Contents  on 7 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 7 September '19

Nine objects reported inside ten LD

There are nine visitors reported within ten lunar distances (LD) of our home world today. Nearest is intruder 2019 RC1, which comes its closest on this passage, reaching 0.48 LD. Nothing else is closer than four 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
0.10 LD Sept. 5 2019 RP1 9 m  6.20 to 11.92 LD Sept. 4 - 7 NEW, intruder, exits ten LD - MPEC, DOU
0.48 LD today 2019 RC1 6 m  0.48 LD Sept. 5 - 9 intruder today, Moon closest 1.06 LD at 0918 UTC,
Earth closest at 1047 UTC - DOU
2.50 LD Sept. 10 2019 QY4 9 m  4.36 from 5.87 LD Sept. 4 - 15 NHATS target
3.53 LD Sept. 4 2019 RF1 5 m  4.89 to 5.90 LD Aug. 28 - Sept. 11
3.83 LD Sept. 2 2019 RE1 6 m  8.76 to 10.31 LD Aug. 27 - today exits ten LD
4.52 LD today 2019 RA 28 m  4.52 LD Aug. 31 - Sept. 14 NHATS target, Earth closest at 0655 UTC - DOU
6.11 LD yesterday 2019 RD1 14 m  6.29 to 6.85 LD Sept. 1 - 11
8.1   LD Sept. 5* 2019 RM1 9 m  8.3 to 8.9 LD Sept. 2 - 9 *Earth passage uncertainty +/- 6 mins., NHATS target
9.69 LD Sept. 9 2019 QZ3 39 m  9.98 from 10.52 LD today - Sept. 10 NHATS target, enters ten LD - DOU
Approaching Traffic
6.96 LD Sept. 10 2019 RH 21 m  11.32 from 14.50 LD tomorrow - Sept. 12 DOU

This report was generated at 1820 UTC with the discoveries of outbound intruder 2019 RP1 (MPEC, DOU), which on September 5th flew by us at 0.099 LD, and past the Moon at 0.85 LD, and already departed 2019 RO1 (MPEC), which went by at 7.29 LD on September 4th. Today's DOU MPEC has follow-up for approaching 2019 RH, inbound 2019 QZ3, and passing objects 2019 RA and intruder 2019 RC1.



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 7 September '19

The MPC's NEO Confirmation Page has 108 listings

When last checked at 2330 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 108 objects listed. Of these, 46 were "one nighters." So far The Tracking News has counted a total of 117 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 7 September '19

Minor Planet Electronic Circulars

As of last check at 2330 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 7 September '19 >>  MPEC 2019-R62 - "12:06 UT" - Daily Orbit Update


