update 24-Jun-2017: SOFIA Arrives in New Zealand to Observe Southern Skies There are plans to fly SOFIA through another predicted occultation path on July 17. SOFIA is a huge (2.5 meter dia.) infrared telescope (1 ~ 250 um) with various cryogenic focal plane arrays that is flown above most of the water in Earth's atmosphere (YouTube). It sound like they will just use the visible light guide camera (behind the Nasmyth mirror?), rather than the infrared capability, but the portability is certainly handy. This mission might be "An Airplane Hunting for Shadows from the Kuiper Belt".
update 14-Jun-2017: non-committal blurb: https://www.nasa.gov/feature/new-horizons-team-digs-into-new-data-on-next-flyby-target
update 08-Jun-2017: There is also this blurb in Sky and Telescope's June 8 2017 article Observers Track New Horizons’ Next Target:
The Results are In (Sort of)
According to early reports gleaned by Sky & Telescope, June 3rd's effort couldn't have gone much better. Buie says that every team collected usable data, though some might have been partially impacted by clouds. "That is quite remarkable," he says, "and it took some heroics on the part of the South African teams." (Bad weather forced many of them to relocate.)
The stellar "shadow" cast by 2014 MU69 took about 11 minutes to sweep across Earth, so from any given location the star would disappear for no more than about 2 seconds. Since the cameras were making ½-second-long exposures, at most four frames will show the star missing. But even with such beefy telescopes, the expected signal-to-noise ratio (even in optimal conditions) won't be high.
So did anyone see the star disappear? Anja Genade (SAAO) reports good data but no disappearance with the 74-inch Radcliffe reflector in Sutherland. As for all those mobile teams, Buie isn't saying — at least just yet. Look for him to announce those results early next week.
@NASANewHorizons Jun 3
Clear skies and successful occultation obs in ARG and SA; now to dig into all the data! Credit:J.Jewell #mu69occ http://go.nasa.gov/2rOdJ3x
which suggests an occultation was successful, but I'm not sure of the definition of success in the tweet yet. Still looking for more info on this amazing group effort. There are two more similar occultations predicted for early July in AsteroidOccultations.com's News & Announcements for 2014 MU69, I hope we'll hear something more about this one before then.
The predicted time of the first of three occultations of +12 to +14 magnitude stars by asteroid 2014 MU69 has come and passed.
People have fanned out over South America and South Africa with telescopes with cameras and GPS clocks and are going to try to watch the shadow of a roughly magnitude +13 star cast by a rock in the KUIPER BELT pass over the Earth!
This is of course weather permitting, and early Twitter reports are already showing clear skies and images of the Omega Centauri star cluster. There is a Twitter hash tag for these events, #mu69occ. Here is a 500 millisecond exposure from a few days ago. The short exposure time is necessary to resolve small scale debris from the main occultation.
above: Omega Centari Star Cluster, 500 millisecond exposure. Tweeted by Alex Partker.
The goal is actually to look for shadows cast by even smaller debris, orbiting around the rock in the Kuiper belt. This is for New Horizons mission planning.
When will we hear at least a little news? Did anyone see a dip in a light curve at all? Something?
above: From AsteroidOccultations.com's News & Announcements for 2014 MU69