Contents  on 31 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 31 August '19

Six objects reported inside ten LD

Six transient natural objects are reported to be less than ten lunar distances (LD) from Earth today. Closest of these is 2019 QU4, which moves away from 4.61 to 5.02 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
1.74 LD Aug. 24 2019 QU3 6 m  9.63 to 11.07 LD Aug. 17 - 31 NHATS target, exits ten LD, risk
2.68 LD Aug. 28 2019 OU1 97 m  7.94 to 10.74 LD Aug. 25 - 31 exits ten LD
4.61 LD yesterday 2019 QU4 37 m  4.61 to 5.02 LD Aug. 26 - Sept. 4 NHATS target - DOU
5.65 LD Sept. 2 2019 QA5 20 m  6.52 from 8.46 LD yesterday - Sept. 4
5.65 LD yesterday 2019 QR3 13 m  5.91 to 7.09 LD Aug. 27 - Sept. 2 risk
5.88 LD today 2019 QD4 22 m  5.88 LD yesterday - Sept. 2 Earth closest at 2152 UTC
Approaching Traffic - sorted by 10-LD bubble entry date
2.5   LD Sept. 10* 2019 QY4 9 m  16.0 from 17.8 LD Sept. 4 - 15 *Earth passage uncertainty +/- 1.33 hours,
NHATS target
9.69 LD Sept. 9 2019 QZ3 37 m  17.24 from 18.67 LD Sept. 7 - 10 NHATS target - DOU

This report was generated at 1842 UTC with the discovery of already departed 2019 QH6 (MPEC), which flew by us at roughly 3.2 LD* on August 20th. Today's DOU MPEC has follow-up for approaching 2019 QZ3, outbound 2019 QU4, and departed objects 2019 QP2 and risk-listed 2019 QE.



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. "LD*" indicates some uncertainty in an object's Earth passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 31 August '19

The MPC's NEO Confirmation Page has 86 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 86 objects listed. Of these, 44 were "one nighters." So far The Tracking News has counted a total of 98 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 31 August '19

