Contents  on 16 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 16 September '19

Three objects reported inside ten LD

Three small celestial objects are reported within ten lunar distances (LD) of our planet today, all well beyond eight LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
7.19 LD Sept. 12 2019 RX2 7 m  8.54 to 9.24 LD Sept. 6 - 17
7.89 LD Sept. 21 2017 SL16 23 m  9.86 from 10.78 LD today - Sept. 25 NHATS target, enters ten LD
8.4   LD Sept. 20* 2019 RP2 6 m  8.6 from 8.6 LD Sept. 7 - Oct. 4 *Earth passage uncertainty
+/- 41 mins.
Approaching Traffic
4.22 LD Sept. 26 2017 KP27 23 m  11.16 from 12.15 LD Sept. 18 - Oct. 5 NHATS target

This report was generated at 1910 UTC with the discovery of long departed risk-listed intruder 2019 QR8, which passed Earth at roughly 0.8 LD on August 26th (uncertainty +/- 1.13 hours), and with follow-up intoday's DOU MPEC for departed objects 2019 RH, Moon-buzzer 2019 RG2, and risk-listed 2019 RT3, plus astrometry from last September for risk-listed 2018 RF5.



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. "Moon buzzer" is used here to describe an object that passed the Moon at less than one Earth-Moon distance but did not intrude into the Earth-Moon system during the reported passage. 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 16 September '19

The MPC's NEO Confirmation Page has 22 listings

When last checked at 1953 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 32 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 16 September '19

Minor Planet Electronic Circulars

As of last check at 1953 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S05 - "15:14 UT" - 2019 RY3


<< DOU on 16 September '19 >>  MPEC 2019-S04 - "12:11 UT" - Daily Orbit Update


MPEC 2019-S03 - "11:42 UT" - Comet C/2019 Q4 (Borisov)


