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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 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 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
Oct No v ill magnitudes sepn PA° OCC # Visibility
1 D X 49923 7.4 80+ : AB 8.3 8.3 3.4" 326.7 H 1 47° RBTSCM,AkWChI
X 49923: B star is X178290
1 d 164259 8.5 81+ : ** 9.3 10.6 0.24" 6.8 OCc 589 ,ChI
2 d *** Kepler Stars occulted, light curves are desired RBTSCM.AkWChI
2 d 164820 8.7 88+ : AB 8.7 9.1 19.1" 122.4 STF2851 TSCM,AkWChI
*** 164820 is in the Kepler2 program {ID = 206104118}
164820: B star is 164821
3 d *** Kepler Stars occulted, light curves are desired SCM
3 d Neptune 7.8 Both contacts at Neptune's bright limb ,AkWChI
4 d *** Kepler Stars occulted, light curves are desired RBTSCM,AkChWI
4 D 3514#?5.9 98+ : AB 6.7 6.7 0.07" 137.4 FIN 359° RBTSCM,AkWChI
6 r *** Kepler Stars occulted, light curves are desired CM,AkWChI
8 r 93411 8.7 90- : ** 9.3 9.3 0.10" 9.0 OCc 626 B,AkWChI
9 r 93914 7.8 81- : AB 6.4 9.1 1.3" 243.7 PAT 6 RBTS
9 r *** Kepler Stars occulted, light curves are desired RBTSCM,AkWChI
9 r 93913 7.0 81- : ** 7.6 10.6 0.18" 108.8 OCc 615 RBTCM,AkWCh
9 r 93933 8.0 81- : ** 8.7 8.7 0.02" 23.0 OCc 553 R
9 r 93958 7.8 81- : ** 9.0 9.0 0.50" 279.0 OCc 532 RBTSCM
9 R 93962 7.0 80- : ** 7.0 0.01" 301.5 OCc1235 RBTSCM,AkWChI
*** 93962 is in the Kepler2 program {ID = 210640991}
9 r 93964*?9.0 80- : ** 9.9 9.9 0.40" 108.0 OCc 483 ,AkWChI
*** 93964 is in the Kepler2 program {ID = 210666330}
9 R 93963* 6.9 80- : Aa 7.7 7.7 0.03" 337.0 OCc1036 ,AkWChI
*** 93963 is in the Kepler2 program {ID = 210664191}
9 r 93967# 7.8 80- : AB 9.37 8.09 0.06" 237.3 COU 567 BTSCM,AkWChI
*** 93967 is in the Kepler2 program {ID = 210650598}
9 r X 70180 9.5 80- : AB 9.5 0.01" 228.4 VVO 394° RBTSCM
*** X 70180 is in the Kepler2 program {ID = 210652965}
9 R 684 6.2 80- : AB 6.97 7.02 3.10" 275.9 STF 559 BTSCM
*** 684 is in the Kepler2 program {ID = 247031423}
684: B star is X 70265
10 R 94684 7.2 69- : AB 7.2 10.9 0.80" 69.5 HDS 749 CM
11 R 995#?4.1v 60- : Aab 4.1 5.1 0.10" 125.4 BTZ 1° RBTSCM,AkWChI
11 r 78420* 8.0 60- : Bab 8.6 8.9 0.20" 316.2 BU 1192 RBTC,AkWChI
: ** 8.6 8.9 0.20" 246.0 OCc1320 RBTC,AkWChI
12 r 97053 9.1 47- : AB 9.2 11.5 1.13" 17.5 COU 475 RBTSCM
13 r *** Kepler Stars occulted, light curves are desired RBTSCM,Ak
13 R 1275 5.3#? 36- : ** 6.4 6.4 0.10" 100.0 OCc 690 RBTSCM,AkWChI
13 r 97914 9.1 36- : ** 9.6 9.6 0.10" 90.0 OCc 213 RBTS
14 R 98613 8.4 26- : ** 8.9 8.9 0.10" 120.0 OCc 609 RBTSCM
14 r 98581# 8.7 26- : AB 9.91 9.98 3.31" 125.6 COU 475 ,AkWChI
98581: B star is X114795
16 r 1625 5.8 10- : Aab 6.7 6.7 0.10" 90.0 OCc 137 ,W
21 d 2137 6.6 2+ : ** 7.2 7.2 0.05" 350.0 OCc1469 C
22 D X 39946 9.8 6+ : AB 9.8 12.1 4.0" 341.7 HU 478 RBT
23 D *** Kepler Stars occulted, light curves are desired RBTSCM,AkWChI
24 D 160499 8.5 18+ : AB 8.7 11.8 6.0" 305.1 ARA 442 ,Ak
