Good luck to all of our RECON Teams on two occultation opportunities this month:
Also, on Saturday morning, November 11 around 17UT, the waning crescent moon will occult the star Regulus. This event will occur during daylight hours for the western US, but through a telescope, with binoculars, or even just naked eye, you should be able to see both the moon and Regulus before the occultation occurs. The prediction map below shows the path of the moon’s shadow. This map, along with predicted occultation time by major city, is also available at http://www.lunar-occultations.com/iota/bstar/1111zc1487.htm.
Shadow prediction for lunar occultation of Regulus
Marc and the New Horizons team successfully measured 2014 MU69 during an occultation opportunity during July. Check out the radio interview produced by “How On Earth” earlier this week!
Shadow Chasers (Photo: Jack Jewell)
There are two main belt asteroid occultation opportunities for teams located from:
- Southern Oregon to Portola CA on Friday night, July 21 around 11:20PM PDT/MST
- Owens Valley down to Lake Havasu City AZ on Saturday night, July 22, around 11:04PM PDT/MST
Both campaigns are optional, but they provide great practice opportunities and will contribute to IOTA efforts. Participating teams are encouraged to sign up using OccultWatcher (or to contact John Keller so that he can sign your team up on OW). Details are provided below.
RECON Teams: North Lake OR to Portola CA
Date: 22 Jul 2017 at 06:21 UT
Recording Window: 06:20-06:23 UT
IOTA Details: http://www.asteroidoccultation.com/2017_07/0722_1428_58040.htm
RECON Teams: Bishop CA to Lake Havasu City AZ
Date: 23 Jul 2017 at 06:04 UT
Recording Window: 06:03-06:06 UT
IOTA Details: http://asteroidoccultation.com/2017_07/0723_76_58054.htm
Happy Fourth of July, RECON!!!
We wanted to provide a heads up about an exciting opportunity to measure Chiron, a 100-km Centaur with suspected ring structure(s)! We will have an event page up shortly, but the map below provided by LESIA at L’Observatoire de Paris shows that the probabilities of successfully recording this object are high and that the extended RECON network down to Arizona is well positioned to map any extended structures associated with the main body!
Prediction map for occultation by Centaur Chiron on 2017 August 15 UT
The event will occur early on the morning of Tuesday, August 15 around 11:51 UT (4:51AM PDT/MST). Twilight will be approaching during the occultation, but there should be plenty of time to get onto the field prior to this. Mark your calendars now and stay tuned for details!
Marc has uploaded a new podcast regarding the New Horizons occultation campaign earlier this month involving 2014 MU69. The podcast series can be accessed using any browser and no downloads are needed to hear it through the SoundCloud player below. You can also subscribe to our podcasts through itunes which can be found by searching “tnorecon”.
Sky & Telescope just published a nice article about last week’s Southern Hemisphere occultation involving 2014 MU69:
Observers Track New Horizons’ Next Target – Sky & Telescope
All teams on the campaign collected useable data which is currently being analyzed. A photo of RECON Team Member Robert Reaves from Parker, Arizona is included in the article.
RECON Team Member Robert Reaves participating in MU69 campaign in Argentina
This is an exciting week for RECON Principal Investigator Marc Buie as well as RECON team member Robert Reaves from Parker, Arizona. Marc is leading a dual continent occultation campaign involving 22 telescopes being deployed in Argentina and South Africa to measure the shadow of 2014 MU69, the next target for the NASA New Horizons mission. This Friday evening (2017 June 3 at 03:11:50 UT) 22 teams will be deployed on both continents for the first of three occultation opportunities this summer.
Marc invited RECON team member Robert Reaves to join one of these teams for this week’s event. Both Marc and Robert are currently in South America prepping for the big event. For the next occultation opportunity in early July, Charlene Weisenborn from our Searchlight / Boulder City team will be participating as well.
Marc has been centrally in charge of working on predictions for these campaigns using Hubble and Gaia data. In addition to observing form Argentina this week, he will also be flying aboard NASA SOFIA during the July event. According to Marc, our experience setting up the RECON network of over 50 telescope sites has been very valuable in prepping for these campaigns. Because 2014 MU69 is only thought to be around 30 km, the spacing of the network will be much tighter than RECON, with telescopes spaced roughly every 10 km rather than 50 km.
For more information, you can check out the New Horizon’s Webpage and the following post: New Horizons Deploys Global Team for Rare Look at Next Flyby Target
Over the next six weeks, the New Horizons mission team gets an “MU69” preview of sorts – and a chance to gather some critical encounter-planning information – with a rare look at their target object from Earth.
Good luck, Marc, Robert, and all involved in Friday’s campaign!
We’re looking for feedback from team members to help us plan our upcoming RECON Team Meeting this Fall. Thank you for completing the 2017 RECON Team Meeting Survey.
Thanks! John and Marc
Our RECON event this Friday evening involving Centaur 07RG283 is going to be challenging to begin with, given that that target star (UC4-683-022040 in Perseus) is a very dim object at magnitude 16.3. While still within reach of our telescope-camera system, clear skies will be required.
Unfortunately, as the Clear Sky Clock sky forecast map below shows, clear skies this Friday evening will be hard to come by! In a rare reversal, sky conditions in Washington could be marginally better than the rest of the network, although even here things will be dicey. Such are the challenges of ground-based astronomy research. While we anticipate most sites will be clouded out, we appreciated all teams completing the RECON Campaign Observation Report Form, which will be available for one week following the event time.
Sky forecast map at event time for 07RG283 event.
Our next RECON event this coming Monday evening involves Centaur 12CG! A challenging component of this event is that the target will be rising low in the eastern sky. Note that this won’t give our teams a ton of time to lock on the star field.
We wanted to take this opportunity to talk for a second about the naming convention for TNOs and other minor planets. For all of our previous events, you may have noticed that objects had names like 14UT114 and 08FC76, while our event this week does not have a number at the end. Let’s break this down.
The name 12CG indicates that this object was the seventh minor planet discovered in the two week period between February 1 – February 15, 2012. The first two digits (12) represent the year of discovery and the first letter (C) indicates the half-month of discovery. The letter A is for objects discovered between January 1-15, B is for January 16-31, and C for February 1-15. Note that the letter “I” is skipped, resulting in Y representing the 24th half-month of December 16-31. The second character (G) is the order of discover, with A being the first object in that period and G being the seventh. Here again, the letter “I” is not used, so this naming convention can be used for the first 25 objects discovered in a given half-month.
So why do most TNOs end with a number while 12CG does not? After the 25 object discovered in a half month,a number is indexed at the end of the name and second alpha character cycles back through the alphabet. Thus, while the 25th discovered object between February 1 – February 15 would be 12CZ, the 26th object would be named 12CA1, and the 27th would be 12CB1.
Ready to quiz yourself? Try 14UT114:
- 14U = Object was discovered between October 16-31, 2014
- T114 = We’ve cycled 114 times through the 25 letters of the alphabet (minus the letter “I”), or 114 x 25 = 2,850 times. The letter T indicates it is the 19th object after these 2,850 prior objects. So the object is the 2,869th discovery of this half-month.
How about 08FC76? . . . yup, the 1,903rd minor discovered between March 16-31, 2008. For more information and clarification, check out the following Wikipage on provisional designation in astronomy.
Good luck to all of our teams this Monday evening!!!