MPEC 2019-R61 - "08:35 UT" - 2016 TS92


MPEC 2019-R60 - "08:34 UT" - 2014 DJ23


MPEC 2019-R59 - "05:36 UT" - 2019 RQ1


MPEC 2019-R58 - "05:34 UT" - 2019 RP1


MPEC 2019-R57 - "05:31 UT" - 2019 RO1


MPEC 2019-R56 - "05:25 UT" - 2019 RN1

Observers  on 7 September '19

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2019-R56, 2019-R57, 2019-R58, 2019-R59 & 2019-R62 -- 2019 RQ1, 2019 RP1, 2019 RO1, 2019 RN1, 2019 RB1, 2019 GT3
Z36Cancelada Obs., 2 in MPEC 2019-R62 -- 405212, 401857
160Castelmartini Obs. in Italy, 14 in MPEC 2019-R62 -- 2019 RA, 2019 GT3, 2015 RZ35, 2013 CK89, 2010 VW75, 523605, 355256, 340666, 247517, 163760, 12538, 105140, 2059, 1865
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-R58 -- 2019 RP1
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-R56 -- 2019 RN1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-R62 -- 2019 RC
Z45Cosmos Obs., 2 in MPEC 2019-R62 -- 405212, 401857
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-R62 -- 2019 DW1
734Farpoint Obs. in Kansas, 2 in MPEC 2019-R62 -- 2019 RY, 2019 RK
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-R58 -- 2019 RP1
J95Great Shefford Obs. in England, 2 in MPECs 2019-R58 & 2019-R62 -- 2019 RP1, 2019 RC1
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-R58 -- 2019 RP1
711McDonald Obs. in Texas, 8 in MPEC 2019-R62 -- 2019 RP1, 2019 QV3, 2019 QO6, 2019 QN1, 2019 QE6, 2019 QB2, 2019 QA2, 2019 MX3
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2019-R56, 2019-R57 & 2019-R59 -- 2019 RQ1, 2019 RO1, 2019 RN1
J69North Obs. in England, 4 in MPEC 2019-R62 -- 2019 RC1, 2019 RA, 2019 QZ3, 2019 GT3
Z80Northolt Branch Obs. in England, 2 in MPEC 2019-R62 -- 2019 RA, 237805
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2019-R62 -- 2100
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2019-R56 & 2019-R62 -- 2019 RN1, 2019 QZ
W34Squirrel Valley Obs. in North Carolina, 3 in MPEC 2019-R62 -- 2019 GD3, 237805, 162082
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2019-R58 -- 2019 RP1
I52Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPECs 2019-R57, 2019-R59 & 2019-R62 -- 2019 RZ, 2019 RU, 2019 RT, 2019 RQ1, 2019 RO1, 2019 RH, 2019 RB1, 2019 RA, 2019 QZ3, 2019 QW4, 2019 QT5, 2019 QO6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPECs 2019-R60, 2019-R61 & 2019-R62 -- 2019 RJ1, 2019 QV7, 2016 TS92, 2014 DJ23
L01Visnjan Obs., 3 in MPECs 2019-R57, 2019-R58 & 2019-R59 -- 2019 RQ1, 2019 RP1, 2019 RO1
C51WISE in Earth polar orbit, 1 in MPEC 2019-R62 -- 141593
I41Zwicky Transient Facility (ZTF) in southern California, 8 in MPEC 2019-R62 -- 2019 PA, 2015 RZ35, 2014 XX7, 367525, 276397, 230118, 112221, 7088
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2330 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 RQ1JPL Sentry15302045-211185.007897e-07-5.24-5.270JPL: Computed at 00:01 today Pacific time based on 18 observations spanning 1.5193 days (2019-Sep-05.40112 to 2019-Sep-06.920385). Diameter approximately 0.053 km. from weighted mean H=24.03.
NEODyS15302050-207736.28e-08-6.48-6.520NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2019-09-05.402 to 2019-09-06.921."
2019 RJ1NEODyS1530R E M O V E D-
JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1329 UTC today
2019 RTJPL Sentry1530R E M O V E DJPL: Risk listing removed at 1330 UTC today
2019 QV7JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1330 UTC today
NEODyS1530211512.92e-10-7.78-7.780NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2019-08-30.381 to 2019-09-06.589."
2019 DW1NEODyS1530R 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 7 September '19

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

1820Generated Traffic Report
1530Noted that NEODyS has removed 2019 DW1 as an impact risk - see above
Noted that JPL Sentry has removed 2019 QV7 as an impact risk - see above
Noted that NEODyS has updated its 2019 QV7 risk assessment - see above
Noted that JPL Sentry has removed 2019 RJ1 as an impact risk - see above
Noted that NEODyS has removed 2019 RJ1 as an impact risk - see above
Noted that JPL Sentry has posted 2019 RQ1 as an impact risk - see above
Noted that NEODyS has posted 2019 RQ1 as an impact risk - see above
Noted that JPL Sentry has removed 2019 RT as an impact risk - see above
Grabbed MPEC 2019-R56 - 2019 RN1 - see above
Grabbed MPEC 2019-R57 - 2019 RO1 - see above
Grabbed MPEC 2019-R58 - 2019 RP1 - see above
Grabbed MPEC 2019-R59 - 2019 RQ1 - see above
Grabbed MPEC 2019-R60 - 2014 DJ23 - see above
Grabbed MPEC 2019-R61 - 2016 TS92 - see above
Grabbed MPEC 2019-R62 - Daily Orbit Update - see above