Contents  on 23 September '19

NOTE:  These A/CC news pages will update only intermittently for a few days. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP objects, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 23 September '19

Nine objects reported inside ten LD

There are nine asteroidal objects reported to be less than ten lunar distances (LD) from Earth today. Nearest of these is risk-listed 2019 SG1, which exits Earth's sphere of gravitational influence as it moves out from 2.26 to 4.91 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
0.73 LD Sept. 21 2019 SD1 7 m  9.32 to 14.71 LD Sept. 19 - 23 intruder, exits ten LD
1.10 LD Sept. 21 2019 SX 4 m  4.36 to 7.53 LD Sept. 18 - 24 risk
1.40 LD Sept. 19 2019 SC 12 m  9.85 to 12.86 LD Sept. 16 - 23 Moon buzzer, exits ten LD, risk
2.21 LD yesterday 2019 SG1 9 m  2.26 to 4.91 LD Sept. 20 - 25 exits Earth SOI, risk
2.99 LD tomorrow 2019 SW1 12 m  3.26 from 5.10 LD Sept. 21 - 27 NEW - MPEC
4.22 LD Sept. 26 2017 KP27 23 m  5.15 from 5.81 LD Sept. 18 - Oct. 5 NHATS target
5.50 LD Sept. 20 2019 ST 44 m  8.61 to 10.99 LD Sept. 17 - 23 exits ten LD
7.89 LD Sept. 21 2017 SL16 23 m  8.36 to 8.96 LD Sept. 16 - 25 NHATS target
8.45 LD Sept. 20 2019 RP2 5 m  8.51 to 8.56 LD Sept. 7 - Oct. 4 NHATS target
Approaching Traffic
6.7   LD Sept. 30* 2019 SP 44 m  23.9 from 27.1 LD Sept. 28 - Oct. 3 *Earth passage uncertainty +/- 2.32 hours

This report was generated at 1918 UTC with five discoveries: Three from yesterday -- inbound 2019 SW1 (MPEC) and already departed objects 2019 SU1 (MPEC), which flew by at about 4.4 LD* on September 13th (uncertainty +/- 1.00 hours), and 2019 SQ1 (MPEC), which went by at roughly 3.2 LD* on September 10th (uncertainty +/- 8.53 hours). And two discoveries from today -- already departed objects 2019 SM2 (MPEC), which went past us at 6.48 LD on September 15th, and 2019 SC2 (MPEC), calculated to have flown by at about 8.3 LD* on September 10th (uncertainty +/- 2.73 hours). Today's DOU MPEC has follow-up for departed 2019 RW1.



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 23 September '19

The MPC's NEO Confirmation Page has 57 listings

When last checked at 2200 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 57 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 64 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 23 September '19

Minor Planet Electronic Circulars

As of last check at 2200 UTC, there have been twelve MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S67 - "15:55 UT" - 2018 PK21


MPEC 2019-S66 - "15:49 UT" - 2012 TB53


MPEC 2019-S65 - "15:44 UT" - 2019 SM2


MPEC 2019-S64 - "15:42 UT" - 2019 SL2


MPEC 2019-S63 - "15:37 UT" - 2008 SP


MPEC 2019-S62 - "13:39 UT" - Comet C/2019 Q4 (Borisov)


