Contents  on 20 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 20 July '17

Two objects reported inside ten LD

Two minor objects are known to be passing within ten lunar distances (LD) of our planet today. NHATS target 2017 BS5 is inbound from 5.84 to 4.79 LD and 2017 MR8 is outbound from 8.33 to 9.77 LD.

This report was generated at 2232 UTC with follow-up in today's DOU MPEC for 2017 BS5 and departed objects 2017 NN6, 2017 ND (10.36 days added to it 4.44-day observing arc), and radar target 2017 CS. And radar observation was reported today and late yesterday for a dozen other close-passers from March and April: 2017 HB1, 2017 FF128 (first follow-up), 2017 FQ127, 2017 FX90, 2017 FU64, 2017 FV, 2017 EK, 2017 DA38, intruder 2017 FU102, and NHATS targets 2017 FR91, 2017 FR63, and 2017 ED. We also note for the record that JPL is showing that 2017 MF, which passed us at 1.02 LD in June, also flew by at around 5.8 LD in June 2015.



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 20 July '17

Radar observation of 14 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 0112 UTC when the database was dated 19 July


Data update noted at 1931 UTC when the database was dated 20 July


Data update noted at 2004 UTC when the database was dated 20 July


Data update noted at 2156 UTC when the database was dated 20 July


Data update noted at 2300 UTC when the database was dated 20 July


Data update noted at 2358 UTC when the database was dated 20 July

NEOCP Activity  on 20 July '17

The MPC's NEO Confirmation Page has 15 listings

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

New MPECs  on 20 July '17

Minor Planet Electronic Circulars

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


<< DOU on 20 July '17 >>  MPEC 2017-O22 - "11:59 UT" - Daily Orbit Update

Observers  on 20 July '17

A total of 34 observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 14 in radar -- 2017 FV, 2017 FR91, 2017 FR63, 2017 EK, 2017 ED, 2017 DV15, 2017 DA38, 2017 CP1, 2017 CF32, 2017 BM123, 2012 DR32, 483656, 10636, 45P
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2017-O22 -- 2017 NL2, 2017 ND, 2017 MY2, 2017 MX2, 2017 MW7, 2017 MW4, 2017 MT8, 2017 MN7, 2017 MG4, 2017 MG3, 2017 MB1, 2017 GQ6, 2017 FH90, 2013 JY35, 496230, 477519
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2017-O22 -- 2011 ED78, 6063
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-O22 -- 2017 NS5, 2017 NM6, 2017 GQ6, 2017 BS5, 90075, 68950, 66391, 138925
160Castelmartini Obs. in Italy, 8 in MPEC 2017-O22 -- 2008 MH1, 66146, 53319, 416584, 366733, 294739, 232368, 143992
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-O22 -- 2016 CJ159
107Cavezzo Obs. in Italy, 1 in MPEC 2017-O22 -- 2017 NM6
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2017-O22 -- 2017 HW48, 215442, 3288
006Fabra Obs. in Spain, 2 in MPEC 2017-O22 -- 190166, 11398
K88GINOP-KHK in Hungary, 2 in MPEC 2017-O22 -- 2017 NH, 2017 ND
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 45P
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-O22 -- 2017 MB1
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-O22 -- 2017 MB1
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPEC 2017-O22 -- 2017 MY2, 2017 KR34
246KLENOT in the Czech Republic, 1 in MPEC 2017-O22 -- 11398
6881program code 1 via Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2017-O22 -- 2016 CJ159
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-O22 -- 2014 YC15
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-O22 -- 2017 OA
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-O22 -- 2016 CJ159
0895program code 5 via Nikolaev Obs. in Ukraine, 2 in MPEC 2017-O22 -- 2017 NS5, 2017 MB1
J43Oukaimeden Obs. in Morocco, 5 in MPEC 2017-O22 -- 2016 CJ159, 2015 FO124, 2011 ED78, 438452, 20460
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2017-O22 -- 2017 MG3, 2016 CJ159, 142040
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 18 in MPEC 2017-O22 -- 2017 NS5, 2017 NM6, 2017 CS, 2017 BS5, 2017 BM31, 2016 CL32, 2013 TH5, 2011 NP, 68950, 496018, 495331, 294739, 20460, 142561, 142040, 138925, 138846, 11398
Z38Picoto Obs., 1 in MPEC 2017-O22 -- 2017 MB1
A48Povegliano Veronese Obs. in Italy, 2 in MPEC 2017-O22 -- 2017 NS5, 2017 NM6
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-O22 -- 2016 CJ159, 415715, 244670, 7336
H36Sandlot Obs. in Kansas, 3 in MPEC 2017-O22 -- 2017 MT8, 2017 MQ8, 2017 MC5
033Schwarzschild Obs. in Germany, 4 in MPEC 2017-O22 -- 2017 NU6, 2017 NT6, 2017 NS6, 2017 MY2
K14Sencelles Obs. in Spain, 1 in MPEC 2017-O22 -- 2017 NM6
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-O22 -- 2017 NN6
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-O22 -- 2016 CJ159
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-O22 -- 138925
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-O22 -- 2017 GM7
C51WISE in Earth polar orbit, 3 in MPEC 2017-O22 -- 2009 WC52, 495960, 488789
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2017 MH7NEODyS1252R E M O V E D-
2017 MZ3NEODyS1252R E M O V E D-
2017 MB1JPL Sentry15202098-209817.315e-08-4.04-4.040JPL: Computed at 07:55 today Pacific time based on 345 observations spanning 30.846 days (2017-Jun-19.31418 to 2017-Jul-20.16038). Diameter approximately 0.610 km. from weighted mean H=18.74.
NEODyS1252209812.06e-07-3.58-3.580NEODyS: "Based on 317 optical observations (of which 2 are rejected as outliers) from 2017-06-19.315 to 2017-07-18.905."
2012 TC4NEODyS12522020-2116876.57e-05-4.99-5.890NEODyS: "Based on 357 optical observations (of which 0 are rejected as outliers) from 2012-10-04.468 to 2012-10-11.749."

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 20 July '17

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

2358Noted Radar Astrometry database update - see above
2300Noted Radar Astrometry database update - see above
2232Generated Traffic Report
2156Noted Radar Astrometry database update - see above
2004Noted Radar Astrometry database update - see above
1931Noted Radar Astrometry database update - see above
1520Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
1252Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Noted that NEODyS has removed 2017 MH7 as an impact risk - see above
Noted that NEODyS has removed 2017 MZ3 as an impact risk - see above
Grabbed MPEC 2017-O22 - Daily Orbit Update - see above
0112Noted Radar Astrometry database update - see above