Contents  on 11 July '17

NOTE:  These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some gaps in our traffic reporting for Earth's Busy Neighborhood.

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 11 July '17

Three objects reported inside ten LD

There are three visitors reported moving within ten lunar distances (LD) of Earth today. Nearest is newly announced 2017 NK2, which is outbound from 2.75 to 3.52 LD, while 2017 MR8 is inbound from 7.14 to 5.81 LD and 2017 MC4 comes its closest to our planet on this passage -- 7.61 LD at 0202 UTC. Up next, NHATS target 2017 BS5 arrives inside ten LD on July 16th.

This report was updated at 2214 UTC with the discovery of 2017 NK2 (MPEC). Your first A/CC asteroid traffic report report was generated at 1833 UTC with follow-up in today's DOU MPEC for 2017 MR8, 2017 MC4, and departed objects 2017 NB and radar target 441987 2010 NY65.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 11 July '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2331 UTC when the database was dated 11 July

Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 11 July '17

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 32 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 11 July '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-N68 - "21:40 UT" - 2011 CC22

MPEC 2017-N67 - "19:13 UT" - 2017 NM2

MPEC 2017-N66 - "19:10 UT" - 2017 NL2

MPEC 2017-N65 - "19:07 UT" - 2017 NK2

<< DOU on 11 July '17 >>  MPEC 2017-N64 - "11:59 UT" - Daily Orbit Update

Observers  on 11 July '17

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2016 UB107
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2017-N64 -- 2017 BM31, 66391, 190166, 2329, 1980
T05ATLAS Haleakala in Hawaii, 10 in MPECs 2017-N64 & 2017-N66 -- 2017 NL2, 2011 ED78, 2008 MH1, 88254, 68348, 485652, 6063, 6053, 4954, 1980
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2017-N64 -- 2017 NH, 232368
160Castelmartini Obs. in Italy, 9 in MPEC 2017-N64 -- 2017 NH, 2017 MC4, 441987, 20460, 190166, 142040, 141056, 136818, 106589
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-N64 -- 2017 NB
006Fabra Obs. in Spain, 1 in MPEC 2017-N64 -- 190166
203GiaGa Obs. in Italy, 1 in MPEC 2017-N66 -- 2017 NL2
K88GINOP-KHK in Hungary, 1 in MPEC 2017-N66 -- 2017 NL2
J95Great Shefford Obs. in England, 1 in MPEC 2017-N66 -- 2017 NL2
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-N66 -- 2017 NL2
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-N66 -- 2017 NL2
K38M57 Obs. in Italy, 1 in MPEC 2017-N66 -- 2017 NL2
Z22MASTER IAC Obs. in the Canary Islands, 2 in MPEC 2017-N64 -- 11398, 2329
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-N65 -- 2017 NK2
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-N64 -- 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2017-N64, 2017-N67 & 2017-N68 -- 2017 NM2, 2011 CC22, 53430, 388838
W25RMS Obs., 1 in MPEC 2017-N66 -- 2017 NL2
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-N65 & 2017-N66 -- 2017 NL2, 2017 NK2
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-N66 -- 2017 NL2
C95SATINO-1 in France, 1 in MPEC 2017-N64 -- 2017 MR8
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-N65 -- 2017 NK2
B18Terskol Obs. in Russia, 1 in MPEC 2017-N64 -- 2017 MC4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2017-N64 -- 2017 GS5, 2017 GQ6, 2017 FC157, 2017 AQ19
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2017 MB1NEODyS1640209824.33e-08-4.23-4.270NEODyS: "Based on 204 optical observations (of which 1 are rejected as outliers) from 2017-06-19.315 to 2017-07-09.270."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 11 July '17

Times are UTC for when items were noted or added by The Tracking News.

2331Noted Radar Astrometry database update - see above
2214Updated Traffic Report
2206Grabbed MPEC 2017-N68 - 2011 CC22 - see above
2014Grabbed MPEC 2017-N65 - 2017 NK2 - see above
Grabbed MPEC 2017-N66 - 2017 NL2 - see above
Grabbed MPEC 2017-N67 - 2017 NM2 - see above
1640Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
1400Grabbed MPEC 2017-N64 - Daily Orbit Update - see above