*** 160499 is in the Kepler2 program {ID = 234549935}
24 d 160522* 9.0 18+ : ** 9.6 9.6 2.5" 91.0 OCc1502 B
24 D *** Kepler Stars occulted, light curves are desired RBTSCM,AkWChI
24 d X142310#10.6 19+ : AB 11.2 11.5 0.60" 87.0 RST3102 RBTSCM
*** X142310 is in the Kepler2 program {ID = 227255118}
25 d *** Kepler Stars occulted, light curves are desired ,WChI
25 d 161202# 9.3 26+ : Aab 9.3 10.5 0.20" 60.3 CHR 234 ,AkWCh
: AB 9.3 13.5 15.4" 61.3 ARA 738 ,AkWCh
25 d X152851 9.4 26+ : AB 9.5 11.3 6.7" 46.6 B 2859 ,AkWChI
: AC 9.5 12.3 11.5" 148.8 SIN 108 ,AkWChI
*** X152851 is in the Kepler2 program {ID = 227065848}
25 d X 43571 9.3 26+ : ** 10.1 10.3 0.9" 230.0 OCc 466 ,AkWChI
25 D X 43600# 8.8 26+ : AB 9.6 9.6 0.30" 91.9 RST5108 RBT,
25 d X153657 10.3 26+ : AB 10.3 11.4 2.4" 109.4 B 2439 RBTT,AkWChI
25 d X153714 10.1 26+ : AB 10.7 11.0 0.50" 291.0 B 2440 BTSC,AkWChI
25 d X154008 9.1 26+ : AB 9.2 10.7 7.4" 295.8 B 2862 RBTSCM
25 d 161229 8.8 26+ : ** 9.6 10.6 0.05" 296.0 OCc 566 ,I
25 D 161257*?7.7 27+ : ** 9.0 9.0 0.05" 350.0 OCc1539 ,AkWChI
25 d 161245* 8.9 27+ : AB 8.9 11.9 2.5" 257.0 B 1885 ,AkWChI
25 d X 43667 9.9 27+ : AB 9.9 11.9 5.9" 308.7 B 2863 RBTSCM,AkWChI
25 d X153948# 9.4 27+ : ** 9.9 10.5 0.07" 54.0 OCc1748 ,AkWChI
25 D 161255* 7.4 27+ : Aab 6.8 9.3 265.0 SNA 85 ,AkWChI
: ** 8.0 8.6 0.08" 280.0, OCc 564 ,AkWChI
25 d X 43711# 9.9 27+ : ** 10.4 10.9 0.22" 93.0 OCc1749 TSCM,AkChWI
25 D 2658* 5.8 27+ : ** 6.2 6.2 0.05" 350.0 OCc1542 ,I
25 D 161273# 7.6 27+ : AB 8.40 8.27 0.50" 116.1 BU 246 R
: Bab 8.7 9.6 0.10" 335.6 WSI 89 R
25 d 161400# 9.2 27+ : ** 9.4 10.1 0.20" 228.0 OCc 474 SCM
26 D 2791 5.6 35+ : AB 6.2 6.2 0.05" 209.5 V4024Sg RBTSCM,Ak
26 d X164624 10.5 35+ : AB 10.5 10.7 0.9" 270.4 B 2470 TSM
26 D 2794* 6.6v 36+ : ** 7.5 7.5 0.10" 90.0 OCc1569 CM,AkWChI
26 d *** Kepler Stars occulted, light curves are desired RBTSCM
27 d 163176* 9.3 45+ : AB 9.5 0.40" 94.0 ARU 18 BTSCM,AkWChI
27 d 163194 10.0 45+ : AB 10.1 0.40" 159.0 ARU 19 CM
28 d X176377 8.3 54+ : AB 9.1 9.1 3.7" 289.8 SKT 11 ,Ak
X176377: B star is X176375
28 d X176845 9.8 55+ : AB 9.8 10.4 6.7" 240.9 HJ 3001 R
28 d 163948 8.4 55+ : AB 8.97 9.97 2.71" 60.2 BU 154 RBTSCM,AkWCh
163948: B star is X176912
29 d X180642 8.1 66+ : AC 8.7 9.1 4.0" 82.1 STF2826 RBTSCM
X180642: C star is S164652 (below)
29 d 164652 9.1 66+ : AB 8.7 10.0 0.56" 77.7 HWE 58 BCM
30 d *** Kepler Stars occulted, light curves are desired RBTSCM
30 d 165111 8.7 74+ : Aab 8.8 11.4 0.40" 71.0 HDS3183 ,ChI
*** 165111 is in the Kepler2 program {ID = 206189649}
30 D 3307 4.8 74+ : AB 4.8 8.5 3.7" 10.0 HDS3190 R
3307: B star is X182884
31 d *** Kepler Stars occulted, light curves are desired RBTSCM,AkWChI
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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 or OCC number followed by ° indicates double has a known orbit.
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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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