Contents  on 19 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 19 July '17

Two objects reported inside ten LD

Two objects are reported to be less than ten lunar distances (LD) from Earth today. NHATS target 2017 BS5 is inbound from 6.97 to 5.84 LD and 2017 MR8 is outbound from 6.93 to 8.33 LD.

This report was generated at 2109 UTC with follow-up in today's DOU MPEC for 2017 BS5 and three departed objects: 2017 NN6 and radar targets 2017 CS and 441987 2010 NY65, along with the recovery of distant NHATS target 478784 2012 UV136, plus astrometry from May for 2017 HU49 and from October 2012 for risk-listed radar/NHATS target 2012 TC4.

During the past two days there were observations reported of some of these and other recently active objects plus the discovery of already departed 2017 NN6 (MPEC) -- a rock perhaps 330 meters in diameter that flew past us at 7.41 LD on July 5th, and the recovery of distant 1999 XL136 (DOU). There were also radar observations posted for more close-passers: from June here and here for 2017 ME4, 2017 MC3, 2017 MB3, 2017 LX, 2017 LE, 2017 KR27, and 2017 KJ27, plus we missed reporting a posting from late on July 13th for one more: NHATS target 2016 WB8 from December.

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. "Distant" is used here to describe objects that have come within ten LD since A/CC began these traffic reports (2007) but are not now so close. 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 19 July '17

Radar observation of six objects

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

Data update noted at 2230 UTC when the database was dated 19 July

Data update noted at 2301 UTC when the database was dated 19 July

Data update noted at 2358 UTC when the database was dated 19 July

NEOCP Activity  on 19 July '17

The MPC's NEO Confirmation Page has 11 listings

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

New MPECs  on 19 July '17

Minor Planet Electronic Circulars

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

<< DOU on 19 July '17 >>  MPEC 2017-O21 - "11:59 UT" - Daily Orbit Update

MPEC 2017-O20 - "11:05 UT" - 2017 OA

MPEC 2017-O19 - "11:02 UT" - 2017 NU6

MPEC 2017-O18 - "10:59 UT" - 2017 NT6

MPEC 2017-O17 - "10:57 UT" - 2017 NS6

MPEC 2017-O16 - "10:54 UT" - 2017 NR6

MPEC 2017-O15 - "10:51 UT" - 2017 NQ6

Observers  on 19 July '17

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 6 in radar -- 2017 HB1, 2017 FX90, 2017 FU64, 2017 FU102, 2017 FQ127, 2017 FF128
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2017-O16, 2017-O17, 2017-O18, 2017-O19 & 2017-O21 -- 2017 NU6, 2017 NT6, 2017 NS6, 2017 NR6, 496230, 482562, 478784, 248590
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-O21 -- 232691
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2017-O21 -- 2017 MB1, 481394, 366733, 304640, 190166, 142040, 13651, 12538, 11398, 2329, 1917
215Buchloe Obs. in Germany, 1 in MPEC 2017-O21 -- 2017 NS5
160Castelmartini Obs. in Italy, 11 in MPEC 2017-O21 -- 2017 CS, 495331, 265962, 20460, 190166, 142561, 142040, 136818, 11398, 106589, 7336
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 23 in MPECs 2017-O15, 2017-O16, 2017-O17, 2017-O18, 2017-O19, 2017-O20 & 2017-O21 -- 2017 OA, 2017 NU6, 2017 NT6, 2017 NS6, 2017 NR6, 2017 NQ6, 2017 NN6, 2017 MZ3, 2017 MW2, 2017 MV4, 2017 MN8, 2017 MM, 2017 MJ8, 2017 MJ7, 2017 MF4, 2017 ME7, 2017 ME, 2017 MB, 2017 MA4, 2017 LG1, 2017 KO31, 2017 KE3, 2017 GO7
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2017-O21 -- 52750, 2102
734Farpoint Obs. in Kansas, 3 in MPECs 2017-O17, 2017-O19 & 2017-O20 -- 2017 OA, 2017 NU6, 2017 NS6
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-O21 -- 2012 TC4
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-O21 -- 2012 TC4
K83Forti Obs., 4 in MPEC 2017-O21 -- 20460, 190166, 138925, 11398
157Frasso Sabino Obs. in Italy, 2 in MPEC 2017-O21 -- 2017 NS5, 2017 MB1
K73Gravina Obs. in Italy, 1 in MPEC 2017-O21 -- 190166
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2017-O21 -- 190166, 136818
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-O21 -- 11398
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-O15 -- 2017 NQ6
568_Marco Micheli on Mauna Kea in Hawaii, 4 in MPECs 2017-O15, 2017-O16, 2017-O17 & 2017-O18 -- 2017 NT6, 2017 NS6, 2017 NR6, 2017 NQ6
Z80Northolt Branch Obs. in England, 2 in MPEC 2017-O21 -- 2017 NS5, 190166
G34Oberfrauendorf Obs. in Germany, 2 in MPEC 2017-O21 -- 2017 NM6, 2017 MB1
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2017-O15, 2017-O16, 2017-O17, 2017-O18, 2017-O19, 2017-O20 & 2017-O21 -- 2017 OA, 2017 NU6, 2017 NT6, 2017 NS6, 2017 NR6, 2017 NQ6, 2017 MH7, 143678
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2017-O21 -- 495331, 441987
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-O17 & 2017-O18 -- 2017 NT6, 2017 NS6
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-O18 -- 2017 NT6
Y00SONEAR in Brazil, 1 in MPEC 2017-O21 -- 2017 MB1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-O21 -- 138925
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-O18 -- 2017 NT6
B18Terskol Obs. in Russia, 2 in MPECs 2017-O17 & 2017-O21 -- 2017 NS6, 2017 BS5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-O21 -- 2017 HU49, 2017 BG85
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 NR6JPL Sentry16002041-211066.784e-09-6.76-7.080JPL: Computed at 07:12 today Pacific time based on 19 observations spanning 3.8330 days (2017-Jul-15.27643 to 2017-Jul-19.109415). Diameter approximately 0.130 km. from weighted mean H=22.09.
2017 MB1JPL Sentry16002098-209811.280e-07-3.79-3.790JPL: Computed at 07:55 today Pacific time based on 315 observations spanning 29.590 days (2017-Jun-19.31418 to 2017-Jul-18.904212). Diameter approximately 0.610 km. from weighted mean H=18.72.
NEODyS1115209811.37e-07-3.76-3.760NEODyS: "Based on 301 optical observations (of which 2 are rejected as outliers) from 2017-06-19.315 to 2017-07-18.045."

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 19 July '17

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

2358Noted Radar Astrometry database update - see above
2301Noted Radar Astrometry database update - see above
2230Noted Radar Astrometry database update - see above
2109Generated Traffic Report
1600Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Noted that JPL Sentry has posted 2017 NR6 as an impact risk - see above
Grabbed MPEC 2017-O21 - Daily Orbit Update - see above
1115Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Grabbed MPEC 2017-O15 - 2017 NQ6 - see above
Grabbed MPEC 2017-O16 - 2017 NR6 - see above
Grabbed MPEC 2017-O17 - 2017 NS6 - see above
Grabbed MPEC 2017-O18 - 2017 NT6 - see above
Grabbed MPEC 2017-O19 - 2017 NU6 - see above
Grabbed MPEC 2017-O20 - 2017 OA - see above