Contents  on 15 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 15 September '19

Five objects reported inside ten LD

Five asteroidal objects are reported to be less than ten lunar distances (LD) from Earth today, all of them out beyond seven 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  9.98 to 11.65 LD Sept. 3 - 15 exits ten LD, risk - DOU
2.50 LD Sept. 10 2019 QY4 10 m  8.98 to 10.66 LD Sept. 4 - 15 NHATS target, exits ten LD
7.19 LD Sept. 12 2019 RX2 7 m  7.96 to 8.54 LD Sept. 6 - 17
8.4   LD Sept. 20* 2019 RP2 6 m  8.6 from 8.7 LD Sept. 7 - Oct. 4 *Earth passage uncertainty
+/- 41 mins.
9.33 LD yesterday 2019 RQ2 28 m  9.40 to 10.56 LD Sept. 13 - 15 exits ten LD, risk
Approaching Traffic - sorted by 10-LD bubble entry date
7.89 LD Sept. 21 2017 SL16 23 m  10.78 from 11.80 LD tomorrow - Sept. 25 NHATS target
4.22 LD Sept. 26 2017 KP27 23 m  12.15 from 13.16 LD Sept. 18 - Oct. 5 NHATS target - DOU

This report was generated at 1850 UTC with follow-up in today's DOU MPEC for approaching 2017 KP27, outbound risk-listed 2019 RT3, and departed 2019 RW1 (first follow-up, 5.02 days added to 2.63-day discovery arc).

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 15 September '19

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 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 15 September '19

Minor Planet Electronic Circulars

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

<< DOU on 15 September '19 >>  MPEC 2019-R118 - "12:11 UT" - Daily Orbit Update

Observers  on 15 September '19

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2019-R118 -- 2019 RC, 2019 MK2, 2019 GT3, 367525, 340666, 237805, 18172, 112221, 105140, 2059
160Castelmartini Obs. in Italy, 8 in MPEC 2019-R118 -- 2019 PP1, 2010 VW75, 524603, 503960, 467475, 237805, 108906, 2100
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-R118 -- 2016 WX9
K87Dettelbach Vineyard Obs. in Germany, 14 in MPEC 2019-R118 -- 2019 RT3, 2019 RC, 2019 PE2, 2019 GT3, 2015 RZ35, 2010 VW75, 90403, 503960, 455432, 340666, 326777, 237805, 105140, 1865
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-R118 -- 2017 KP27
J95Great Shefford Obs. in England, 1 in MPEC 2019-R118 -- 2019 RT
A17Guidestar Obs. in Germany, 1 in MPEC 2019-R118 -- 2019 RT3
Z43Landehen Obs., 1 in MPEC 2019-R118 -- 326777
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2019-R118 -- 2019 QW3
C95SATINO-1 in France, 1 in MPEC 2019-R118 -- 2019 GT3
204Schiaparelli Obs. in Italy, 12 in MPEC 2019-R118 -- 2019 RW1, 2019 QX, 2019 QV, 2019 QO5, 2019 QE6, 2019 QC6, 2019 GT3, 2017 SN14, 2014 QQ266, 2014 HH192, 2012 PW, 455432
G40,program code "," (21) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R118 -- 2019 GT3
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-R118 -- 2016 WX9
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2019-R118 -- 340666, 105140
I41Zwicky Transient Facility (ZTF) in southern California, 4 in MPEC 2019-R118 -- 2019 QW3, 2019 PA, 2014 XX7, 2006 MA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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.





Notes for Today's Latest Risk Assessments
2019 RV3NEODyS00012026-2118893.53e-07-3.83-4.440NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2019-09-06.605 to 2019-09-11.124."
2019 RT3NEODyS21382075-2118411.35e-04-4.12-4.190NEODyS #2 for the day: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-09-15.126."
JPL Sentry17002075-2117197.2025223e-05-4.39-4.470JPL: Computed at 07:03 today Pacific time based on 73 observations spanning 3.5217 days (2019-Sep-11.603747 to 2019-Sep-15.12549). Diameter approximately 0.032 km. from weighted mean H=25.09.
2019 RQ2NEODyS00012056-210535.69e-07-6.53-6.940NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2019-09-05.334 to 2019-09-14.046."
2018 SD2NEODyS00012065-21181249.26e-05-6.03-6.70NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2018-09-06.328 to 2018-09-23.500."
2014 QF33NEODyS0001R 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 15 September '19

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

2138Noted that NEODyS has updated its 2019 RT3 risk assessment - see above
1850Generated Traffic Report
1700Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Grabbed MPEC 2019-R118 - Daily Orbit Update - see above
0001Noted that NEODyS has removed 2014 QF33 as an impact risk - see above
Noted that NEODyS has updated its 2018 SD2 risk assessment - see above
Noted that NEODyS has updated its 2019 RQ2 risk assessment - see above
Noted that NEODyS has updated its 2019 RT3 risk assessment - see above
Noted that NEODyS has posted 2019 RV3 as an impact risk - see above