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HD 89309


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Speckle Interferometry of New and Problem HIPPARCOS Binaries
The ESA Hipparcos satellite made measurements of over 12,000 doublestars and discovered 3406 new systems. In addition to these, 4706entries in the Hipparcos Catalogue correspond to double star solutionsthat did not provide the classical parameters of separation and positionangle (rho,theta) but were the so-called problem stars, flagged ``G,''``O,'' ``V,'' or ``X'' (field H59 of the main catalog). An additionalsubset of 6981 entries were treated as single objects but classified byHipparcos as ``suspected nonsingle'' (flag ``S'' in field H61), thusyielding a total of 11,687 ``problem stars.'' Of the many ground-basedtechniques for the study of double stars, probably the one with thegreatest potential for exploration of these new and problem Hipparcosbinaries is speckle interferometry. Results are presented from aninspection of 848 new and problem Hipparcos binaries, using botharchival and new speckle observations obtained with the USNO and CHARAspeckle cameras.

Photoelectric observations of lunar occultations. XI
Occultation observations of 466 events are presented. These includediameter measures of Aldebaran under very bad conditions and a gooddiameter measure of 82 Vir. The list includes 91 reappearances andobservations of 34 double or multiple stars, both new and previouslyknown. The inconsistencies of the observations of Kui 88 are discussed.Further observations are most desirable.

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Pozíciós és asztrometriai adatok

Csillagkép:Oroszlán
Rektaszcenzió:10h18m19.17s
Deklináció:+08°40'56.2"
Vizuális fényesség:8.454
Távolság:199.203 parszek
RA sajátmozgás:0.7
Dec sajátmozgás:-6.1
B-T magnitude:8.704
V-T magnitude:8.475

Katalógusok és elnevezések:
Megfelelő nevek
HD 1989HD 89309
TYCHO-2 2000TYC 837-349-1
USNO-A2.0USNO-A2 0975-06460783
HIPHIP 50470

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