On February 3rd the RECON projects leads announced an optional observing event for asteroid (191) Kolga for the evening of Feb. 9th. The specifics of this event was also noted on Occult Watcher (OW) which provided many of the event details, like potential observing station information, path maps, data on the occulting asteroid and target star, etc. What many may not know, is that on the evening of Feb 9th, another event involving asteroid (154) Bertha was also predicted to occur approx. 17 minutes later then Kolga, over much of northern California and northern Nevada. The prediction paths for these two events crossed some 40-50 km northeast of Reno, Nevada. For my typical observing station in Gardnerville Nevada, I was NOT in the predicted path of either of these events, (although inside 1 sigma for the Bertha event). After some evaluation of the events and the possibility of observing positives for both, I decided to “go mobile” with an 8” SCT and attempt observing both events from a location near Lahonton State Recreation Area, which is northeast of Carson City (approx. 56 km). For this location OW predicted that I had a 78% positive observing probability for Kolga and a 98% probability for Bertha. The LiMovie generated light curves for these observations are below.
As can be seen, I was fortunate enough to record occultation events for both Kolga and Bertha. For Kolga the duration was 5.74 seconds and for Bertha 5.34 seconds. It is a rare opportunity that two events are predicted for the same evening so close in time and so close together, location wise. For me, it was even more surprising that, none of other potential obstacles to making these observations (travel, weather, setup, etc.), got in the way of a successful evening.