Contents  on 10 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 10 August '19

Two objects reported inside ten LD

Two asteroids are reported to be less than ten lunar distances (LD) from Earth today, with the closest, 2019 PT, headed out from 7.89 to 9.07 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
4.49 LD Aug. 5 2019 PT 22 m  7.89 to 9.07 LD July 29 - tomorrow
8.31 LD Aug. 7 2019 PU 23 m  9.18 to 9.84 LD Aug. 3 - 11
Approaching Traffic - sorted by 10-LD bubble entry date
8.7   LD Aug. 16* 2019 PJ 56 m  18.2 from 21.1 LD Aug. 14 - 17 EPU +/- 30 mins.*
2.7   LD Aug. 28* 2019 OU1 89 m  52.5 from 55.6 LD Aug. 25 - 31 EPU +/- 1.60 hours*
*EPU = Earth passage uncertainty

This report was updated at 2135 UTC with the discovery of departed risk-listed 2019 PO1 (MPEC), which apparently was inside ten LD for all of July, passing our planet at about 7.3 LD around July 14th (+/-1.428 days uncertainty). Your first neighborhood flying rocks traffic report was generated at 1712 UTC with the discovery announced late yesterday of just departed 2019 PH1 (MPEC), which flew by us at 2.06 LD on August 7th.

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 10 August '19

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 58 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 10 August '19

Minor Planet Electronic Circulars

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

MPEC 2019-P77 - "19:35 UT" - 2019 PP1

MPEC 2019-P76 - "19:19 UT" - 2019 PO1

<< DOU on 10 August '19 >>  MPEC 2019-P75 - "13:34 UT" - Daily Orbit Update

MPEC 2019-P74 - "03:00 UT" - 2019 PJ1

Observers  on 10 August '19

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2019-P76 -- 2019 PO1
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2019-P75 -- 2019 ND7
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-P77 -- 2019 PP1
I47Auger Obs. in Argentina, 1 in MPEC 2019-P77 -- 2019 PP1
Z36Cancelada Obs., 1 in MPEC 2019-P75 -- 153842
160Castelmartini Obs. in Italy, 8 in MPEC 2019-P75 -- 2019 OJ1, 2017 YT5, 68950, 455432, 355256, 27346, 173561, 12538
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2019-P77 -- 2019 PP1
238Grorudalen Obs. in Norway, 1 in MPEC 2019-P75 -- 3200
W92MASTER OAFA Obs., 1 in MPEC 2019-P75 -- 137170
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2019-P74 & 2019-P76 -- 2019 PO1, 2019 PJ1
F52Pan-STARRS 2 (PS2) in Hawaii, 2 in MPECs 2019-P74 & 2019-P75 -- 2019 PJ1, 2015 RH2
104San Marcello Pistoiese Obs. in Italy, 3 in MPEC 2019-P75 -- 2019 OW3, 2019 OM, 2019 GD3
C95SATINO-1 in France, 1 in MPEC 2019-P75 -- 2019 OJ1
W88!W.F. Cashwell in Nevada via Chile Obs. in Chile, 1 in MPEC 2019-P77 -- 2019 PP1
I33SOAR in Chile, 1 in MPEC 2019-P75 -- 2018 RY7
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2019-P75 -- 90403, 355256
A16Tentlingen Obs. in Switzerland, 3 in MPEC 2019-P75 -- 2017 YT5, 173561, 153842
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-P75 -- 2007 EF
L01Visnjan Obs., 2 in MPECs 2019-P74 & 2019-P76 -- 2019 PO1, 2019 PJ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 Sentry21082054-2104115.729884e-07-7.96-8.250JPL: Computed at 13:39 today Pacific time based on 11 observations spanning .72078 days (2019-Aug-09.53131 to 2019-Aug-10.252086). Diameter approximately 0.009 km. from weighted mean H=27.77.
2019 ND7JPL Sentry17002097-2117203.176057e-06-3.67-4.380JPL: Computed at 08:11 today Pacific time based on 34 observations spanning 12.871 days (2019-Jul-07.587668 to 2019-Jul-20.458285). Diameter approximately 0.180 km. from weighted mean H=21.42.

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 10 August '19

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

2135Updated Traffic Report
2108Noted that JPL Sentry has posted 2019 PO1 as an impact risk - see above
2001Grabbed MPEC 2019-P77 - 2019 PP1 - see above
1934Grabbed MPEC 2019-P76 - 2019 PO1 - see above
1700Noted that JPL Sentry has updated its 2019 ND7 risk assessment - see above
1500Grabbed MPEC 2019-P75 - Daily Orbit Update - see above
0320Grabbed MPEC 2019-P74 - 2019 PJ1 - see above