MPEC 2019-S02 - "10:12 UT" - 2019 QR8


MPEC 2019-S01 - "08:48 UT" - 2019 RX3

Observers  on 16 September '19

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

CodeObserver / observatory
C97Al-Fulaij Obs., 4 in MPEC 2019-S04 -- 2019 GT3, 355256, 326777, 237805
H21Astronomical Research Obs. Westfield in Illinois, 27 in MPECs 2019-S01, 2019-S04 & 2019-S05 -- 2019 RY3, 2019 RY2, 2019 RX3, 2019 RV1, 2019 RH, 2019 RG2, 2019 RC, 2019 QO5, 2019 QC1, 2019 PE2, 2019 MK2, 2019 JP2, 2019 GT3, 2015 RZ35, 2010 UH7, 2001 QC34, 90403, 85709, 367525, 340666, 237805, 18172, 105140, 9202, 2100, 2059, 1865
B88Bigmuskie Obs. in Italy, 2 in MPEC 2019-S04 -- 2019 GT3, 237805
B96Brixiis Obs. in Belgium, 1 in MPEC 2019-S03 -- C/2019 Q4
160Castelmartini Obs. in Italy, 7 in MPEC 2019-S04 -- 2019 GT3, 2015 RZ35, 340666, 163760, 105140, 2059, 1865
470Ceccano Obs. in Italy, 1 in MPEC 2019-S03 -- C/2019 Q4
A77Chante-Perdrix Obs. in France, 1 in MPEC 2019-S03 -- C/2019 Q4
970Chelmsford Obs. in England, 1 in MPEC 2019-S03 -- C/2019 Q4
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-S04 -- 2018 RF5
734Farpoint Obs. in Kansas, 1 in MPEC 2019-S05 -- 2019 RY3
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-S03 -- C/2019 Q4
E89Geyserland Obs. in New Zealand, 1 in MPEC 2019-S04 -- 111253
203GiaGa Obs. in Italy, 2 in MPEC 2019-S04 -- 2019 GT3, 237805
J95Great Shefford Obs. in England, 5 in MPECs 2019-S01, 2019-S03 & 2019-S04 -- 2019 RX3, 2019 RV, 2019 RT3, 2019 RT, C/2019 Q4
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-S03 -- C/2019 Q4
Z43Landehen Obs., 1 in MPEC 2019-S04 -- 237805
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-S05 -- 2019 RY3
C10Maisoncelles Obs. in France, 1 in MPEC 2019-S03 -- C/2019 Q4
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-S02 -- 2019 QR8
213Montcabre Obs. in Spain, 1 in MPEC 2019-S03 -- C/2019 Q4
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-S05 -- 2019 RY3
C53NEOSSat in Earth orbit, 1 in MPEC 2019-S03 -- C/2019 Q4
Z80Northolt Branch Obs. in England, 3 in MPECs 2019-S03 & 2019-S04 -- C/2019 Q4, 2019 GT3, 237805
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2019-S01 & 2019-S02 -- 2019 RX3, 2019 QR8
B49Paus Obs. in Spain, 1 in MPEC 2019-S04 -- 2019 QC1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-S03 -- C/2019 Q4
C95SATINO-1 in France, 2 in MPECs 2019-S03 & 2019-S04 -- C/2019 Q4, 2019 LK5
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S03 -- C/2019 Q4
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-S05 -- 2019 RY3
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-S03 -- C/2019 Q4
461SZTE Asteroid Program in Hungary, 1 in MPEC 2019-S03 -- C/2019 Q4
A16Tentlingen Obs. in Switzerland, 2 in MPEC 2019-S04 -- 326777, 162082
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-S04 -- 2018 NN4, 2018 KV
L01Visnjan Obs., 4 in MPECs 2019-S01, 2019-S04 & 2019-S05 -- 2019 RY3, 2019 RX3, 2019 GT3, 2006 KE
367Yatsuka Obs. in Japan, 1 in MPEC 2019-S03 -- C/2019 Q4
I41Zwicky Transient Facility (ZTF) in southern California, 11 in MPEC 2019-S04 -- 2019 PA, 467475, 442243, 369264, 367525, 348461, 334412, 326742, 243025, 20826, 162273
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 1953 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 RX3JPL Sentry15302064-211528.898e-09-6.68-6.860JPL: Computed at 03:58 today Pacific time based on 14 observations spanning 4.4458 days (2019-Sep-11.39731 to 2019-Sep-15.843098). Diameter approximately 0.145 km. from weighted mean H=21.86.
2019 RT3JPL Sentry15302075-2115177.156897e-05-4.40-4.480JPL: Computed at 06:34 today Pacific time based on 76 observations spanning 3.5217 days (2019-Sep-11.603747 to 2019-Sep-15.12549). Diameter approximately 0.032 km. from weighted mean H=25.11.
NEODyS15302063-2118431.37e-04-4.13-4.20NEODyS: "Based on 76 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-09-15.126."
2019 QR8JPL Sentry15302105-210533.5472e-07-8.11-8.330JPL: Computed at 04:30 today Pacific time based on 7 observations spanning 1.0504 days (2019-Aug-28.57377 to 2019-Aug-29.624216). Diameter approximately 0.008 km. from weighted mean H=28.03.
NEODyS1530209015.97e-09-9.81-9.810NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2019-08-28.575 to 2019-08-29.625."
2018 SN3NEODyS1530R E M O V E D-
2018 RF5JPL Sentry15302103-211538.392e-06-6.54-6.650JPL: Computed at 06:29 today Pacific time based on 55 observations spanning 9.2061 days (2018-Sep-10.09301 to 2018-Sep-19.299119). Diameter approximately 0.011 km. from weighted mean H=27.36.
NEODyS15302103-211531.32e-05-6.37-6.560NEODyS: "Based on 55 optical observations (of which 0 are rejected as outliers) from 2018-09-10.094 to 2018-09-19.300."

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 16 September '19

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

1910Generated Traffic Report
1530Noted that JPL Sentry has updated its 2018 RF5 risk assessment - see above
Noted that NEODyS has updated its 2018 RF5 risk assessment - see above
Noted that NEODyS has removed 2018 SN3 as an impact risk - see above
Noted that JPL Sentry has posted 2019 QR8 as an impact risk - see above
Noted that NEODyS has posted 2019 QR8 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Noted that NEODyS has updated its 2019 RT3 risk assessment - see above
Noted that JPL Sentry has posted 2019 RX3 as an impact risk - see above
Grabbed MPEC 2019-S01 - 2019 RX3 - see above
Grabbed MPEC 2019-S02 - 2019 QR8 - see above
Grabbed MPEC 2019-S03 - Comet C/2019 Q4 (Borisov) - see above
Grabbed MPEC 2019-S04 - Daily Orbit Update - see above
Grabbed MPEC 2019-S05 - 2019 RY3 - see above