Contents  on 22 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 22 September '19

Eight objects reported inside ten LD

Bulletin - 0007 UTC 23 Sept.:  Three new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
2.99 LD at 1052 UTC tomorrow2019 SW112 m Sept. 20 - 28MPEC
3.17 LD at 1210 UTC Sept. 102019 SQ110 m Sept. 3 - 18MPEC
4.44 LD at 1417 UTC Sept. 132019 SU17 m Sept. 5 - 21MPEC


Eight small celestial objects are known to be less than ten lunar distances (LD) from our home world today. Risk-listed 2019 SX exits Earth's sphere of gravitational influence (SOI), traveling outward from 1.47 to 4.36 LD, and, within the SOI, risk-listed 2019 SG1 comes its closest on this passage, reaching 2.21 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 yesterday 2019 SD1 7 m  3.95 to 9.32 LD Sept. 19 - 23 intruder
1.10 LD yesterday 2019 SX 4 m  1.47 to 4.36 LD Sept. 18 - 24 exits Earth SOI, risk
1.40 LD Sept. 19 2019 SC 12 m  6.87 to 9.85 LD Sept. 16 - 23 Moon buzzer, risk
2.21 LD today 2019 SG1 9 m  2.21 LD Sept. 20 - 25 Earth closest at 2107 UTC, Moon closest
1.49 LD at 2317 UTC, risk
4.22 LD Sept. 26 2017 KP27 23 m  5.81 from 6.58 LD Sept. 18 - Oct. 5 NHATS target - DOU
5.50 LD Sept. 20 2019 ST 44 m  6.64 to 8.61 LD Sept. 17 - 23 DOU
7.89 LD yesterday 2017 SL16 23 m  8.00 to 8.36 LD Sept. 16 - 25 NHATS target
8.45 LD Sept. 20 2019 RP2 5 m  8.47 to 8.51 LD Sept. 7 - Oct. 4 NHATS target - DOU
Approaching Traffic
6.7   LD Sept. 30* 2019 SP 44 m  27.1 from 30.4 LD Sept. 28 - Oct. 3 *Earth passage uncertainty +/- 2.32 hours

This report was generated at 1720 UTC with the discovery of already departed 2019 SK1 (MPEC), which passed us at about 2.8 LD on September 12th (uncertainty +/- 31 minutes), and with follow-up in today's DOU MPEC for inbound 2017 KP27, outbound objects 2019 ST and 2019 RP2, and departed risk-listed 2019 SD.



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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 22 September '19

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2356 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 46 were "one nighters." So far The Tracking News has counted a total of 97 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 22 September '19

Minor Planet Electronic Circulars

As of last check at 2356 UTC, there have been seventeen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S55 - "23:41 UT" - 2019 SA2


