Contents  on 29 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 29 September '19

Thirteen objects reported inside ten LD

Bulletin - 2354 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
2.88 LD at 2133 UTC Sept. 262019 SU618 m not availableMPEC


Thirteen minor planets are known to be within ten lunar distances (LD) of Earth today. The closest is 2019 SN3, which enters our planet's sphere of gravitational influence as it slides in from 3.38 to 2.35 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
0.97 LD Oct. 3 2019 SP3 18 m  6.37 from 8.28 LD yesterday - Oct. 8 intruder, risk - DOU
1.39 LD Sept. 27 2019 SC6 9 m  6.99 to 10.65 LD Sept. 24 - 29 exits ten LD - MPEC, DOU
1.92 LD Sept. 26 2019 SW5 31 m  8.97 to 12.19 LD Sept. 23 - 29 exits ten LD - DOU
2.20 LD tomorrow 2019 SN3 16 m  2.35 from 3.38 LD Sept. 24 - Oct. 6 enters Earth SOI - DOU
2.36 LD Sept. 24 2019 SU3 14 m  3.64 to 4.10 LD Sept. 6 - Oct. 10 NHATS target, risk - DOU
3.13 LD tomorrow 2019 SH3 24 m  3.13 from 4.61 LD Sept. 27 - Oct. 3 DOU
4.22 LD Sept. 26 2017 KP27 23 m  4.80 to 5.38 LD Sept. 18 - Oct. 5 NHATS target
5.65 LD today 2019 SE5 14 m  5.65 LD Sept. 23 - Oct. 4 Earth closest at 0738 UTC
5.66 LD Sept. 26 2019 SP2 56 m  7.63 to 9.18 LD Sept. 22 - 30 NHATS target
6.52 LD today 2019 SN4 45 m  6.52 LD yesterday - Oct. 1 Earth closest at 2143 UTC
6.61 LD tomorrow 2019 SP 43 m  7.06 from 8.84 LD yesterday - Oct. 2
8.45 LD Sept. 20 2019 RP2 5 m  9.06 to 9.20 LD Sept. 7 - Oct. 4 NHATS target
8.63 LD Oct. 2 2019 SX3 29 m  9.70 from 10.74 LD today - Oct. 4 enters ten LD - DOU
Approaching Traffic
7.7   LD Oct. 8* 2019 SB6 16 m  16.9 from 18.5 LD Oct. 4 - 12 *Earth passage uncertainty +/- 10.32
hours, NHATS target - MPEC

This report was generated at 1940 UTC with three discoveries: From late yesterday, approaching 2019 SB6 (MPEC) and outbound 2019 SC6 (MPEC, DOU), and from today, already departed risk-listed 2019 SO6 (MPEC), which went by us at about 2.4 LD* on September 20th (approach uncertainty +/- 22 minutes). Today's DOU MPEC has follow-up for inbound objects 2019 SX3, 2019 SN3, 2019 SH3, and risk-listed intruder 2019 SP3, outbound objects 2019 SW5 and risk-listed 2019 SU3, and departed objects 2019 SQ1, risk-listed 2019 SD, and risk-listed intruder 2019 SJ, plus astrometry from early September for 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 an object's Earth passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 29 September '19

The MPC's NEO Confirmation Page has 106 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 106 objects listed. Of these, 60 were "one nighters." So far The Tracking News has counted a total of 128 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 29 September '19

