9.1"  270.0  HWE  59  RBTSCM,Ak
 9 D   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
 9 d    3256  6.1   85+ : AB  6.19 9.34 0.16" 301.3  HDS3256  SC
10 d  165283  8.4   89+ : AB  8.3       0.30" 245.0  ARU   5  ,AkW
10 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
11 D   *** Kepler Stars occulted, light curves are desired    RBTSCM,WChI
11 d  146801  7.9   95+ : AB  8.60 8.77 0.50" 133.9  BU  721  RBTSCM,AkWChI
   *** 146801 is in the Kepler2 program {ID = 246101155}
13 d   *** Kepler Stars occulted, light curves are desired    ,AkWChI

14 r  110169  9.1   99- : AB  9.2 11.8  0.65"  24.1  HDS 250   R
15 R     404  5.2   97- : **  4.8  7.4  0.036"  9.0  OCc 975  BTSCM
16 r   93452* 8.3   93- : **  9.3  9.3  0.06" 311.0  OCc 937  ,WChI
   ***  93452 is in the Kepler2 program {ID = 210548838}
17 r   93835  9.3   87- : **  9.2 10.4  0.02" 154.4  OCc 432  ,Ak
17 r X  5553  9.4   87- : AB  9.6 11.8  0.61" 122.3  A  2350  ,Ak
17 R   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
17 r   93898  9.4   86- : AB  9.4       0.01" 182.2  V988Tau° BTSCM
   ***  93898 is in the Kepler2 program {ID = 210786154}
18 r     766  5.8   80- : Aab 6.8  6.8  0.30" 350.0  OCc 301  ,WChI
18 r   77016  8.4   79- : **  8.9  9.5  0.05" 306.0  OCc1038  ,AkWChI
18 r   77058  8.4   78- : **  9.1  9.1  0.10"  97.0  OCc 848  RBTSCM
19 R    916#  4.3   71- : AB  4.77 5.50 0.10" 261.1  KUI  23° ,AkW
19 R    929*? 5.8   70- : AB  5.90 8.48 0.61" 347.2  BU 1241  RBTSCM
19 R    931#  6.9   70- : AB  7.45 7.80 0.22"  33.2  BU 1058° RBTS
19 r   *** Kepler Stars occulted, light curves are desired    RBTSCM
19 r   78155# 9.2   69- : AB  9.5 10.8  0.40"  39.1  COU 578  M
20 r   79111  9.5   59- : **  9.8  9.8  0.10" 271.0  OCc 797  ,Ak
21 R    1221  6.0   49- : AB  6.0 10.1  0.40" 350.0  SHN 269  ,AkWChI
21 r    1222  7.2   49- : **  7.2       0.01"   8.8  OCc1381  ,AkWCh
22 r   *** Kepler Stars occulted, light curves are desired    ,Ak
22 r   80694  9.8   36- : AB  9.8 11.6  1.3"  345.9  A  2135  BTSC
23 r   99001  9.4   25- : AB  9.7 11.2  0.34"  61.0  HDS1470  RBTM
24 r   99478  8.1   16- : AB  8.1 10.9  0.60"  41.5  HDS1591  R
24 r    1621  7.2   16- : **  8.2  8.2 0 .8"  150.0  OCc1424  B

30 d   *** Kepler Stars occulted, light curves are desired    M,AkWCh
30 D  159786  7.7    6+ : AB  9.9  7.9          8.7  CHR 233  ,Ak
30 d X 40883  9.2    7+ : AB  9.3 10.5  1.9"  248.1  HLD 128  CM
       X 40883:  B star is X136217
31 d   *** Kepler Stars occulted, light curves are desired    RBTSCM,AkWChI
31 D    2498  4.4   14+ : AB  4.4  8.9  3.6"   24.3  DOM 832  CM

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

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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