Contents  on 18 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 18 September '19

Four objects reported inside ten LD

There are four Solar-System small bodies reported to be less than ten lunar distances (LD) from our home world today. Nearest is newly announced risk-listed 2019 SC, which moves in from 5.55 to 2.73 LD and will pass the Moon tomorrow by 0.40 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
1.40 LD tomorrow 2019 SC 11 m  2.73 from 5.55 LD Sept. 16 - 23 NEW, Moon buzzer, risk - MPEC
4.22 LD Sept. 26 2017 KP27 23 m  9.23 from 10.19 LD today - Oct. 5 NHATS target, enters ten LD
7.89 LD Sept. 21 2017 SL16 23 m  8.45 from 9.07 LD Sept. 16 - 25 NHATS target
8.4   LD Sept. 20* 2019 RP2 6 m  8.5 from 8.5 LD Sept. 7 - Oct. 4 *Earth passage uncertainty +/- 41 mins.

This report was updated at 2305 UTC with the discovery of inbound risk-listed 2019 SC (MPEC). Your first flying rocks traffic report was generated at 1920 UTC with follow-up in today's DOU MPEC for departed risk-listed 2019 RT3.



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 18 September '19

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2300 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 40 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 18 September '19

Minor Planet Electronic Circulars

As of last check at 2300 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S11 - "21:02 UT" - 2019 SC


MPEC 2019-S10 - "19:03 UT" - 2019 RB4


MPEC 2019-S09 - "14:30 UT" - Comet C/2019 Q4 (Borisov)


