Contents  on 13 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 13 September '19

Six objects reported inside ten LD

Six transient natural objects are reported within ten lunar distances (LD) of our planet today, none of them closer than 5.7 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
1.45 LD Sept. 9 2019 RT3 32 m  6.65 to 8.31 LD Sept. 3 - 15 NEW, risk - MPEC
2.50 LD Sept. 10 2019 QY4 10 m  5.71 to 7.32 LD Sept. 4 - 15 NHATS target
4.52 LD Sept. 7 2019 RA 28 m  8.60 to 9.70 LD Aug. 31 - tomorrow NHATS target - DOU
7.19 LD yesterday 2019 RX2 7 m  7.26 to 7.53 LD Sept. 6 - 17
8.4   LD Sept. 20* 2019 RP2 6 m  8.8 from 9.0 LD Sept. 7 - Oct. 4 *Earth passage uncertainty
+/- 41 mins.
9.33 LD tomorrow 2019 RQ2 28 m  9.73 from 11.44 LD today - Sept. 15 enters ten LD, risk
Approaching Traffic - sorted by 10-LD bubble entry date
7.89 LD Sept. 21 2017 SL16 23 m  12.90 from 14.06 LD Sept. 16 - 25 NHATS target
4.22 LD Sept. 26 2017 KP27 23 m  14.18 from 15.21 LD Sept. 18 - Oct. 5 NHATS target

This report was generated at 1750 UTC with the discovery of outbound 2019 RT3 (MPEC), which went by us at 1.45 LD on September 9th, and with follow-up in today's DOU MPEC for outbound 2019 RA.



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 object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 13 September '19

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2318 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 35 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 13 September '19

Minor Planet Electronic Circulars

As of last check at 2318 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-R113 - "15:00 UT" - Comet C/2019 Q4 (Borisov)


<< DOU on 13 September '19 >>  MPEC 2019-R112 - "12:09 UT" - Daily Orbit Update


MPEC 2019-R111 - "02:55 UT" - 2019 RT3

Observers  on 13 September '19

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2019-R113 -- C/2019 Q4
A44Altschwendt Obs. in Austria, 1 in MPEC 2019-R111 -- 2019 RT3
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2019-R111 & 2019-R112 -- 2019 RT3, 2019 RA
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-R111 -- 2019 RT3
A77Chante-Perdrix Obs. in France, 1 in MPEC 2019-R113 -- C/2019 Q4
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-R111 & 2019-R113 -- 2019 RT3, C/2019 Q4
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2019-R113 -- C/2019 Q4
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2019-R112 -- 105140
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-R111 -- 2019 RT3
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2019-R113 -- C/2019 Q4
L34Galhassin Robotic Telescope, 14 in MPECs 2019-R111 & 2019-R112 -- 2019 RT3, 2010 VW75, 2001 QC34, 442243, 326742, 248926, 18172, 141593, 140333, 105140, 6455, 2100, 2059, 1865
203GiaGa Obs. in Italy, 1 in MPEC 2019-R111 -- 2019 RT3
K88GINOP-KHK in Hungary, 1 in MPEC 2019-R111 -- 2019 RT3
J95Great Shefford Obs. in England, 1 in MPEC 2019-R111 -- 2019 RT3
238Grorudalen Obs. in Norway, 1 in MPEC 2019-R112 -- 450160
H06%Ernesto Guido in Italy via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-R113 -- C/2019 Q4
K85Kelmis Obs., 2 in MPEC 2019-R112 -- 237805, 1620
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2019-R112 -- 2019 RC2
K38M57 Obs. in Italy, 3 in MPECs 2019-R111 & 2019-R112 -- 2019 RT3, 2019 RC, 2019 QC1
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2019-R112 -- 248926
C653program code 3 via Montsec Obs. in Spain, 1 in MPEC 2019-R113 -- C/2019 Q4
675@program code "@" (41) via Mount Palomar in southern California, 1 in MPEC 2019-R113 -- C/2019 Q4
Z80Northolt Branch Obs. in England, 1 in MPEC 2019-R112 -- 237805
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-R113 -- C/2019 Q4
C95SATINO-1 in France, 2 in MPECs 2019-R112 & 2019-R113 -- C/2019 Q4, 2009 QB36
204Schiaparelli Obs. in Italy, 2 in MPECs 2019-R111 & 2019-R113 -- 2019 RT3, C/2019 Q4
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2019-R112 -- 3753
587Sormano Obs. in Italy, 1 in MPEC 2019-R113 -- C/2019 Q4
L06Sormano2 Obs. in Italy, 1 in MPEC 2019-R113 -- C/2019 Q4
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-R111 -- 2019 RT3
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-R113 -- C/2019 Q4
954Teide Obs. in the Canary Islands, 2 in MPECs 2019-R112 & 2019-R113 -- C/2019 Q4, 90403
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-R112 -- 2015 FV118
L01Visnjan Obs., 2 in MPECs 2019-R111 & 2019-R113 -- 2019 RT3, C/2019 Q4
718Wiggins Obs. in Utah, 1 in MPEC 2019-R112 -- 2019 RC
I41Zwicky Transient Facility (ZTF) in southern California, 9 in MPEC 2019-R112 -- 2019 PA, 2006 MA, 467475, 458745, 442243, 441825, 367525, 248926, 243025
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2319 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 RT3NEODyS15302075-2118431.16e-04-4.22-4.320NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-09-13.058."
JPL Sentry04322075-2115186.78326254e-05-4.43-4.510JPL: Computed at 21:03 Sept. 12th Pacific time based on 65 observations spanning 1.4535 days (2019-Sep-11.603747 to 2019-Sep-13.05728). Diameter approximately 0.032 km. from weighted mean H=25.13.
2019 RC2JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1334 UTC today
NEODyS1530R E M O V E D-
2008 EM68JPL Sentry04322019-211610931.08485801e-05-5.58-6.250JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

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 13 September '19

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

1750Generated Traffic Report
1530Noted that JPL Sentry has removed 2019 RC2 as an impact risk - see above
Noted that NEODyS has removed 2019 RC2 as an impact risk - see above
Noted that NEODyS has posted 2019 RT3 as an impact risk - see above
Grabbed MPEC 2019-R112 - Daily Orbit Update - see above
Grabbed MPEC 2019-R113 - Comet C/2019 Q4 (Borisov) - see above
0432Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has posted 2019 RT3 as an impact risk - see above
0336Grabbed MPEC 2019-R111 - 2019 RT3 - see above