Contents  on 13 August '19

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 13 August '19

One object reported inside ten LD

One Solar-System small body is reported to be less than ten lunar distances (LD) from our home world today. 2019 PS1 is outbound from 7.52 to 9.67 LD.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.01 LD Aug. 9 2019 PS1 15 m  7.52 to 9.67 LD Aug. 5 - 14
Approaching Traffic - sorted by 10-LD bubble entry date
8.74 LD Aug. 16 2019 PJ 57 m  10.83 from 12.97 LD tomorrow - Aug. 17 DOU
2.7   LD Aug. 28* 2019 OU1 90 m  43.0 from 46.1 LD Aug. 25 - 31 Earth passage uncertainty +/- 22 mins.*

This report was generated at 1740 UTC with first follow-up in today's DOU MPEC for approaching 2019 PJ (5.77 days added to 1.86-day discovery arc) and departed risk-listed 2019 NX5 (5.82 days in early July added to 0.99), along with follow-up for departed objects 2019 NN4 and risk-listed 2019 NW2.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal 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.

NEOCP Activity  on 13 August '19

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 35 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 13 August '19

Minor Planet Electronic Circulars

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

MPEC 2019-P98 - "18:46 UT" - 2019 PN2

MPEC 2019-P97 - "13:40 UT" - 2018 WB1

<< DOU on 13 August '19 >>  MPEC 2019-P96 - "12:02 UT" - Daily Orbit Update

Observers  on 13 August '19

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2019-P97 & 2019-P98 -- 2019 PN2, 2018 WB1
Z36Cancelada Obs., 1 in MPEC 2019-P96 -- 153842
160Castelmartini Obs. in Italy, 9 in MPEC 2019-P96 -- 2016 NL15, 85709, 503960, 243025, 18172, 5626, 3102, 2100, 1865
W92MASTER OAFA Obs., 1 in MPEC 2019-P96 -- 9400
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2019-P96 -- 340666, 326777
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2019-P97 & 2019-P98 -- 2019 PN2, 2018 WB1
J69North Obs. in England, 2 in MPEC 2019-P96 -- 2017 YT5, 173561
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2019-P96, 2019-P97 & 2019-P98 -- 2019 PN2, 2019 NT6, 2019 HC, 2018 WB1, 2017 XD62, 2017 QX34, 2015 RK82, 2015 CU58, 2015 BX310, 2014 HH192, 2012 PW, 2012 BE86, 2010 SD13, 2010 CM, 2006 SK134, 467475
F52Pan-STARRS 2 (PS2) in Hawaii, 3 in MPEC 2019-P96 -- 2019 NX5, 2006 DY, 2004 FF29
C95SATINO-1 in France, 1 in MPEC 2019-P96 -- 2019 MK2
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-P96 -- 2013 CK89
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-P97 -- 2018 WB1
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2019-P96 -- 2019 PJ
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-P96 -- 2019 AO10
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPEC 2019-P96 -- 2019 NW2, 2019 AO10
C51WISE in Earth polar orbit, 3 in MPEC 2019-P96 -- 530743, 468117, 11500
I41Zwicky Transient Facility (ZTF) in southern California, 9 in MPEC 2019-P96 -- 2019 NN4, 2019 JE6, 516986, 430440, 276397, 112221, 7092, 7088, 4487
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 August '19

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2019 NX5JPL Sentry15002067-2115153.36174367e-05-6.76-6.870JPL: Computed at 06:29 today Pacific time based on 24 observations spanning 6.8081 days (2019-Jul-04.543054 to 2019-Jul-11.351181). Diameter approximately 0.005 km. from weighted mean H=29.12.
NEODyS15002067-2118955.2e-05-6.60-7.30NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2019-07-04.544 to 2019-07-11.352."
2019 NW2JPL Sentry1500R E M O V E DJPL: Risk listing removed at 1315 UTC today
NEODyS1500208311.51e-07-7.82-7.820NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2019-07-02.299 to 2019-08-12.596."

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 13 August '19

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

2001Grabbed MPEC 2019-P98 - 2019 PN2 - see above
1740Generated Traffic Report
1500Noted that JPL Sentry has removed 2019 NW2 as an impact risk - see above
Noted that NEODyS has updated its 2019 NW2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 NX5 risk assessment - see above
Noted that NEODyS has updated its 2019 NX5 risk assessment - see above
Grabbed MPEC 2019-P96 - Daily Orbit Update - see above
Grabbed MPEC 2019-P97 - 2018 WB1 - see above