Contents  on 26 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 26 September '19

Nine objects reported inside ten LD

Bulletin - 2340 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
8.62 LD at 0601 UTC Oct. 22019 SX328 m Sept. 29 - Oct. 4MPEC


Nine Solar-System small bodies are reported within ten lunar distances (LD) of our planet today. Closest is newly announced risk-listed 2019 SU3, which travels outward from 2.58 to 2.87 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
0.30 LD Sept. 21 2019 SS2 2 m  8.95 to 10.86 LD Sept. 16 - 26 intruder, NHATS target, exits ten LD
0.7   LD Sept. 22* 2019 SS3 20 m  9.9 to 13.1 LD Sept. 19 - 26 NEW, EPU +/- 21 mins.*, intruder, exits ten LD - MPEC
2.2   LD Sept. 30* 2019 SN3 17 m  6.4 from 8.0 LD Sept. 24 - Oct. 6 EPU +/- 7 mins.* - DOU
2.36 LD Sept. 24 2019 SU3 15 m  2.58 to 2.87 LD Sept. 6 - Oct. 10 NEW, risk - MPEC
2.99 LD Sept. 24 2019 SW1 12 m  5.32 to 7.84 LD Sept. 21 - 27
4.22 LD today 2017 KP27 23 m  4.22 LD Sept. 18 - Oct. 5 NHATS target, Earth closest at 1935 UTC
5.66 LD today 2019 SP2 56 m  5.66 LD Sept. 22 - 30 NHATS target, Earth closest at 1337 UTC
7.3   LD Sept. 22* 2019 SL3 12 m  9.4 to 10.4 LD Sept. 17 - 26 EPU +/- 8 mins.*, NHATS target, exits ten LD
8.45 LD Sept. 20 2019 RP2 5 m  8.71 to 8.81 LD Sept. 7 - Oct. 4 NHATS target
Approaching Traffic - sorted by 10-LD bubble entry date
3.13 LD Sept. 30 2019 SH3 23 m  10.26 from 13.34 LD tomorrow - Oct. 3 DOU
1.0   LD Oct. 3* 2019 SP3 17 m  12.1 from 14.0 LD Sept. 28 - Oct. 8 NEW, EPU +/- 34 mins.*, intruder, risk - MPEC
6.7   LD Sept. 30* 2019 SP 44 m  14.5 from 17.6 LD Sept. 28 - Oct. 3 EPU +/- 2.32 hours*
* EPU = Earth passage uncertainty

This report was generated at 1910 UTC with three discoveries. From late yesterday, approaching risk-listed intruder 2019 SP3 (MPEC), and from today two outbound objects -- 2019 SU3 (MPEC) and intruder 2019 SS3 (MPEC). Today's DOU MPEC has the recovery of returning 2017 SL16 and follow-up for approaching 2019 SH3, inbound 2019 SN3, and five departed objects: intruder 2019 SQ and risk-listed objects 2019 SQ1, 2019 SD, 2019 RT3, and intruder 2019 SJ.



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 26 September '19

The MPC's NEO Confirmation Page has 108 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 108 objects listed. Of these, 59 were "one nighters." So far The Tracking News has counted a total of 127 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 26 September '19

