Double Stars Discovered by IOTA and Reported to JDSO (Journal of Double Star Observations) Tony George Presented at IOTA 2013 Conference Toronto, Ontario,

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Presentation transcript:

Double Stars Discovered by IOTA and Reported to JDSO (Journal of Double Star Observations) Tony George Presented at IOTA 2013 Conference Toronto, Ontario, Canada

JDSO Reports Submitted October 2012 – July 2013 Summary Table JDSO Publish Date Event DateAsteroid (No) Name Target StarSeparation (mas) PA Vol. 8 No. 4 Oct1, April 6 (336) Lacadiera 3UC ± ± 6.3 Vol. 9 No. 2 April 1, March 11 (57) Mnemosyne BN Orionis TYC SAO HD ± ± 15.2 Vol. 9 No. 2 April 1, August 12 (52) EuropaTYC ± ?.??.? Vol. 9 No. 3 July 1, December 3 (388) Charybdis UCAC ± ± 3.6

2009 April 16 (336) Lacadiera occults 3UC Carl Bracken, Bob Cadmus, Al Carcich, John Centala, Robert Modic, Doug Slauson The Lacadiera event found a fourth component of a previously known triple star system, making it a quadruple star system. This is an example of an ABAB event with very unequal star magnitudes. This was also the fist time that we used the UCAC3 catalog to report a double star. We used UCAC3 because it contained the other three components of the quadruple star system

Two chords showed a clear step event in the data, while a third chord showed a partial occultation of only one of the two components – essentially a graze event with only one component occulted. This may be a first for IOTA observers. BN Ori, an INSB eruptive variable. An A7 (Pre Main Sequence) star, 2-5 solar masses, with some surrounding gas and dust (faint emission nebula) and possessing an accretion disk. This report was of great interest to professional astronomers. BN Orionis (TYC ) Duplicity Discovery from an asteroidal occultation by (57) Mnemosyne John Brooks, Steve Conard, Joan Bixby Dunham, David W. Dunham, Robert Jones, Thomas R. Lipka, Wayne Thomas, Wayne H. Warren Jr., Rick Wasson, Jan Wisniewski,

TYC duplicity discovery from occultation by (52) Europa A singe chord observation by Brazilian IOTA observer Breno Loureiro Giacchini, appears to be a BABA event.

UCAC , a Double Star Discovered During an Asteroidal Occultation Ricard Casas, Jorge Juan, Ramon Naves, Carles Perelló, Joan Rovira, Antoni Selva, Carles Schnabel, Spain Six observations carried out from Catalonia, Spain. This is a BABA event.

No Reports in progress

Conclusions The discovery of double stars by asteroidal occultations continues to be an excellent method of finding or verifying double stars. Any time a light curve is obtained from a video record, it should be carefully examined for the presence of step events that could be due to duplicity of the target star.