Minor Planet Electronic Circulars

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


MPEC 2019-Q153 - "12:43 UT" - 2019 QK6


MPEC 2019-Q152 - "12:41 UT" - 2019 QJ6


MPEC 2019-Q151 - "12:36 UT" - 2019 QH6


MPEC 2019-Q150 - "12:33 UT" - 2019 QG6


MPEC 2019-Q149 - "12:25 UT" - 2019 QF6


MPEC 2019-Q148 - "12:21 UT" - 2019 QE6


MPEC 2019-Q147 - "12:19 UT" - 2019 QD6


MPEC 2019-Q146 - "12:15 UT" - 2019 QC6


<< DOU on 31 August '19 >>  MPEC 2019-Q145 - "12:04 UT" - Daily Orbit Update

Observers  on 31 August '19

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

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2019-Q146 -- 2019 QC6
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2019-Q145, 2019-Q148, 2019-Q149 & 2019-Q152 -- 2019 QY1, 2019 QJ6, 2019 QF6, 2019 QE6, 2019 OO
B88Bigmuskie Obs. in Italy, 1 in MPEC 2019-Q145 -- 481985
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2019-Q145 & 2019-Q149 -- 2019 QV4, 2019 QF6
160Castelmartini Obs. in Italy, 19 in MPEC 2019-Q145 -- 2019 PE2, 2016 PD1, 2016 NL15, 2013 CK89, 2010 VW75, 2001 RW17, 85709, 524603, 503960, 467475, 450160, 424089, 326742, 26166, 248926, 18172, 6455, 3102, 2100
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-Q149 -- 2019 QF6
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-Q146 -- 2019 QC6
010!program code "!" (10) via Caussols Obs., 1 in MPEC 2019-Q145 -- 2013 CK89
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 19 in MPECs 2019-Q145, 2019-Q147, 2019-Q150 & 2019-Q153 -- 2019 QY3, 2019 QW3, 2019 QV, 2019 QP2, 2019 QN1, 2019 QL1, 2019 QK6, 2019 QG6, 2019 QF2, 2019 QD6, 2019 PM2, 2019 PH, 2019 PB2, 2019 OR4, 2019 NX6, 2019 NT6, 2019 NB5, 2019 FV2, 2018 YZ1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2019-Q148, 2019-Q150, 2019-Q151 & 2019-Q152 -- 2019 QJ6, 2019 QH6, 2019 QG6, 2019 QE6
734Farpoint Obs. in Kansas, 1 in MPEC 2019-Q148 -- 2019 QE6
157Frasso Sabino Obs. in Italy, 1 in MPEC 2019-Q145 -- 2019 NJ5
203GiaGa Obs. in Italy, 1 in MPEC 2019-Q148 -- 2019 QE6
A17Guidestar Obs. in Germany, 1 in MPEC 2019-Q145 -- 2002 SQ
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2019-Q147 -- 2019 QD6
V37LCO McDonald Obs. in Texas, 1 in MPEC 2019-Q145 -- 2019 QZ3
568^R. Wainscoat on Mauna Kea in Hawaii, 4 in MPECs 2019-Q147, 2019-Q150, 2019-Q151 & 2019-Q153 -- 2019 QK6, 2019 QH6, 2019 QG6, 2019 QD6
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2019-Q146, 2019-Q148 & 2019-Q152 -- 2019 QJ6, 2019 QE6, 2019 QC6
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2019-Q145 -- 2019 QV4, 2019 QU4, 2100
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2019-Q145, 2019-Q147, 2019-Q150, 2019-Q151 & 2019-Q153 -- 2019 QT4, 2019 QK6, 2019 QH6, 2019 QG6, 2019 QD6
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-Q146 -- 2019 QC6
K63Pascoli Obs. in Italy, 1 in MPEC 2019-Q145 -- 2019 GD3
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-Q146 -- 2019 QC6
H36Sandlot Obs. in Kansas, 2 in MPECs 2019-Q148 & 2019-Q149 -- 2019 QF6, 2019 QE6
C95SATINO-1 in France, 1 in MPEC 2019-Q145 -- 2016 PX66
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-Q145 -- 2017 FE65
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2019-Q145 -- 2019 QW2, 2019 QE, 2019 PY, 2019 LX4, 2010 OP1
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2019-Q145 & 2019-Q146 -- 2019 QC6, 2019 PA
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2019-Q146, 2019-Q148 & 2019-Q149 -- 2019 QF6, 2019 QE6, 2019 QC6
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2019-Q148, 2019-Q149 & 2019-Q152 -- 2019 QJ6, 2019 QF6, 2019 QE6
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2019-Q145 -- 355256
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2019-Q145 -- 2019 AH11, 2016 CA32, 2001 QE96
L01Visnjan Obs., 4 in MPECs 2019-Q146, 2019-Q148, 2019-Q149 & 2019-Q152 -- 2019 QJ6, 2019 QF6, 2019 QE6, 2019 QC6
I41Zwicky Transient Facility (ZTF) in southern California, 14 in MPEC 2019-Q145 -- 2019 PA, 2015 YL10, 2006 MA, 2001 YM4, 90403, 492143, 467475, 441825, 438661, 367525, 326777, 293054, 276397, 243025
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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.
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 QD6JPL Sentry16002023-2118934.099152e-07-4.62-5.090JPL: Computed at 06:48 today Pacific time based on 14 observations spanning 2.0020 days (2019-Aug-28.53236 to 2019-Aug-30.534357). Diameter approximately 0.152 km. from weighted mean H=21.72.
NEODyS16002023-2115751.51e-07-5.21-6.070NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2019-08-28.533 to 2019-08-30.535."
2019 QEJPL Sentry16002113-211317.445e-07-7.49-7.490JPL: Computed at 06:47 today Pacific time based on 67 observations spanning 10.196 days (2019-Aug-20.29309 to 2019-Aug-30.4895). Diameter approximately 0.013 km. from weighted mean H=27.04.
NEODyS1600211313.25e-07-7.85-7.850NEODyS: "Based on 69 optical observations (of which 2 are rejected as outliers) from 2019-08-20.294 to 2019-08-30.490."

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 31 August '19

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

1842Generated Traffic Report
1600Noted that JPL Sentry has posted 2019 QD6 as an impact risk - see above
Noted that NEODyS has posted 2019 QD6 as an impact risk - see above
Noted that JPL Sentry has reposted 2019 QE as an impact risk - see above
Noted that NEODyS has updated its 2019 QE risk assessment - see above
Grabbed MPEC 2019-Q145 - Daily Orbit Update - see above
Grabbed MPEC 2019-Q146 - 2019 QC6 - see above
Grabbed MPEC 2019-Q147 - 2019 QD6 - see above
Grabbed MPEC 2019-Q148 - 2019 QE6 - see above
Grabbed MPEC 2019-Q149 - 2019 QF6 - see above
Grabbed MPEC 2019-Q150 - 2019 QG6 - see above
Grabbed MPEC 2019-Q151 - 2019 QH6 - see above
Grabbed MPEC 2019-Q152 - 2019 QJ6 - see above
Grabbed MPEC 2019-Q153 - 2019 QK6 - see above