Minor Planet Electronic Circulars

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


MPEC 2019-S104 - "23:52 UT" - 2019 RN4


MPEC 2019-S103 - "22:19 UT" - 2019 SY3


MPEC 2019-S102 - "22:16 UT" - 2019 SX3


MPEC 2019-S101 - "22:12 UT" - 2019 SW3


MPEC 2019-S100 - "15:03 UT" - 2006 RH7


MPEC 2019-S99 - "13:55 UT" - 2019 SV3


MPEC 2019-S98 - "13:47 UT" - 2019 SU3


<< DOU on 26 September '19 >>  MPEC 2019-S97 - "12:07 UT" - Daily Orbit Update


MPEC 2019-S96 - "11:17 UT" - 2019 SS3


MPEC 2019-S95 - "11:12 UT" - 2019 SR3


MPEC 2019-S94 - "10:54 UT" - 2014 TZ


MPEC 2019-S93 - "00:31 UT" - 2012 PZ19

Observers  on 26 September '19

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2019-S95, 2019-S96, 2019-S97, 2019-S100, 2019-S101, 2019-S102 & 2019-S103 -- 2019 SY3, 2019 SX3, 2019 SW3, 2019 SS3, 2019 SR3, 2019 SR1, 2019 SQ, 2019 SJ, 2019 PP1, 2019 GT3, 2016 WX9, 2016 BD39, 2015 PN307, 2011 YH6, 2006 RH7
T05ATLAS Haleakala in Hawaii, 3 in MPECs 2019-S96, 2019-S98 & 2019-S102 -- 2019 SX3, 2019 SU3, 2019 SS3
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2019-S96 & 2019-S98 -- 2019 SU3, 2019 SS3
160Castelmartini Obs. in Italy, 1 in MPEC 2019-S102 -- 2019 SX3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2019-S99, 2019-S100, 2019-S101 & 2019-S104 -- 2019 SW3, 2019 SV3, 2019 RN4, 2006 RH7
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 7 in MPECs 2019-S93 & 2019-S97 -- 2019 SN3, 2019 SD, 2019 RV3, 2019 RT3, 2018 PK21, 2012 PZ19, 98943
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-S102 -- 2019 SX3
J95Great Shefford Obs. in England, 1 in MPEC 2019-S102 -- 2019 SX3
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2019-S98 -- 2019 SU3
W86LCO Cerro Tololo B in Chile, 1 in MPEC 2019-S97 -- 2004 TD10
K92LCO Sutherland B in South Africa, 1 in MPEC 2019-S97 -- 2019 SH3
K93LCO Sutherland C in South Africa, 1 in MPEC 2019-S97 -- 2003 YS17
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2019-S97 -- 228502
474Mt. John Obs. in New Zealand, 1 in MPEC 2019-S97 -- 2019 RM4
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-S97 -- 2017 UD52
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2019-S93, 2019-S94, 2019-S95, 2019-S97, 2019-S98, 2019-S99, 2019-S100, 2019-S101 & 2019-S104 -- 2019 SW3, 2019 SV3, 2019 SU3, 2019 SR3, 2019 RN4, 2017 UD52, 2014 TZ, 2012 PZ19, 2006 RH7
K63Pascoli Obs. in Italy, 1 in MPEC 2019-S102 -- 2019 SX3
C95SATINO-1 in France, 1 in MPEC 2019-S97 -- 2017 SL16
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S97 -- 2007 TQ24
587Sormano Obs. in Italy, 1 in MPEC 2019-S97 -- 2019 GT3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-S97 -- 2019 FV2
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2019-S96 & 2019-S97 -- 2019 SS3, 2006 KE
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2019-S97 -- 2019 SQ1, 2019 SJ, 2019 RV3, 2018 YH
L01Visnjan Obs., 2 in MPECs 2019-S102 & 2019-S103 -- 2019 SY3, 2019 SX3
C51WISE in Earth polar orbit, 1 in MPEC 2019-S97 -- 2019 RM4
I41Zwicky Transient Facility (ZTF) in southern California, 18 in MPECs 2019-S97 & 2019-S103 -- 2019 SY3, 2019 SM, 2019 RY1, 2019 PP1, 2019 GT3, 2011 SG16, 2006 MA, 68350, 442243, 36284, 196256, 162385, 162273, 162082, 154278, 137805, 11885, 11405
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 SU3JPL Sentry15302078-2119460.00123495618-4.16-4.310JPL: Computed at 08:09 today Pacific time based on 16 observations spanning 3.1757 days (2019-Sep-23.249638 to 2019-Sep-26.425361). Diameter approximately 0.015 km. from weighted mean H=26.79.
NEODyS15302078-21181495.38e-04-4.51-4.890NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2019-09-23.250 to 2019-09-26.426."
2019 SP3NEODyS15302046-211397.31e-05-4.70-4.70NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2019-09-22.286 to 2019-09-25.903."
JPL Sentry00412046-211343.3583704e-05-5.02-5.020JPL: Computed at 17:29 Sept. 25th Pacific time based on 9 observations spanning 3.6175 days (2019-Sep-22.2851 to 2019-Sep-25.90256). Diameter approximately 0.017 km. from weighted mean H=26.52.
2019 SQ1JPL Sentry1603R E M O V E DJPL: Risk listing removed at 1539 UTC today
2019 SJJPL Sentry16032065-2119180.000380267213-4.92-5.250JPL: Computed at 08:37 today Pacific time based on 35 observations spanning 6.9381 days (2019-Sep-18.358702 to 2019-Sep-25.296821). Diameter approximately 0.011 km. from weighted mean H=27.50.
NEODyS15302055-2118441.5e-04-5.33-5.680NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2019-09-18.360 to 2019-09-25.298."
2019 SDJPL Sentry16032080-211020.00017971612-4.11-4.110JPL: Computed at 08:30 today Pacific time based on 104 observations spanning 8.7052 days (2019-Sep-17.240317 to 2019-Sep-25.945561). Diameter approximately 0.028 km. from weighted mean H=25.43.
NEODyS15302080-211033.67e-05-4.81-4.810NEODyS: "Based on 104 optical observations (of which 1 are rejected as outliers) from 2019-09-17.241 to 2019-09-25.946."
2019 RV3JPL Sentry1530R E M O V E DJPL: Risk listing removed at 1530 UTC today
NEODyS1530R E M O V E D-
2019 RT3JPL Sentry16032075-2117207.7289688e-05-4.38-4.460JPL: Computed at 08:33 today Pacific time based on 92 observations spanning 14.452 days (2019-Sep-11.603747 to 2019-Sep-26.056068). Diameter approximately 0.032 km. from weighted mean H=25.14.
NEODyS15302075-2117361.51e-04-4.11-4.180NEODyS: "Based on 92 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-09-26.057."

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 26 September '19

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

2358Grabbed MPEC 2019-S104 - 2019 RN4 - see above
2230Grabbed MPEC 2019-S101 - 2019 SW3 - see above
Grabbed MPEC 2019-S102 - 2019 SX3 - see above
Grabbed MPEC 2019-S103 - 2019 SY3 - see above
1910Generated Traffic Report
1603Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Noted 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 removed 2019 SQ1 as an impact risk - see above
1530Noted that NEODyS has updated its 2019 RT3 risk assessment - see above
Noted that JPL Sentry has removed 2019 RV3 as an impact risk - see above
Noted that NEODyS has removed 2019 RV3 as an impact risk - see above
Noted 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 SP3 as an impact risk - see above
Noted that JPL Sentry has posted 2019 SU3 as an impact risk - see above
Noted that NEODyS has posted 2019 SU3 as an impact risk - see above
Grabbed MPEC 2019-S94 - 2014 TZ - see above
Grabbed MPEC 2019-S95 - 2019 SR3 - see above
Grabbed MPEC 2019-S96 - 2019 SS3 - see above
Grabbed MPEC 2019-S97 - Daily Orbit Update - see above
Grabbed MPEC 2019-S98 - 2019 SU3 - see above
Grabbed MPEC 2019-S99 - 2019 SV3 - see above
Grabbed MPEC 2019-S100 - 2006 RH7 - see above
0041Noted that JPL Sentry has posted 2019 SP3 as an impact risk - see above
0038Grabbed MPEC 2019-S93 - 2012 PZ19 - see above