Contents  on 27 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 27 September '19

Seven objects reported inside ten LD

Seven minor objects are reported to be within ten lunar distances (LD) of Earth today. The nearest is risk-listed 2019 SU3, which is outbound from 2.87 to 3.23 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
2.2   LD Sept. 30* 2019 SN3 17 m  4.8 from 6.4 LD Sept. 24 - Oct. 6 EPU +/- 7 mins.*
2.36 LD Sept. 24 2019 SU3 14 m  2.87 to 3.23 LD Sept. 6 - Oct. 10 NHATS target, risk - DOU
2.99 LD Sept. 24 2019 SW1 12 m  7.84 to 10.52 LD Sept. 21 - 27 exits ten LD
3.13 LD Sept. 30 2019 SH3 24 m  7.28 from 10.25 LD today - Oct. 3 enters ten LD - DOU
4.22 LD yesterday 2017 KP27 23 m  4.22 to 4.40 LD Sept. 18 - Oct. 5 NHATS target
5.66 LD yesterday 2019 SP2 56 m  5.73 to 6.41 LD Sept. 22 - 30 NHATS target
8.45 LD Sept. 20 2019 RP2 5 m  8.81 to 8.93 LD Sept. 7 - Oct. 4 NHATS target
Approaching Traffic - sorted by 10-LD bubble entry date
1.0   LD Oct. 3* 2019 SP3 17 m  10.2 from 12.1 LD tomorrow - Oct. 8 EPU +/- 34 mins.*, intruder, risk
6.52 LD Sept. 29 2019 SN4 45 m  10.62 from 14.36 LD tomorrow - Oct. 1 NEW - MPEC, DOU
6.61 LD Sept. 30 2019 SP 43 m  11.37 from 14.27 LD tomorrow - Oct. 2 DOU
8.62 LD Oct. 2 2019 SX3 29 m  12.02 from 13.47 LD Sept. 29 - Oct. 4 NEW - MPEC, DOU
* EPU = Earth passage uncertainty

This report was generated at 1812 UTC with five discoveries, starting with approaching 2019 SX3 (MPEC) from late yesterday. In today's crop there is approaching 2019 SN4 (MPEC, DOU) and three already departed objects: 2019 SR4 (MPEC) went by at roughly 5.3 LD* on September 17th (Earth passage uncertainty +/- 5.65 hours), 2019 SJ4 (MPEC) at 6.8 LD* on September 17th (uncertainty +/- 51 minutes), and 2019 SF4 (MPEC) at 6.8 LD* on September 15th (uncertainty +/- 54 minutes). Today's DOU MPEC has follow-up for approaching 2019 SP, inbound 2019 SH3, and risk-listed objects outbound 2019 SU3 and departed 2019 SG1.



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 27 September '19

The MPC's NEO Confirmation Page has 103 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 103 objects listed. Of these, 55 were "one nighters." So far The Tracking News has counted a total of 129 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 27 September '19

Minor Planet Electronic Circulars

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


MPEC 2019-S121 - "21:01 UT" - 2019 SV4


MPEC 2019-S120 - "20:35 UT" - Comet 2I/Borisov


MPEC 2019-S119 - "14:04 UT" - 2019 ST4


<< DOU on 27 September '19 >>  MPEC 2019-S118 - "12:07 UT" - Daily Orbit Update


MPEC 2019-S117 - "11:30 UT" - 2019 SR4


MPEC 2019-S116 - "11:27 UT" - 2019 SQ4


MPEC 2019-S115 - "11:19 UT" - 2019 SP4


MPEC 2019-S114 - "06:11 UT" - 2019 SO4


MPEC 2019-S113 - "06:08 UT" - 2019 SN4


MPEC 2019-S112 - "06:03 UT" - 2019 SM4


MPEC 2019-S111 - "05:59 UT" - 2019 SL4


MPEC 2019-S110 - "05:57 UT" - 2019 SK4


MPEC 2019-S109 - "05:54 UT" - 2019 SJ4


MPEC 2019-S108 - "05:52 UT" - 2019 SH4


MPEC 2019-S107 - "05:48 UT" - 2019 SG4


MPEC 2019-S106 - "05:35 UT" - 2019 SF4


MPEC 2019-S105 - "02:51 UT" - Comet P/2006 R1 = 2019 S1 (Siding Spring)

