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 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 palbrl@clear.net.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 Aug No v ill magnitudes sepn PA? OCC # Visibility 1 D 2279* 6.1 68+ : ** 7.0 7.0 0.10" 90.0, OCc1485 BCMRST,AkChW 2 d *** Kepler Stars occulted, light curves are desired BCMST,AkChIW 2 d X 41431 8.9 76+ : AB 9.7 9.8 3.4" 85.0 SKI 10 R 3 d 160513 8.6 82+ : ** 9.2 9.2 0.10" 90.0 OCc 14 ,AkChW 3 d *** Kepler Stars occulted, light curves are desired BCMRST,AkChIW 3 d 160661 9.2 84+ : AB 9.3 11.8 2.3" 251.0 DON 847 CM,ChI 4 d X152851 9.4 89+ : AB 9.5 11.3 6.7" 46.6 B 2859 ,AkChW *** X152851 is in the Kepler2 program {ID = 227065848} 4 d X152648 8.6 89+ : ** 8.6 9.4 7.7" 120.6 OCc1538 ,W 4 d 161202# 9.3 89+ : Aab 9.3 10.5 0.20" 60.3 CHR 234 ,Ak 4 d *** Kepler Stars occulted, light curves are desired ,AkChIW 4 d 161229 8.8 89+ : ** 9.6 10.6 0.05" 296.0 OCc 566 ,AkChIW 4 d X153948# 9.4 89+ : ** 9.9 10.5 0.07" 54.0 OCc1748 ,AkChIW 4 D 161255* 7.4 89+ : Aab 6.8 9.3 265.0 SNA 85 ,AkChIW : ** 8.0 8.6 0.08" 280.0 OCc 564 ,AkChIW 4 161257? 7.7 89+ : ** 9.0 9.0 0.05" 350.0 OCc1539 ,AkCkIW 4 D 2658* 5.8 90+ : ** 6.2 6.2 0.05" 350.0 OCc1542 M,AkChIW 4 d 161399 9.2 90+ : AB 9.8 10.7 0.10" 192.0 CHR 235 ,I 4 d 161400# 9.2 90+ : ** 9.4 10.1 0.20" 228.0 OCc 474 BCMRST,AkChIW 4 D 2680* 5.6 91+ : ** 6.6 6.6 0.10" 322.0 OCc 988 CM,AkChIW 5 d *** Kepler Stars occulted, light curves are desired BCMRST,AkChIW 5 D 2787? 6.3 94+ : AB 6.35 9.16 0.70" 108.6 HDS2710 ,ChIW *** 2787 is in the Kepler2 program {ID = 218473951} 5 D 2794* 6.6v 95+ : ** 7.5 7.5 0.10" 90.0 OCc1569 ,AkChIW 5 D 2814# 4.9 95+ : ** 4.9 9.7 0.7" 180.5 OCc 599 BCMRST 5 D 2816 7.0 95+ : AB 7.0 10.4 37" 157.8 H S 77 BCMRST,AkW *** 2816 is in the Kepler2 program {ID = 218404213} 5 d 2828* 5.8 96+ : ** 3.7 6.7 0.02" 106.0 OCc 994 ,AkChIW 6 d 163176* 9.3 98+ : AB 9.5 0.40" 94.0 ARU 18 ,AkChIW 6 d 163192 7.9 98+ : ** 9.1 9.1 0.25" 90.0 OCc 340 ,I 8 r X180642 8.1 99- : AC 8.7 9.1 4.0" 82.1 STF2826 BCMRST,ChIW 8 r 164652 9.1 99- : AB 8.7 10.0 0.56" 77.8 HWE 58 CMS,AkW 9 r *** Kepler Stars occulted, light curves are desired CMRST,AkChIW 9 R 3325 6.9 97- : ** 7.5 7.5 0.01" 350.0 HWE 59 ,AkChIW *** 3325 is in the Kepler2 program {ID = 206225297} 10 r *** Kepler Stars occulted, light curves are desired BCRST,AkChIW 10 r 146777 9.2 91- : AB 9.3 11.2 0.77" 71.7 HDS3357 BCMST,AkChIW 11 r 128677 8.4 85- : ** 9.1 9.1 0.10" 84.0 OCc 594 ,Ak 11 R 55 6.4 84- : AB 6.47 8.91 0.40" 281.1 HDS 61 ,AkChI 11 R 61 7.8 83- : ** 8.5 8.5 0.05" 350.0 OCc1141 BCMRST 12 r *** Kepler Stars occulted, light curves are desired CS,AkChIW 13 r 298 7.1 67- : ** 8.0 8.0 0.10" 90.0 OCc1172 ,Ch 13 r 303 6.4 66- : ** 7.2 7.4 0.40" 115.0 OCc1174 B,AkChIW 13 r 110398 9.3 64- : ** 9.1 10.1 0.20" 277.0 OCc1179 ,ChIW 14 r X 3974 9.1 55- : AB 9.8 11.2 8.9" 11.9 PLQ 38 ,Ak 14 R 93301 7.2 53- : ** 7.9 7.9 0.10" 263.0 OCc 575 BCMRST,I 14 R 464* 6.1 52- : AB 6.1 0.50" 23.0 CHR 8 CM 15 r 93704 8.9 43- : ** 9.7 9.7 0.06" 241.0 OCc1033 ,AkChIW 15 r X 5224 9.5 42- : ** 9.9 10.6 0.48" 101.4 OCc 617 ,AkChW 15 r *** Kepler Stars occulted, light curves are desired BRST,AkChW 16 R 94294 7.6 30- : ** 