<< DOU on 18 September '19 >>  MPEC 2019-S08 - "12:09 UT" - Daily Orbit Update

Observers  on 18 September '19

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2019-S08 -- 2019 RC, 2019 QU1, 2019 QJ4, 2019 PP1, 2019 MX3, 2019 MK2, 2019 KX3, 2019 JX6, 2019 GT3, 90403, 85709, 340666, 237805, 18172, 2100, 2059, 1865
160Castelmartini Obs. in Italy, 15 in MPEC 2019-S08 -- 2019 GT3, 2014 QQ266, 2013 CK89, 2010 VW75, 2008 SR1, 2001 QC34, 503960, 492143, 481985, 424089, 411201, 326742, 248926, 18172, 108906
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-S11 -- 2019 SC
470Ceccano Obs. in Italy, 1 in MPEC 2019-S09 -- C/2019 Q4
A77Chante-Perdrix Obs. in France, 1 in MPEC 2019-S09 -- C/2019 Q4
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-S09 -- C/2019 Q4
K87Dettelbach Vineyard Obs. in Germany, 13 in MPEC 2019-S08 -- 2019 RT3, 2019 RC, 2019 PE2, 2019 GT3, 2015 RZ35, 2010 VW75, 90403, 503960, 340666, 326777, 237805, 105140, 1865
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2019-S08 -- 2019 QT8
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2019-S09 -- C/2019 Q4
W46Foxfire Village Obs., 3 in MPEC 2019-S08 -- 2019 GT3, 503960, 405212
203GiaGa Obs. in Italy, 2 in MPEC 2019-S08 -- 2015 RZ35, 2013 CK89
J95Great Shefford Obs. in England, 2 in MPECs 2019-S08 & 2019-S09 -- 2019 RV, C/2019 Q4
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-S09 -- C/2019 Q4
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPEC 2019-S08 -- 2019 RW, 2019 QW2, 2019 QS6, 2019 QK7, 2019 PY, 2019 LN1, 2019 HN
950.EURONEAR via La Palma in the Canary Islands, 1 in MPEC 2019-S08 -- 2014 OL339
568^R. Wainscoat on Mauna Kea in Hawaii, 2 in MPECs 2019-S08 & 2019-S10 -- 2019 RB4, 2019 QT8
C653program code 3 via Montsec Obs. in Spain, 1 in MPEC 2019-S09 -- C/2019 Q4
C53NEOSSat in Earth orbit, 1 in MPEC 2019-S09 -- C/2019 Q4
C23Olmen Obs. in Belgium, 1 in MPEC 2019-S09 -- C/2019 Q4
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2019-S08, 2019-S10 & 2019-S11 -- 2019 SC, 2019 RB4, 2019 QY3, 2019 QT8, 405212
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-S10 -- 2019 RB4
B49Paus Obs. in Spain, 1 in MPEC 2019-S09 -- C/2019 Q4
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2019-S11 -- 2019 SC
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-S08 -- 2001 QC34
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-S09 -- C/2019 Q4
C95SATINO-1 in France, 1 in MPEC 2019-S08 -- 2017 SN14
204Schiaparelli Obs. in Italy, 1 in MPEC 2019-S09 -- C/2019 Q4
691Spacewatch 0.9m telescope in Arizona, 14 in MPEC 2019-S08 -- 2019 RY, 2019 RO2, 2019 RK, 2019 QY3, 2019 OQ2, 2019 NC1, 2019 LX4, 2019 GD3, 2016 SG1, 2016 QE44, 2016 PX38, 2015 RH2, 2015 OL35, 2014 PF68
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2019-S08 & 2019-S10 -- 2019 RX3, 2019 RV3, 2019 RT3, 2019 RQ1, 2019 RB4, 2019 QV7, 2013 JN7
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-S08 -- 503960
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2019-S08 & 2019-S11 -- 2019 SC, 2019 RV1, 2019 RB1, 2019 RA1, 2019 QX, 2019 QV, 2019 QT, 2019 QL1, 2019 QK4, 2019 QG, 2019 OR4, 2019 OL1, 2019 NV, 2019 MW, 2019 MV3, 2019 MF1, 2019 JY4, 2019 JX7, 2019 FV2, 2006 OD5
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-S09 -- C/2019 Q4
461SZTE Asteroid Program in Hungary, 1 in MPEC 2019-S09 -- C/2019 Q4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-S08 -- 2018 SF3
C51WISE in Earth polar orbit, 5 in MPEC 2019-S08 -- 489486, 458732, 455432, 410778, 5189
I41Zwicky Transient Facility (ZTF) in southern California, 6 in MPEC 2019-S08 -- 2019 QS8, 2019 LE5, 2015 RZ35, 2006 KE, 424089, 367525
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2300 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 SCJPL Sentry22022051-205112.330e-06-6.50-6.500JPL: Computed at 14:58 today Pacific time based on 21 observations spanning 12.408 days (2019-Sep-06.411436 to 2019-Sep-18.81947). Diameter approximately 0.011 km. from weighted mean H=27.36.
2019 RX3JPL Sentry1930R E M O V E DJPL: Risk listing removed at 1329 UTC today
2019 RV3JPL Sentry19302064-211481.01671e-07-4.53-4.980JPL: Computed at 06:30 today Pacific time based on 19 observations spanning 11.748 days (2019-Sep-06.6042 to 2019-Sep-18.35172). Diameter approximately 0.390 km. from weighted mean H=19.70.
2019 RT3JPL Sentry19302075-2115197.4804412e-05-4.38-4.460JPL: Computed at 06:33 today Pacific time based on 81 observations spanning 6.6797 days (2019-Sep-11.603747 to 2019-Sep-18.2834). Diameter approximately 0.032 km. from weighted mean H=25.12.
2019 RQ1JPL Sentry1930R E M O V E DJPL: Risk listing removed at 1330 UTC today

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 18 September '19

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

2305Updated Traffic Report
2202Noted that JPL Sentry has posted 2019 SC as an impact risk - see above
2132Grabbed MPEC 2019-S11 - 2019 SC - see above
1930Noted that JPL Sentry has removed 2019 RQ1 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RV3 risk assessment - see above
Noted that JPL Sentry has removed 2019 RX3 as an impact risk - see above
Grabbed MPEC 2019-S10 - 2019 RB4 - see above
1630Grabbed MPEC 2019-S08 - Daily Orbit Update - see above
Grabbed MPEC 2019-S09 - Comet C/2019 Q4 (Borisov) - see above