Observers  on 27 September '19

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2019-S107, 2019-S109, 2019-S110, 2019-S111, 2019-S114, 2019-S115, 2019-S116, 2019-S117, 2019-S118, 2019-S119 & 2019-S121 -- 2019 SV4, 2019 ST4, 2019 SR4, 2019 SQ4, 2019 SP4, 2019 SP, 2019 SO4, 2019 SN4, 2019 SL4, 2019 SK4, 2019 SJ4, 2019 SG4, 2017 MN8
T05ATLAS Haleakala in Hawaii, 2 in MPECs 2019-S118 & 2019-S121 -- 2019 SV4, 2017 MN8
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-S113 -- 2019 SN4
160Castelmartini Obs. in Italy, 1 in MPEC 2019-S112 -- 2019 SM4
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-S119 -- 2019 ST4
107Cavezzo Obs. in Italy, 1 in MPEC 2019-S120 -- 2I
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 21 in MPECs 2019-S107, 2019-S110 & 2019-S118 -- 2019 SZ, 2019 SR2, 2019 SK4, 2019 SJ1, 2019 SH1, 2019 SG4, 2019 SF3, 2019 SE2, 2019 SD2, 2019 SC1, 2019 RU, 2019 RO2, 2019 RK, 2019 RD, 2019 RC2, 2019 QV, 2019 QD3, 2019 QC1, 2019 OZ, 2019 NZ2, 2019 NT6
A77Chante-Perdrix Obs. in France, 1 in MPEC 2019-S120 -- 2I
Z99Clixby Obs. in England, 1 in MPEC 2019-S121 -- 2019 SV4
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-S113 & 2019-S120 -- 2019 SN4, 2I
958Dax Obs. in France, 2 in MPECs 2019-S118 & 2019-S121 -- 2019 SX3, 2019 SV4
L29Drebach-South Obs., 1 in MPEC 2019-S113 -- 2019 SN4
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 8 in MPECs 2019-S105, 2019-S108, 2019-S109, 2019-S112, 2019-S113, 2019-S116 & 2019-S118 -- 2019 SX3, 2019 SQ4, 2019 SN4, 2019 SM4, 2019 SJ4, 2019 SH4, P/2019 S1, 2017 MN8
X31Galilei Obs., 1 in MPEC 2019-S113 -- 2019 SN4
J95Great Shefford Obs. in England, 3 in MPECs 2019-S118 & 2019-S121 -- 2019 SV4, 2019 SU3, 2019 SG1
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2019-S118 -- 2019 SU3
V37LCO McDonald Obs. in Texas, 1 in MPEC 2019-S118 -- 2019 SP
K92LCO Sutherland B in South Africa, 1 in MPEC 2019-S118 -- 2019 SH3
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-S117 -- 2019 SR4
152Moletai Obs. in Lithuania, 1 in MPEC 2019-S120 -- 2I
213Montcabre Obs. in Spain, 1 in MPEC 2019-S120 -- 2I
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2019-S116 & 2019-S118 -- 2019 SQ4, 2019 QL
C53NEOSSat in Earth orbit, 1 in MPEC 2019-S120 -- 2I
Z80Northolt Branch Obs. in England, 2 in MPECs 2019-S118 & 2019-S121 -- 2019 SV4, 2019 SU3
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2019-S105, 2019-S106, 2019-S107, 2019-S108, 2019-S109, 2019-S110, 2019-S111, 2019-S112, 2019-S114, 2019-S115, 2019-S116, 2019-S117 & 2019-S119 -- 2019 ST4, 2019 SR4, 2019 SQ4, 2019 SP4, 2019 SO4, 2019 SM4, 2019 SL4, 2019 SK4, 2019 SJ4, 2019 SH4, 2019 SG4, 2019 SF4, P/2019 S1
K63Pascoli Obs. in Italy, 2 in MPECs 2019-S118 & 2019-S120 -- 2017 MN8, 2I
L04ROASTERR-1 in Romania, 1 in MPEC 2019-S121 -- 2019 SV4
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-S120 -- 2I
A29Santa Maria a Monte Obs. in Italy, 1 in MPEC 2019-S120 -- 2I
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2019-S120 -- 2I
C95SATINO-1 in France, 1 in MPEC 2019-S118 -- 2019 QW3
K96Savelli Obs., 1 in MPEC 2019-S121 -- 2019 SV4
G40-program code "-" (22) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPEC 2019-S118 -- 2019 SU3, 2019 GT3
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S120 -- 2I
587Sormano Obs. in Italy, 1 in MPEC 2019-S118 -- 2019 SU3
L06Sormano2 Obs. in Italy, 1 in MPEC 2019-S120 -- 2I
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-S121 -- 2019 SV4
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2019-S120 -- 2I
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-S118 -- 2019 SP
L01Visnjan Obs., 14 in MPECs 2019-S105, 2019-S106, 2019-S107, 2019-S109, 2019-S110, 2019-S111, 2019-S112, 2019-S113, 2019-S114, 2019-S115, 2019-S117, 2019-S118, 2019-S120 & 2019-S121 -- 2019 SV4, 2019 SR4, 2019 SP4, 2019 SO4, 2019 SN4, 2019 SM4, 2019 SL4, 2019 SK4, 2019 SJ4, 2019 SG4, 2019 SF4, P/2019 S1, 2017 MN8, 2I
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 SL4JPL Sentry15302090-211757.13897e-07-5.62-5.740JPL: Computed at 00:03 today Pacific time based on 13 observations spanning 1.7448 days (2019-Sep-25.467492 to 2019-Sep-27.212307). Diameter approximately 0.061 km. from weighted mean H=23.71.
NEODyS15302085-211791.14e-06-5.44-5.540NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2019-09-25.468 to 2019-09-27.213."
2019 SU3JPL Sentry15302078-2119410.001559880737-4.09-4.210JPL: Computed at 06:40 today Pacific time based on 34 observations spanning 3.6933 days (2019-Sep-23.249638 to 2019-Sep-26.94293). Diameter approximately 0.014 km. from weighted mean H=26.85.
NEODyS15302078-21181504.33e-03-3.62-3.720NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2019-09-23.250 to 2019-09-26.944."
2019 SG1JPL Sentry15302064-206418.634e-07-7.15-7.150JPL: Computed at 06:29 today Pacific time based on 25 observations spanning 2.6226 days (2019-Sep-20.28714 to 2019-Sep-22.90971). Diameter approximately 0.010 km. from weighted mean H=27.67.
NEODyS1530206416.95e-07-7.26-7.260NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2019-09-20.288 to 2019-09-22.911."

