Contents  on 24 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 24 September '19

Nine objects reported inside ten LD

There are nine transient natural objects reported within ten lunar distances (LD) of our home world today. The nearest is 2019 SW1, which comes its closest to Earth this time around, reaching 2.99 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
0.2   LD Sept. 21* 2019 SU2 3 m  7.5 to 10.0 LD Sept. 17 - 24 NEW, EPU +/- 5 mins.*, intruder, exits
ten LD, risk - MPEC
0.30 LD Sept. 21 2019 SS2 2 m  5.15 to 7.05 LD Sept. 16 - 26 NEW, intruder - MPEC
1.10 LD Sept. 21 2019 SX 4 m  7.53 to 10.75 LD Sept. 18 - 24 exits ten LD, risk
2.21 LD Sept. 22 2019 SG1 9 m  4.91 to 8.59 LD Sept. 20 - 25 risk
2.99 LD today 2019 SW1 12 m  2.99 LD Sept. 21 - 27 Earth closest at 1051 UTC
4.22 LD Sept. 26 2017 KP27 23 m  4.63 from 5.15 LD Sept. 18 - Oct. 5 NHATS target
5.66 LD Sept. 26 2019 SP2 54 m  6.55 from 7.83 LD Sept. 22 - 30 NEW, NHATS target - MPEC, DOU
7.89 LD Sept. 21 2017 SL16 23 m  8.96 to 9.74 LD Sept. 16 - 25 NHATS target
8.45 LD Sept. 20 2019 RP2 5 m  8.56 to 8.63 LD Sept. 7 - Oct. 4 NHATS target
Approaching Traffic
6.7   LD Sept. 30* 2019 SP 44 m  20.7 from 23.9 LD Sept. 28 - Oct. 3 EPU +/- 2.32 hours*
* EPU = Earth passage uncertainty

This report was updated at 2305 UTC with the discovery of already departed 2019 SY2 (MPEC), which went by our planet at 3.32 LD on September 19th. Your first neighborhood asteroid traffic report was generated at 1940 UTC with the discoveries of inbound 2019 SP2 (MPEC, DOU) and outbound intruders 2019 SS2 (MPEC) and risk-listed 2019 SU2 (MPEC). Today's DOU MPEC has the recovery of distant 163899 2003 SD220, follow-up for departed risk-listed 2019 SD, and additional observation from May of risk-listed 2019 JH7 (1.07 days added to 1.67-day observation arc).

News item:  The IAU Minor Planet Center announced today that comet C/2019 Q4 has been assigned the permanent designation 2I/Borisov, noting that "Continued observation and analysis of this object has confirmed its hyperbolic orbit and interstellar origin."



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. "Distant" is used here to describe an object under observation that has approached Earth within ten LD since A/CC began these traffic reports twelve-plus years ago but is not currently coming so close. Object temporal distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 24 September '19

The MPC's NEO Confirmation Page has 64 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 64 objects listed. Of these, 40 were "one nighters." So far The Tracking News has counted a total of 83 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 24 September '19

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been fourteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S81 - "21:18 UT" - 2019 SB3


MPEC 2019-S80 - "21:10 UT" - 2019 SA3


MPEC 2019-S79 - "21:07 UT" - 2019 SZ2


MPEC 2019-S78 - "21:04 UT" - 2019 SY2


MPEC 2019-S77 - "20:17 UT" - 2019 SX2


MPEC 2019-S76 - "19:32 UT" - 2019 SW2


MPEC 2019-S75 - "15:13 UT" - 2019 SU2


MPEC 2019-S74 - "15:10 UT" - 2019 ST2


MPEC 2019-S73 - "15:01 UT" - 2019 SS2


MPEC 2019-S72 - "11:55 UT" - 2I/Borisov = C/2019 Q4 (Borisov)


