Contents  on 17 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 17 September '19

Three objects reported inside ten LD

There are three transient natural objects reported inside ten lunar distances (LD) of Earth today. All are out past 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  9.24 to 10.02 LD Sept. 6 - today exits ten LD
7.89 LD Sept. 21 2017 SL16 23 m  9.07 from 9.86 LD yesterday - Sept. 25 NHATS target
8.4   LD Sept. 20* 2019 RP2 6 m  8.5 from 8.6 LD Sept. 7 - Oct. 4 *Earth passage uncertainty
+/- 41 mins.
Approaching Traffic
4.22 LD Sept. 26 2017 KP27 23 m  10.19 from 11.16 LD tomorrow - Oct. 5 NHATS target

This report was generated at 1740 UTC with follow-up in today's DOU MPEC for departed objects 2019 RW1, 2019 RA, and 2019 QZ3.

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 17 September '19

The MPC's NEO Confirmation Page has 28 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 28 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 36 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 17 September '19

Minor Planet Electronic Circulars

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

<< DOU on 17 September '19 >>  MPEC 2019-S07 - "12:09 UT" - Daily Orbit Update

MPEC 2019-S06 - "06:45 UT" - 2019 RZ3

Observers  on 17 September '19

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPEC 2019-S07 -- 2019 RH1, 2019 RC, 2019 RA, 2019 QZ3, 2019 QK4, 2019 QD2, 2019 PW1, 2019 PP1, 2019 PE2, 2019 JP2, 2019 GT3, 2015 RZ35, 2010 UH7, 2001 QC34, 90403, 85709, 237805, 2100, 1865
160Castelmartini Obs. in Italy, 6 in MPEC 2019-S07 -- 2015 RZ35, 355256, 163760, 105140, 2059, 1865
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-S06 -- 2019 RZ3
W845Lori Allen via DECam in Chile, 1 in MPEC 2019-S07 -- 2017 CQ
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-S06 -- 2019 RZ3
Z80Northolt Branch Obs. in England, 3 in MPEC 2019-S07 -- 2019 GT3, 2015 RZ35, 237805
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2019-S07 -- 2019 KP, 2012 PW, 2006 DY, 53110, 481985, 331999, 18172, 112221
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPEC 2019-S07 -- 2015 VL142, 2012 VN7, 162723, 11885, 3102
K63Pascoli Obs. in Italy, 8 in MPEC 2019-S07 -- 2015 RZ35, 2015 PC228, 481985, 367525, 326742, 248926, 237805, 18172
C95SATINO-1 in France, 1 in MPEC 2019-S07 -- 2019 PA
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2019-S07 -- 2019 RY, 2019 RW1, 2019 RK, 2019 RB3, 2019 QY3
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2019-S07 -- 2019 RW, 2019 RV3, 2019 RQ1, 2019 RO2, 2019 OQ2, 2007 TQ24
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2019-S07 -- 2019 PE2, 163760
I52Steward Obs. Mt. Lemmon Station in Arizona, 11 in MPEC 2019-S07 -- 2019 RU1, 2019 RS2, 2019 RR1, 2019 RE2, 2019 QW4, 2019 QT5, 2019 QO6, 2019 QM5, 2019 QL4, 2019 QC7, 2019 QB2
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2019-S07 -- 326777
Z52The Studios Obs., 1 in MPEC 2019-S07 -- 2059
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-S07 -- 2017 YN6
I15Wishing Star Obs. in Rhode Island, 8 in MPEC 2019-S07 -- 2019 QC1, 99248, 503960, 492143, 340666, 326777, 105140, 2059
I41Zwicky Transient Facility (ZTF) in southern California, 10 in MPEC 2019-S07 -- 2019 QW3, 2019 PA, 2019 LE5, 2006 MA, 2006 KE, 441825, 334412, 248926, 18172, 143527
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 RV3JPL Sentry15302064-211474.53518e-08-4.84-5.250JPL: Computed at 06:31 today Pacific time based on 16 observations spanning 10.824 days (2019-Sep-06.6042 to 2019-Sep-17.42822). Diameter approximately 0.390 km. from weighted mean H=19.70.
NEODyS15302064-2116151.38e-07-4.36-4.830NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2019-09-06.605 to 2019-09-17.429."
2019 RO2JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1329 UTC today
NEODyS1530210412.86e-08-8.00-8.00NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2019-09-06.417 to 2019-09-17.369."
2019 RQ1JPL Sentry15302077-207712.487e-08-6.88-6.880JPL: Computed at 06:30 today Pacific time based on 21 observations spanning 11.996 days (2019-Sep-05.40112 to 2019-Sep-17.39676). Diameter approximately 0.052 km. from weighted mean H=24.09.
2019 RWJPL Sentry1530R E M O V E DJPL: Risk listing removed at 1330 UTC today
2019 ODNEODyS1530R E M O V E D-
2018 FE3NEODyS15302090-211826.18e-06-6.73-6.740NEODyS: "Based on 60 optical observations (of which 3 are rejected as outliers) from 2018-03-21.272 to 2018-04-13.316."
2016 TY55NEODyS15302074-2118491.52e-05-6.13-6.650NEODyS: "Based on 48 optical observations (of which 3 are rejected as outliers) from 2016-10-10.374 to 2016-10-19.445."

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 17 September '19

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

1740Generated Traffic Report
1530Noted that NEODyS has updated its 2016 TY55 risk assessment - see above
Noted that NEODyS has updated its 2018 FE3 risk assessment - see above
Noted that NEODyS has removed 2019 OD as an impact risk - see above
Noted that JPL Sentry has removed 2019 RO2 as an impact risk - see above
Noted that NEODyS has updated its 2019 RO2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RQ1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RV3 risk assessment - see above
Noted that NEODyS has updated its 2019 RV3 risk assessment - see above
Noted that JPL Sentry has removed 2019 RW as an impact risk - see above
Grabbed MPEC 2019-S06 - 2019 RZ3 - see above
Grabbed MPEC 2019-S07 - Daily Orbit Update - see above