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 27 September '19

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

2201Grabbed MPEC 2019-S120 - Comet 2I/Borisov - see above
Grabbed MPEC 2019-S121 - 2019 SV4 - see above
1812Generated Traffic Report
1530Noted that JPL Sentry has updated its 2019 SG1 risk assessment - see above
Noted that NEODyS has updated its 2019 SG1 risk assessment - see above
Noted that JPL Sentry has posted 2019 SL4 as an impact risk - see above
Noted that NEODyS has posted 2019 SL4 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 SU3 risk assessment - see above
Noted that NEODyS has updated its 2019 SU3 risk assessment - see above
Grabbed MPEC 2019-S106 - 2019 SF4 - see above
Grabbed MPEC 2019-S107 - 2019 SG4 - see above
Grabbed MPEC 2019-S108 - 2019 SH4 - see above
Grabbed MPEC 2019-S109 - 2019 SJ4 - see above
Grabbed MPEC 2019-S110 - 2019 SK4 - see above
Grabbed MPEC 2019-S111 - 2019 SL4 - see above
Grabbed MPEC 2019-S112 - 2019 SM4 - see above
Grabbed MPEC 2019-S113 - 2019 SN4 - see above
Grabbed MPEC 2019-S114 - 2019 SO4 - see above
Grabbed MPEC 2019-S115 - 2019 SP4 - see above
Grabbed MPEC 2019-S116 - 2019 SQ4 - see above
Grabbed MPEC 2019-S117 - 2019 SR4 - see above
Grabbed MPEC 2019-S118 - Daily Orbit Update - see above
Grabbed MPEC 2019-S119 - 2019 ST4 - see above
0415Grabbed MPEC 2019-S105 - Comet P/2006 R1 = 2019 S1 (Siding Spring) - see above