<< DOU on 23 September '19 >>  MPEC 2019-S61 - "12:11 UT" - Daily Orbit Update


MPEC 2019-S60 - "00:51 UT" - 2019 SF2


MPEC 2019-S59 - "00:48 UT" - 2019 SE2


MPEC 2019-S58 - "00:44 UT" - 2019 SD2


MPEC 2019-S57 - "00:39 UT" - 2019 SC2


MPEC 2019-S56 - "00:37 UT" - 2019 SB2

Observers  on 23 September '19

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

CodeObserver / observatory
K40Altdorf Obs. in Germany, 1 in MPEC 2019-S61 -- 2100
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2019-S58 & 2019-S61 -- 2019 SD2, 2019 RV2, 2019 RH2, 2019 QC8, 2019 QC5, 2019 PP1, 2019 PC3, 2019 NK5, 2019 MK2, 2019 JX6
215Buchloe Obs. in Germany, 1 in MPEC 2019-S62 -- C/2019 Q4
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2019-S62 -- C/2019 Q4
160Castelmartini Obs. in Italy, 6 in MPEC 2019-S61 -- 90403, 18172, 105140, 4183, 2059, 1865
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2019-S56 & 2019-S64 -- 2019 SL2, 2019 SB2
A77Chante-Perdrix Obs. in France, 1 in MPEC 2019-S62 -- C/2019 Q4
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-S62 -- C/2019 Q4
K87Dettelbach Vineyard Obs. in Germany, 4 in MPEC 2019-S61 -- 503960, 326777, 237805, 1865
734Farpoint Obs. in Kansas, 1 in MPEC 2019-S63 -- 2008 SP
L19Felsina AAB Obs., 1 in MPEC 2019-S62 -- C/2019 Q4
E89Geyserland Obs. in New Zealand, 2 in MPEC 2019-S61 -- 111253, 4953
J95Great Shefford Obs. in England, 1 in MPEC 2019-S62 -- C/2019 Q4
238Grorudalen Obs. in Norway, 1 in MPEC 2019-S61 -- 2015 RZ35
U69|program code "|" (32) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2019-S62 -- C/2019 Q4
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-S62 -- C/2019 Q4
246KLENOT in the Czech Republic, 1 in MPEC 2019-S62 -- C/2019 Q4
K93LCO Sutherland C in South Africa, 1 in MPEC 2019-S61 -- 2019 QV
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2019-S63, 2019-S64, 2019-S65 & 2019-S66 -- 2019 SM2, 2019 SL2, 2012 TB53, 2008 SP
C10Maisoncelles Obs. in France, 1 in MPEC 2019-S62 -- C/2019 Q4
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2019-S62 -- C/2019 Q4
213Montcabre Obs. in Spain, 1 in MPEC 2019-S62 -- C/2019 Q4
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2019-S56, 2019-S57, 2019-S58, 2019-S59, 2019-S60, 2019-S63, 2019-S64, 2019-S65 & 2019-S66 -- 2019 SM2, 2019 SL2, 2019 SF2, 2019 SE2, 2019 SD2, 2019 SC2, 2019 SB2, 2012 TB53, 2008 SP
C53NEOSSat in Earth orbit, 1 in MPEC 2019-S62 -- C/2019 Q4
C23Olmen Obs. in Belgium, 1 in MPEC 2019-S62 -- C/2019 Q4
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2019-S60, 2019-S63, 2019-S64 & 2019-S65 -- 2019 SM2, 2019 SL2, 2019 SF2, 2008 SP
L04ROASTERR-1 in Romania, 1 in MPEC 2019-S62 -- C/2019 Q4
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-S62 -- C/2019 Q4
C95SATINO-1 in France, 2 in MPECs 2019-S61 & 2019-S62 -- 2019 QQ, C/2019 Q4
G40'W.F. Cashwell in Nevada via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S61 -- 2010 UH7
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S62 -- C/2019 Q4
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2019-S61 & 2019-S67 -- 2019 RW1, 2018 PK21, 2008 RH1, 2003 SD201
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-S61 -- 492143
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2019-S58, 2019-S59, 2019-S60 & 2019-S63 -- 2019 SF2, 2019 SE2, 2019 SD2, 2008 SP
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-S62 -- C/2019 Q4
461SZTE Asteroid Program in Hungary, 1 in MPEC 2019-S62 -- C/2019 Q4
I81Tarbatness Obs. in Scotland, 1 in MPEC 2019-S62 -- C/2019 Q4
L01Visnjan Obs., 1 in MPEC 2019-S58 -- 2019 SD2
G33Wickede Obs. in Germany, 1 in MPEC 2019-S61 -- 1620
I41Zwicky Transient Facility (ZTF) in southern California, 10 in MPEC 2019-S61 -- 2012 CK2, 2009 QB36, 2006 MA, 2006 KE, 494880, 442243, 162273, 143527, 11885, 1627
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2200 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 SU1NEODyS08152106-211722.12e-08-9.76-9.990NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2019-09-20.147 to 2019-09-21.232."
JPL Sentry04432104-2119411.07093953e-05-7.05-7.480JPL: Computed at 17:09 Sept. 22nd Pacific time based on 11 observations spanning 1.0853 days (2019-Sep-20.14593 to 2019-Sep-21.23122). Diameter approximately 0.007 km. from weighted mean H=28.33.
2009 FZ4JPL Sentry04432020-21163982.3834658e-06-5.38-6.500JPL: Computed at 22:33 April 7th of 2017 Pacific time based on 11 observations spanning .59999 days (2009-Mar-19.36974 to 2009-Mar-19.96973). Diameter approximately 0.031 km. from weighted mean H=25.21.

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 23 September '19

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

1918Generated Traffic Report
1835Grabbed MPEC 2019-S67 - 2018 PK21 - see above
1551Grabbed MPEC 2019-S63 - 2008 SP - see above
Grabbed MPEC 2019-S64 - 2019 SL2 - see above
Grabbed MPEC 2019-S65 - 2019 SM2 - see above
Grabbed MPEC 2019-S66 - 2012 TB53 - see above
1415Grabbed MPEC 2019-S61 - Daily Orbit Update - see above
Grabbed MPEC 2019-S62 - Comet C/2019 Q4 (Borisov) - see above
0815Noted that NEODyS has posted 2019 SU1 as an impact risk - see above
0443Noted that JPL Sentry has updated its 2009 FZ4 risk assessment - see above
Noted that JPL Sentry has posted 2019 SU1 as an impact risk - see above
Grabbed MPEC 2019-S56 - 2019 SB2 - see above
Grabbed MPEC 2019-S57 - 2019 SC2 - see above
Grabbed MPEC 2019-S58 - 2019 SD2 - see above
Grabbed MPEC 2019-S59 - 2019 SE2 - see above
Grabbed MPEC 2019-S60 - 2019 SF2 - see above