Minor Planet Electronic Circulars

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


MPEC 2019-S160 - "23:01 UT" - 2019 SX6


MPEC 2019-S159 - "22:59 UT" - 2019 SW6


MPEC 2019-S158 - "22:56 UT" - 2019 SV6


MPEC 2019-S157 - "22:53 UT" - 2019 SU6


MPEC 2019-S156 - "22:46 UT" - 2019 ST6


MPEC 2019-S155 - "20:13 UT" - 2017 GG4


MPEC 2019-S154 - "20:11 UT" - 2015 VJ65


MPEC 2019-S153 - "20:09 UT" - 2016 CW193


MPEC 2019-S152 - "14:18 UT" - 2019 SR6


MPEC 2019-S151 - "14:16 UT" - 2019 SQ6


MPEC 2019-S150 - "14:13 UT" - 2019 SP6


MPEC 2019-S149 - "14:11 UT" - 2019 SO6


<< DOU on 29 September '19 >>  MPEC 2019-S148 - "12:13 UT" - Daily Orbit Update


MPEC 2019-S147 - "05:39 UT" - 2019 SJ6


MPEC 2019-S146 - "01:32 UT" - 2019 SH6


MPEC 2019-S145 - "01:06 UT" - 2019 SF6

Observers  on 29 September '19

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
R57Aorangi Iti Obs., 1 in MPEC 2019-S148 -- 2019 SN3
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPECs 2019-S148, 2019-S149 & 2019-S158 -- 2019 SV6, 2019 SR2, 2019 SR1, 2019 SQ1, 2019 SO6, 2019 SD2, 2019 SC1, 2019 RZ1, 2019 RY1, 2019 RV, 2019 QX, 2019 QN1, 2019 QC1, 2019 PP1, 2019 PE2, 2019 OG, 2019 NJ5, 2019 KC4, 2019 JP2, 2019 GD3, 2016 RN1, 2016 BD39, 2012 CK2, 2009 QB36, 2004 KF15, 2100
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-S157 -- 2019 SU6
958Dax Obs. in France, 1 in MPEC 2019-S148 -- 2019 SW5
W84!program code "!" (10) via DECam in Chile, 1 in MPEC 2019-S147 -- 2019 SJ6
K87Dettelbach Vineyard Obs. in Germany, 5 in MPEC 2019-S148 -- 2019 SW5, 2019 SC6, 2019 RL3, 2014 QQ266, 326777
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 9 in MPECs 2019-S146, 2019-S148, 2019-S149, 2019-S153, 2019-S154 & 2019-S155 -- 2019 SX3, 2019 SW5, 2019 SU3, 2019 SP3, 2019 SO6, 2019 SH6, 2017 GG4, 2016 CW193, 2015 VJ65
E89Geyserland Obs. in New Zealand, 6 in MPEC 2019-S148 -- 89355, 42286, 25330, 153842, 136993, 2100
K73Gravina Obs. in Italy, 3 in MPEC 2019-S148 -- 405212, 3200, 1620
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2019-S148 -- 2016 RQ33
V37LCO McDonald Obs. in Texas, 1 in MPEC 2019-S148 -- 2019 SX3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2019-S145, 2019-S147, 2019-S148, 2019-S150, 2019-S151 & 2019-S157 -- 2019 SX3, 2019 SU6, 2019 SQ6, 2019 SP6, 2019 SJ6, 2019 SF6
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2019-S145, 2019-S148 & 2019-S151 -- 2019 SQ6, 2019 SF6, 2016 NK56, 2007 WE
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2019-S148 -- 2019 SX3, 2019 SU3, 2019 SH3
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2019-S146, 2019-S147, 2019-S149, 2019-S150, 2019-S152, 2019-S153, 2019-S156, 2019-S157, 2019-S158, 2019-S159 & 2019-S160 -- 2019 SX6, 2019 SW6, 2019 SV6, 2019 SU6, 2019 ST6, 2019 SR6, 2019 SP6, 2019 SO6, 2019 SJ6, 2019 SH6, 2016 CW193
K63Pascoli Obs. in Italy, 2 in MPECs 2019-S148 & 2019-S151 -- 2019 SW5, 2019 SQ6
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2019-S148 -- 2016 NK56
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-S151 -- 2019 SQ6
C95SATINO-1 in France, 1 in MPEC 2019-S148 -- 2019 RA
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2019-S148 -- 481542
691Spacewatch 0.9m telescope in Arizona, 14 in MPECs 2019-S146 & 2019-S148 -- 2019 SU3, 2019 SP3, 2019 SH6, 2019 SF2, 2019 SE3, 2019 RK, 2019 QF2, 2019 OQ2, 2019 LX4, 2019 GT3, 2019 FV2, 2016 PA2, 2015 RH2, 2015 OL35
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2019-S148, 2019-S149 & 2019-S152 -- 2019 SR6, 2019 SO6, 2019 SD
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2019-S145, 2019-S148, 2019-S151 & 2019-S157 -- 2019 SU6, 2019 SQ6, 2019 SM, 2019 SF6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-S148 -- 2019 SJ, 2019 QS3
L01Visnjan Obs., 6 in MPECs 2019-S145, 2019-S151, 2019-S156, 2019-S157, 2019-S158 & 2019-S160 -- 2019 SX6, 2019 SV6, 2019 SU6, 2019 ST6, 2019 SQ6, 2019 SF6
I41Zwicky Transient Facility (ZTF) in southern California, 6 in MPEC 2019-S148 -- 2019 SM, 2019 PA, 2015 YL10, 2006 MA, 2006 KE, 2001 QC34
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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.
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 SO6NEODyS2134207712.42e-08-7.54-7.540NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2019-09-26.296 to 2019-09-29.326."
JPL Sentry16302112-211211.866e-09-8.86-8.860JPL: Computed at 08:31 today Pacific time based on 14 observations spanning 3.0301 days (2019-Sep-26.29511 to 2019-Sep-29.32523). Diameter approximately 0.026 km. from weighted mean H=25.59.
2019 SH6NEODyS16002021-2115706.16e-09-5.25-5.330NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2019-09-26.585 to 2019-09-29.037."
2019 SU3NEODyS21342078-21181863.43e-03-3.77-4.250NEODyS #2 for the day: "Based on 54 optical observations (of which 1 are rejected as outliers) from 2019-09-23.250 to 2019-09-29.319."
JPL Sentry16302078-2119390.0024270907-3.95-4.050JPL: Computed at 07:59 today Pacific time based on 53 observations spanning 6.0690 days (2019-Sep-23.249638 to 2019-Sep-29.31862). Diameter approximately 0.014 km. from weighted mean H=26.96.
2019 SP3NEODyS21342046-211731.26e-04-4.40-4.40NEODyS #2 for the day: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2019-09-22.286 to 2019-09-29.158."
JPL Sentry16302046-204618.242e-05-4.57-4.570JPL: Computed at 07:29 today Pacific time based on 17 observations spanning 6.8721 days (2019-Sep-22.2851 to 2019-Sep-29.15721). Diameter approximately 0.018 km. from weighted mean H=26.40.
2019 SQ1NEODyS21342082-211126.02e-09-9.92-9.920NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2019-09-20.284 to 2019-09-26.197."
2019 SJNEODyS21342062-2118311.6e-04-5.32-5.690NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2019-09-18.360 to 2019-09-26.255."
JPL Sentry16302065-2119200.000394543034-4.92-5.240JPL: Computed at 07:37 today Pacific time based on 37 observations spanning 7.8959 days (2019-Sep-18.358702 to 2019-Sep-26.254553). Diameter approximately 0.011 km. from weighted mean H=27.51.
2019 SDNEODyS21342069-211053.76e-05-4.80-4.80NEODyS: "Based on 107 optical observations (of which 1 are rejected as outliers) from 2019-09-17.241 to 2019-09-29.259."
JPL Sentry16302080-211020.000194508219-4.07-4.070JPL: Computed at 07:31 today Pacific time based on 107 observations spanning 12.018 days (2019-Sep-17.240317 to 2019-Sep-29.25823). Diameter approximately 0.028 km. from weighted mean H=25.43.
2018 EE9NEODyS16002067-2118267.02e-06-5.96-6.060NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2018-03-08.029 to 2018-03-26.315."