MPEC 2019-S54 - "23:08 UT" - 2019 SW1


MPEC 2019-S53 - "23:05 UT" - 2019 SV1


MPEC 2019-S52 - "22:59 UT" - 2019 SU1


MPEC 2019-S51 - "22:51 UT" - 2019 ST1


MPEC 2019-S50 - "22:42 UT" - 2019 SS1


MPEC 2019-S49 - "22:36 UT" - 2019 SR1


MPEC 2019-S48 - "21:37 UT" - 2019 SQ1


MPEC 2019-S47 - "21:23 UT" - 2001 SX269


MPEC 2019-S46 - "21:11 UT" - 2019 RL4


MPEC 2019-S45 - "13:01 UT" - 2019 SP1


MPEC 2019-S44 - "12:58 UT" - 2019 SO1


MPEC 2019-S43 - "12:52 UT" - 2019 SN1


MPEC 2019-S42 - "12:42 UT" - 2019 SK1


MPEC 2019-S41 - "12:34 UT" - 2019 SJ1


MPEC 2019-S40 - "12:29 UT" - 2019 SH1


<< DOU on 22 September '19 >>  MPEC 2019-S39 - "12:11 UT" - Daily Orbit Update

Observers  on 22 September '19

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 2 in MPECs 2019-S41 & 2019-S42 -- 2019 SK1, 2019 SJ1
R57Aorangi Iti Obs., 7 in MPECs 2019-S39 & 2019-S40 -- 2019 ST, 2019 SH1, 2019 RC, 2019 QC4, 2019 QC1, 2012 HR69, 2009 SP
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2019-S41, 2019-S42 & 2019-S53 -- 2019 SV1, 2019 SK1, 2019 SJ1
I47Auger Obs. in Argentina, 1 in MPEC 2019-S40 -- 2019 SH1
U63Burnt Tree Hill Obs., 2 in MPEC 2019-S39 -- 2019 GT3, 237805
160Castelmartini Obs. in Italy, 15 in MPEC 2019-S39 -- 2019 PP1, 2010 VW75, 2008 SR1, 2002 SQ, 524603, 481985, 467475, 326742, 248926, 18172, 143527, 141593, 6455, 3102, 2100
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-S40 -- 2019 SH1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2019-S39, 2019-S45, 2019-S46, 2019-S48, 2019-S49, 2019-S50 & 2019-S51 -- 2019 ST1, 2019 SS1, 2019 SR1, 2019 SQ1, 2019 SP1, 2019 RL4, 2019 QK, 2019 NU, 2019 NB5, 2019 MW3
Z99Clixby Obs. in England, 1 in MPEC 2019-S42 -- 2019 SK1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-S40 -- 2019 SH1
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2019-S39 -- 2010 UH7
K87Dettelbach Vineyard Obs. in Germany, 15 in MPECs 2019-S39, 2019-S41, 2019-S42 & 2019-S43 -- 2019 SW, 2019 SN1, 2019 SK1, 2019 SJ1, 2019 SH, 2019 SC1, 2019 PE2, 2019 LE5, 2019 GT3, 2017 KP27, 2015 RZ35, 2014 XX7, 2010 VW75, 2007 TQ24, 90403
113Drebach Obs. in Germany, 1 in MPEC 2019-S41 -- 2019 SJ1
W46Foxfire Village Obs., 3 in MPEC 2019-S39 -- 90403, 492143, 401857
E89Geyserland Obs. in New Zealand, 2 in MPEC 2019-S39 -- 152942, 5786
K88GINOP-KHK in Hungary, 2 in MPECs 2019-S40 & 2019-S41 -- 2019 SJ1, 2019 SH1
J95Great Shefford Obs. in England, 1 in MPEC 2019-S43 -- 2019 SN1
A17Guidestar Obs. in Germany, 1 in MPEC 2019-S42 -- 2019 SK1
K85Kelmis Obs., 1 in MPEC 2019-S39 -- 237805
246KLENOT in the Czech Republic, 4 in MPECs 2019-S39 & 2019-S40 -- 2019 SH1, 2019 QC1, 2014 QQ266, 2013 CK89
Z43Landehen Obs., 4 in MPEC 2019-S39 -- 2019 SD, 2019 GT3, 326777, 237805
G96Mt. Lemmon Survey (MLS) in Arizona, 13 in MPECs 2019-S40, 2019-S41, 2019-S42, 2019-S43, 2019-S44, 2019-S45, 2019-S48, 2019-S49, 2019-S50, 2019-S52, 2019-S53, 2019-S54 & 2019-S55 -- 2019 SW1, 2019 SV1, 2019 SU1, 2019 SS1, 2019 SR1, 2019 SQ1, 2019 SP1, 2019 SO1, 2019 SN1, 2019 SK1, 2019 SJ1, 2019 SH1, 2019 SA2
C47Nonndorf Obs. in Austria, 2 in MPEC 2019-S39 -- 2017 KP27, 2014 QQ266
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-S39 -- 2059
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2019-S40, 2019-S46, 2019-S47 & 2019-S51 -- 2019 ST1, 2019 SH1, 2019 RL4, 2001 SX269
C95SATINO-1 in France, 1 in MPEC 2019-S39 -- 2019 PR2
691Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2019-S39 & 2019-S51 -- 2019 ST1, 2019 SD, 2019 RY, 2019 RP2, 2019 RO2, 2019 HC, 2019 FV2, 2014 MC55, 2005 RZ2, 2002 UZ30
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2019-S39 & 2019-S46 -- 2019 RL4, 2019 QV7, 2019 NZ1, 2016 SG1, 2015 RP82, 2015 RH2, 2014 ER49, 2010 TX168, 2010 AG79, 2005 RZ2
W34Squirrel Valley Obs. in North Carolina, 4 in MPECs 2019-S39, 2019-S41 & 2019-S42 -- 2019 SK1, 2019 SJ1, 2019 MK2, 2014 QQ266
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2019-S53 & 2019-S54 -- 2019 SW1, 2019 SV1
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2019-S39, 2019-S40, 2019-S41, 2019-S42, 2019-S43, 2019-S44, 2019-S45, 2019-S48, 2019-S49, 2019-S50, 2019-S52, 2019-S53 & 2019-S54 -- 2019 SW1, 2019 SV1, 2019 SU1, 2019 SS1, 2019 SR1, 2019 SQ1, 2019 SP1, 2019 SO1, 2019 SN1, 2019 SK1, 2019 SJ1, 2019 SH1, 2019 SH, 2019 SC1, 2019 RR1, 2019 QK4, 2019 JP2
A98Taurus-1 Obs. in Belarus, 1 in MPEC 2019-S39 -- 2019 GT3
A16Tentlingen Obs. in Switzerland, 2 in MPEC 2019-S39 -- 2019 GT3, 401857
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-S39 -- 2019 AA9
L01Visnjan Obs., 8 in MPECs 2019-S40, 2019-S41, 2019-S42, 2019-S43, 2019-S45, 2019-S48, 2019-S53 & 2019-S55 -- 2019 SV1, 2019 SQ1, 2019 SP1, 2019 SN1, 2019 SK1, 2019 SJ1, 2019 SH1, 2019 SA2
G33Wickede Obs. in Germany, 1 in MPEC 2019-S39 -- 1620
I41Zwicky Transient Facility (ZTF) in southern California, 11 in MPEC 2019-S39 -- 2019 QX, 2019 QW3, 2019 QC1, 2019 PP1, 2019 OQ4, 2006 MA, 2006 KE, 243025, 230118, 18172, 162273
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2356 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 SQ1JPL Sentry23572079-2117113.634656e-07-8.14-8.450JPL: Computed at 16:18 today Pacific time based on 14 observations spanning .82456 days (2019-Sep-20.28299 to 2019-Sep-21.10755). Diameter approximately 0.010 km. from weighted mean H=27.59.
2019 SDNEODyS17092080-211043.73e-05-4.80-4.80NEODyS: "Based on 99 optical observations (of which 1 are rejected as outliers) from 2019-09-17.241 to 2019-09-22.307."
JPL Sentry15212080-211030.000177544984-4.11-4.110JPL: Computed at 06:30 today Pacific time based on 99 observations spanning 5.0656 days (2019-Sep-17.240317 to 2019-Sep-22.30596). Diameter approximately 0.028 km. from weighted mean H=25.43.