<< DOU on 24 September '19 >>  MPEC 2019-S71 - "12:00 UT" - Daily Orbit Update


MPEC 2019-S70 - "01:38 UT" - 2019 SR2


MPEC 2019-S69 - "01:34 UT" - 2019 SQ2


MPEC 2019-S68 - "01:32 UT" - 2019 SP2

Observers  on 24 September '19

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2019-S71, 2019-S73, 2019-S74, 2019-S75, 2019-S78, 2019-S79, 2019-S80 & 2019-S81 -- 2019 SZ2, 2019 SY2, 2019 SU2, 2019 ST2, 2019 SS2, 2019 SR2, 2019 SB3, 2019 SA3
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2019-S68 & 2019-S70 -- 2019 SR2, 2019 SP2
160Castelmartini Obs. in Italy, 1 in MPEC 2019-S71 -- 6455
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2019-S68, 2019-S69 & 2019-S76 -- 2019 SW2, 2019 SQ2, 2019 SP2
470Ceccano Obs. in Italy, 1 in MPEC 2019-S72 -- 2I
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-S68 & 2019-S69 -- 2019 SQ2, 2019 SP2
958Dax Obs. in France, 1 in MPEC 2019-S68 -- 2019 SP2
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-S71 -- 2019 JH7
734Farpoint Obs. in Kansas, 3 in MPECs 2019-S68, 2019-S70 & 2019-S80 -- 2019 SR2, 2019 SP2, 2019 SA3
J95Great Shefford Obs. in England, 1 in MPEC 2019-S68 -- 2019 SP2
C43Hoyerswerda Obs. in Germany, 2 in MPECs 2019-S68 & 2019-S69 -- 2019 SQ2, 2019 SP2
585Kiev Comet Station in Ukraine, 2 in MPECs 2019-S68 & 2019-S69 -- 2019 SQ2, 2019 SP2
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2019-S71 -- 2019 RC
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2019-S69, 2019-S74, 2019-S76 & 2019-S80 -- 2019 SW2, 2019 ST2, 2019 SQ2, 2019 SA3
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2019-S70, 2019-S73, 2019-S74, 2019-S75, 2019-S76, 2019-S77 & 2019-S78 -- 2019 SY2, 2019 SX2, 2019 SW2, 2019 SU2, 2019 ST2, 2019 SS2, 2019 SR2
C53NEOSSat in Earth orbit, 1 in MPEC 2019-S72 -- 2I
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-S68 -- 2019 SP2
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2019-S69, 2019-S76, 2019-S77, 2019-S78, 2019-S80 & 2019-S81 -- 2019 SY2, 2019 SX2, 2019 SW2, 2019 SQ2, 2019 SB3, 2019 SA3
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-S77 -- 2019 SX2
K63Pascoli Obs. in Italy, 3 in MPECs 2019-S68, 2019-S69 & 2019-S70 -- 2019 SR2, 2019 SQ2, 2019 SP2
B49Paus Obs. in Spain, 1 in MPEC 2019-S79 -- 2019 SZ2
654Pomona College Table Mtn. Obs. (PCTMO) in southern California, 2 in MPECs 2019-S68 & 2019-S71 -- 2019 SR2, 2019 SP2
L18QOS Obs., 1 in MPECs 2019-S68 & 2019-S71 -- 2019 SP2
L04ROASTERR-1 in Romania, 4 in MPECs 2019-S68, 2019-S69 & 2019-S71 -- 2019 SQ2, 2019 SP2, 2019 PE2, 2019 GT3
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-S71 -- 2019 SR2
C95SATINO-1 in France, 1 in MPEC 2019-S71 -- 2019 QC1
204Schiaparelli Obs. in Italy, 3 in MPECs 2019-S69, 2019-S70 & 2019-S80 -- 2019 SR2, 2019 SQ2, 2019 SA3
645Sloan Digital Sky Survey (SDSS) in New Mexico, 7 in MPEC 2019-S71 -- 2015 WA1, 2015 BB511, 2014 HE3, 494999, 412977, 16912, 3988
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S72 -- 2I
587Sormano Obs. in Italy, 5 in MPECs 2019-S68, 2019-S69, 2019-S70, 2019-S74 & 2019-S80 -- 2019 ST2, 2019 SR2, 2019 SQ2, 2019 SP2, 2019 SA3
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2019-S70 & 2019-S71 -- 2019 SW, 2019 SR2
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2019-S68, 2019-S69 & 2019-S70 -- 2019 SR2, 2019 SQ2, 2019 SP2
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2019-S68, 2019-S69, 2019-S73 & 2019-S75 -- 2019 SU2, 2019 SS2, 2019 SQ2, 2019 SP2
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-S72 -- 2I
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-S71 -- 2019 SD, 2019 HC
K41Vegaquattro Obs. in Italy, 2 in MPECs 2019-S68 & 2019-S69 -- 2019 SQ2, 2019 SP2
L01Visnjan Obs., 1 in MPEC 2019-S80 -- 2019 SA3
C51WISE in Earth polar orbit, 3 in MPEC 2019-S71 -- 2014 QK433, 455432, 264993
I41Zwicky Transient Facility (ZTF) in southern California, 12 in MPECs 2019-S71 & 2019-S79 -- 2019 SZ2, 2019 GT3, 2010 UH7, 2006 MA, 2006 KE, 442243, 334412, 243025, 163899, 162273, 112221, 2212
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 SU2NEODyS20102084-211233.99e-08-9.96-10.150NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2019-09-22.373 to 2019-09-24.306."
JPL Sentry17002096-209622.0464e-07-9.26-9.420JPL: Computed at 09:29 today Pacific time based on 13 observations spanning 1.9327 days (2019-Sep-22.37234 to 2019-Sep-24.305081). Diameter approximately 0.004 km. from weighted mean H=29.93.
2019 SDJPL Sentry17002080-211020.00017933039-4.11-4.110JPL: Computed at 06:30 today Pacific time based on 101 observations spanning 7.1907 days (2019-Sep-17.240317 to 2019-Sep-24.430999). Diameter approximately 0.028 km. from weighted mean H=25.43.
2019 JH7NEODyS20102114-211821.02e-06-8.60-8.690NEODyS: "Based on 79 optical observations (of which 5 are rejected as outliers) from 2019-05-13.266 to 2019-05-16.009."
JPL Sentry17002114-211829.992e-07-8.60-8.890JPL: Computed at 06:39 today Pacific time based on 78 observations spanning 2.7433 days (2019-May-13.2651 to 2019-May-16.008371). Diameter approximately 0.004 km. from weighted mean H=29.64.
2006 JY26NEODyS20102073-21181839.49e-03-4.00-4.00NEODyS: "Based on 77 optical observations (of which 2 are rejected as outliers) from 2006-05-06.356 to 2006-05-10.175."