8.7 8.7 0.10" 90.0 OCc 27 BCRST 16 R 764#?4.9 30- : AB 5.8 5.8 0.10" 2.0 A 3010° BCMRST 17 r X 8302 9.0 20- : AB 9.5 10.4 1.27" 193.3 A 105 CMS,I 17 R 913# 5.1 20- : AB 5.1 6.1 0.06" 62.6 MCA 24° B,AkChIW 17 R 915 4.6 20- : ** 5.5 6.3 0.02" 178.0 OCc 396 ,AkChIW 17 r *** Kepler Stars occulted, light curves are desired BCMST 18 r X 97591 10.6 12- : AB 11.4 11.6 5.2" 157.9 HO 29 ,Ak 18 r 96610# 8.1 11- : AB 8.2 10.1 0.52" 60.8 COU 925 CMRS 19 r *** Kepler Stars occulted, light curves are desired BCRST 24 d *** Kepler Stars occulted, light curves are desired BCMRST,ChIW 24 D 119305 8.9v 8+ : AB 8.9 12.5 1.93" 176.0 A 2487 BR *** 119305 is in the Kepler2 program {ID = 201578486} 25 d X 35802 10.0 14+ : AB 10.6 10.7 0.50" 308.0 TDS8701 BCMRST,I 26 d *** Kepler Stars occulted, light curves are desired BCMST,AkChIW 26 d 139656 9.8 22+ : ** 9.9 9.9 0.10" 118.0 OCc 643 ,I *** 139656 is in the Kepler2 program {ID = 212770303} 26 d 139661 9.4 23+ : AB 9.1 12.0 4.2" 249.1 RST4521 BCMST,I 26 d 139678 8.6 23+ : ** 8.8 8.8 0.10" 90.0 OCc 35 CMST 27 d 2113# 7.6 32+ : AB 7.92 9.21 0.42" 310.6 HU 141° BRT 27 d 158854 8.9 32+ : AB 9.30 9.84 0.40" 229.9 RST3938 M 28 D X 39610 7.7 40+ : AB 7.9 10.1 3.2" 35.6 BU 33 ,ChI X 39610, B star is X132801 28 d 159415# 8.2 42+ : AB 8.78 9.09 0.03" 99.4 HDS2210 BCMRST 29 d *** Kepler Stars occulted, light curves are desired BCMRST,ChIW 29 d 2365 7.3 51+ : AB 7.60 8.78 0.27" 51.3 RST3950° BCMRST,AkChI 30 d *** Kepler Stars occulted, light curves are desired CMRST,AkChIW 30 d 160325# 9.1 59+ : AB 10.01 9.67 0.40" 94.8 HU 168 BCST,Ak *** 160325 is in the Kepler2 program {ID = 230899515} 30 d 160341 10.1 60+ : AB 10.7 10.9 0.40" 102.0 TDT 256 BRT 30 d X 42110# 9.7 60+ : AB 9.6 9.7 1.2" 292.0 WHC 14 BCMRST : AC 9.6 10.6 10.3" 227.3 HJ 4932 BCMRST *** X 42110 is in the Kepler2 program {ID = 234634096} *** X 42110, B star is X140969 30 d 160421# 8.6 61+ : AB 8.9 10.0 1.00" 53.8 STN 33 BCMRST,ChI *** 160421 is in the Kepler2 program {ID = 233404113} 30 D 2495# 6.0 61+ : AB 6.34 7.56 2.42" 263.5 BU 126 CS,ChI : AC 6.3 11.2 12.1" 137.5 BU 126 CS,ChI *** 2495 is in the Kepler2 program {ID = 233441374} *** 2495, B star is X141441 31 d *** Kepler Stars occulted, light curves are desired BCMRST,Ch 31 D 160980 7.9 69+ : ** 8.4 8.4 0.05" 60.0 OCc1522 BT 31 D 2596 7.5 69+ : ** 0.05" 163.0 OCc1523 BCMST,Ak *** 2596 is in the Kepler2 program {ID = 227049676} 31 d 161033 9.6 69+ : Aab 9.8 9.8 0.40" 87.0 OCc 537 BRST : AB 9.7 11.5 9.7" 284.3 B 2431 BRST 31 d 161034 9.1 69+ : AB 9.1 11.7 8.4" 70.3 ARA 450 ,ChI 31 d 161043 9.1 69+ : ** 9.9 9.9 0.10" 53.0 OCc 536 BCMRST,Ak 31 d X 43398 7.4V 70+ : ** 8.8 8.8 0.05" 350.0 OCc1528 ,AkChIW ====================================================================== Visibility codes: Australia: B Brisbane, C Canberra, M Melbourne, R Rockhampton, S Sydney, T Tamworth 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 double number followed by ° indicates double has a known orbit. ==================================================================
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 palbrl@clear.net.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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