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 22 September '19

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

2357Noted that JPL Sentry has posted 2019 SQ1 as an impact risk - see above
2356Grabbed MPEC 2019-S46 - 2019 RL4 - see above
Grabbed MPEC 2019-S47 - 2001 SX269 - see above
Grabbed MPEC 2019-S48 - 2019 SQ1 - see above
Grabbed MPEC 2019-S49 - 2019 SR1 - see above
Grabbed MPEC 2019-S50 - 2019 SS1 - see above
Grabbed MPEC 2019-S51 - 2019 ST1 - see above
Grabbed MPEC 2019-S52 - 2019 SU1 - see above
Grabbed MPEC 2019-S53 - 2019 SV1 - see above
Grabbed MPEC 2019-S54 - 2019 SW1 - see above
Grabbed MPEC 2019-S55 - 2019 SA2 - see above
1720Generated Traffic Report
1709Noted that NEODyS has updated its 2019 SD risk assessment - see above
1521Noted that JPL Sentry has updated its 2019 SD risk assessment - see above
Grabbed MPEC 2019-S39 - Daily Orbit Update - see above
Grabbed MPEC 2019-S40 - 2019 SH1 - see above
Grabbed MPEC 2019-S41 - 2019 SJ1 - see above
Grabbed MPEC 2019-S42 - 2019 SK1 - see above
Grabbed MPEC 2019-S43 - 2019 SN1 - see above
Grabbed MPEC 2019-S44 - 2019 SO1 - see above
Grabbed MPEC 2019-S45 - 2019 SP1 - see above