Contents  on 1 September '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 1 September '19

Four objects reported inside ten LD

There are four asteroidal objects known to be traveling within ten lunar distances (LD) of our planet today. None of them are closer than five 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
4.61 LD Aug. 30 2019 QU4 37 m  5.02 to 6.02 LD Aug. 26 - Sept. 4 NHATS target - DOU
5.65 LD tomorrow 2019 QA5 20 m  5.65 from 6.52 LD Aug. 30 - Sept. 4
5.65 LD Aug. 30 2019 QR3 13 m  7.09 to 8.86 LD Aug. 27 - tomorrow risk
5.88 LD Aug. 31 2019 QD4 22 m  5.90 to 8.05 LD Aug. 30 - tomorrow
Approaching Traffic - sorted by 10-LD bubble entry date
2.5   LD Sept. 10* 2019 QY4 9 m  14.3 from 16.0 LD Sept. 4 - 15 *Earth passage uncertainty +/-
1.33 hours, NHATS target
9.69 LD Sept. 9 2019 QZ3 37 m  15.86 from 17.24 LD Sept. 7 - 10 NHATS target

This report was generated at 1955 UTC with follow-up in today's DOU MPEC for outbound 2019 QU4 and for departed risk-listed objects 2019 QE and 2019 PO1.



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 1 September '19

The MPC's NEO Confirmation Page has 75 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 75 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 92 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 1 September '19

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.


MPEC 2019-R07 - "22:02 UT" - 2019 QB7


MPEC 2019-R06 - "12:52 UT" - 2019 QT6


MPEC 2019-R05 - "12:44 UT" - 2019 QS6


MPEC 2019-R04 - "12:40 UT" - 2019 QR6


MPEC 2019-R03 - "12:37 UT" - 2019 QQ6


<< DOU on 1 September '19 >>  MPEC 2019-R02 - "12:05 UT" - Daily Orbit Update


MPEC 2019-R01 - "04:12 UT" - 2019 QO6

Observers  on 1 September '19

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2019-R01 & 2019-R02 -- 2019 QO6, 2019 QK, 2019 QG, 2019 PM2, 2019 PB2, 2019 PA, 2019 OY3, 2019 OP2, 2019 OG, 2019 OB3, 2019 GD3, 2017 BE92, 243025, 18172, 2100, 1865
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2019-R02 -- 2006 SE6
160Castelmartini Obs. in Italy, 11 in MPEC 2019-R02 -- 2019 QV4, 2019 QU4, 2014 QK433, 2010 VW75, 429733, 163760, 12538, 105140, 5786, 2059, 1865
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-R07 -- 2019 QB7
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2019-R01 -- 2019 QO6
734Farpoint Obs. in Kansas, 1 in MPEC 2019-R04 -- 2019 QR6
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-R01 -- 2019 QO6
J95Great Shefford Obs. in England, 2 in MPECs 2019-R02 & 2019-R03 -- 2019 QU4, 2019 QQ6
Z43Landehen Obs., 4 in MPEC 2019-R02 -- 2019 QU4, 2016 NL15, 2013 CK89, 326777
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-R07 -- 2019 QB7
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2019-R01, 2019-R03, 2019-R04, 2019-R05 & 2019-R06 -- 2019 QT6, 2019 QS6, 2019 QR6, 2019 QQ6, 2019 QO6
Z80Northolt Branch Obs. in England, 3 in MPEC 2019-R02 -- 2019 QY5, 2019 PP1, 2016 NL15
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-R02 -- 2010 VW75
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2019-R02 & 2019-R07 -- 2019 QL4, 2019 QB7
H36Sandlot Obs. in Kansas, 3 in MPECs 2019-R01, 2019-R03 & 2019-R04 -- 2019 QR6, 2019 QQ6, 2019 QO6
C95SATINO-1 in France, 1 in MPEC 2019-R02 -- 2019 MV3
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-R02 -- 2019 QE
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2019-R03 & 2019-R04 -- 2019 QR6, 2019 QQ6
I52Steward Obs. Mt. Lemmon Station in Arizona, 6 in MPECs 2019-R02, 2019-R03, 2019-R04, 2019-R05 & 2019-R06 -- 2019 QT6, 2019 QS6, 2019 QR6, 2019 QQ6, 2019 PA3, 2019 OQ4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-R02 -- 2019 PO1
L01Visnjan Obs., 3 in MPECs 2019-R01, 2019-R03 & 2019-R04 -- 2019 QR6, 2019 QQ6, 2019 QO6
C51WISE in Earth polar orbit, 1 in MPEC 2019-R02 -- 2010 KH
I41Zwicky Transient Facility (ZTF) in southern California, 12 in MPEC 2019-R02 -- 2019 PA, 2015 YL10, 2015 RZ35, 2006 MA, 85490, 523972, 467475, 408869, 378610, 369264, 367525, 243025
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 September '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.
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
2019 QEJPL Sentry16002113-211317.590e-07-7.48-7.480JPL: Computed at 06:31 today Pacific time based on 70 observations spanning 12.175 days (2019-Aug-20.29309 to 2019-Sep-01.46815). Diameter approximately 0.013 km. from weighted mean H=27.04.
2019 PO1JPL Sentry16002071-2109204.741768e-05-6.16-6.720JPL: Computed at 06:41 today Pacific time based on 42 observations spanning 21.882 days (2019-Aug-09.53131 to 2019-Aug-31.412976). Diameter approximately 0.008 km. from weighted mean H=28.05.
NEODyS16002077-2117685.45e-05-6.18-6.810NEODyS: "Based on 44 optical observations (of which 2 are rejected as outliers) from 2019-08-09.532 to 2019-08-31.414."

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 1 September '19

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

2236Grabbed MPEC 2019-R07 - 2019 QB7 - see above
1955Generated Traffic Report
1600Noted that JPL Sentry has updated its 2019 PO1 risk assessment - see above
Noted that NEODyS has updated its 2019 PO1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 QE risk assessment - see above
Grabbed MPEC 2019-R02 - Daily Orbit Update - see above
Grabbed MPEC 2019-R03 - 2019 QQ6 - see above
Grabbed MPEC 2019-R04 - 2019 QR6 - see above
Grabbed MPEC 2019-R05 - 2019 QS6 - see above
Grabbed MPEC 2019-R06 - 2019 QT6 - see above
0540Grabbed MPEC 2019-R01 - 2019 QO6 - see above