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 24 September '19

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

2305Updated Traffic Report
2131Grabbed MPEC 2019-S78 - 2019 SY2 - see above
Grabbed MPEC 2019-S79 - 2019 SZ2 - see above
Grabbed MPEC 2019-S80 - 2019 SA3 - see above
Grabbed MPEC 2019-S81 - 2019 SB3 - see above
2030Grabbed MPEC 2019-S77 - 2019 SX2 - see above
2010Noted that NEODyS has updated its 2006 JY26 risk assessment - see above
Noted that NEODyS has updated its 2019 JH7 risk assessment - see above
Noted that NEODyS has posted 2019 SU2 as an impact risk - see above
1933Grabbed MPEC 2019-S76 - 2019 SW2 - see above
1700Noted that JPL Sentry has updated its 2019 JH7 risk assessment - see above
Noted that JPL Sentry has updated its 2019 SD risk assessment - see above
Noted that JPL Sentry has posted 2019 SU2 as an impact risk - see above
Grabbed MPEC 2019-S71 - Daily Orbit Update - see above
Grabbed MPEC 2019-S72 - 2I/Borisov = C/2019 Q4 (Borisov) - see above
Grabbed MPEC 2019-S73 - 2019 SS2 - see above
Grabbed MPEC 2019-S74 - 2019 ST2 - see above
Grabbed MPEC 2019-S75 - 2019 SU2 - see above
0400Grabbed MPEC 2019-S68 - 2019 SP2 - see above
Grabbed MPEC 2019-S69 - 2019 SQ2 - see above
Grabbed MPEC 2019-S70 - 2019 SR2 - see above