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 29 September '19

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

2312Grabbed MPEC 2019-S156 - 2019 ST6 - see above
Grabbed MPEC 2019-S157 - 2019 SU6 - see above
Grabbed MPEC 2019-S158 - 2019 SV6 - see above
Grabbed MPEC 2019-S159 - 2019 SW6 - see above
Grabbed MPEC 2019-S160 - 2019 SX6 - see above
2134Noted that NEODyS has updated its 2019 SD risk assessment - see above
Noted that NEODyS has updated its 2019 SJ risk assessment - see above
Noted that NEODyS has posted 2019 SO6 as an impact risk - see above
Noted that NEODyS has updated its 2019 SP3 risk assessment - see above
Noted that NEODyS has posted 2019 SQ1 as an impact risk - see above
Noted that NEODyS has updated its 2019 SU3 risk assessment - see above
Grabbed MPEC 2019-S155 - 2017 GG4 - see above
2032Grabbed MPEC 2019-S153 - 2016 CW193 - see above
Grabbed MPEC 2019-S154 - 2015 VJ65 - see above
1940Generated Traffic Report
1630Noted that JPL Sentry has updated its 2019 SD risk assessment - see above
Noted that JPL Sentry has updated its 2019 SJ risk assessment - see above
Noted that JPL Sentry has posted 2019 SO6 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 SP3 risk assessment - see above
Noted that JPL Sentry has updated its 2019 SU3 risk assessment - see above
1600Noted that NEODyS has updated its 2018 EE9 risk assessment - see above
Noted that NEODyS has posted 2019 SH6 as an impact risk - see above
Noted that NEODyS has updated its 2019 SP3 risk assessment - see above
Noted that NEODyS has updated its 2019 SU3 risk assessment - see above
Grabbed MPEC 2019-S148 - Daily Orbit Update - see above
Grabbed MPEC 2019-S149 - 2019 SO6 - see above
Grabbed MPEC 2019-S150 - 2019 SP6 - see above
Grabbed MPEC 2019-S151 - 2019 SQ6 - see above
Grabbed MPEC 2019-S152 - 2019 SR6 - see above
0602Grabbed MPEC 2019-S147 - 2019 SJ6 - see above
0433Grabbed MPEC 2019-S145 - 2019 SF6 - see above
Grabbed MPEC 2019-S146 - 2019 SH6 - see above