Contents  on 14 August '19

Asteroid/Comet Connection (A/CC) Resources:

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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 14 August '19

Two objects reported inside ten LD

Today there are two asteroids known to be traveling just inside ten lunar distances (LD) of Earth. 2019 PJ comes in from 10.83 to 9.31 LD and 2019 PS1 leaves from 9.67 to 11.85 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
2.01 LD Aug. 9 2019 PS1 15 m  9.67 to 11.85 LD Aug. 5 - today exits ten LD
8.74 LD Aug. 16 2019 PJ 57 m  9.31 from 10.83 LD today - Aug. 17 enters ten LD
Approaching Traffic
2.7   LD Aug. 28* 2019 OU1 91 m  40.0 from 43.0 LD Aug. 25 - 31 Earth passage uncertainty +/- 22 mins.* - DOU

This report was generated at 1812 UTC with first follow-up in today's DOU MPEC for departed 2019 PO1, expanding it's observation arc from 17.30 hours to 3.04 days. This slow passer is calculated with some uncertainty to have remained within ten LD of our planet from June 25th to August 3rd and is suspected to be human space junk or lunar ejecta. The DOU also has follow up for approaching 2019 OU1.

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 14 August '19

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 30 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 14 August '19

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 2019-P103 - "20:26 UT" - 2019 PV2

MPEC 2019-P102 - "12:34 UT" - 2019 PS2

MPEC 2019-P101 - "12:27 UT" - 2019 PR2

MPEC 2019-P100 - "12:22 UT" - 2019 PQ2

<< DOU on 14 August '19 >>  MPEC 2019-P99 - "12:02 UT" - Daily Orbit Update

Observers  on 14 August '19

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2019-P99, 2019-P100 & 2019-P101 -- 2019 PR2, 2019 PQ2, 2019 OV2, 2019 OT1, 2019 OO1, 2019 OJ1, 2019 OA2, 2019 JX6, 2019 HC
160Castelmartini Obs. in Italy, 5 in MPEC 2019-P99 -- 2017 YT5, 68950, 355256, 173561, 12538
Z43Landehen Obs., 1 in MPEC 2019-P99 -- 455432
W92MASTER OAFA Obs., 1 in MPEC 2019-P99 -- 1866
568^R. Wainscoat on Mauna Kea in Hawaii, 3 in MPECs 2019-P101, 2019-P102 & 2019-P103 -- 2019 PV2, 2019 PS2, 2019 PR2
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2019-P99 -- 2005 QS10
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2019-P99, 2019-P100, 2019-P101, 2019-P102 & 2019-P103 -- 2019 PV2, 2019 PS2, 2019 PR2, 2019 PQ2, 450293
C95SATINO-1 in France, 1 in MPEC 2019-P99 -- 2019 OU1 Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-P99 -- 2015 HB10
G40"G. Gasparovic in Croatia via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-P99 -- 11500
G40-program code "-" (22) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-P99 -- 2019 OM1
Y00SONEAR in Brazil, 5 in MPEC 2019-P99 -- 2019 NC1, 2010 PK9, 455432, 214088, 154229
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-P99 -- 2019 PO1
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPEC 2019-P99 -- 2019 PO1, 2019 LR4
L01Visnjan Obs., 1 in MPEC 2019-P101 -- 2019 PR2
I41Zwicky Transient Facility (ZTF) in southern California, 9 in MPEC 2019-P99 -- 2019 PA, 2019 NV, 2019 JE6, 2006 QS23, 532874, 528159, 492143, 18172, 162273
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 PO1JPL Sentry15302059-2115373.76564781e-05-6.01-6.210JPL: Computed at 06:16 today Pacific time based on 17 observations spanning 3.0406 days (2019-Aug-09.53131 to 2019-Aug-12.571914). Diameter approximately 0.009 km. from weighted mean H=27.78.
NEODyS15302066-2109462.39e-06-7.36-8.180NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2019-08-09.532 to 2019-08-12.573."
2019 LR4JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1302 UTC today
NEODyS1530R E M O V E D-

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 14 August '19

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

2210Grabbed MPEC 2019-P103 - 2019 PV2 - see above
1812Generated Traffic Report
1530Noted that JPL Sentry has removed 2019 LR4 as an impact risk - see above
Noted that NEODyS has removed 2019 LR4 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 PO1 risk assessment - see above
Noted that NEODyS has updated its 2019 PO1 risk assessment - see above
Grabbed MPEC 2019-P99 - Daily Orbit Update - see above
Grabbed MPEC 2019-P100 - 2019 PQ2 - see above
Grabbed MPEC 2019-P101 - 2019 PR2 - see above
Grabbed MPEC 2019-P102 - 2019 PS2 - see above